From 8d4f9d241cdbd71a882a852c6e9285de279c0f87 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Sun, 18 Jan 2009 13:00:12 +0100 Subject: v4l2spec: add version 0.24 of the spec From: Hans Verkuil Priority: normal Signed-off-by: Hans Verkuil --- v4l2-spec/func-munmap.sgml | 83 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 v4l2-spec/func-munmap.sgml (limited to 'v4l2-spec/func-munmap.sgml') diff --git a/v4l2-spec/func-munmap.sgml b/v4l2-spec/func-munmap.sgml new file mode 100644 index 000000000..502ed4932 --- /dev/null +++ b/v4l2-spec/func-munmap.sgml @@ -0,0 +1,83 @@ + + + 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. + + + + + + + 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