libv4l2: Support non-blocking mode for dqbuf

When dqbuf() return -EAGAIN, this is not error at non-blocking mode.

Change-Id: I84a0629dc442b9a13fda08451334f90f84c86f6e
Signed-off-by: Hyeonmyeong Choi <hyeon.choi@samsung.com>

diff --git a/libv4l2/exynos_v4l2.c b/libv4l2/exynos_v4l2.c
index 842d1bac3aaf768093cf2e0a4c43f0db26486c18..c737c07d77dd1ad9157d6b35a7473973f52fbce0 100644 (file)
--- a/libv4l2/exynos_v4l2.c
+++ b/libv4l2/exynos_v4l2.c
@@ -541,6 +541,9 @@ int exynos_v4l2_dqbuf(int fd, struct v4l2_buffer *buf)
 
     ret = ioctl(fd, VIDIOC_DQBUF, buf);
     if (ret) {
+        if (errno == EAGAIN)
+            return -errno;
+
         ALOGW("failed to ioctl: VIDIOC_DQBUF (%d - %s)", errno, strerror(errno));
         return ret;
     }