Change netdaemon to poll & work with libusefull_macros, add weatherdaemon

Daemons/netdaemon.deprecated/Makefile

@@ -0,0 +1,43 @@
+# run `make DEF=...` to add extra defines
+PROGRAM := netdaemon
+LDFLAGS := -fdata-sections -ffunction-sections -Wl,--gc-sections -Wl,--discard-all -pthread
+SRCS := $(wildcard *.c)
+DEFINES := $(DEF) -D_GNU_SOURCE -D_XOPEN_SOURCE=1111
+DEFINES += -DEBUG
+# baudrate for USB<->UART converter
+DEFINES += -DBAUD_RATE=B115200
+OBJDIR := mk
+CFLAGS += -O2 -Wall -Werror -Wextra -Wno-trampolines
+OBJS := $(addprefix $(OBJDIR)/, $(SRCS:%.c=%.o))
+DEPS := $(OBJS:.o=.d)
+CC = gcc
+
+all : $(OBJDIR) $(PROGRAM)
+
+$(PROGRAM) : $(OBJS)
+	@echo -e "\t\tLD $(PROGRAM)"
+	$(CC) $(LDFLAGS) $(OBJS) -o $(PROGRAM)
+
+$(OBJDIR):
+	mkdir $(OBJDIR)
+
+ifneq ($(MAKECMDGOALS),clean)
+-include $(DEPS)
+endif
+
+$(OBJDIR)/%.o: %.c
+	@echo -e "\t\tCC $<"
+	$(CC) -MD -c $(LDFLAGS) $(CFLAGS) $(DEFINES) -o $@ $<
+
+clean:
+	@echo -e "\t\tCLEAN"
+	@rm -f $(OBJS) $(DEPS)
+	@rmdir $(OBJDIR) 2>/dev/null || true
+
+xclean: clean
+	@rm -f $(PROGRAM)
+
+gentags:
+	CFLAGS="$(CFLAGS) $(DEFINES)" geany -g $(PROGRAM).c.tags *[hc] 2>/dev/null
+
+.PHONY: gentags clean xclean

Daemons/netdaemon.deprecated/Readme.md

@@ -0,0 +1,9 @@
+Network daemon snippet
+==================
+
+This isn't an end-product, but just a template for different net-daemons.
+
+Open a socket at given port (default: 4444), works with http & direct requests.
+Can read and send commands over serial interface.
+
+Pieces with user code marked as 'INSERT CODE HERE'.

Daemons/netdaemon.deprecated/cmdlnopts.c

@@ -0,0 +1,89 @@
+/*                                                                                                  geany_encoding=koi8-r
+ * cmdlnopts.c - the only function that parse cmdln args and returns glob parameters
+ *
+ * Copyright 2018 Edward V. Emelianoff <eddy@sao.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include <strings.h>
+#include <math.h>
+#include "cmdlnopts.h"
+#include "usefull_macros.h"
+
+/*
+ * here are global parameters initialisation
+ */
+int help;
+static glob_pars  G;
+
+// default values for Gdefault & help
+#define DEFAULT_PORT    "4444"
+
+//            DEFAULTS
+// default global parameters
+glob_pars const Gdefault = {
+    .device = NULL,
+    .port = DEFAULT_PORT,
+    .terminal = 0,
+    .echo = 0,
+    .logfile = NULL,
+    .rest_pars = NULL,
+    .rest_pars_num = 0
+};
+
+/*
+ * Define command line options by filling structure:
+ *  name        has_arg     flag    val     type        argptr              help
+*/
+myoption cmdlnopts[] = {
+// common options
+    {"help",    NO_ARGS,    NULL,   'h',    arg_int,    APTR(&help),        _("show this help")},
+    {"device",  NEED_ARG,   NULL,   'i',    arg_string, APTR(&G.device),    _("serial device name (default: none)")},
+    {"port",    NEED_ARG,   NULL,   'p',    arg_string, APTR(&G.port),      _("network port to connect (default: " DEFAULT_PORT ")")},
+    {"logfile", NEED_ARG,   NULL,   'l',    arg_string, APTR(&G.logfile),   _("save logs to file (default: none)")},
+    {"terminal",NO_ARGS,    NULL,   't',    arg_int,    APTR(&G.terminal),  _("run as terminal")},
+    {"echo",    NO_ARGS,    NULL,   'e',    arg_int,    APTR(&G.echo),      _("echo users commands back")},
+    end_option
+};
+
+/**
+ * Parse command line options and return dynamically allocated structure
+ *      to global parameters
+ * @param argc - copy of argc from main
+ * @param argv - copy of argv from main
+ * @return allocated structure with global parameters
+ */
+glob_pars *parse_args(int argc, char **argv){
+    int i;
+    void *ptr;
+    ptr = memcpy(&G, &Gdefault, sizeof(G)); assert(ptr);
+    // format of help: "Usage: progname [args]\n"
+    change_helpstring("Usage: %s [args]\n\n\tWhere args are:\n");
+    // parse arguments
+    parseargs(&argc, &argv, cmdlnopts);
+    if(help) showhelp(-1, cmdlnopts);
+    if(argc > 0){
+        G.rest_pars_num = argc;
+        G.rest_pars = calloc(argc, sizeof(char*));
+        for (i = 0; i < argc; i++)
+            G.rest_pars[i] = strdup(argv[i]);
+    }
+    return &G;
+}
+

Daemons/netdaemon.deprecated/cmdlnopts.h

@@ -0,0 +1,44 @@
+/*                                                                                                  geany_encoding=koi8-r
+ * cmdlnopts.h - comand line options for parceargs
+ *
+ * Copyright 2018 Edward V. Emelianoff <eddy@sao.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#pragma once
+#ifndef __CMDLNOPTS_H__
+#define __CMDLNOPTS_H__
+
+#include "parseargs.h"
+#include "term.h"
+
+/*
+ * here are some typedef's for global data
+ */
+typedef struct{
+    char *device;           // serial device name
+    char *port;             // port to connect
+    char *logfile;          // logfile name
+    int terminal;           // run as terminal
+    int echo;               // echo user commands back
+    int rest_pars_num;      // number of rest parameters
+    char** rest_pars;       // the rest parameters: array of char* (path to logfile and thrash)
+} glob_pars;
+
+
+glob_pars *parse_args(int argc, char **argv);
+#endif // __CMDLNOPTS_H__

Daemons/netdaemon.deprecated/main.c

@@ -0,0 +1,79 @@
+/*                                                                                                  geany_encoding=koi8-r
+ * main.c
+ *
+ * Copyright 2018 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+#include "usefull_macros.h"
+#include <signal.h>
+#include <sys/wait.h> // wait
+#include <sys/prctl.h> //prctl
+#include "cmdlnopts.h"
+#include "socket.h"
+
+glob_pars *GP;
+
+void signals(int signo){
+    restore_console();
+    restore_tty();
+    LOG("exit with status %d", signo);
+    exit(signo);
+}
+
+int main(int argc, char **argv){
+    initial_setup();
+    signal(SIGTERM, signals); // kill (-15) - quit
+    signal(SIGHUP, SIG_IGN);  // hup - ignore
+    signal(SIGINT, signals);  // ctrl+C - quit
+    signal(SIGQUIT, signals); // ctrl+\ - quit
+    signal(SIGTSTP, SIG_IGN); // ignore ctrl+Z
+    GP = parse_args(argc, argv);
+    if(GP->terminal){
+        if(!GP->device) ERRX(_("Point serial device name"));
+        try_connect(GP->device);
+        run_terminal();
+        signals(0); // never reached!
+    }
+    if(GP->logfile)
+        Cl_createlog(GP->logfile);
+    #ifndef EBUG
+    if(daemon(1, 0)){
+        ERR("daemon()");
+    }
+    while(1){ // guard for dead processes
+        pid_t childpid = fork();
+        if(childpid){
+            LOG("create child with PID %d\n", childpid);
+            DBG("Created child with PID %d\n", childpid);
+            wait(NULL);
+            WARNX("Child %d died\n", childpid);
+            sleep(1);
+        }else{
+            prctl(PR_SET_PDEATHSIG, SIGTERM); // send SIGTERM to child when parent dies
+            break; // go out to normal functional
+        }
+    }
+    #endif
+
+    if(GP->device) try_connect(GP->device);
+    /*
+     * INSERT CODE HERE
+     * connection check & device validation
+     */
+    daemonize(GP->port);
+    return 0;
+}

