path: root/samples
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authorDavid Howells <>2020-01-14 17:07:11 +0000
committerDavid Howells <>2020-05-19 15:38:18 +0100
commit8cfba76383e902acbed95092163052b1572f17a8 (patch)
treef454a431df62749357767cf70feba3c2022b5cb0 /samples
parentf5b5a164f9a11aab5b225f082b33a8f03c07516c (diff)
pipe: Allow buffers to be marked read-whole-or-error for notifications
Allow a buffer to be marked such that read() must return the entire buffer in one go or return ENOBUFS. Multiple buffers can be amalgamated into a single read, but a short read will occur if the next "whole" buffer won't fit. This is useful for watch queue notifications to make sure we don't split a notification across multiple reads, especially given that we need to fabricate an overrun record under some circumstances - and that isn't in the buffers. Signed-off-by: David Howells <>
Diffstat (limited to 'samples')
1 files changed, 1 insertions, 1 deletions
diff --git a/samples/watch_queue/watch_test.c b/samples/watch_queue/watch_test.c
index 4a311790d4ca..8628b4c5d567 100644
--- a/samples/watch_queue/watch_test.c
+++ b/samples/watch_queue/watch_test.c
@@ -63,7 +63,7 @@ static void saw_key_change(struct watch_notification *n, size_t len)
static void consumer(int fd)
- unsigned char buffer[4096], *p, *end;
+ unsigned char buffer[433], *p, *end;
union {
struct watch_notification n;
unsigned char buf1[128];