diff options
Diffstat (limited to 'libbb/vfork_daemon_rexec.c')
| -rw-r--r-- | libbb/vfork_daemon_rexec.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/libbb/vfork_daemon_rexec.c b/libbb/vfork_daemon_rexec.c new file mode 100644 index 0000000..ebd32f8 --- /dev/null +++ b/libbb/vfork_daemon_rexec.c @@ -0,0 +1,67 @@ +/* vi: set sw=4 ts=4: */ +/* + * 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> + * + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. + */ + +#include <unistd.h> +#include <stdio.h> +#include <fcntl.h> +#include <paths.h> +#include "libbb.h" + + +#ifdef BB_NOMMU +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) + xchdir("/"); + + if (!noclose && (fd = open(bb_dev_null, 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++] = CONFIG_BUSYBOX_EXEC_PATH; + 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 /* BB_NOMMU */ |