report ioctl errors

1 files changed, 8 insertions, 1 deletions

diff --git a/src/ftcat.c b/src/ftcat.c
index 0116fc3..685f65b 100644
--- a/src/ftcat.c
+++ b/src/ftcat.c
@@ -54,6 +54,7 @@ static int disable_all(int fd)
 static int enable_event(int fd, char* str)
 {
         cmd_t   *id;
+        int err;
 
         id = ids + event_count;
         if (!str2event(str, id)) {
@@ -62,7 +63,13 @@ static int enable_event(int fd, char* str)
         }
         event_count += 1;
 
-        return ioctl(fd, ENABLE_CMD, *id) == 0;
+        err = ioctl(fd, ENABLE_CMD, *id);
+
+        if (err < 0)
+                printf("ioctl(%d, %d, %d) => %d (errno: %d)\n", fd, (int) ENABLE_CMD, *id,
+                       err, errno);
+
+        return err == 0;
 }