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68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Rexec program for system have fork() as vfork() with foreground option
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*
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* Copyright (C) Vladimir N. Oleynik <dzo@simtreas.ru>
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* Copyright (C) 2003 Russ Dill <Russ.Dill@asu.edu>
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*
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* daemon() portion taken from uClibc:
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*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Modified for uClibc by Erik Andersen <andersee@debian.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <paths.h>
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#include "libbb.h"
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#ifdef BB_NOMMU
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void vfork_daemon_rexec(int nochdir, int noclose,
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int argc, char **argv, char *foreground_opt)
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{
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int fd;
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char **vfork_args;
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int a = 0;
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setsid();
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if (!nochdir)
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xchdir("/");
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if (!noclose && (fd = open(bb_dev_null, O_RDWR, 0)) != -1) {
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dup2(fd, STDIN_FILENO);
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dup2(fd, STDOUT_FILENO);
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dup2(fd, STDERR_FILENO);
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if (fd > 2)
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close(fd);
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}
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vfork_args = xcalloc(sizeof(char *), argc + 3);
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vfork_args[a++] = CONFIG_BUSYBOX_EXEC_PATH;
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while(*argv) {
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vfork_args[a++] = *argv;
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argv++;
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}
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vfork_args[a] = foreground_opt;
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switch (vfork()) {
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case 0: /* child */
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/* Make certain we are not a session leader, or else we
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* might reacquire a controlling terminal */
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if (vfork())
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_exit(0);
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execv(vfork_args[0], vfork_args);
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bb_perror_msg_and_die("execv %s", vfork_args[0]);
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case -1: /* error */
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bb_perror_msg_and_die("vfork");
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default: /* parent */
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exit(0);
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}
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}
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#endif /* BB_NOMMU */
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