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 }