fixed socket read bug

client.c

@@ -55,18 +55,24 @@ static size_t imbufsz = 0; // image buffer for allocated `ima`
 static uint8_t *imbuf = NULL;
 #endif
 
+// read message from queue or file descriptor
 static char *readmsg(int fd){
     static cc_strbuff *buf = NULL;
-    if(!buf) buf = cc_strbufnew(BUFSIZ, 255);
-    if(1 == cc_canberead(fd)){
-        if(cc_read2buf(fd, buf)){
+    if(!buf) buf = cc_strbufnew(BUFSIZ, 256);
+    int test(){
         size_t got = cc_getline(buf);
         if(got > 255){
             DBG("Client fd=%d gave buffer overflow", fd);
             LOGMSG("SERVER client fd=%d buffer overflow", fd);
         }else if(got){
-                return buf->string;
+            return TRUE;
         }
+        return FALSE;
+    }
+    if(test()) return buf->string;
+    if(1 == cc_canberead(fd)){
+        if(cc_read2buf(fd, buf)){
+            if(test()) return buf->string;
         }else ERRX("Server disconnected");
     }
     return NULL;
@@ -120,6 +126,7 @@ DBG("1 msg-> %s, ans -> %s", msg, ans);
             DBG("BREAK");
             break;
         }
+
     }
     return ((ans) ? TRUE : FALSE);
 }

cmdlnopts.c

@@ -31,6 +31,7 @@ static glob_pars  G = {
     .setwheel = -1,
     .fanspeed = -1,
     .shmkey = 7777777,
+    .anstmout = -1,
     .infty = -1
 };
 
@@ -109,6 +110,7 @@ myoption cmdlnopts[] = {
     {"client",  NO_ARGS,    &G.client,1,    arg_none,   NULL,               N_("run as client")},
     {"viewer",  NO_ARGS,    &G.viewer,1,    arg_none,   NULL,               N_("passive viewer (only get last images)")},
     {"restart", NO_ARGS,    &G.restart,1,   arg_none,   NULL,               N_("restart image server")},
+    {"timeout", NEED_ARG,   NULL,   '0',    arg_double, APTR(&G.anstmout),  N_("network answer timeout (default: 0.1s)")},
 
     {"shmkey", NEED_ARG,    NULL,   'k',    arg_int,    APTR(&G.shmkey),    N_("shared memory (with image data) key (default: 7777777)")},
     {"forceimsock",NO_ARGS, &G.forceimsock,1, arg_none, NULL,               N_("force using image through socket transition even if can use SHM")},

cmdlnopts.h

@@ -75,6 +75,7 @@ typedef struct{
     int infty;          // run (==1) or stop (==0) infinity loop
     float gain;         // gain level (only for CMOS)
     float brightness;   // brightness (only for CMOS)
+    double anstmout;    // answer timeout by socket
     double exptime;     // time of exposition in seconds
     double temperature; // temperature of CCD
     double gotopos;     // move stepper motor of focuser to absolute position

main.c

@@ -91,6 +91,9 @@ int main(int argc, char **argv){
         struct stat filestat;
         if(0 == stat(GP->outfile, &filestat)) ERRX("File %s exists!", GP->outfile);
     }
+    if(GP->anstmout > 0.){
+        if(!cc_setAnsTmout(GP->anstmout)) ERRX("Can't set answer timeout to %g", GP->anstmout);
+    }
     if(GP->port){
         if(GP->path){
             WARNX("Options `port` and `path` can't be used together! Point `port` for TCP socket or `path` for UNIX.");