7.65. V4L2 munmap()¶
v4l2-munmap - Unmap device memory
#include <unistd.h> #include <sys/mman.h>
int munmap(void *start, size_t length)¶
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.
7.65.5. Return Value¶
munmap() returns 0, on failure -1 and the
errno variable is set appropriately:
lengthis incorrect, or no buffers have been mapped yet.