8.64. V4L2 munmap()
8.64.1. Name
v4l2-munmap - Unmap device memory
8.64.2. Synopsis
#include <unistd.h>
#include <sys/mman.h>
-
int munmap(void *start, size_t length)
8.64.3. Arguments
- start
- Address of the mapped buffer as returned by the
mmap() function.
- length
- Length of the mapped buffer. This must be the same value as given to
mmap() and returned by the driver in the struct
v4l2_buffer length field for the
single-planar API and in the struct
v4l2_plane length field for the
multi-planar API.
8.64.4. Description
Unmaps a previously with the mmap() function mapped
buffer and frees it, if possible.
8.64.5. Return Value
On success munmap() returns 0, on failure -1 and the
errno variable is set appropriately:
- EINVAL
- The start or length is incorrect, or no buffers have been
mapped yet.