sbase/setsid.c

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/* (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
* See LICENSE file for license details. */
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#include <errno.h>
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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s cmd [arg ...]\n", argv0);
}
int
main(int argc, char *argv[])
{
ARGBEGIN {
default:
usage();
} ARGEND;
if (argc < 1)
usage();
if(getpgrp() == getpid()) {
switch(fork()){
case -1:
eprintf("fork:");
case 0:
break;
default:
exit(0);
}
}
if(setsid() < 0)
eprintf("setsid:");
execvp(argv[0], argv);
eprintf("execvp:");
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return (errno == ENOENT) ? 127 : 126;
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}