X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fust-consumer%2Fust-consumer.c;h=c8ba084606180790b51fc7d11ba8ea5075f019c4;hp=e81f05041249a164ce09151e9907c0602b41d6be;hb=1af0e2e4d4a770e32f4fc169122b0c338bd799f6;hpb=1d76b9222464f9e10128ae867cd56a9317da5d65

diff --git a/src/common/ust-consumer/ust-consumer.c b/src/common/ust-consumer/ust-consumer.c
index e81f05041..c8ba08460 100644
--- a/src/common/ust-consumer/ust-consumer.c
+++ b/src/common/ust-consumer/ust-consumer.c
@@ -43,9 +43,9 @@ extern volatile int consumer_quit;
 /*
  * Mmap the ring buffer, read it and write the data to the tracefile.
  *
- * Returns the number of bytes written
+ * Returns the number of bytes written, else negative value on error.
  */
-int lttng_ustconsumer_on_read_subbuffer_mmap(
+ssize_t lttng_ustconsumer_on_read_subbuffer_mmap(
 		struct lttng_consumer_local_data *ctx,
 		struct lttng_consumer_stream *stream, unsigned long len)
 {
@@ -58,7 +58,7 @@ int lttng_ustconsumer_on_read_subbuffer_mmap(
 	ret = ustctl_get_mmap_read_offset(stream->chan->handle,
 		stream->buf, &mmap_offset);
 	if (ret != 0) {
-		ret = -errno;
+		errno = -ret;
 		perror("ustctl_get_mmap_read_offset");
 		goto end;
 	}
@@ -67,7 +67,7 @@ int lttng_ustconsumer_on_read_subbuffer_mmap(
 		if (ret >= len) {
 			len = 0;
 		} else if (ret < 0) {
-			ret = -errno;
+			errno = -ret;
 			perror("Error in file write");
 			goto end;
 		}
@@ -90,7 +90,7 @@ end:
  *
  * Returns the number of bytes spliced.
  */
-int lttng_ustconsumer_on_read_subbuffer_splice(
+ssize_t lttng_ustconsumer_on_read_subbuffer_splice(
 		struct lttng_consumer_local_data *ctx,
 		struct lttng_consumer_stream *stream, unsigned long len)
 {
@@ -109,7 +109,7 @@ int lttng_ustconsumer_take_snapshot(struct lttng_consumer_local_data *ctx,
 
 	ret = ustctl_snapshot(stream->chan->handle, stream->buf);
 	if (ret != 0) {
-		ret = errno;
+		errno = -ret;
 		perror("Getting sub-buffer snapshot.");
 	}
 
@@ -131,7 +131,7 @@ int lttng_ustconsumer_get_produced_snapshot(
 	ret = ustctl_snapshot_get_produced(stream->chan->handle,
 			stream->buf, pos);
 	if (ret != 0) {
-		ret = errno;
+		errno = -ret;
 		perror("kernctl_snapshot_get_produced");
 	}
 
@@ -347,7 +347,7 @@ int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
 	if (!stream->hangup_flush_done) {
 		do {
 			readlen = read(stream->wait_fd, &dummy, 1);
-		} while (readlen == -1 && errno == -EINTR);
+		} while (readlen == -1 && errno == EINTR);
 		if (readlen == -1) {
 			ret = readlen;
 			goto end;