X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fust-consumer%2Fust-consumer.c;h=c6bd5196b4b6cec77e93f7df4af1e076ed952f07;hp=df0911c7130c4995fc617acc0994a4366efcf03e;hb=6cd525e813795a1d5e38feac8dedf2c73ffb1274;hpb=51a9e1c7f7fd48e2b53e258aee269a69cb8b59d3

diff --git a/src/common/ust-consumer/ust-consumer.c b/src/common/ust-consumer/ust-consumer.c
index df0911c71..c6bd5196b 100644
--- a/src/common/ust-consumer/ust-consumer.c
+++ b/src/common/ust-consumer/ust-consumer.c
@@ -1881,14 +1881,16 @@ int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
 	/* Ease our life for what's next. */
 	ustream = stream->ustream;
 
-	/* We can consume the 1 byte written into the wait_fd by UST */
+	/*
+	 * We can consume the 1 byte written into the wait_fd by UST.
+	 * Don't trigger error if we cannot read this one byte (read
+	 * returns 0), or if the error is EAGAIN or EWOULDBLOCK.
+	 */
 	if (stream->monitor && !stream->hangup_flush_done) {
 		ssize_t readlen;
 
-		do {
-			readlen = read(stream->wait_fd, &dummy, 1);
-		} while (readlen == -1 && errno == EINTR);
-		if (readlen == -1 && errno != EAGAIN && errno != EWOULDBLOCK) {
+		readlen = lttng_read(stream->wait_fd, &dummy, 1);
+		if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) {
 			ret = readlen;
 			goto end;
 		}