RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-14 09:24:57 +00:00
Code Issues Activity Actions

LibC: Add daemon(3) implementation to match behavior of Linux and BSDs

Browse source 
This helper that originally appeared in 4.4BSD helps to daemonize
a process by forking, setting itself as session leader, chdir to "/" and
closing stdin/stdout.
This commit is contained in:
Andrew Kaster 2022-01-11 01:50:09 -07:00 • committed by Linus Groh
parent 6fdd9cddb7
commit b13846e688
2 changed files with 34 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

33
Userland/Libraries/LibC/unistd.cpp
View file

@ -102,6 +102,39 @@ pid_t vfork()
return fork();
}
// Non-POSIX, but present in BSDs and Linux
// https://man.openbsd.org/daemon.3
int daemon(int nochdir, int noclose)
{
pid_t pid = fork();
if (pid < 0)
return -1;
// exit parent, continue execution in child
if (pid > 0)
_exit(0);
pid = setsid();
if (pid < 0)
return -1;
if (nochdir == 0)
(void)chdir("/");
if (noclose == 0) {
// redirect stdout and stderr to /dev/null
int fd = open("/dev/null", O_WRONLY);
if (fd < 0)
return -1;
(void)close(STDOUT_FILENO);
(void)close(STDERR_FILENO);
(void)dup2(fd, STDOUT_FILENO);
(void)dup2(fd, STDERR_FILENO);
(void)close(fd);
}
return 0;
}
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/execv.html
int execv(const char* path, char* const argv[])
{