#include <sys/types.h>
#include <fcntl.h>
+#include <lttng/constant.h>
#include <common/common.h>
#include <common/defaults.h>
#include <common/compat/endian.h>
return NULL;
}
+struct lttng_index_file *lttng_index_file_create_from_trace_chunk(
+ struct lttng_trace_chunk *chunk,
+ const char *channel_path, char *stream_name,
+ uint64_t stream_file_size, uint64_t stream_count,
+ uint32_t index_major, uint32_t index_minor,
+ bool unlink_existing_file)
+{
+ struct lttng_index_file *index_file;
+ enum lttng_trace_chunk_status chunk_status;
+ int ret, fd = -1;
+ ssize_t size_ret;
+ struct ctf_packet_index_file_hdr hdr;
+ char index_directory_path[LTTNG_PATH_MAX];
+ char index_file_path[LTTNG_PATH_MAX];
+ const uint32_t element_len = ctf_packet_index_len(index_major,
+ index_minor);
+ const int flags = O_WRONLY | O_CREAT | O_TRUNC;
+ const mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
+
+ index_file = zmalloc(sizeof(*index_file));
+ if (!index_file) {
+ PERROR("Failed to allocate lttng_index_file");
+ goto error;
+ }
+
+ ret = snprintf(index_directory_path, sizeof(index_directory_path),
+ "%s/" DEFAULT_INDEX_DIR, channel_path);
+ if (ret < 0 || ret >= sizeof(index_directory_path)) {
+ ERR("Failed to format index directory path");
+ goto error;
+ }
+
+ ret = utils_stream_file_path(index_directory_path, stream_name,
+ stream_file_size, stream_count,
+ DEFAULT_INDEX_FILE_SUFFIX,
+ index_file_path, sizeof(index_file_path));
+ if (ret) {
+ goto error;
+ }
+
+ if (unlink_existing_file) {
+ /*
+ * 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.
+ */
+ chunk_status = lttng_trace_chunk_unlink_file(chunk,
+ index_file_path);
+ if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
+ goto error;
+ }
+ }
+
+ chunk_status = lttng_trace_chunk_open_file(chunk, index_file_path,
+ flags, mode, &fd);
+ if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
+ goto error;
+ }
+
+ ctf_packet_index_file_hdr_init(&hdr, index_major, index_minor);
+ size_ret = lttng_write(fd, &hdr, sizeof(hdr));
+ if (size_ret < sizeof(hdr)) {
+ PERROR("Failed to write index header");
+ goto error;
+ }
+ index_file->fd = fd;
+ index_file->major = index_major;
+ index_file->minor = index_minor;
+ index_file->element_len = element_len;
+ urcu_ref_init(&index_file->ref);
+
+ return index_file;
+
+error:
+ if (fd >= 0) {
+ ret = close(fd);
+ if (ret < 0) {
+ PERROR("Failed to close file descriptor of index file");
+ }
+ }
+ free(index_file);
+ return NULL;
+}
+
/*
* Write index values to the given index file.
*