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POLinux receive signal break for ttycontrol program
 

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  1. POLinux receive signal break for ttycontrol program
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    <p>I would like to receive SIGINT if my process controlling /dev/ttyS2 receives BREAK on a serial port. I run this program from a shell. From what I discovered only "the terminal is the controlling terminal of a foreground process group, it will cause a SIGINT to be sent to this foreground process group" I tried make process making controller of terminal but it fails. </p> <pre><code>#include &lt;sys/types.h&gt; #include &lt;sys/stat.h&gt; #include &lt;sys/ioctl.h&gt; #include &lt;unistd.h&gt; #include &lt;fcntl.h&gt; #include &lt;termios.h&gt; #include &lt;errno.h&gt; #include &lt;stdio.h&gt; #include &lt;signal.h&gt; #include &lt;string.h&gt; #define BAUDRATE B115200 #define MODEMDEVICE "/dev/ttyS2" #define _POSIX_SOURCE 1 /* POSIX compliant source */ #define FALSE 0 #define TRUE 1 __sighandler_t sighandle(int signum, __sighandler_t h) { fprintf(stderr, "BREAK DETECTED\n"); signal(SIGINT, (__sighandler_t) sighandle); return SIG_IGN; } volatile int STOP=FALSE; int main() { int fd,c, res; struct termios oldtio,newtio; char buf[255]; pid_t pid; signal(SIGINT, (__sighandler_t) sighandle); fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY ); if (fd &lt;0) {perror(MODEMDEVICE); return (-1); } tcgetattr(fd,&amp;oldtio); /* save current port settings */ memset(&amp;newtio, 0,sizeof(newtio)); newtio.c_cflag |= BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD | BRKINT; newtio.c_iflag &amp;= ~IGNBRK ; newtio.c_oflag = 0; /* set input mode (non-canonical, no echo,...) */ newtio.c_lflag = 0; newtio.c_cc[VTIME] = 0; /* inter-character timer unused */ newtio.c_cc[VMIN] = 1; /* blocking read until 5 chars received */ tcflush(fd, TCIFLUSH); tcsetattr(fd,TCSANOW,&amp;newtio); if( ioctl(fd, TIOCSCTTY, 1) &lt;0 ) { printf("Error number: %d\n", errno); } if ( tcsetpgrp(fd, tcgetpgrp(0) ) &lt; 0 ) { syslog(LOG_PERROR,"tcsetpgrp failed: %d " ,errno); syslog(LOG_PERROR,"EBADF is %d " ,EBADF); syslog(LOG_PERROR,"EINVAL is %d " ,EINVAL); syslog(LOG_PERROR,"ENOTTY is %d " ,ENOTTY); syslog(LOG_PERROR,"EPERM is %d " ,EPERM); } while (STOP==FALSE) { /* loop for input */ res = read(fd,buf,255); /* returns after 5 chars have been input */ buf[res]=0; /* so we can printf... */ printf(":%s:%d\n", buf, res); if (buf[0]=='z') {STOP=TRUE;} } tcsetattr(fd,TCSANOW,&amp;oldtio); return 0; } </code></pre>
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    1. USJonathan Leffler
    1. USCrazyChris
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    1. CO_POSIX_SOURCE of 1 is invoking POSIX 1990; you'd probably do better with '#define _XOPEN_SOURCE 600' (or possibly 500). You'd probably do better with sigaction() over signal(). However, neither of these accounts for what you're not seeing.
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      1. POLinux receive signal break for ttycontrol program
      1. USJonathan Leffler
 

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