-/*
- * Create the stream file on disk.
- *
- * Return 0 on success or else a negative value.
- */
-LTTNG_HIDDEN
-int utils_create_stream_file(const char *path_name, char *file_name, uint64_t size,
- uint64_t count, int uid, int gid, char *suffix)
-{
- int ret, flags, mode;
- char path[LTTNG_PATH_MAX];
-
- ret = utils_stream_file_path(path_name, file_name,
- size, count, suffix, path, sizeof(path));
- if (ret < 0) {
- goto error;
- }
-
- /*
- * With the session rotation feature on the relay, we might need to seek
- * and truncate a tracefile, so we need read and write access.
- */
- flags = O_RDWR | O_CREAT | O_TRUNC;
- /* Open with 660 mode */
- mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
-
- if (uid < 0 || gid < 0) {
- ret = open(path, flags, mode);
- } else {
- ret = run_as_open(path, flags, mode, uid, gid);
- }
- if (ret < 0) {
- PERROR("open stream path %s", path);
- }
-error:
- return ret;
-}
-
-/*
- * Unlink the stream tracefile from disk.
- *
- * Return 0 on success or else a negative value.
- */
-LTTNG_HIDDEN
-int utils_unlink_stream_file(const char *path_name, char *file_name, uint64_t size,
- uint64_t count, int uid, int gid, char *suffix)
-{
- int ret;
- char path[LTTNG_PATH_MAX];
-
- ret = utils_stream_file_path(path_name, file_name, size, count, suffix,
- path, sizeof(path));
- if (ret < 0) {
- goto error;
- }
- if (uid < 0 || gid < 0) {
- ret = unlink(path);
- } else {
- ret = run_as_unlink(path, uid, gid);
- }
- if (ret < 0) {
- goto error;
- }
-error:
- DBG("utils_unlink_stream_file %s returns %d", path, ret);
- return ret;
-}
-
-/*
- * Change the output tracefile according to the given size and count The
- * new_count pointer is set during this operation.
- *
- * From the consumer, the stream lock MUST be held before calling this function
- * because we are modifying the stream status.
- *
- * Return 0 on success or else a negative value.
- */
-LTTNG_HIDDEN
-int utils_rotate_stream_file(char *path_name, char *file_name, uint64_t size,
- uint64_t count, int uid, int gid, int out_fd, uint64_t *new_count,
- int *stream_fd)
-{
- int ret;
-
- assert(stream_fd);
-
- ret = close(out_fd);
- if (ret < 0) {
- PERROR("Closing tracefile");
- goto error;
- }
- *stream_fd = -1;
-
- if (count > 0) {
- /*
- * In tracefile rotation, for the relay daemon we need
- * to unlink the old file if present, because it may
- * still be open in reading by the live thread, and we
- * need to ensure that we do not overwrite the content
- * between get_index and get_packet. Since we have no
- * way to verify integrity of the data content compared
- * to the associated index, we need to ensure the reader
- * has exclusive access to the file content, and that
- * the open of the data file is performed in get_index.
- * Unlinking the old file rather than overwriting it
- * achieves this.
- */
- if (new_count) {
- *new_count = (*new_count + 1) % count;
- }
- ret = utils_unlink_stream_file(path_name, file_name, size,
- new_count ? *new_count : 0, uid, gid, 0);
- if (ret < 0 && errno != ENOENT) {
- goto error;
- }
- } else {
- if (new_count) {
- (*new_count)++;
- }
- }
-
- ret = utils_create_stream_file(path_name, file_name, size,
- new_count ? *new_count : 0, uid, gid, 0);
- if (ret < 0) {
- goto error;
- }
- *stream_fd = ret;
-
- /* Success. */
- ret = 0;
-
-error:
- return ret;
-}
-
-