Daemons/netdaemon.deprecated/socket.c

@@ -0,0 +1,307 @@
+/*
+ *                                                                                                  geany_encoding=koi8-r
+ * socket.c - socket IO
+ *
+ * Copyright 2018 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ *
+ */
+#include "usefull_macros.h"
+#include "socket.h"
+#include "term.h"
+#include <netdb.h>      // addrinfo
+#include <arpa/inet.h>  // inet_ntop
+#include <limits.h>     // INT_xxx
+#include <signal.h> // pthread_kill
+#include <unistd.h> // daemon
+#include <sys/syscall.h> // syscall
+
+#include "cmdlnopts.h"   // glob_pars
+
+#define BUFLEN    (10240)
+// Max amount of connections
+#define BACKLOG   (30)
+
+extern glob_pars *GP;
+
+/*
+ * Define global data buffers here
+ */
+
+/**************** COMMON FUNCTIONS ****************/
+/**
+ * wait for answer from socket
+ * @param sock - socket fd
+ * @return 0 in case of error or timeout, 1 in case of socket ready
+ */
+static int waittoread(int sock){
+    fd_set fds;
+    struct timeval timeout;
+    int rc;
+    timeout.tv_sec = 1; // wait not more than 1 second
+    timeout.tv_usec = 0;
+    FD_ZERO(&fds);
+    FD_SET(sock, &fds);
+    do{
+        rc = select(sock+1, &fds, NULL, NULL, &timeout);
+        if(rc < 0){
+            if(errno != EINTR){
+                WARN("select()");
+                return 0;
+            }
+            continue;
+        }
+        break;
+    }while(1);
+    if(FD_ISSET(sock, &fds)) return 1;
+    return 0;
+}
+
+/**************** SERVER FUNCTIONS ****************/
+static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+/**
+ * Send data over socket
+ * @param sock      - socket fd
+ * @param webquery  - ==1 if this is web query
+ * @param textbuf   - zero-trailing buffer with data to send
+ * @return 1 if all OK
+ */
+static int send_data(int sock, int webquery, char *textbuf){
+    ssize_t L, Len;
+    char tbuf[BUFLEN];
+    Len = strlen(textbuf);
+    // OK buffer ready, prepare to send it
+    if(webquery){
+        L = snprintf((char*)tbuf, BUFLEN,
+            "HTTP/2.0 200 OK\r\n"
+            "Access-Control-Allow-Origin: *\r\n"
+            "Access-Control-Allow-Methods: GET, POST\r\n"
+            "Access-Control-Allow-Credentials: true\r\n"
+            "Content-type: text/plain\r\nContent-Length: %zd\r\n\r\n", Len);
+        if(L < 0){
+            WARN("sprintf()");
+            return 0;
+        }
+        if(L != write(sock, tbuf, L)){
+            WARN("write");
+            return 0;
+        }
+    }
+    // send data
+    //DBG("send %zd bytes\nBUF: %s", Len, buf);
+    if(Len != write(sock, textbuf, Len)){
+        WARN("write()");
+        return 0;
+    }
+    return 1;
+}
+
+// search a first word after needle without spaces
+static char* stringscan(char *str, char *needle){
+    char *a, *e;
+    char *end = str + strlen(str);
+    a = strstr(str, needle);
+    if(!a) return NULL;
+    a += strlen(needle);
+    while (a < end && (*a == ' ' || *a == '\r' || *a == '\t' || *a == '\r')) a++;
+    if(a >= end) return NULL;
+    e = strchr(a, ' ');
+    if(e) *e = 0;
+    return a;
+}
+
+static void *handle_socket(void *asock){
+    //LOG("handle_socket(): getpid: %d, pthread_self: %lu, tid: %lu",getpid(), pthread_self(), syscall(SYS_gettid));
+    FNAME();
+    int sock = *((int*)asock);
+    int webquery = 0; // whether query is web or regular
+    char buff[BUFLEN];
+    ssize_t rd;
+    double t0 = dtime();
+    /*
+     * INSERT CODE HERE
+     * change to while(1) if socket shouldn't be closed after data transmission
+     */
+    while(dtime() - t0 < SOCKET_TIMEOUT){
+        if(!waittoread(sock)){ // no data incoming
+            continue;
+        }
+        if(!(rd = read(sock, buff, BUFLEN-1))){
+            //LOG("socket closed. Exit");
+            break;
+        }
+        //LOG("client send %zd bytes", rd);
+        DBG("Got %zd bytes", rd);
+        if(rd < 0){ // error
+            //LOG("some error occured");
+            DBG("Nothing to read from fd %d (ret: %zd)", sock, rd);
+            break;
+        }
+        // add trailing zero to be on the safe side
+        buff[rd] = 0;
+        // now we should check what do user want
+        char *got, *found = buff;
+        if((got = stringscan(buff, "GET")) || (got = stringscan(buff, "POST"))){ // web query
+            webquery = 1;
+            char *slash = strchr(got, '/');
+            if(slash) found = slash + 1;
+            // web query have format GET /some.resource
+        }
+        // here we can process user data
+        DBG("user send: %s\nfound=%s", buff, found);
+        if(GP->echo){
+            if(!send_data(sock, webquery, found)){
+                LOG("can't send data, some error occured");
+            }
+        }
+        pthread_mutex_lock(&mutex);
+        /*
+         * INSERT CODE HERE
+         * Process user commands here & send him an answer
+         * remove trailing break if socket shouldn't be closed after server sent data
+         */
+        pthread_mutex_unlock(&mutex);
+        break;
+    }
+    close(sock);
+    //DBG("closed");
+    //LOG("socket closed, exit");
+    pthread_exit(NULL);
+    return NULL;
+}
+
+// main socket server
+static void *server(void *asock){
+    LOG("server(): getpid: %d, pthread_self: %lu, tid: %lu",getpid(), pthread_self(), syscall(SYS_gettid));
+    int sock = *((int*)asock);
+    if(listen(sock, BACKLOG) == -1){
+        LOG("listen() failed");
+        WARN("listen");
+        return NULL;
+    }
+    while(1){
+        socklen_t size = sizeof(struct sockaddr_in);
+        struct sockaddr_in their_addr;
+        int newsock;
+        if(!waittoread(sock)) continue;
+        newsock = accept(sock, (struct sockaddr*)&their_addr, &size);
+        if(newsock <= 0){
+            LOG("accept() failed");
+            WARN("accept()");
+            continue;
+        }
+        struct sockaddr_in* pV4Addr = (struct sockaddr_in*)&their_addr;
+        struct in_addr ipAddr = pV4Addr->sin_addr;
+        char str[INET_ADDRSTRLEN];
+        inet_ntop(AF_INET, &ipAddr, str, INET_ADDRSTRLEN);
+        //LOG("get connection from %s", str);
+        DBG("Got connection from %s\n", str);
+        pthread_t handler_thread;
+        if(pthread_create(&handler_thread, NULL, handle_socket, (void*) &newsock)){
+            LOG("server(): pthread_create() failed");
+            WARN("pthread_create()");
+        }else{
+            DBG("Thread created, detouch");
+            pthread_detach(handler_thread); // don't care about thread state
+        }
+    }
+    LOG("server(): UNREACHABLE CODE REACHED!");
+}
+
+// data gathering & socket management
+static void daemon_(int sock){
+    if(sock < 0) return;
+    pthread_t sock_thread;
+    if(pthread_create(&sock_thread, NULL, server, (void*) &sock)){
+        LOG("daemon_(): pthread_create() failed");
+        ERR("pthread_create()");
+    }
+    double tgot = 0.;
+    do{
+        if(pthread_kill(sock_thread, 0) == ESRCH){ // died
+            WARNX("Sockets thread died");
+            LOG("Sockets thread died");
+            pthread_join(sock_thread, NULL);
+            if(pthread_create(&sock_thread, NULL, server, (void*) &sock)){
+                LOG("daemon_(): new pthread_create() failed");
+                ERR("pthread_create()");
+            }
+        }
+        usleep(1000); // sleep a little or thread's won't be able to lock mutex
+        if(dtime() - tgot < T_INTERVAL) continue;
+        tgot = dtime();
+        /*
+         * INSERT CODE HERE
+         * Gather data (poll_device)
+         */
+        // copy temporary buffers to main
+        pthread_mutex_lock(&mutex);
+        /*
+         * INSERT CODE HERE
+         * fill global data buffers
+         */
+        pthread_mutex_unlock(&mutex);
+    }while(1);
+    LOG("daemon_(): UNREACHABLE CODE REACHED!");
+}
+
+/**
+ * Run daemon service
+ */
+void daemonize(char *port){
+    FNAME();
+    int sock = -1;
+    struct addrinfo hints, *res, *p;
+    memset(&hints, 0, sizeof(hints));
+    hints.ai_family = AF_INET;
+    hints.ai_socktype = SOCK_STREAM;
+    hints.ai_flags = AI_PASSIVE;
+    if(getaddrinfo(NULL, port, &hints, &res) != 0){
+        ERR("getaddrinfo");
+    }
+    struct sockaddr_in *ia = (struct sockaddr_in*)res->ai_addr;
+    char str[INET_ADDRSTRLEN];
+    inet_ntop(AF_INET, &(ia->sin_addr), str, INET_ADDRSTRLEN);
+    // loop through all the results and bind to the first we can
+    for(p = res; p != NULL; p = p->ai_next){
+        if((sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1){
+            WARN("socket");
+            continue;
+        }
+        int reuseaddr = 1;
+        if(setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &reuseaddr, sizeof(int)) == -1){
+            ERR("setsockopt");
+        }
+        if(bind(sock, p->ai_addr, p->ai_addrlen) == -1){
+            close(sock);
+            WARN("bind");
+            continue;
+        }
+        break; // if we get here, we have a successfull connection
+    }
+    if(p == NULL){
+        LOG("failed to bind socket, exit");
+        // looped off the end of the list with no successful bind
+        ERRX("failed to bind socket");
+    }
+    freeaddrinfo(res);
+    daemon_(sock);
+    close(sock);
+    LOG("socket closed, exit");
+    signals(0);
+}
+

