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add child process guard; fix error with steppers server disconnection

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This commit is contained in:
Edward Emelianov
2021-10-28 16:00:14 +03:00
parent 237b11d640
commit 39b9cee77c
5 changed files with 69 additions and 23 deletions
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20
LocCorr/main.c
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@@ -21,6 +21,8 @@
#include <signal.h> // signal
#include <stdio.h>
#include <string.h> // strdup
#include <sys/prctl.h> //prctl
#include <sys/wait.h> // wait
#include "cmdlnopts.h"
#include "config.h"
@@ -38,7 +40,7 @@ static InputType tp;
void signals(int sig){
if(sig){
signal(sig, SIG_IGN);
DBG("Get signal %d, quit.\n", sig);
DBG("Get signal %d.", sig);
}
stopwork = TRUE;
DBG("exit %d", sig);
@@ -181,7 +183,6 @@ int main(int argc, char *argv[]){
theconf.stpserverport = GP->pusiservport;
}
}
setpostprocess(GP->processing);
check4running(self, GP->pidfile);
DBG("%s started, snippets library version is %s\n", self, sl_libversion());
free(self); self = NULL;
@@ -190,6 +191,21 @@ int main(int argc, char *argv[]){
signal(SIGINT, signals); // ctrl+C - quit
signal(SIGQUIT, signals); // ctrl+\ - quit
signal(SIGTSTP, SIG_IGN); // ignore ctrl+Z
while(1){ // guard for dead processes
pid_t childpid = fork();
if(childpid){ // father
LOGMSG("create child with PID %d\n", childpid);
DBG("Created child with PID %d\n", childpid);
wait(NULL);
LOGMSG("child %d died\n", childpid);
WARNX("Child %d died\n", childpid);
sleep(5);
}else{ // son
prctl(PR_SET_PDEATHSIG, SIGTERM); // send SIGTERM to child when parent dies
break; // go out to normal functional
}
}
setpostprocess(GP->processing);
if(GP->logXYname) openXYlog(GP->logXYname);
LOGMSG("Start application...");
LOGDBG("xtag=%g, ytag=%g", theconf.xtarget, theconf.ytarget);