From: kfraser@localhost.localdomain <kfraser@localhost.localdomain>
Date: Mon, 31 Jul 2006 17:07:25 +0000 (+0100)
Subject: [BLKTAP] Properly daemonise the blktap control daemon. Fixes bug #709.
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~15754^2~33
X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https:/%22bookmarks://%22Dat/%22http:/www.example.com/cgi/%22https:/%22bookmarks:/%22Dat?a=commitdiff_plain;h=31c8886dc2adf4fb0bda8bb09b342080518e0fe4;p=xen.git

[BLKTAP] Properly daemonise the blktap control daemon. Fixes bug #709.
Signed-off-by: Harry Butterworth <butterwo@uk.ibm.com>
---

diff --git a/tools/blktap/drivers/blktapctrl.c b/tools/blktap/drivers/blktapctrl.c
index f4ade5b780..14a86d9088 100644
--- a/tools/blktap/drivers/blktapctrl.c
+++ b/tools/blktap/drivers/blktapctrl.c
@@ -622,6 +622,38 @@ static void print_drivers(void)
 		DPRINTF("Found driver: [%s]\n",dtypes[i]->name);
 } 
 
+/* Stevens. */
+static void daemonize(void)
+{
+	pid_t pid;
+
+	/* Separate from our parent via fork, so init inherits us. */
+	if ((pid = fork()) < 0)
+		DPRINTF("Failed to fork daemon\n");
+	if (pid != 0)
+		exit(0);
+
+	/* Session leader so ^C doesn't whack us. */
+	setsid();
+
+	/* Let session leader exit so child cannot regain CTTY */
+	if ((pid = fork()) < 0)
+		DPRINTF("Failed to fork daemon\n");
+	if (pid != 0)
+		exit(0);
+
+	/* Move off any mount points we might be in. */
+	if (chdir("/") == -1)
+		DPRINTF("Failed to chdir\n");
+
+	/* Discard our parent's old-fashioned umask prejudices. */
+	umask(0);
+
+	close(STDIN_FILENO);
+	close(STDOUT_FILENO);
+	close(STDERR_FILENO);
+}
+
 int main(int argc, char *argv[])
 {
 	char *devname;
@@ -633,6 +665,7 @@ int main(int argc, char *argv[])
 
 	__init_blkif();
 	openlog("BLKTAPCTRL", LOG_CONS|LOG_ODELAY, LOG_DAEMON);
+	daemonize();
 
 	print_drivers();
 	init_driver_list();