From e2dda7d1aa5b00505b84186b7e7c9626eae94660 Mon Sep 17 00:00:00 2001
From: Michael Warfield <mhw@samba.org>
Date: Mon, 1 Feb 1999 22:03:11 +0000
Subject: `

---
 source/client/smbmount.c  | 73 +++++++++++++++++++++++++++++++++++------------
 source/client/smbumount.c |  8 ++++++
 2 files changed, 63 insertions(+), 18 deletions(-)

diff --git a/source/client/smbmount.c b/source/client/smbmount.c
index 430e498d937..00331f36819 100644
--- a/source/client/smbmount.c
+++ b/source/client/smbmount.c
@@ -38,7 +38,7 @@ static struct smb_conn_opt conn_options;
 #endif
 
 /* Uncomment this to allow debug the smbmount daemon */
-#define SMBFS_DEBUG 1
+/* #define SMBFS_DEBUG 1 */
 
 pstring cur_dir = "\\";
 pstring cd_path = "";
@@ -71,7 +71,6 @@ extern int name_type;
 extern int max_protocol;
 int port = SMB_PORT;
 
-
 time_t newer_than = 0;
 int archive_level = 0;
 
@@ -181,20 +180,51 @@ static BOOL chkpath(char *path,BOOL report)
   return(CVAL(inbuf,smb_rcls) == 0);
 }
 
+static void
+exit_parent( int sig )
+{
+	/* parent simply exits when child says go... */
+	exit(0);
+}
+
 static void
 daemonize(void)
 {
-	int i;
-	if ((i = fork()) < 0)
+	int j, status;
+	pid_t child_pid;
+
+	signal( SIGTERM, exit_parent );
+
+	if ((child_pid = fork()) < 0)
 	{
 		DEBUG(0, ("could not fork\n"));
 	}
-	if (i > 0)
+	if (child_pid > 0)
 	{
-		/* parent simply exits */
-		exit(0);
+		while( 1 ) {
+			j = waitpid( child_pid, &status, 0 );
+			if( j < 0 ) {
+				if( EINTR == errno ) {
+					continue;
+				}
+				status = errno;
+			}
+			break;
+		}
+		/* If we get here - the child exited with some error status */
+		exit(status);
 	}
-	setsid();
+	/* Programmers Note:
+		Danger Will Robinson!  Danger!
+
+		There use to be a call to setsid() here.  This does no
+		harm to normal mount operations, but it broke automounting.
+		The setsid call has been moved to just before the child
+		sends the SIGTERM to the parent.  All of our deadly embrace
+		conditions with autofs will have been cleared by then...
+		-mhw-
+	*/
+	signal( SIGTERM, SIG_DFL );
 	chdir("/");
 }
 
@@ -255,7 +285,8 @@ static void
 send_fs_socket(char *mount_point, char *inbuf, char *outbuf)
 {
 	int fd, closed = 0, res = 1;
-	int first_time = 1;
+
+	pid_t parentpid = getppid();
 
 	while (1)
 	{
@@ -278,6 +309,15 @@ send_fs_socket(char *mount_point, char *inbuf, char *outbuf)
 			DEBUG(0, ("smbmount: ioctl failed, res=%d\n", res));
 		}
 
+		if( parentpid ) {
+			/* Ok...  We are going to kill the parent.  Now
+				is the time to break the process group... */
+			setsid();
+			/* Send a signal to the parent to terminate */
+			kill( parentpid, SIGTERM );
+			parentpid = 0;
+		}
+
 		close_sockets();
 		close(fd);
 		/*
@@ -291,15 +331,6 @@ send_fs_socket(char *mount_point, char *inbuf, char *outbuf)
 		}
 #endif
 
-		if( first_time ) {
-	/*
-	 * Create the background process after trying the mount.
-	 * to avoid race conditions with automount and other processes.
-	 */
-			first_time = 0;
-			daemonize();
-		}
-
 		/*
 		 * Wait for a signal from smbfs ...
 		 */
@@ -368,6 +399,12 @@ static void cmd_mount(char *inbuf,char *outbuf)
 
 	DEBUG(3, ("mount command: %s\n", mount_command));
 
+	/*
+		Set up to return as a daemon child and wait in the parent
+		until the child say it's ready...
+	*/
+	daemonize();
+
 	if ((retval = system(mount_command)) != 0)
 	{
 		DEBUG(0,("mount failed\n"));
diff --git a/source/client/smbumount.c b/source/client/smbumount.c
index 5e072274c95..84188542e59 100644
--- a/source/client/smbumount.c
+++ b/source/client/smbumount.c
@@ -15,6 +15,14 @@
 #include <linux/smb_mount.h>
 #include <linux/smb_fs.h>
 
+/* This is a (hopefully) temporary hack due to the fact that
+	sizeof( uid_t ) != sizeof( __kernel_uid_t ) under glibc.
+	This may change in the future and smb.h may get fixed in the
+	future.  In the mean time, it's ugly hack time - get over it.
+*/
+#undef SMB_IOC_GETMOUNTUID
+#define	SMB_IOC_GETMOUNTUID		_IOR('u', 1, __kernel_uid_t)
+
 static char *progname;
 
 static void
-- 
cgit