License header fixes

[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 9a5775b8ed3bff1bf996dc244516b1dce2685257..bfdb7e968fe9aa77ba9ad922e8fb6bf8748f4353 100644 (file)
--- a/src/common/ust-consumer/ust-consumer.c
+++ b/src/common/ust-consumer/ust-consumer.c
@@ -2,24 +2,22 @@
  * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
  *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; only version 2
- * of the License.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2 only,
+ * as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #define _GNU_SOURCE
 #include <assert.h>
-#include <fcntl.h>
 #include <poll.h>
 #include <pthread.h>
 #include <stdlib.h>
@@ -44,9 +42,9 @@ 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)
 {
@@ -59,8 +57,8 @@ 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;
-               perror("ustctl_get_mmap_read_offset");
+               errno = -ret;
+               PERROR("ustctl_get_mmap_read_offset");
                goto end;
        }
        while (len > 0) {
@@ -68,8 +66,8 @@ int lttng_ustconsumer_on_read_subbuffer_mmap(
                if (ret >= len) {
                        len = 0;
                } else if (ret < 0) {
-                       ret = -errno;
-                       perror("Error in file write");
+                       errno = -ret;
+                       PERROR("Error in file write");
                        goto end;
                }
                /* This won't block, but will start writeout asynchronously */
@@ -91,7 +89,7 @@ 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)
 {
@@ -110,8 +108,8 @@ int lttng_ustconsumer_take_snapshot(struct lttng_consumer_local_data *ctx,
 
        ret = ustctl_snapshot(stream->chan->handle, stream->buf);
        if (ret != 0) {
-               ret = errno;
-               perror("Getting sub-buffer snapshot.");
+               errno = -ret;
+               PERROR("Getting sub-buffer snapshot.");
        }
 
        return ret;
@@ -132,8 +130,8 @@ int lttng_ustconsumer_get_produced_snapshot(
        ret = ustctl_snapshot_get_produced(stream->chan->handle,
                        stream->buf, pos);
        if (ret != 0) {
-               ret = errno;
-               perror("kernctl_snapshot_get_produced");
+               errno = -ret;
+               PERROR("kernctl_snapshot_get_produced");
        }
 
        return ret;
@@ -262,7 +260,7 @@ end:
        /* signal the poll thread */
        ret = write(ctx->consumer_poll_pipe[1], "4", 1);
        if (ret < 0) {
-               perror("write consumer poll");
+               PERROR("write consumer poll");
        }
 end_nosignal:
        return 0;
@@ -348,7 +346,7 @@ 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;
@@ -402,7 +400,7 @@ int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream)
                                stream->uid, stream->gid);
                if (ret < 0) {
                        ERR("Opening %s", stream->path_name);
-                       perror("open");
+                       PERROR("open");
                        goto error;
                }
                stream->out_fd = ret;