Daemons/netdaemon.deprecated/socket.h

@@ -0,0 +1,34 @@
+/*
+ *                                                                                                  geany_encoding=koi8-r
+ * socket.h
+ *
+ * Copyright 2017 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ *
+ */
+#pragma once
+#ifndef __SOCKET_H__
+#define __SOCKET_H__
+
+// timeout for socket closing
+#define SOCKET_TIMEOUT  (5.0)
+// time interval for data polling (seconds)
+#define T_INTERVAL      (10.)
+
+void daemonize(char *port);
+
+#endif // __SOCKET_H__

Daemons/netdaemon.deprecated/term.c

@@ -0,0 +1,118 @@
+/*                                                                                                  geany_encoding=koi8-r
+ * client.c - terminal parser
+ *
+ * Copyright 2018 Edward V. Emelianoff <eddy@sao.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+#include "usefull_macros.h"
+#include "term.h"
+#include <strings.h> // strncasecmp
+#include <time.h>    // time(NULL)
+#include <limits.h>  // INT_MAX, INT_MIN
+
+#define BUFLEN 1024
+
+static char buf[BUFLEN];
+
+/**
+ * read strings from terminal (ending with '\n') with timeout
+ * @return NULL if nothing was read or pointer to static buffer
+ */
+static char *read_string(){
+    size_t r = 0, l;
+    int LL = BUFLEN - 1;
+    char *ptr = NULL;
+    static char *optr = NULL;
+    if(optr && *optr){
+        ptr = optr;
+        optr = strchr(optr, '\n');
+        if(optr) ++optr;
+        //DBG("got data, roll to next; ptr=%s\noptr=%s",ptr,optr);
+        return ptr;
+    }
+    ptr = buf;
+    double d0 = dtime();
+    do{
+        if((l = read_tty(ptr, LL))){
+            r += l; LL -= l; ptr += l;
+            if(ptr[-1] == '\n') break;
+            d0 = dtime();
+        }
+    }while(dtime() - d0 < WAIT_TMOUT && LL);
+    if(r){
+        buf[r] = 0;
+        //DBG("r=%zd, got string: %s", r, buf);
+        optr = strchr(buf, '\n');
+        if(optr) ++optr;
+        return buf;
+    }
+    return NULL;
+}
+
+/**
+ * Try to connect to `device` at BAUD_RATE speed
+ * @return connection speed if success or 0
+ */
+void try_connect(char *device){
+    if(!device) return;
+    char tmpbuf[4096];
+    fflush(stdout);
+    tty_init(device);
+    while(read_tty(tmpbuf, 4096)); // clear rbuf
+    LOG("Connected to %s", device);
+}
+
+/**
+ * run terminal emulation: send user's commands and show answers
+ */
+void run_terminal(){
+    green(_("Work in terminal mode without echo\n"));
+    int rb;
+    char buf[BUFLEN];
+    size_t l;
+    setup_con();
+    while(1){
+        if((l = read_tty(buf, BUFLEN - 1))){
+            buf[l] = 0;
+            printf("%s", buf);
+        }
+        if((rb = read_console())){
+            buf[0] = (char) rb;
+            write_tty(buf, 1);
+        }
+    }
+}
+
+/**
+ * Poll serial port for new dataportion
+ * @return: NULL if no data received, pointer to string if valid data received
+ */
+char *poll_device(){
+    char *ans;
+    double t0 = dtime();
+    while(dtime() - t0 < T_POLLING_TMOUT){
+        if((ans = read_string())){ // parse new data
+            DBG("got %s", ans);
+            /*
+             * INSERT CODE HERE
+             * (data validation)
+             */
+            return ans;
+        }
+    }
+    return NULL;
+}

Daemons/netdaemon.deprecated/term.h

@@ -0,0 +1,36 @@
+/*                                                                                                  geany_encoding=koi8-r
+ * term.h
+ *
+ * Copyright 2018 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+#pragma once
+#ifndef __TERM_H__
+#define __TERM_H__
+
+#define FRAME_MAX_LENGTH        (300)
+#define MAX_MEMORY_DUMP_SIZE    (0x800 * 4)
+// Terminal timeout (seconds)
+#define     WAIT_TMOUT          (0.5)
+// Terminal polling timeout - 1 second
+#define     T_POLLING_TMOUT     (1.0)
+
+void run_terminal();
+void try_connect(char *device);
+char *poll_device();
+
+#endif // __TERM_H__

Daemons/netdaemon/Makefile

@@ -1,11 +1,11 @@
 # run `make DEF=...` to add extra defines
 PROGRAM := netdaemon
 LDFLAGS := -fdata-sections -ffunction-sections -Wl,--gc-sections -Wl,--discard-all -pthread
+LDFLAGS += -lusefull_macros
 SRCS := $(wildcard *.c)
 DEFINES := $(DEF) -D_GNU_SOURCE -D_XOPEN_SOURCE=1111
 DEFINES += -DEBUG
 # baudrate for USB<->UART converter
-DEFINES += -DBAUD_RATE=B115200
 OBJDIR := mk
 CFLAGS += -O2 -Wall -Werror -Wextra -Wno-trampolines
 OBJS := $(addprefix $(OBJDIR)/, $(SRCS:%.c=%.o))

Daemons/netdaemon/Readme.md

@@ -1,9 +1,21 @@
 Network daemon snippet
 ==================
 
-This isn't an end-product, but just a template for different net-daemons.
-
 Open a socket at given port (default: 4444), works with http & direct requests.
 Can read and send commands over serial interface.
 
 Pieces with user code marked as 'INSERT CODE HERE'.
+
+
+Usage: netdaemon [args]
+
+        Where args are:
+
+  -b, --baudrate=arg   serial terminal baudrate (default: 115200)
+  -e, --echo           echo users commands back
+  -h, --help           show this help
+  -i, --device=arg     serial device name (default: none)
+  -l, --logfile=arg    save logs to file (default: none)
+  -p, --port=arg       network port to connect (default: 4444)
+  -t, --terminal       run as terminal
+  -v, --verb           logfile verbocity level (each -v increase it)

Daemons/netdaemon/cmdlnopts.c

@@ -23,8 +23,9 @@
 #include <string.h>
 #include <strings.h>
 #include <math.h>
+#include <usefull_macros.h>
 #include "cmdlnopts.h"
-#include "usefull_macros.h"
+#include "term.h"
 
 /*
  * here are global parameters initialisation
@@ -43,6 +44,8 @@ glob_pars const Gdefault = {
     .terminal = 0,
     .echo = 0,
     .logfile = NULL,
+    .verb = 0,
+    .tty_speed = 115200,
     .rest_pars = NULL,
     .rest_pars_num = 0
 };
@@ -59,6 +62,8 @@ myoption cmdlnopts[] = {
     {"logfile", NEED_ARG,   NULL,   'l',    arg_string, APTR(&G.logfile),   _("save logs to file (default: none)")},
     {"terminal",NO_ARGS,    NULL,   't',    arg_int,    APTR(&G.terminal),  _("run as terminal")},
     {"echo",    NO_ARGS,    NULL,   'e',    arg_int,    APTR(&G.echo),      _("echo users commands back")},
+    {"verb",    NO_ARGS,    NULL,   'v',    arg_none,   APTR(&G.verb),      _("logfile verbocity level (each -v increase it)")},
+    {"baudrate",NEED_ARG,   NULL,   'b',    arg_int,    APTR(&G.tty_speed), _("serial terminal baudrate (default: 115200)")},
     end_option
 };
 

Daemons/netdaemon/cmdlnopts.h

@@ -23,9 +23,6 @@
 #ifndef __CMDLNOPTS_H__
 #define __CMDLNOPTS_H__
 
-#include "parseargs.h"
-#include "term.h"
-
 /*
  * here are some typedef's for global data
  */
@@ -35,6 +32,8 @@ typedef struct{
     char *logfile;          // logfile name
     int terminal;           // run as terminal
     int echo;               // echo user commands back
+    int verb;               // verbocity level
+    int tty_speed;          // serial terminal baudrate
     int rest_pars_num;      // number of rest parameters
     char** rest_pars;       // the rest parameters: array of char* (path to logfile and thrash)
 } glob_pars;

Daemons/netdaemon/main.c

@@ -18,19 +18,21 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  * MA 02110-1301, USA.
  */
-#include "usefull_macros.h"
 #include <signal.h>
+#include <stdio.h>
 #include <sys/wait.h> // wait
 #include <sys/prctl.h> //prctl
+#include <usefull_macros.h>
 #include "cmdlnopts.h"
 #include "socket.h"
+#include "term.h"
 
 glob_pars *GP;
 
 void signals(int signo){
     restore_console();
-    restore_tty();
-    LOG("exit with status %d", signo);
+    if(ttydescr) close_tty(&ttydescr);
+    LOGERR("exit with status %d", signo);
     exit(signo);
 }
 
