After i915 commit:
commit bd008e5b2953186fc0c6633a885ade95e7043800
Author: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Date: Tue Oct 7 14:13:51 2014 +0100
drm: Implement O_NONBLOCK support on /dev/dri/cardN
the return value for drm short_buffer read is -1 and errno is
EAGAIN.
Signed-off-by: Xiong Zhang <xiong.y.zhang@xxxxxxxxx>
---
tests/drm_read.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/tests/drm_read.c b/tests/drm_read.c
index 334f26a..a17d981 100644
--- a/tests/drm_read.c
+++ b/tests/drm_read.c
@@ -145,7 +145,8 @@ static void test_short_buffer(int in, int nonblock)
alarm(3);
- igt_assert_eq(read(fd, buffer, 4), 0);
+ igt_assert_eq(read(fd, buffer, 4), -1);
+ igt_assert_eq(errno, EAGAIN);
igt_assert(read(fd, buffer, 40) > 0);
igt_assert(read(fd, buffer, 40) > 0);
--
1.7.9.5
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