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/* Licensed under BSD-MIT - see LICENSE file for details */
#include <ccan/daemonize/daemonize.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
/* This code is based on Stevens Advanced Programming in the UNIX
* Environment. */
bool daemonize(void)
{
pid_t pid;
/* Separate from our parent via fork, so init inherits us. */
if ((pid = fork()) < 0)
return false;
/* use _exit() to avoid triggering atexit() processing */
if (pid != 0)
_exit(0);
/* Don't hold files open. */
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
/* Many routines write to stderr; that can cause chaos if used
* for something else, so set it here. */
if (open("/dev/null", O_WRONLY) != 0)
return false;
if (dup2(0, STDERR_FILENO) != STDERR_FILENO)
return false;
close(0);
/* Session leader so ^C doesn't whack us. */
if (setsid() == (pid_t)-1)
return false;
/* Move off any mount points we might be in. */
if (chdir("/") != 0)
return false;
/* Discard our parent's old-fashioned umask prejudices. */
umask(0);
return true;
}
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