@@ -44,12 +46,18 @@ int main(int argc, char **argv){
     GP = parse_args(argc, argv);
     if(GP->terminal){
         if(!GP->device) ERRX(_("Point serial device name"));
-        try_connect(GP->device);
+        if(!try_connect(GP->device, GP->tty_speed))
+            ERRX("Can't connect to device");
         run_terminal();
         signals(0); // never reached!
     }
-    if(GP->logfile)
-        Cl_createlog(GP->logfile);
+    if(GP->logfile){
+        sl_loglevel lvl = LOGLEVEL_ERR;
+        for(; GP->verb && lvl < LOGLEVEL_ANY; --GP->verb) ++lvl;
+        DBG("Loglevel: %d", lvl);
+        if(!OPENLOG(GP->logfile, lvl, 1)) ERRX("Can't open log file");
+        LOGERR("Started");
+    }
     #ifndef EBUG
     if(daemon(1, 0)){
         ERR("daemon()");
@@ -57,10 +65,11 @@ int main(int argc, char **argv){
     while(1){ // guard for dead processes
         pid_t childpid = fork();
         if(childpid){
-            LOG("create child with PID %d\n", childpid);
+            LOGDBG("create child with PID %d\n", childpid);
             DBG("Created child with PID %d\n", childpid);
             wait(NULL);
             WARNX("Child %d died\n", childpid);
+            LOGWARN("Child %d died\n", childpid);
             sleep(1);
         }else{
             prctl(PR_SET_PDEATHSIG, SIGTERM); // send SIGTERM to child when parent dies
@@ -69,7 +78,8 @@ int main(int argc, char **argv){
     }
     #endif
 
-    if(GP->device) try_connect(GP->device);
+    if(GP->device) if(!try_connect(GP->device, GP->tty_speed))
+        ERRX("Can't connect to device");;
     /*
      * INSERT CODE HERE
      * connection check & device validation

Daemons/netdaemon/socket.c

@@ -20,19 +20,24 @@
  * MA 02110-1301, USA.
  *
  */
-#include "usefull_macros.h"
-#include "socket.h"
-#include "term.h"
 #include <netdb.h>      // addrinfo
 #include <arpa/inet.h>  // inet_ntop
 #include <limits.h>     // INT_xxx
+#include <poll.h>       // poll
+#include <pthread.h>
 #include <signal.h>     // pthread_kill
-#include <unistd.h> // daemon
+#include <stdio.h>
+#include <string.h>
 #include <sys/syscall.h> // syscall
+#include <unistd.h>     // daemon
+#include <usefull_macros.h>
 
 #include "cmdlnopts.h"   // glob_pars
+#include "socket.h"
+#include "term.h"
 
-#define BUFLEN    (10240)
+// temporary buffers
+#define BUFLEN    (1024)
 // Max amount of connections
 #define BACKLOG   (30)
 
@@ -42,37 +47,7 @@ extern glob_pars *GP;
  * Define global data buffers here
  */
 
-/**************** COMMON FUNCTIONS ****************/
-/**
- * wait for answer from socket
- * @param sock - socket fd
- * @return 0 in case of error or timeout, 1 in case of socket ready
- */
-static int waittoread(int sock){
-    fd_set fds;
-    struct timeval timeout;
-    int rc;
-    timeout.tv_sec = 1; // wait not more than 1 second
-    timeout.tv_usec = 0;
-    FD_ZERO(&fds);
-    FD_SET(sock, &fds);
-    do{
-        rc = select(sock+1, &fds, NULL, NULL, &timeout);
-        if(rc < 0){
-            if(errno != EINTR){
-                WARN("select()");
-                return 0;
-            }
-            continue;
-        }
-        break;
-    }while(1);
-    if(FD_ISSET(sock, &fds)) return 1;
-    return 0;
-}
-
 /**************** SERVER FUNCTIONS ****************/
-static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
 /**
  * Send data over socket
  * @param sock      - socket fd
@@ -94,9 +69,11 @@ static int send_data(int sock, int webquery, char *textbuf){
             "Content-type: text/plain\r\nContent-Length: %zd\r\n\r\n", Len);
         if(L < 0){
             WARN("sprintf()");
+            LOGWARN("sprintf()");
             return 0;
         }
         if(L != write(sock, tbuf, L)){
+            LOGWARN("Can't write header");
             WARN("write");
             return 0;
         }
@@ -105,121 +82,162 @@ static int send_data(int sock, int webquery, char *textbuf){
     //DBG("send %zd bytes\nBUF: %s", Len, buf);
     if(Len != write(sock, textbuf, Len)){
         WARN("write()");
+        LOGERR("send_data(): write() failed");
         return 0;
     }
+    LOGDBG("fd %d, write %s", textbuf);
     return 1;
 }
 
 // search a first word after needle without spaces
 static char* stringscan(char *str, char *needle){
-    char *a, *e;
+    char *a;//, *e;
     char *end = str + strlen(str);
     a = strstr(str, needle);
     if(!a) return NULL;
     a += strlen(needle);
     while (a < end && (*a == ' ' || *a == '\r' || *a == '\t' || *a == '\r')) a++;
     if(a >= end) return NULL;
-    e = strchr(a, ' ');
-    if(e) *e = 0;
     return a;
 }
 
-static void *handle_socket(void *asock){
-    //LOG("handle_socket(): getpid: %d, pthread_self: %lu, tid: %lu",getpid(), pthread_self(), syscall(SYS_gettid));
+/**
+ * @brief handle_socket - read information from socket
+ * @param sock - socket fd
+ * @param chkheader - ==1 on first run
+ * @return 1 if socket closed
+ */
+static int handle_socket(int sock, int notchkhdr){
     FNAME();
-    int sock = *((int*)asock);
     int webquery = 0; // whether query is web or regular
     char buff[BUFLEN];
     ssize_t rd;
-    double t0 = dtime();
-    /*
-     * INSERT CODE HERE
-     * change to while(1) if socket shouldn't be closed after data transmission
-     */
-    while(dtime() - t0 < SOCKET_TIMEOUT){
-        if(!waittoread(sock)){ // no data incoming
-            continue;
-        }
     if(!(rd = read(sock, buff, BUFLEN-1))){
-            //LOG("socket closed. Exit");
-            break;
+        LOGMSG("Client %d closed", sock);
+        return 1;
     }
     //LOG("client send %zd bytes", rd);
     DBG("Got %zd bytes", rd);
     if(rd < 0){ // error
-            //LOG("some error occured");
+        LOGWARN("Client %d close socket on error", sock);
         DBG("Nothing to read from fd %d (ret: %zd)", sock, rd);
-            break;
+        return 1;
     }
     // add trailing zero to be on the safe side
     buff[rd] = 0;
     // now we should check what do user want
-        char *got, *found = buff;
-        if((got = stringscan(buff, "GET")) || (got = stringscan(buff, "POST"))){ // web query
+    char *found = buff;
+    DBG("user send: %s", buff);
+    if(!notchkhdr){
+        if(0 == strncmp(buff, "GET", 3)){
+            DBG("GET");
+            // GET web query have format GET /some.resource
             webquery = 1;
-            char *slash = strchr(got, '/');
-            if(slash) found = slash + 1;
-            // web query have format GET /some.resource
+            char *slash = strchr(buff, '/');
+            if(slash){
+                found = slash + 1;
+                char *eol = strstr(found, "HTTP");
+                if(eol) *eol = 0;
+            }
+        }else if(0 == strncmp(buff, "POST", 4)){
+            DBG("POST");
+            webquery = 1;
+            // search content length of POST query
+            char *cl = stringscan(buff, "Content-Length:");
+            if(cl){
+                int contlen = atoi(cl);
+                int l = strlen(buff);
+                if(contlen && l > contlen)  found = &buff[l - contlen];
+            }
+        }
     }
     // here we can process user data
-        DBG("user send: %s\nfound=%s", buff, found);
+    DBG("found=%s", found);
+    LOGDBG("sockfd=%d, got %s", sock, buff);
     if(GP->echo){
         if(!send_data(sock, webquery, found)){
-                LOG("can't send data, some error occured");
+            LOGWARN("Can't send data, some error occured");
+            return 1;
         }
     }
-        pthread_mutex_lock(&mutex);
     /*
+    *
      * INSERT CODE HERE
      * Process user commands here & send him an answer
      * remove trailing break if socket shouldn't be closed after server sent data
+     *
     */
-        pthread_mutex_unlock(&mutex);
-        break;
-    }
-    close(sock);
-    //DBG("closed");
-    //LOG("socket closed, exit");
-    pthread_exit(NULL);
-    return NULL;
+    if(webquery) return 1; // close web query after message processing
+    return 0;
 }
 
