Attachment 140425 Details for Bug 107062 – daemon which doesn't quit when SIGTERMed

daemon which doesn't quit when SIGTERMed

daemon.c (text/x-csrc), 1.70 KB, created by Iain Lane on 2018-07-02 11:11:14 UTC

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Creator: Iain Lane

Created: 2018-07-02 11:11:14 UTC

Size: 1.70 KB

patch

obsolete

>/*
> * daemonize.c
> * This example daemonizes a process, writes a few log messages,
> * sleeps 20 seconds and terminates afterwards.
> */
>
>#include <stdio.h>
>#include <stdlib.h>
>#include <unistd.h>
>#include <signal.h>
>#include <sys/types.h>
>#include <sys/stat.h>
>#include <syslog.h>
>
>static void skeleton_daemon()
>{
>    pid_t pid;
>
>    /* Fork off the parent process */
>    pid = fork();
>
>    /* An error occurred */
>    if (pid < 0)
>        exit(EXIT_FAILURE);
>
>    /* Success: Let the parent terminate */
>    if (pid > 0)
>        exit(EXIT_SUCCESS);
>
>    /* On success: The child process becomes session leader */
>    if (setsid() < 0)
>        exit(EXIT_FAILURE);
>
>    /* Catch, ignore and handle signals */
>    //TODO: Implement a working signal handler */
>    signal(SIGCHLD, SIG_IGN);
>    signal(SIGHUP, SIG_IGN);
>    signal(SIGTERM, SIG_IGN);
>
>    /* Fork off for the second time*/
>    pid = fork();
>
>    /* An error occurred */
>    if (pid < 0)
>        exit(EXIT_FAILURE);
>
>    /* Success: Let the parent terminate */
>    if (pid > 0)
>        exit(EXIT_SUCCESS);
>
>    /* Set new file permissions */
>    umask(0);
>
>    /* Change the working directory to the root directory */
>    /* or another appropriated directory */
>    chdir("/");
>
>    /* Close all open file descriptors */
>    int x;
>    for (x = sysconf(_SC_OPEN_MAX); x>=0; x--)
>    {
>        close (x);
>    }
>
>    /* Open the log file */
>    openlog ("firstdaemon", LOG_PID, LOG_DAEMON);
>}
>
>int main()
>{
>    skeleton_daemon();
>
>    while (1)
>    {
>        //TODO: Insert daemon code here.
>        syslog (LOG_NOTICE, "First daemon started.");
>        sleep (60);
>        break;
>    }
>
>    syslog (LOG_NOTICE, "First daemon terminated.");
>    closelog();
>
>    return EXIT_SUCCESS;
>}

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Attachments on bug 107062: 140379 | 140420 | 140425

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