ia64/xen-unstable

changeset 10885:6d44ab88d941

[BLKTAP] Properly daemonise the blktap control daemon. Fixes bug #709.
Signed-off-by: Harry Butterworth <butterwo@uk.ibm.com>
author kfraser@localhost.localdomain
date Mon Jul 31 18:07:25 2006 +0100 (2006-07-31)
parents 637fa5352fad
children 3fae79942240
files tools/blktap/drivers/blktapctrl.c
line diff
     1.1 --- a/tools/blktap/drivers/blktapctrl.c	Mon Jul 31 17:49:36 2006 +0100
     1.2 +++ b/tools/blktap/drivers/blktapctrl.c	Mon Jul 31 18:07:25 2006 +0100
     1.3 @@ -622,6 +622,38 @@ static void print_drivers(void)
     1.4  		DPRINTF("Found driver: [%s]\n",dtypes[i]->name);
     1.5  } 
     1.6  
     1.7 +/* Stevens. */
     1.8 +static void daemonize(void)
     1.9 +{
    1.10 +	pid_t pid;
    1.11 +
    1.12 +	/* Separate from our parent via fork, so init inherits us. */
    1.13 +	if ((pid = fork()) < 0)
    1.14 +		DPRINTF("Failed to fork daemon\n");
    1.15 +	if (pid != 0)
    1.16 +		exit(0);
    1.17 +
    1.18 +	/* Session leader so ^C doesn't whack us. */
    1.19 +	setsid();
    1.20 +
    1.21 +	/* Let session leader exit so child cannot regain CTTY */
    1.22 +	if ((pid = fork()) < 0)
    1.23 +		DPRINTF("Failed to fork daemon\n");
    1.24 +	if (pid != 0)
    1.25 +		exit(0);
    1.26 +
    1.27 +	/* Move off any mount points we might be in. */
    1.28 +	if (chdir("/") == -1)
    1.29 +		DPRINTF("Failed to chdir\n");
    1.30 +
    1.31 +	/* Discard our parent's old-fashioned umask prejudices. */
    1.32 +	umask(0);
    1.33 +
    1.34 +	close(STDIN_FILENO);
    1.35 +	close(STDOUT_FILENO);
    1.36 +	close(STDERR_FILENO);
    1.37 +}
    1.38 +
    1.39  int main(int argc, char *argv[])
    1.40  {
    1.41  	char *devname;
    1.42 @@ -633,6 +665,7 @@ int main(int argc, char *argv[])
    1.43  
    1.44  	__init_blkif();
    1.45  	openlog("BLKTAPCTRL", LOG_CONS|LOG_ODELAY, LOG_DAEMON);
    1.46 +	daemonize();
    1.47  
    1.48  	print_drivers();
    1.49  	init_driver_list();