 // main socket server
 static void *server(void *asock){
-    LOG("server(): getpid: %d, pthread_self: %lu, tid: %lu",getpid(), pthread_self(), syscall(SYS_gettid));
+    LOGMSG("server()");
     int sock = *((int*)asock);
     if(listen(sock, BACKLOG) == -1){
-        LOG("listen() failed");
+        LOGERR("listen() failed");
         WARN("listen");
         return NULL;
     }
+    int nfd = 1; // current fd amount in poll_set
+    struct pollfd poll_set[MAX_FDS];
+    int notchkhdr[MAX_FDS];
+    memset(poll_set, 0, sizeof(poll_set));
+    memset(notchkhdr, 0, sizeof(notchkhdr));
+    poll_set[0].fd = sock;
+    poll_set[0].events = POLLIN;
     while(1){
+        poll(poll_set, nfd, 1); // poll for 1ms
+        for(int fdidx = 0; fdidx < nfd; ++fdidx){ // poll opened FDs
+            if((poll_set[fdidx].revents & POLLIN) == 0) continue;
+            poll_set[fdidx].revents = 0;
+            if(fdidx){ // client
+                int fd = poll_set[fdidx].fd;
+                if(handle_socket(fd, notchkhdr[fdidx])){ // socket closed - remove it from list
+                    close(fd);
+                    DBG("Client with fd %d closed", fd);
+                    LOGMSG("Client %d disconnected", fd);
+                    // move last to free space
+                    poll_set[fdidx] = poll_set[nfd - 1];
+                    notchkhdr[fdidx] = notchkhdr[nfd - 1];
+                    --nfd;
+                }else notchkhdr[fdidx] = 1;
+            }else{ // server
                 socklen_t size = sizeof(struct sockaddr_in);
                 struct sockaddr_in their_addr;
-        int newsock;
-        if(!waittoread(sock)) continue;
-        newsock = accept(sock, (struct sockaddr*)&their_addr, &size);
+                int newsock = accept(sock, (struct sockaddr*)&their_addr, &size);
                 if(newsock <= 0){
-            LOG("accept() failed");
+                    LOGERR("server(): accept() failed");
                     WARN("accept()");
                     continue;
                 }
-        struct sockaddr_in* pV4Addr = (struct sockaddr_in*)&their_addr;
-        struct in_addr ipAddr = pV4Addr->sin_addr;
+                struct in_addr ipAddr = their_addr.sin_addr;
                 char str[INET_ADDRSTRLEN];
                 inet_ntop(AF_INET, &ipAddr, str, INET_ADDRSTRLEN);
-        //LOG("get connection from %s", str);
-        DBG("Got connection from %s\n", str);
-        pthread_t handler_thread;
-        if(pthread_create(&handler_thread, NULL, handle_socket, (void*) &newsock)){
-            LOG("server(): pthread_create() failed");
-            WARN("pthread_create()");
+                DBG("Connection from %s, give fd=%d", str, newsock);
+                LOGMSG("Got connection from %s, fd=%d", str, newsock);
+                if(nfd == MAX_FDS){
+                    LOGWARN("Max amount of connections: disconnect %s (%d)", str, newsock);
+                    send_data(newsock, 0, "Max amount of connections reached!\n");
+                    WARNX("Limit of connections reached");
+                    close(newsock);
                 }else{
-            DBG("Thread created, detouch");
-            pthread_detach(handler_thread); // don't care about thread state
+                    memset(&poll_set[nfd], 0, sizeof(struct pollfd));
+                    poll_set[nfd].fd = newsock;
+                    poll_set[nfd].events = POLLIN;
+                    notchkhdr[nfd] = 0;
+                    ++nfd;
                 }
+
             }
-    LOG("server(): UNREACHABLE CODE REACHED!");
+        } // endfor
+        /*
+         * INSERT CODE HERE
+         * Send broadcast messages
+         */
+    }
+    LOGERR("server(): UNREACHABLE CODE REACHED!");
 }
 
 // data gathering & socket management
@@ -227,36 +245,26 @@ static void daemon_(int sock){
     if(sock < 0) return;
     pthread_t sock_thread;
     if(pthread_create(&sock_thread, NULL, server, (void*) &sock)){
-        LOG("daemon_(): pthread_create() failed");
+        LOGERR("daemon_(): pthread_create() failed");
         ERR("pthread_create()");
     }
-    double tgot = 0.;
     do{
         if(pthread_kill(sock_thread, 0) == ESRCH){ // died
             WARNX("Sockets thread died");
-            LOG("Sockets thread died");
+            LOGWARN("Sockets thread died");
             pthread_join(sock_thread, NULL);
             if(pthread_create(&sock_thread, NULL, server, (void*) &sock)){
-                LOG("daemon_(): new pthread_create() failed");
+                LOGERR("daemon_(): new pthread_create() failed");
                 ERR("pthread_create()");
             }
         }
-        usleep(1000); // sleep a little or thread's won't be able to lock mutex
-        if(dtime() - tgot < T_INTERVAL) continue;
-        tgot = dtime();
+        usleep(1000); // sleep a little
         /*
          * INSERT CODE HERE
          * Gather data (poll_device)
          */
-        // copy temporary buffers to main
-        pthread_mutex_lock(&mutex);
-        /*
-         * INSERT CODE HERE
-         * fill global data buffers
-         */
-        pthread_mutex_unlock(&mutex);
     }while(1);
-    LOG("daemon_(): UNREACHABLE CODE REACHED!");
+    LOGERR("daemon_(): UNREACHABLE CODE REACHED!");
 }
 
 /**
@@ -270,7 +278,9 @@ void daemonize(char *port){
     hints.ai_family = AF_INET;
     hints.ai_socktype = SOCK_STREAM;
     hints.ai_flags = AI_PASSIVE;
+    // To accept only local sockets replace NULL with "127.0.0.1" and remove AI_PASSIVE
     if(getaddrinfo(NULL, port, &hints, &res) != 0){
+        LOGERR("getaddrinfo");
         ERR("getaddrinfo");
     }
     struct sockaddr_in *ia = (struct sockaddr_in*)res->ai_addr;
@@ -284,24 +294,26 @@ void daemonize(char *port){
         }
         int reuseaddr = 1;
         if(setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &reuseaddr, sizeof(int)) == -1){
+            LOGERR("setsockopt() error");
             ERR("setsockopt");
         }
         if(bind(sock, p->ai_addr, p->ai_addrlen) == -1){
             close(sock);
             WARN("bind");
+            LOGWARN("bind() error");
             continue;
         }
         break; // if we get here, we have a successfull connection
     }
     if(p == NULL){
-        LOG("failed to bind socket, exit");
+        LOGERR("daemonize(): failed to bind socket, exit");
         // looped off the end of the list with no successful bind
         ERRX("failed to bind socket");
     }
     freeaddrinfo(res);
     daemon_(sock);
     close(sock);
-    LOG("socket closed, exit");
+    LOGERR("daemonize(): UNREACHABLE CODE REACHED!");
     signals(0);
 }
 

Daemons/netdaemon/socket.h

@@ -24,10 +24,10 @@
 #ifndef __SOCKET_H__
 #define __SOCKET_H__
 
-// timeout for socket closing
-#define SOCKET_TIMEOUT  (5.0)
 // time interval for data polling (seconds)
 #define T_INTERVAL      (10.)
+// max amount of opened fd (+1 for server socket)
+#define MAX_FDS (11)
 
 void daemonize(char *port);
 

Daemons/netdaemon/term.c

@@ -18,14 +18,18 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  * MA 02110-1301, USA.
  */
-#include "usefull_macros.h"
-#include "term.h"
+
+#include <stdio.h>
+#include <string.h>
 #include <strings.h> // strncasecmp
 #include <time.h>    // time(NULL)
 #include <limits.h>  // INT_MAX, INT_MIN
+#include "term.h"
 
 #define BUFLEN 1024
 
+TTY_descr *ttydescr = NULL;
+
 static char buf[BUFLEN];
 
 /**
@@ -33,6 +37,7 @@ static char buf[BUFLEN];
  * @return NULL if nothing was read or pointer to static buffer
  */
 static char *read_string(){
+    if(!ttydescr) ERRX("Serial device not initialized");
     size_t r = 0, l;
     int LL = BUFLEN - 1;
     char *ptr = NULL;
@@ -47,7 +52,7 @@ static char *read_string(){
     ptr = buf;
     double d0 = dtime();
     do{
-        if((l = read_tty(ptr, LL))){
+        if((l = read_tty(ttydescr))){
             r += l; LL -= l; ptr += l;
             if(ptr[-1] == '\n') break;
             d0 = dtime();
@@ -64,35 +69,36 @@ static char *read_string(){
 }
 
 /**
- * Try to connect to `device` at BAUD_RATE speed
- * @return connection speed if success or 0
+ * Try to connect to `device` at baudrate speed
+ * @return 1 if OK
  */
-void try_connect(char *device){
-    if(!device) return;
-    char tmpbuf[4096];
+int try_connect(char *device, int baudrate){
+    if(!device) return 0;
     fflush(stdout);
-    tty_init(device);
-    while(read_tty(tmpbuf, 4096)); // clear rbuf
-    LOG("Connected to %s", device);
+    ttydescr = new_tty(device, baudrate, 1024);
+    if(ttydescr) ttydescr = tty_open(ttydescr, 1); // exclusive open
+    if(!ttydescr) return 0;
+    while(read_tty(ttydescr)); // clear rbuf
+    LOGMSG("Connected to %s", device);
+    return 1;
 }
 
 /**
  * run terminal emulation: send user's commands and show answers
  */
 void run_terminal(){
+    if(!ttydescr) ERRX("Terminal not connected");
     green(_("Work in terminal mode without echo\n"));
     int rb;
-    char buf[BUFLEN];
     size_t l;
     setup_con();
     while(1){
-        if((l = read_tty(buf, BUFLEN - 1))){
-            buf[l] = 0;
-            printf("%s", buf);
+        if((l = read_tty(ttydescr))){
+            printf("%s", ttydescr->buf);
         }
         if((rb = read_console())){
-            buf[0] = (char) rb;
-            write_tty(buf, 1);
+            char c = (char) rb;
+            write_tty(ttydescr->comfd, &c, 1);
         }
     }
 }

