Merge branch 'master' of git://git.lttng.org/lttng-tools

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

diff --git a/src/common/kernel-consumer/kernel-consumer.c b/src/common/kernel-consumer/kernel-consumer.c
index f32f47b3eeb1f6faf6b615700529dea5e990c7e5..823b4a28aa9df3934df86e55b09c3469857631fc 100644 (file)
--- a/src/common/kernel-consumer/kernel-consumer.c
+++ b/src/common/kernel-consumer/kernel-consumer.c
@@ -45,12 +45,12 @@ extern volatile int consumer_quit;
  *
  * Returns the number of bytes written
  */
-int lttng_kconsumer_on_read_subbuffer_mmap(
+ssize_t lttng_kconsumer_on_read_subbuffer_mmap(
                struct lttng_consumer_local_data *ctx,
                struct lttng_consumer_stream *stream, unsigned long len)
 {
        unsigned long mmap_offset;
-       long ret = 0;
+       ssize_t ret = 0;
        off_t orig_offset = stream->out_fd_offset;
        int fd = stream->wait_fd;
        int outfd = stream->out_fd;
@@ -58,7 +58,7 @@ int lttng_kconsumer_on_read_subbuffer_mmap(
        /* get the offset inside the fd to mmap */
        ret = kernctl_get_mmap_read_offset(fd, &mmap_offset);
        if (ret != 0) {
-               ret = -errno;
+               errno = -ret;
                perror("kernctl_get_mmap_read_offset");
                goto end;
        }
@@ -68,7 +68,7 @@ int lttng_kconsumer_on_read_subbuffer_mmap(
                if (ret >= len) {
                        len = 0;
                } else if (ret < 0) {
-                       ret = -errno;
+                       errno = -ret;
                        perror("Error in file write");
                        goto end;
                }
@@ -91,11 +91,11 @@ end:
  *
  * Returns the number of bytes spliced.
  */
-int lttng_kconsumer_on_read_subbuffer_splice(
+ssize_t lttng_kconsumer_on_read_subbuffer_splice(
                struct lttng_consumer_local_data *ctx,
                struct lttng_consumer_stream *stream, unsigned long len)
 {
-       long ret = 0;
+       ssize_t ret = 0;
        loff_t offset = 0;
        off_t orig_offset = stream->out_fd_offset;
        int fd = stream->wait_fd;
@@ -106,18 +106,18 @@ int lttng_kconsumer_on_read_subbuffer_splice(
                                (unsigned long)offset, fd);
                ret = splice(fd, &offset, ctx->consumer_thread_pipe[1], NULL, len,
                                SPLICE_F_MOVE | SPLICE_F_MORE);
-               DBG("splice chan to pipe ret %ld", ret);
+               DBG("splice chan to pipe ret %zd", ret);
                if (ret < 0) {
-                       ret = errno;
+                       errno = -ret;
                        perror("Error in relay splice");
                        goto splice_error;
                }
 
                ret = splice(ctx->consumer_thread_pipe[0], NULL, outfd, NULL, ret,
                                SPLICE_F_MOVE | SPLICE_F_MORE);
-               DBG("splice pipe to file %ld", ret);
+               DBG("splice pipe to file %zd", ret);
                if (ret < 0) {
-                       ret = errno;
+                       errno = -ret;
                        perror("Error in file splice");
                        goto splice_error;
                }
@@ -165,7 +165,7 @@ int lttng_kconsumer_take_snapshot(struct lttng_consumer_local_data *ctx,
 
        ret = kernctl_snapshot(infd);
        if (ret != 0) {
-               ret = errno;
+               errno = -ret;
                perror("Getting sub-buffer snapshot.");
        }
 
@@ -187,7 +187,7 @@ int lttng_kconsumer_get_produced_snapshot(
 
        ret = kernctl_snapshot_get_produced(infd, pos);
        if (ret != 0) {
-               ret = errno;
+               errno = -ret;
                perror("kernctl_snapshot_get_produced");
        }
 
@@ -308,19 +308,18 @@ end_nosignal:
 /*
  * Consume data on a file descriptor and write it on a trace file.
  */
-int lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
+ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
                struct lttng_consumer_local_data *ctx)
 {
        unsigned long len;
        int err;
-       long ret = 0;
+       ssize_t ret = 0;
        int infd = stream->wait_fd;
 
        DBG("In read_subbuffer (infd : %d)", infd);
        /* Get the next subbuffer */
        err = kernctl_get_next_subbuf(infd);
        if (err != 0) {
-               ret = errno;
                /*
                 * This is a debug message even for single-threaded consumer,
                 * because poll() have more relaxed criterions than get subbuf,
@@ -337,7 +336,7 @@ int lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
                        /* read the whole subbuffer */
                        err = kernctl_get_padded_subbuf_size(infd, &len);
                        if (err != 0) {
-                               ret = errno;
+                               errno = -ret;
                                perror("Getting sub-buffer len failed.");
                                goto end;
                        }
@@ -356,7 +355,7 @@ int lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
                        /* read the used subbuffer size */
                        err = kernctl_get_padded_subbuf_size(infd, &len);
                        if (err != 0) {
-                               ret = errno;
+                               errno = -ret;
                                perror("Getting sub-buffer len failed.");
                                goto end;
                        }
@@ -377,7 +376,7 @@ int lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
 
        err = kernctl_put_next_subbuf(infd);
        if (err != 0) {
-               ret = errno;
+               errno = -ret;
                if (errno == EFAULT) {
                        perror("Error in unreserving sub buffer\n");
                } else if (errno == EIO) {
@@ -415,7 +414,7 @@ int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream)
 
                ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len);
                if (ret != 0) {
-                       ret = errno;
+                       errno = -ret;
                        perror("kernctl_get_mmap_len");
                        goto error_close_fd;
                }