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	setsid.c - sbase - suckless unix tools
	git clone git://git.suckless.org/sbase
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	---
	setsid.c (677B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <errno.h>
	3 #include <unistd.h>
	4
	5 #include "util.h"
	6
	7 static int fflag = 0;
	8
	9 static void
	10 usage(void)
	11 {
	12 eprintf("usage: %s [-f] cmd [arg ...]\n", argv0);
	13 }
	14
	15 int
	16 main(int argc, char *argv[])
	17 {
	18 int savederrno;
	19
	20 ARGBEGIN {
	21 case 'f':
	22 fflag = 1;
	23 break;
	24 default:
	25 usage();
	26 } ARGEND
	27
	28 if (!argc)
	29 usage();
	30
	31 if (fflag \|\| getpgrp() == getpid()) {
	32 switch (fork()) {
	33 case -1:
	34 eprintf("fork:");
	35 case 0:
	36 break;
	37 default:
	38 return 0;
	39 }
	40 }
	41 if (setsid() < 0)
	42 eprintf("setsid:");
	43 execvp(argv[0], argv);
	44 savederrno = errno;
	45 weprintf("execvp %s:", argv[0]);
	46
	47 _exit(126 + (savederrno == ENOENT));
	48 }