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/* setsid.c - Run program in a new session ID.
*
* Copyright 2006 Rob Landley <rob@landley.net>
USE_SETSID(NEWTOY(setsid, "^<1wcd[!dc]", TOYFLAG_USR|TOYFLAG_BIN))
config SETSID
bool "setsid"
default y
help
usage: setsid [-cdw] command [args...]
Run process in a new session.
-d Detach from tty
-c Control tty (become foreground process & receive keyboard signals)
-w Wait for child (and exit with its status)
*/
#define FOR_setsid
#include "toys.h"
void setsid_main(void)
{
int i;
// setsid() fails if we're already session leader, ala "exec setsid" from sh.
// Second call can't fail, so loop won't continue endlessly.
while (setsid()<0) {
pid_t pid;
// This must be before vfork() or tcsetpgrp() will hang waiting for parent.
setpgid(0, 0);
pid = XVFORK();
if (pid) {
i = 0;
if (FLAG(w)) {
i = 127;
if (pid>0) i = xwaitpid(pid);
}
_exit(i);
}
}
if (FLAG(c)) tcsetpgrp(0, getpid());
if (FLAG(d) && (i = open("/dev/tty", O_RDONLY)) != -1) {
ioctl(i, TIOCNOTTY);
close(i);
}
xexec(toys.optargs);
}
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