+++ /dev/null
-/*
- * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
- * David Goulet <dgoulet@efficios.com>
- * 2016 - 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, 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., 51
- * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#define _LGPL_SOURCE
-#include <assert.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <fcntl.h>
-
-#include <lttng/constant.h>
-#include <common/common.h>
-#include <common/defaults.h>
-#include <common/compat/endian.h>
-#include <common/utils.h>
-
-#include "index.h"
-
-#define WRITE_FILE_FLAGS (O_WRONLY | O_CREAT | O_TRUNC)
-#define READ_ONLY_FILE_FLAGS O_RDONLY
-
-static struct lttng_index_file *_lttng_index_file_create_from_trace_chunk(
- struct lttng_trace_chunk *chunk,
- const char *channel_path, const char *stream_name,
- uint64_t stream_file_size, uint64_t stream_file_index,
- uint32_t index_major, uint32_t index_minor,
- bool unlink_existing_file,
- int flags)
-{
- 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 mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
- const bool acquired_reference = lttng_trace_chunk_get(chunk);
-
- assert(acquired_reference);
-
- index_file = zmalloc(sizeof(*index_file));
- if (!index_file) {
- PERROR("Failed to allocate lttng_index_file");
- goto error;
- }
-
- index_file->trace_chunk = chunk;
- 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_file_index,
- 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 &&
- !(chunk_status == LTTNG_TRACE_CHUNK_STATUS_ERROR &&
- errno == ENOENT)) {
- 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;
- }
-
- if (flags == WRITE_FILE_FLAGS) {
- 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->element_len = ctf_packet_index_len(index_major, index_minor);
- } else {
- uint32_t element_len;
-
- size_ret = lttng_read(fd, &hdr, sizeof(hdr));
- if (size_ret < 0) {
- PERROR("Failed to read index header");
- goto error;
- }
- if (be32toh(hdr.magic) != CTF_INDEX_MAGIC) {
- ERR("Invalid header magic");
- goto error;
- }
- if (index_major != be32toh(hdr.index_major)) {
- ERR("Index major number mismatch: %u, expect %u",
- be32toh(hdr.index_major), index_major);
- goto error;
- }
- if (index_minor != be32toh(hdr.index_minor)) {
- ERR("Index minor number mismatch: %u, expect %u",
- be32toh(hdr.index_minor), index_minor);
- goto error;
- }
- element_len = be32toh(hdr.packet_index_len);
- if (element_len > sizeof(struct ctf_packet_index)) {
- ERR("Index element length too long");
- goto error;
- }
- index_file->element_len = element_len;
- }
- index_file->fd = fd;
- index_file->major = index_major;
- index_file->minor = index_minor;
- 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;
-}
-
-struct lttng_index_file *lttng_index_file_create_from_trace_chunk(
- struct lttng_trace_chunk *chunk,
- const char *channel_path, const char *stream_name,
- uint64_t stream_file_size, uint64_t stream_file_index,
- uint32_t index_major, uint32_t index_minor,
- bool unlink_existing_file)
-{
- return _lttng_index_file_create_from_trace_chunk(chunk, channel_path,
- stream_name, stream_file_size, stream_file_index,
- index_major, index_minor, unlink_existing_file,
- WRITE_FILE_FLAGS);
-}
-
-struct lttng_index_file *lttng_index_file_create_from_trace_chunk_read_only(
- struct lttng_trace_chunk *chunk,
- const char *channel_path, const char *stream_name,
- uint64_t stream_file_size, uint64_t stream_file_index,
- uint32_t index_major, uint32_t index_minor)
-{
- return _lttng_index_file_create_from_trace_chunk(chunk, channel_path,
- stream_name, stream_file_size, stream_file_index,
- index_major, index_minor, false,
- READ_ONLY_FILE_FLAGS);
-}
-
-/*
- * Write index values to the given index file.
- *
- * Return 0 on success, -1 on error.
- */
-int lttng_index_file_write(const struct lttng_index_file *index_file,
- const struct ctf_packet_index *element)
-{
- int fd;
- size_t len;
- ssize_t ret;
-
- assert(index_file);
- assert(element);
-
- fd = index_file->fd;
- len = index_file->element_len;
-
- if (fd < 0) {
- goto error;
- }
-
- ret = lttng_write(fd, element, len);
- if (ret < len) {
- PERROR("writing index file");
- goto error;
- }
- return 0;
-
-error:
- return -1;
-}
-
-/*
- * Read index values from the given index file.
- *
- * Return 0 on success, -1 on error.
- */
-int lttng_index_file_read(const struct lttng_index_file *index_file,
- struct ctf_packet_index *element)
-{
- ssize_t ret;
- int fd = index_file->fd;
- size_t len = index_file->element_len;
-
- assert(element);
-
- if (fd < 0) {
- goto error;
- }
-
- ret = lttng_read(fd, element, len);
- if (ret < 0) {
- PERROR("read index file");
- goto error;
- }
- if (ret < len) {
- ERR("lttng_read expected %zu, returned %zd", len, ret);
- goto error;
- }
- return 0;
-
-error:
- return -1;
-}
-
-void lttng_index_file_get(struct lttng_index_file *index_file)
-{
- urcu_ref_get(&index_file->ref);
-}
-
-static void lttng_index_file_release(struct urcu_ref *ref)
-{
- struct lttng_index_file *index_file = caa_container_of(ref,
- struct lttng_index_file, ref);
-
- if (close(index_file->fd)) {
- PERROR("close index fd");
- }
- lttng_trace_chunk_put(index_file->trace_chunk);
- free(index_file);
-}
-
-void lttng_index_file_put(struct lttng_index_file *index_file)
-{
- urcu_ref_put(&index_file->ref, lttng_index_file_release);
-}
projects / lttng-tools.git / blobdiff