-/*
- * Create the index file associated with a trace file.
- *
- * Return allocated struct lttng_index_file, NULL on error.
- */
-struct lttng_index_file *lttng_index_file_create(const char *path_name,
- char *stream_name, int uid, int gid,
- uint64_t size, uint64_t count, uint32_t major, uint32_t minor)
-{
- struct lttng_index_file *index_file;
- int ret, fd = -1;
- ssize_t size_ret;
- struct ctf_packet_index_file_hdr hdr;
- char fullpath[PATH_MAX];
- uint32_t element_len = ctf_packet_index_len(major, minor);
-
- index_file = zmalloc(sizeof(*index_file));
- if (!index_file) {
- PERROR("allocating lttng_index_file");
- goto error;
- }
-
- ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR,
- path_name);
- if (ret < 0) {
- PERROR("snprintf index path");
- goto error;
- }
-
- /* Create index directory if necessary. */
- ret = utils_mkdir(fullpath, S_IRWXU | S_IRWXG, uid, gid);
- if (ret < 0) {
- if (errno != EEXIST) {
- PERROR("Index trace directory creation error");
- goto error;
- }
- }
-
- /*
- * For tracefile rotation. We need to unlink the old
- * file if present to synchronize with the tail of the
- * live viewer which could be working on this same file.
- * By doing so, any reference to the old index file
- * stays valid even if we re-create a new file with the
- * same name afterwards.
- */
- ret = utils_unlink_stream_file(fullpath, stream_name, size, count, uid,
- gid, DEFAULT_INDEX_FILE_SUFFIX);
- if (ret < 0 && errno != ENOENT) {
- goto error;
- }
- ret = utils_create_stream_file(fullpath, stream_name, size, count, uid,
- gid, DEFAULT_INDEX_FILE_SUFFIX);
- if (ret < 0) {
- goto error;
- }
- fd = ret;
-
- ctf_packet_index_file_hdr_init(&hdr, major, minor);
- size_ret = lttng_write(fd, &hdr, sizeof(hdr));
- if (size_ret < sizeof(hdr)) {
- PERROR("write index header");
- goto error;
- }
- index_file->fd = fd;
- index_file->major = major;
- index_file->minor = minor;
- index_file->element_len = element_len;
- urcu_ref_init(&index_file->ref);
-
- return index_file;
-
-error:
- if (fd >= 0) {
- int close_ret;
-
- close_ret = close(fd);
- if (close_ret < 0) {
- PERROR("close index fd");
- }
- }
- free(index_file);
- return NULL;
-}