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v4l2grab: print function name and ioctl number on failure

Message ID 3197193698388412798e8c81d8e30d9a393b670f.1439394992.git.baruch@tkos.co.il (mailing list archive)
State New, archived
Headers show

Commit Message

Baruch Siach Aug. 12, 2015, 3:56 p.m. UTC 
This makes the failure error message a little more useful.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
---
 contrib/test/v4l2grab.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/contrib/test/v4l2grab.c b/contrib/test/v4l2grab.c
index 3e1be3de6353..778c51cc391a 100644
--- a/contrib/test/v4l2grab.c
+++ b/contrib/test/v4l2grab.c
@@ -43,7 +43,8 @@  static void xioctl(int fh, unsigned long int request, void *arg)
 	} while (r == -1 && ((errno == EINTR) || (errno == EAGAIN)));
 
 	if (r == -1) {
-		fprintf(stderr, "error %d, %s\n", errno, strerror(errno));
+		fprintf(stderr, "%s(%lu): error %d, %s\n", __func__,
+			_IOC_NR(request), errno, strerror(errno));
 		exit(EXIT_FAILURE);
 	}
 }