sbase/setsid.c

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/* See LICENSE file for copyright and 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>
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#include "util.h"
static void
usage(void)
{
eprintf("usage: %s cmd [arg ...]\n", argv0);
}
int
main(int argc, char *argv[])
{
int savederrno;
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ARGBEGIN {
default:
usage();
} ARGEND;
if (argc < 1)
usage();
if (getpgrp() == getpid()) {
switch (fork()) {
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case -1:
eprintf("fork:");
case 0:
break;
default:
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return 0;
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}
}
if (setsid() < 0)
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eprintf("setsid:");
execvp(argv[0], argv);
savederrno = errno;
weprintf("execvp %s:", argv[0]);
return (savederrno == ENOENT) ? 127 : 126;
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}