allow ZT_GETPARAMS to return the master channel number for a channel

git-svn-id: http://svn.digium.com/svn/zaptel/trunk@780 5390a7c7-147a-4af0-8ec9-7488f05a26cb

1 files changed, 13 insertions, 1 deletions

diff --git a/zaptel.c b/zaptel.c
index c3096b1..6a68ffe 100755
--- a/zaptel.c
+++ b/zaptel.c
@@ -2754,10 +2754,18 @@ static int zt_common_ioctl(struct inode *node, struct file *file, unsigned int c
 	unsigned long flags;
 #endif	
 	int i,j;
+	int return_master = 0;
 
 	switch(cmd) {
 	case ZT_GET_PARAMS: /* get channel timing parameters */
 		copy_from_user(&stack.param,(struct zt_params *)data,sizeof(stack.param));
+
+		/* check to see if the caller wants to receive our master channel number */
+		if (stack.param.channo & 0x40000000) {
+			return_master = 1;
+			stack.param.channo &= ~0x40000000;
+		}
+
 		/* Pick the right channo's */
 		if (!stack.param.channo || unit) {
 			stack.param.channo = unit;
@@ -2766,7 +2774,11 @@ static int zt_common_ioctl(struct inode *node, struct file *file, unsigned int c
 		VALID_CHANNEL(stack.param.channo);
 		chan = chans[stack.param.channo];
 
-		  /* point to relevant structure */
+		/* if requested, put the master channel number in the top 16 bits of the result */
+		if (return_master)
+			stack.param.channo |= chan->master->channo << 16;
+
+		/* point to relevant structure */
 		stack.param.sigtype = chan->sig;  /* get signalling type */
 		/* return non-zero if rx not in idle state */
 		if (chan->span) {