Daemons/netdaemon/term.h

@@ -22,6 +22,8 @@
 #ifndef __TERM_H__
 #define __TERM_H__
 
+#include <usefull_macros.h>
+
 #define FRAME_MAX_LENGTH        (300)
 #define MAX_MEMORY_DUMP_SIZE    (0x800 * 4)
 // Terminal timeout (seconds)
@@ -29,8 +31,9 @@
 // Terminal polling timeout - 1 second
 #define     T_POLLING_TMOUT     (1.0)
 
+extern TTY_descr *ttydescr;
 void run_terminal();
-void try_connect(char *device);
+int try_connect(char *device, int baudrate);
 char *poll_device();
 
 #endif // __TERM_H__

Daemons/weatherdaemon/Makefile

@@ -0,0 +1,43 @@
+# run `make DEF=...` to add extra defines
+PROGRAM := weatherdaemon
+LDFLAGS := -fdata-sections -ffunction-sections -Wl,--gc-sections -Wl,--discard-all -pthread
+LDFLAGS += -lusefull_macros
+SRCS := $(wildcard *.c)
+DEFINES := $(DEF) -D_GNU_SOURCE -D_XOPEN_SOURCE=1111
+DEFINES += -DEBUG
+# baudrate for USB<->UART converter
+OBJDIR := mk
+CFLAGS += -O2 -Wall -Werror -Wextra -Wno-trampolines
+OBJS := $(addprefix $(OBJDIR)/, $(SRCS:%.c=%.o))
+DEPS := $(OBJS:.o=.d)
+CC = gcc
+
+all : $(OBJDIR) $(PROGRAM)
+
+$(PROGRAM) : $(OBJS)
+	@echo -e "\t\tLD $(PROGRAM)"
+	$(CC) $(LDFLAGS) $(OBJS) -o $(PROGRAM)
+
+$(OBJDIR):
+	mkdir $(OBJDIR)
+
+ifneq ($(MAKECMDGOALS),clean)
+-include $(DEPS)
+endif
+
+$(OBJDIR)/%.o: %.c
+	@echo -e "\t\tCC $<"
+	$(CC) -MD -c $(LDFLAGS) $(CFLAGS) $(DEFINES) -o $@ $<
+
+clean:
+	@echo -e "\t\tCLEAN"
+	@rm -f $(OBJS) $(DEPS)
+	@rmdir $(OBJDIR) 2>/dev/null || true
+
+xclean: clean
+	@rm -f $(PROGRAM)
+
+gentags:
+	CFLAGS="$(CFLAGS) $(DEFINES)" geany -g $(PROGRAM).c.tags *[hc] 2>/dev/null
+
+.PHONY: gentags clean xclean

Daemons/weatherdaemon/Readme.md

@@ -0,0 +1,19 @@
+Weather daemon
+==================
+
+Open a socket at given port (default: 4444)
+Parse weather data and send it to client
+
+Usage: weatherdaemon [args]
+
+        Where args are:
+
+  -b, --baudrate=arg    serial terminal baudrate (default: 115200)
+  -e, --emulation       emulate serial device
+  -h, --help            show this help
+  -i, --device=arg      serial device name (default: none)
+  -l, --logfile=arg     save logs to file (default: none)
+  -p, --port=arg        network port to connect (default: 4444)
+  -v, --verb            logfile verbocity level (each -v increase it)
+
+

Daemons/weatherdaemon/cmdlnopts.c

@@ -0,0 +1,90 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2021 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include <strings.h>
+#include <math.h>
+#include <usefull_macros.h>
+#include "cmdlnopts.h"
+#include "term.h"
+
+/*
+ * here are global parameters initialisation
+ */
+int help;
+static glob_pars  G;
+
+// default values for Gdefault & help
+#define DEFAULT_PORT    "4444"
+
+//            DEFAULTS
+// default global parameters
+glob_pars const Gdefault = {
+    .device = NULL,
+    .port = DEFAULT_PORT,
+    .logfile = NULL,
+    .verb = 0,
+    .tty_speed = 115200,
+    .rest_pars = NULL,
+    .rest_pars_num = 0,
+    .emul = 0
+};
+
+/*
+ * Define command line options by filling structure:
+ *  name        has_arg     flag    val     type        argptr              help
+*/
+myoption cmdlnopts[] = {
+// common options
+    {"help",    NO_ARGS,    NULL,   'h',    arg_int,    APTR(&help),        _("show this help")},
+    {"device",  NEED_ARG,   NULL,   'i',    arg_string, APTR(&G.device),    _("serial device name (default: none)")},
+    {"port",    NEED_ARG,   NULL,   'p',    arg_string, APTR(&G.port),      _("network port to connect (default: " DEFAULT_PORT ")")},
+    {"logfile", NEED_ARG,   NULL,   'l',    arg_string, APTR(&G.logfile),   _("save logs to file (default: none)")},
+    {"verb",    NO_ARGS,    NULL,   'v',    arg_none,   APTR(&G.verb),      _("logfile verbocity level (each -v increase it)")},
+    {"baudrate",NEED_ARG,   NULL,   'b',    arg_int,    APTR(&G.tty_speed), _("serial terminal baudrate (default: 115200)")},
+    {"emulation",NO_ARGS,   NULL,   'e',    arg_int,    APTR(&G.emul),      _("emulate serial device")},
+    end_option
+};
+
+/**
+ * Parse command line options and return dynamically allocated structure
+ *      to global parameters
+ * @param argc - copy of argc from main
+ * @param argv - copy of argv from main
+ * @return allocated structure with global parameters
+ */
+glob_pars *parse_args(int argc, char **argv){
+    int i;
+    void *ptr;
+    ptr = memcpy(&G, &Gdefault, sizeof(G)); assert(ptr);
+    // format of help: "Usage: progname [args]\n"
+    change_helpstring("Usage: %s [args]\n\n\tWhere args are:\n");
+    // parse arguments
+    parseargs(&argc, &argv, cmdlnopts);
+    if(help) showhelp(-1, cmdlnopts);
+    if(argc > 0){
+        G.rest_pars_num = argc;
+        G.rest_pars = calloc(argc, sizeof(char*));
+        for (i = 0; i < argc; i++)
+            G.rest_pars[i] = strdup(argv[i]);
+    }
+    return &G;
+}
+

Daemons/weatherdaemon/cmdlnopts.h

@@ -0,0 +1,43 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2021 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+
+#pragma once
+#ifndef __CMDLNOPTS_H__
+#define __CMDLNOPTS_H__
+
+/*
+ * here are some typedef's for global data
+ */
+typedef struct{
+    char *device;           // serial device name
+    char *port;             // port to connect
+    char *logfile;          // logfile name
+    int terminal;           // run as terminal
+    int echo;               // echo user commands back
+    int verb;               // verbocity level
+    int tty_speed;          // serial terminal baudrate
+    int emul;               // emulation of serial device
+    int rest_pars_num;      // number of rest parameters
+    char** rest_pars;       // the rest parameters: array of char* (path to logfile and thrash)
+} glob_pars;
+
+
+glob_pars *parse_args(int argc, char **argv);
+#endif // __CMDLNOPTS_H__

Daemons/weatherdaemon/main.c

@@ -0,0 +1,82 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2021 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <signal.h>
+#include <stdio.h>
+#include <sys/wait.h> // wait
+#include <sys/prctl.h> //prctl
+#include <usefull_macros.h>
+#include "cmdlnopts.h"
+#include "socket.h"
+#include "term.h"
+
+glob_pars *GP;
+
+void signals(int signo){
+    restore_console();
+    if(ttydescr) close_tty(&ttydescr);
+    LOGERR("exit with status %d", signo);
+    exit(signo);
+}
+
+int main(int argc, char **argv){
+    initial_setup();
+    signal(SIGTERM, signals); // kill (-15) - quit
+    signal(SIGHUP, SIG_IGN);  // hup - ignore
+    signal(SIGINT, signals);  // ctrl+C - quit
+    signal(SIGQUIT, signals); // ctrl+\ - quit
+    signal(SIGTSTP, SIG_IGN); // ignore ctrl+Z
+    GP = parse_args(argc, argv);
+    if(GP->logfile){
+        sl_loglevel lvl = LOGLEVEL_ERR;
+        for(; GP->verb && lvl < LOGLEVEL_ANY; --GP->verb) ++lvl;
+        DBG("Loglevel: %d", lvl);
+        if(!OPENLOG(GP->logfile, lvl, 1)) ERRX("Can't open log file");
+        LOGERR("Started");
+    }
+    #ifndef EBUG
+    if(daemon(1, 0)){
+        ERR("daemon()");
+    }
+    while(1){ // guard for dead processes
+        pid_t childpid = fork();
+        if(childpid){
+            LOGDBG("create child with PID %d\n", childpid);
+            DBG("Created child with PID %d\n", childpid);
+            wait(NULL);
+            WARNX("Child %d died\n", childpid);
+            LOGWARN("Child %d died\n", childpid);
+            sleep(1);
+        }else{
+            prctl(PR_SET_PDEATHSIG, SIGTERM); // send SIGTERM to child when parent dies
+            break; // go out to normal functional
+        }
+    }
+    #endif
+
+    if(GP->device) if(!try_connect(GP->device, GP->tty_speed)){
+        LOGERR("Can't connect to device");
+        ERRX("Can't connect to device");
+    }
+    if(!GP->device && !GP->emul){
+        LOGERR("Need serial device name or emulation flag");
+        ERRX("Need serial device name or emulation flag");
+    }
+    daemonize(GP->port);
+    return 0;
+}

