Get vfork_daemon_rexec working under uclinux

1 files changed, 57 insertions, 6 deletions

diff --git a/libbb/vfork_daemon_rexec.c b/libbb/vfork_daemon_rexec.c
index c8f9d27..2fd70ba 100644
--- a/libbb/vfork_daemon_rexec.c
+++ b/libbb/vfork_daemon_rexec.c
@@ -1,27 +1,78 @@
 /*
  * Rexec program for system have fork() as vfork() with foregound option
- * Copyright (C) Vladminr Oleynik and many different people.
+ *
+ * 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 argc, char **argv, char *foreground_opt)
+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;
-	execvp("/proc/self/exe", vfork_args);
-	vfork_args[0] = "/bin/busybox";
-	execv(vfork_args[0], vfork_args);
-	bb_perror_msg_and_die("execv %s", vfork_args[0]);
+	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 */