7.66. V4L2 munmap()¶
v4l2-munmap - Unmap device memory
- Address of the mapped buffer as returned by the
- Length of the mapped buffer. This must be the same value as given to
mmap()and returned by the driver in the struct
lengthfield for the single-planar API and in the struct
lengthfield for the multi-planar API.
Unmaps a previously with the
mmap() function mapped
buffer and frees it, if possible.
7.66.5. Return Value¶
munmap() returns 0, on failure -1 and the
errno variable is set appropriately:
lengthis incorrect, or no buffers have been mapped yet.