Daemons/weatherdaemon/socket.c

@@ -0,0 +1,347 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2021 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <netdb.h>      // addrinfo
+#include <arpa/inet.h>  // inet_ntop
+#include <limits.h>     // INT_xxx
+#include <poll.h>       // poll
+#include <pthread.h>
+#include <signal.h>     // pthread_kill
+#include <stdio.h>
+#include <string.h>
+#include <sys/syscall.h> // syscall
+#include <unistd.h>     // daemon
+#include <usefull_macros.h>
+
+#include "cmdlnopts.h"   // glob_pars
+#include "socket.h"
+#include "term.h"
+
+// temporary buffers
+#define BUFLEN    (1024)
+// Max amount of connections
+#define BACKLOG   (30)
+
+extern glob_pars *GP;
+
+static char *answer = NULL;
+static int freshdata = 0;
+static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+
+/**************** SERVER FUNCTIONS ****************/
+/**
+ * Send data over socket
+ * @param sock      - socket fd
+ * @param webquery  - ==1 if this is web query
+ * @param textbuf   - zero-trailing buffer with data to send
+ * @return 1 if all OK
+ */
+static int send_data(int sock, int webquery, char *textbuf){
+    ssize_t L, Len;
+    char tbuf[BUFLEN];
+    Len = strlen(textbuf);
+    // OK buffer ready, prepare to send it
+    if(webquery){
+        L = snprintf((char*)tbuf, BUFLEN,
+            "HTTP/2.0 200 OK\r\n"
+            "Access-Control-Allow-Origin: *\r\n"
+            "Access-Control-Allow-Methods: GET, POST\r\n"
+            "Access-Control-Allow-Credentials: true\r\n"
+            "Content-type: text/plain\r\nContent-Length: %zd\r\n\r\n", Len);
+        if(L < 0){
+            WARN("sprintf()");
+            LOGWARN("sprintf()");
+            return 0;
+        }
+        if(L != write(sock, tbuf, L)){
+            LOGWARN("Can't write header");
+            WARN("write");
+            return 0;
+        }
+    }
+    // send data
+    //DBG("send %zd bytes\nBUF: %s", Len, buf);
+    if(Len != write(sock, textbuf, Len)){
+        WARN("write()");
+        LOGERR("send_data(): write() failed");
+        return 0;
+    }
+    LOGDBG("fd %d, write %s", textbuf);
+    return 1;
+}
+
+// search a first word after needle without spaces
+static char* stringscan(char *str, char *needle){
+    char *a;//, *e;
+    char *end = str + strlen(str);
+    a = strstr(str, needle);
+    if(!a) return NULL;
+    a += strlen(needle);
+    while (a < end && (*a == ' ' || *a == '\r' || *a == '\t' || *a == '\r')) a++;
+    if(a >= end) return NULL;
+    return a;
+}
+
+/**
+ * @brief handle_socket - read information from socket
+ * @param sock - socket fd
+ * @param chkheader - ==1 on first run
+ * @return 1 if socket closed
+ */
+static int handle_socket(int sock, int notchkhdr){
+    FNAME();
+    int webquery = 0; // whether query is web or regular
+    char buff[BUFLEN];
+    ssize_t rd;
+    if(!(rd = read(sock, buff, BUFLEN-1))){
+        LOGMSG("Client %d closed", sock);
+        return 1;
+    }
+    //LOG("client send %zd bytes", rd);
+    DBG("Got %zd bytes", rd);
+    if(rd < 0){ // error
+        LOGWARN("Client %d close socket on error", sock);
+        DBG("Nothing to read from fd %d (ret: %zd)", sock, rd);
+        return 1;
+    }
+    // add trailing zero to be on the safe side
+    buff[rd] = 0;
+    // now we should check what do user want
+    char *found = buff;
+    DBG("user send: %s", buff);
+    if(!notchkhdr){
+        if(0 == strncmp(buff, "GET", 3)){
+            DBG("GET");
+            // GET web query have format GET /some.resource
+            webquery = 1;
+            char *slash = strchr(buff, '/');
+            if(slash){
+                found = slash + 1;
+                char *eol = strstr(found, "HTTP");
+                if(eol) *eol = 0;
+            }
+        }else if(0 == strncmp(buff, "POST", 4)){
+            DBG("POST");
+            webquery = 1;
+            // search content length of POST query
+            char *cl = stringscan(buff, "Content-Length:");
+            if(cl){
+                int contlen = atoi(cl);
+                int l = strlen(buff);
+                if(contlen && l > contlen)  found = &buff[l - contlen];
+            }
+        }
+    }
+    // here we can process user data
+    DBG("found=%s", found);
+    LOGDBG("sockfd=%d, got %s", sock, buff);
+    if(GP->echo){
+        if(!send_data(sock, webquery, found)){
+            LOGWARN("Can't send data, some error occured");
+            return 1;
+        }
+    }
+    if(answer) send_data(sock, webquery, answer);
+    else send_data(sock, webquery, "No data\n");
+    if(webquery) return 1; // close web query after message processing
+    return 0;
+}
+
+// main socket server
+static void *server(void *asock){
+    LOGMSG("server()");
+    int sock = *((int*)asock);
+    if(listen(sock, BACKLOG) == -1){
+        LOGERR("listen() failed");
+        WARN("listen");
+        return NULL;
+    }
+    int nfd = 1; // current fd amount in poll_set
+    struct pollfd poll_set[MAX_FDS];
+    int notchkhdr[MAX_FDS];
+    memset(poll_set, 0, sizeof(poll_set));
+    memset(notchkhdr, 0, sizeof(notchkhdr));
+    poll_set[0].fd = sock;
+    poll_set[0].events = POLLIN;
+    double lastdatat = dtime();
+    while(1){
+        poll(poll_set, nfd, 1); // poll for 1ms
+        for(int fdidx = 0; fdidx < nfd; ++fdidx){ // poll opened FDs
+            if((poll_set[fdidx].revents & POLLIN) == 0) continue;
+            poll_set[fdidx].revents = 0;
+            if(fdidx){ // client
+                int fd = poll_set[fdidx].fd;
+                if(handle_socket(fd, notchkhdr[fdidx])){ // socket closed - remove it from list
+                    close(fd);
+                    DBG("Client with fd %d closed", fd);
+                    LOGMSG("Client %d disconnected", fd);
+                    // move last to free space
+                    poll_set[fdidx] = poll_set[nfd - 1];
+                    notchkhdr[fdidx] = notchkhdr[nfd - 1];
+                    --nfd;
+                }else notchkhdr[fdidx] = 1;
+            }else{ // server
+                socklen_t size = sizeof(struct sockaddr_in);
+                struct sockaddr_in their_addr;
+                int newsock = accept(sock, (struct sockaddr*)&their_addr, &size);
+                if(newsock <= 0){
+                    LOGERR("server(): accept() failed");
+                    WARN("accept()");
+                    continue;
+                }
+                struct in_addr ipAddr = their_addr.sin_addr;
+                char str[INET_ADDRSTRLEN];
+                inet_ntop(AF_INET, &ipAddr, str, INET_ADDRSTRLEN);
+                DBG("Connection from %s, give fd=%d", str, newsock);
+                LOGMSG("Got connection from %s, fd=%d", str, newsock);
+                if(nfd == MAX_FDS){
+                    LOGWARN("Max amount of connections: disconnect %s (%d)", str, newsock);
+                    send_data(newsock, 0, "Max amount of connections reached!\n");
+                    WARNX("Limit of connections reached");
+                    close(newsock);
+                }else{
+                    memset(&poll_set[nfd], 0, sizeof(struct pollfd));
+                    poll_set[nfd].fd = newsock;
+                    poll_set[nfd].events = POLLIN;
+                    notchkhdr[nfd] = 0;
+                    ++nfd;
+                }
+            }
+        } // endfor
+        if(freshdata && answer){ // send new data to all
+            freshdata = 0;
+            lastdatat = dtime();
+            for(int fdidx = 1; fdidx < nfd; ++fdidx){
+                if(notchkhdr[fdidx])
+                    send_data(poll_set[fdidx].fd, 0, answer);
+            }
+        }
+        if(dtime() - lastdatat > NODATA_TMOUT){
+            LOGERR("No data timeout");
+            ERRX("No data timeout");
+        }
+    }
+    LOGERR("server(): UNREACHABLE CODE REACHED!");
+}
+
+static void *ttyparser(_U_ void *notused){
+    double tlast = 0;
+    while(1){
+        if(dtime() - tlast > T_INTERVAL){
+            char *got = poll_device();
+            if(got){
+                if (0 == pthread_mutex_lock(&mutex)){
+                    FREE(answer);
+                    answer = strdup(got);
+                    freshdata = 1;
+                    pthread_mutex_unlock(&mutex);
+                }
+                tlast = dtime();
+            }
+        }
+        sleep(1);
+    }
+    return NULL;
+}
+
+// data gathering & socket management
+static void daemon_(int sock){
+    if(sock < 0) return;
+    pthread_t sock_thread, parser_thread;
+    if(pthread_create(&sock_thread, NULL, server, (void*) &sock)){
+        LOGERR("daemon_(): pthread_create(sock_thread) failed");
+        ERR("pthread_create()");
+    }
+    if(pthread_create(&parser_thread, NULL, ttyparser, NULL)){
+        LOGERR("daemon_(): pthread_create(parser_thread) failed");
+        ERR("pthread_create()");
+    }
+    do{
+        if(pthread_kill(sock_thread, 0) == ESRCH){ // died
+            WARNX("Sockets thread died");
+            LOGWARN("Sockets thread died");
+            pthread_join(sock_thread, NULL);
+            if(pthread_create(&sock_thread, NULL, server, (void*) &sock)){
+                LOGERR("daemon_(): new pthread_create() failed");
+                ERR("pthread_create()");
+            }
+        }
+        if(pthread_kill(parser_thread, 0) == ESRCH){ // died
+            WARNX("TTY thread died");
+            LOGWARN("TTY thread died");
+            pthread_join(parser_thread, NULL);
+            if(pthread_create(&parser_thread, NULL, ttyparser, NULL)){
+                LOGERR("daemon_(): new pthread_create(parser_thread) failed");
+                ERR("pthread_create()");
+            }
+        }
+        usleep(1000); // sleep a little
+    }while(1);
+    LOGERR("daemon_(): UNREACHABLE CODE REACHED!");
+}
+
+/**
+ * Run daemon service
+ */
+void daemonize(char *port){
+    FNAME();
+    int sock = -1;
+    struct addrinfo hints, *res, *p;
+    memset(&hints, 0, sizeof(hints));
+    hints.ai_family = AF_INET;
+    hints.ai_socktype = SOCK_STREAM;
+    hints.ai_flags = AI_PASSIVE;
+    // To accept only local sockets replace NULL with "127.0.0.1" and remove AI_PASSIVE
+    if(getaddrinfo(NULL, port, &hints, &res) != 0){
+        LOGERR("getaddrinfo");
+        ERR("getaddrinfo");
+    }
+    struct sockaddr_in *ia = (struct sockaddr_in*)res->ai_addr;
+    char str[INET_ADDRSTRLEN];
+    inet_ntop(AF_INET, &(ia->sin_addr), str, INET_ADDRSTRLEN);
+    // loop through all the results and bind to the first we can
+    for(p = res; p != NULL; p = p->ai_next){
+        if((sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1){
+            WARN("socket");
+            continue;
+        }
+        int reuseaddr = 1;
+        if(setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &reuseaddr, sizeof(int)) == -1){
+            LOGERR("setsockopt() error");
+            ERR("setsockopt");
+        }
+        if(bind(sock, p->ai_addr, p->ai_addrlen) == -1){
+            close(sock);
+            WARN("bind");
+            LOGWARN("bind() error");
+            continue;
+        }
+        break; // if we get here, we have a successfull connection
+    }
+    if(p == NULL){
+        LOGERR("daemonize(): failed to bind socket, exit");
+        // looped off the end of the list with no successful bind
+        ERRX("failed to bind socket");
+    }
+    freeaddrinfo(res);
+    daemon_(sock);
+    close(sock);
+    LOGERR("daemonize(): UNREACHABLE CODE REACHED!");
+    signals(0);
+}
+

