diff options
Diffstat (limited to 'v4l2-apps/libv4l')
| -rw-r--r-- | v4l2-apps/libv4l/include/libv4l2.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/v4l2-apps/libv4l/include/libv4l2.h b/v4l2-apps/libv4l/include/libv4l2.h index 5488b2b10..dfae21471 100644 --- a/v4l2-apps/libv4l/include/libv4l2.h +++ b/v4l2-apps/libv4l/include/libv4l2.h @@ -51,6 +51,13 @@ LIBV4L_PUBLIC extern FILE *v4l2_log_file; Note the device name passed to v4l2_open must be of a video4linux2 device, if it is anything else (including a video4linux1 device), v4l2_open will fail. + + Note that the argument to v4l2_ioctl after the request must be a valid + memory address of structure of the appropriate type for the request (for + v4l2 requests which expect a structure address). Passing in NULL or an + invalid memory address will not lead to failure with errno being EFAULT, + as it would with a real ioctl, but will cause libv4l2 to break, and you + get to keep both pieces. */ LIBV4L_PUBLIC int v4l2_open (const char *file, int oflag, ...); |