Fix: comparison of unsigned enum expression >= 0

[lttng-tools.git] / src / common / ust-consumer / ust-consumer.c

diff --git a/src/common/ust-consumer/ust-consumer.c b/src/common/ust-consumer/ust-consumer.c
index df0911c7130c4995fc617acc0994a4366efcf03e..1a7b2cd4b5a01edd85cf83569d69109d454b6698 100644 (file)
--- 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;
                }
@@ -2262,14 +2264,14 @@ int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx,
 
        health_code_update();
 
-       ret_code = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket,
+       ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket,
                        key, offset, len, channel, timer, wait);
-       if (ret_code >= 0) {
+       if (ret >= 0) {
                /*
                 * Only send the status msg if the sessiond is alive meaning a positive
                 * ret code.
                 */
-               (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret_code);
+               (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret);
        }
        ret = 0;