Daemons/weatherdaemon/socket.h

@@ -0,0 +1,32 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2021 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#ifndef __SOCKET_H__
+#define __SOCKET_H__
+
+// time interval for data polling (seconds)
+#define T_INTERVAL      (10.)
+// max amount of opened fd (+1 for server socket)
+#define MAX_FDS         (11)
+// no data timeout
+#define NODATA_TMOUT    (90.)
+
+void daemonize(char *port);
+
+#endif // __SOCKET_H__

Daemons/weatherdaemon/term.c

@@ -0,0 +1,168 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2021 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <ctype.h>  // isspace
+#include <stdio.h>
+#include <string.h>
+#include <strings.h> // strncasecmp
+#include <time.h>    // time(NULL)
+#include <limits.h>  // INT_MAX, INT_MIN
+#include "term.h"
+#include "cmdlnopts.h"
+
+#define BUFLEN 1024
+
+TTY_descr *ttydescr = NULL;
+extern glob_pars *GP;
+
+static char buf[BUFLEN];
+static const char *emultemplate = "<?U> 06:50:36, 20.01.00, TE-2.20, DR1405.50, WU2057.68, RT0.00, WK1.00, WR177.80, WT-2.20, FE0.69, RE0.00, WG7.36, WV260.03, TI0.00, FI0.00,";
+
+/**
+ * read strings from terminal (ending with '\n') with timeout
+ * @return NULL if nothing was read or pointer to static buffer
+ */
+static char *read_string(){
+    //static int done = 0;
+    if(GP->emul){
+        //if(done) return NULL;
+        strncpy(buf, emultemplate, BUFLEN);
+        //done = 1;
+        return buf;
+    }
+    if(!ttydescr) ERRX("Serial device not initialized");
+    size_t r = 0, l;
+    int LL = BUFLEN - 1;
+    char *ptr = buf;
+    double d0 = dtime();
+    do{
+        if((l = read_tty(ttydescr))){
+            r += l; LL -= l; ptr += l;
+            d0 = dtime();
+        }
+    }while(dtime() - d0 < WAIT_TMOUT && LL);
+    if(r){
+        buf[r] = 0;
+        return buf;
+    }
+    return NULL;
+}
+
+/**
+ * Try to connect to `device` at baudrate speed
+ * @return 1 if OK
+ */
+int try_connect(char *device, int baudrate){
+    if(!device) return 0;
+    fflush(stdout);
+    ttydescr = new_tty(device, baudrate, 1024);
+    if(ttydescr) ttydescr = tty_open(ttydescr, 1); // exclusive open
+    if(!ttydescr) return 0;
+    while(read_tty(ttydescr)); // clear rbuf
+    LOGMSG("Connected to %s", device);
+    return 1;
+}
+
+/**
+ * @brief getpar - get parameter value
+ * @param string (i) - string where to search
+ * @param Val (o)    - value found
+ * @param Name       - parameter name
+ * @return 0 if found
+ */
+static int getpar(char *string, double *Val, char *Name){
+    char *p = strstr(string, Name);
+    if(!p) return 1;
+    p += strlen(Name);
+    DBG("search %s", Name);
+    if(!Val) return 0;
+    char *endptr;
+    *Val = strtod(p, &endptr);
+    DBG("eptr=%s, val=%g", endptr, *Val);
+    if(endptr == string){
+        WARNX("Double value not found");
+        return 2;
+    }
+    return 0;
+}
+
+
+/**
+ * Poll serial port for new dataportion
+ * @return: NULL if no data received, pointer to string if valid data received
+ */
+char *poll_device(){
+    static char ans[BUFLEN];
+    char *ptr = ans, *r = NULL;
+    if(!GP->emul){
+        if(write_tty(ttydescr->comfd, "?U\r\n", 4))
+            return NULL;
+    }
+    double t0 = dtime();
+    while(dtime() - t0 < T_POLLING_TMOUT){
+        if((r = read_string())){ // parse new data
+            DBG("got %s", r);
+            if(strncmp(r, "<?U>", 4)){
+                WARNX("Wrong answer");
+                LOGWARN("poll_device() get wrong answer: %s", r);
+                return NULL;
+            }
+            r += 4;
+            DBG("R=%s", r);
+            while(*r){if(isspace(*r)) ++r; else break;}
+            DBG("R=%s", r);
+            char *eol = strchr(r, '\n');
+            if(eol) *eol = 0;
+            double d;
+            size_t L = BUFLEN, l;
+            if(!getpar(r, &d, "RT")){
+                l = snprintf(ptr, L, "Rain=%g\n", d);
+                if(l > 0){
+                    L -= l;
+                    ptr += l;
+                }
+            }
+            if(!getpar(r, &d, "WU")){
+                l = snprintf(ptr, L, "Clouds=%g\n", d);
+                if(l > 0){
+                    L -= l;
+                    ptr += l;
+                }
+            }
+            if(!getpar(r, &d, "TE")){
+                l = snprintf(ptr, L, "Exttemp=%g\n", d);
+                if(l > 0){
+                    L -= l;
+                    ptr += l;
+                }
+            }
+            if(!getpar(r, &d, "WG")){
+                l = snprintf(ptr, L, "Wind=%g\n", d/3.6);
+                if(l > 0){
+                    L -= l;
+                    ptr += l;
+                }
+            }
+            snprintf(ptr, L, "Time=%lld\n", (long long)time(NULL));
+            DBG("Buffer: %s", ans);
+            return ans;
+        }
+    }
+    return NULL;
+}
+

Daemons/weatherdaemon/term.h

@@ -0,0 +1,37 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2021 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#ifndef __TERM_H__
+#define __TERM_H__
+
+#include <usefull_macros.h>
+
+#define FRAME_MAX_LENGTH        (300)
+#define MAX_MEMORY_DUMP_SIZE    (0x800 * 4)
+// Terminal timeout (seconds)
+#define     WAIT_TMOUT          (0.5)
+// Terminal polling timeout - 1 second
+#define     T_POLLING_TMOUT     (1.0)
+
+extern TTY_descr *ttydescr;
+void run_terminal();
+int try_connect(char *device, int baudrate);
+char *poll_device();
+
+#endif // __TERM_H__