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conf: Add -P, --pid, to specify a file where own PID is written to

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Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-10-14 12:17:47 +02:00
parent 1cbd2c8c6b
commit 54a19002df
4 changed files with 48 additions and 3 deletions

25
passt.c
View file

@ -227,6 +227,27 @@ static void drop_caps(void)
}
}
/**
* pid_file() - Write own PID to file, if configured
* @c: Execution context
*/
static void pid_file(struct ctx *c) {
char pid_buf[12];
int pid_fd, n;
if (!c->pid_file)
return;
pid_fd = open(c->pid_file, O_CREAT | O_WRONLY);
if (pid_fd < 0)
return;
n = snprintf(pid_buf, sizeof(pid_buf), "%i\n", getpid());
write(pid_fd, pid_buf, n);
close(pid_fd);
}
/**
* main() - Entry point and main loop
* @argc: Argument count
@ -237,7 +258,7 @@ static void drop_caps(void)
* #syscalls read write open close fork dup2 exit chdir ioctl writev syslog
* #syscalls prlimit64 epoll_ctl epoll_create1 epoll_wait accept4 accept listen
* #syscalls socket bind connect getsockopt setsockopt recvfrom sendto shutdown
* #syscalls openat fstat fcntl lseek clone setsid exit_group
* #syscalls openat fstat fcntl lseek clone setsid exit_group getpid
* #syscalls:pasta rt_sigreturn
*/
int main(int argc, char **argv)
@ -327,6 +348,8 @@ int main(int argc, char **argv)
if (isatty(fileno(stdout)) && !c.foreground)
daemon(0, 0);
pid_file(&c);
timer_init(&c, &now);
loop:
nfds = epoll_wait(c.epollfd, events, EPOLL_EVENTS, TIMER_INTERVAL);