sbase/setsid.c

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/* See LICENSE file for copyright and license details. */
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#include <errno.h>
#include <unistd.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)
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usage();
if (getpgrp() == getpid()) {
switch (fork()) {
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case -1:
weprintf("fork:");
_exit(1);
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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]);
_exit(126 + (savederrno == ENOENT));
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}