From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001 From: root Date: Fri, 25 Dec 2015 04:40:36 +0000 Subject: initial_commit --- Documentation/DocBook/v4l/func-munmap.xml | 84 +++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 Documentation/DocBook/v4l/func-munmap.xml (limited to 'Documentation/DocBook/v4l/func-munmap.xml') diff --git a/Documentation/DocBook/v4l/func-munmap.xml b/Documentation/DocBook/v4l/func-munmap.xml new file mode 100644 index 00000000..e2c4190f --- /dev/null +++ b/Documentation/DocBook/v4l/func-munmap.xml @@ -0,0 +1,84 @@ + + + V4L2 munmap() + &manvol; + + + + v4l2-munmap + Unmap device memory + + + + + +#include <unistd.h> +#include <sys/mman.h> + + int munmap + void *start + size_t length + + + + + Arguments + + + start + + Address of the mapped buffer as returned by the +&func-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 &v4l2-buffer; length +field for the single-planar API and in the &v4l2-plane; +length field for the multi-planar API. + + + + + + + Description + + Unmaps a previously with the &func-mmap; function mapped +buffer and frees it, if possible. + + + + 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. + + + + + + + -- cgit v1.2.3