diff options
Diffstat (limited to 'busybox/libbb/vfork_daemon_rexec.c')
| -rw-r--r-- | busybox/libbb/vfork_daemon_rexec.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/busybox/libbb/vfork_daemon_rexec.c b/busybox/libbb/vfork_daemon_rexec.c new file mode 100644 index 0000000..80022b3 --- /dev/null +++ b/busybox/libbb/vfork_daemon_rexec.c @@ -0,0 +1,78 @@ +/* + * Rexec program for system have fork() as vfork() with foreground option + * + * Copyright (C) Vladimir N. Oleynik <dzo@simtreas.ru> + * Copyright (C) 2003 Russ Dill <Russ.Dill@asu.edu> + * + * daemon() portion taken from uClibc: + * + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * + * Modified for uClibc by Erik Andersen <andersee@debian.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <unistd.h> +#include <stdio.h> +#include <fcntl.h> +#include <paths.h> +#include "libbb.h" + + +#if defined(__uClinux__) +void vfork_daemon_rexec(int nochdir, int noclose, + int argc, char **argv, char *foreground_opt) +{ + int fd; + char **vfork_args; + int a = 0; + + setsid(); + + if (!nochdir) + chdir("/"); + + if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { + dup2(fd, STDIN_FILENO); + dup2(fd, STDOUT_FILENO); + dup2(fd, STDERR_FILENO); + if (fd > 2) + close(fd); + } + + vfork_args = xcalloc(sizeof(char *), argc + 3); + vfork_args[a++] = "/bin/busybox"; + while(*argv) { + vfork_args[a++] = *argv; + argv++; + } + vfork_args[a] = foreground_opt; + switch (vfork()) { + case 0: /* child */ + /* Make certain we are not a session leader, or else we + * might reacquire a controlling terminal */ + if (vfork()) + _exit(0); + execv(vfork_args[0], vfork_args); + bb_perror_msg_and_die("execv %s", vfork_args[0]); + case -1: /* error */ + bb_perror_msg_and_die("vfork"); + default: /* parent */ + exit(0); + } +} +#endif /* uClinux */ |