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authorPawel Osciak <pawel@osciak.com>2011-01-12 05:57:26 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2011-03-21 20:31:35 -0300
commitc4c0a78d459f2e4fcc7c4f3621a34e71ec7970d0 (patch)
tree9bdbd40352a767b5dbec95aee82d514bf65da08e /Documentation
parent08b99e26a347441c50c1113802801a122dd1eb7a (diff)
downloadop-kernel-dev-c4c0a78d459f2e4fcc7c4f3621a34e71ec7970d0.zip
op-kernel-dev-c4c0a78d459f2e4fcc7c4f3621a34e71ec7970d0.tar.gz
[media] Fix mmap() example in the V4L2 API DocBook
Correct ioctl return value handling and fix coding style issues. [mchehab@redhat.com: return -1 is OK, according with ioctl manpages. Reverting ioctl changes] Signed-off-by: Pawel Osciak <pawel@osciak.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/DocBook/v4l/io.xml36
1 files changed, 18 insertions, 18 deletions
diff --git a/Documentation/DocBook/v4l/io.xml b/Documentation/DocBook/v4l/io.xml
index d424886..a975043 100644
--- a/Documentation/DocBook/v4l/io.xml
+++ b/Documentation/DocBook/v4l/io.xml
@@ -141,63 +141,63 @@ struct {
} *buffers;
unsigned int i;
-memset (&amp;reqbuf, 0, sizeof (reqbuf));
+memset(&amp;reqbuf, 0, sizeof(reqbuf));
reqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
reqbuf.memory = V4L2_MEMORY_MMAP;
reqbuf.count = 20;
if (-1 == ioctl (fd, &VIDIOC-REQBUFS;, &amp;reqbuf)) {
if (errno == EINVAL)
- printf ("Video capturing or mmap-streaming is not supported\n");
+ printf("Video capturing or mmap-streaming is not supported\n");
else
- perror ("VIDIOC_REQBUFS");
+ perror("VIDIOC_REQBUFS");
- exit (EXIT_FAILURE);
+ exit(EXIT_FAILURE);
}
/* We want at least five buffers. */
if (reqbuf.count &lt; 5) {
/* You may need to free the buffers here. */
- printf ("Not enough buffer memory\n");
- exit (EXIT_FAILURE);
+ printf("Not enough buffer memory\n");
+ exit(EXIT_FAILURE);
}
-buffers = calloc (reqbuf.count, sizeof (*buffers));
-assert (buffers != NULL);
+buffers = calloc(reqbuf.count, sizeof(*buffers));
+assert(buffers != NULL);
for (i = 0; i &lt; reqbuf.count; i++) {
&v4l2-buffer; buffer;
- memset (&amp;buffer, 0, sizeof (buffer));
+ memset(&amp;buffer, 0, sizeof(buffer));
buffer.type = reqbuf.type;
buffer.memory = V4L2_MEMORY_MMAP;
buffer.index = i;
if (-1 == ioctl (fd, &VIDIOC-QUERYBUF;, &amp;buffer)) {
- perror ("VIDIOC_QUERYBUF");
- exit (EXIT_FAILURE);
+ perror("VIDIOC_QUERYBUF");
+ exit(EXIT_FAILURE);
}
buffers[i].length = buffer.length; /* remember for munmap() */
- buffers[i].start = mmap (NULL, buffer.length,
- PROT_READ | PROT_WRITE, /* recommended */
- MAP_SHARED, /* recommended */
- fd, buffer.m.offset);
+ buffers[i].start = mmap(NULL, buffer.length,
+ PROT_READ | PROT_WRITE, /* recommended */
+ MAP_SHARED, /* recommended */
+ fd, buffer.m.offset);
if (MAP_FAILED == buffers[i].start) {
/* If you do not exit here you should unmap() and free()
the buffers mapped so far. */
- perror ("mmap");
- exit (EXIT_FAILURE);
+ perror("mmap");
+ exit(EXIT_FAILURE);
}
}
/* Cleanup. */
for (i = 0; i &lt; reqbuf.count; i++)
- munmap (buffers[i].start, buffers[i].length);
+ munmap(buffers[i].start, buffers[i].length);
</programlisting>
</example>
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