librdmacm/examples: Rename create_first_event_channel, drop first

This function just creates an event channel and prints a couple
of error messages on failure.  It has no concept of being the
'first' event channel, except by the caller's use.

Replace direct calls to rdma_create_event_channel() in the
example code with this call to make use of the existing error
messages.

Signed-off-by: Sean Hefty <shefty@nvidia.com>

librdmacm/examples/cmatose.c

@@ -486,11 +486,9 @@ static int migrate_channel(struct rdma_cm_id *listen_id)
 
 	printf("migrating to new event channel\n");
 
-	channel = rdma_create_event_channel();
-	if (!channel) {
-		perror("cmatose: failed to create event channel");
+	channel = create_event_channel();
+	if (!channel)
 		return -1;
-	}
 
 	ret = 0;
 	if (listen_id)
@@ -715,7 +713,7 @@ int main(int argc, char **argv)
 
 	test.connects_left = connections;
 
-	test.channel = create_first_event_channel();
+	test.channel = create_event_channel();
 	if (!test.channel) {
 		exit(1);
 	}

librdmacm/examples/cmtime.c

@@ -649,9 +649,9 @@ int main(int argc, char **argv)
 	if (ret)
 		goto out;
 
-	channel = create_first_event_channel();
+	channel = create_event_channel();
 	if (!channel) {
-		ret = -ENOMEM;
+		ret = -errno;
 		goto freeinfo;
 	}
 

librdmacm/examples/common.c

@@ -167,7 +167,7 @@ int do_poll(struct pollfd *fds, int timeout)
 	return ret == 1 ? (fds->revents & (POLLERR | POLLHUP)) : ret;
 }
 
-struct rdma_event_channel *create_first_event_channel(void)
+struct rdma_event_channel *create_event_channel(void)
 {
 	struct rdma_event_channel *channel;
 

librdmacm/examples/common.h

@@ -103,4 +103,5 @@ int size_to_count(int size);
 void format_buf(void *buf, int size);
 int verify_buf(void *buf, int size);
 int do_poll(struct pollfd *fds, int timeout);
-struct rdma_event_channel *create_first_event_channel(void);
+
+struct rdma_event_channel *create_event_channel(void);

librdmacm/examples/mckey.c

@@ -651,7 +651,7 @@ int main(int argc, char **argv)
 	test.dst_addr = (struct sockaddr *) &test.dst_in;
 	test.connects_left = connections;
 
-	test.channel = create_first_event_channel();
+	test.channel = create_event_channel();
 	if (!test.channel) {
 		exit(1);
 	}

librdmacm/examples/rping.c

@@ -1362,7 +1362,7 @@ int main(int argc, char *argv[])
 		goto out;
 	}
 
-	cb->cm_channel = create_first_event_channel();
+	cb->cm_channel = create_event_channel();
 	if (!cb->cm_channel) {
 		ret = errno;
 		goto out;

librdmacm/examples/udaddy.c

@@ -671,7 +671,7 @@ int main(int argc, char **argv)
 
 	test.connects_left = connections;
 
-	test.channel = create_first_event_channel();
+	test.channel = create_event_channel();
 	if (!test.channel) {
 		exit(1);
 	}