+++ /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 <common/common.h>
-#include <common/defaults.h>
-#include <common/compat/endian.h>
-#include <common/utils.h>
-
-#include "index.h"
-
-/*
- * 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;
-}
-
-/*
- * 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;
-}
-
-/*
- * Open index file using a given path, channel name and tracefile count.
- *
- * Return allocated struct lttng_index_file, NULL on error.
- */
-struct lttng_index_file *lttng_index_file_open(const char *path_name,
- const char *channel_name, uint64_t tracefile_count,
- uint64_t tracefile_count_current)
-{
- struct lttng_index_file *index_file;
- int ret, read_fd;
- ssize_t read_len;
- char fullpath[PATH_MAX];
- struct ctf_packet_index_file_hdr hdr;
- uint32_t major, minor, element_len;
-
- assert(path_name);
- assert(channel_name);
-
- index_file = zmalloc(sizeof(*index_file));
- if (!index_file) {
- PERROR("allocating lttng_index_file");
- goto error;
- }
-
- if (tracefile_count > 0) {
- ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR "/%s_%"
- PRIu64 DEFAULT_INDEX_FILE_SUFFIX, path_name,
- channel_name, tracefile_count_current);
- } else {
- ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR "/%s"
- DEFAULT_INDEX_FILE_SUFFIX, path_name, channel_name);
- }
- if (ret < 0) {
- PERROR("snprintf index path");
- goto error;
- }
-
- DBG("Index opening file %s in read only", fullpath);
- read_fd = open(fullpath, O_RDONLY);
- if (read_fd < 0) {
- PERROR("opening index in read-only");
- goto error;
- }
-
- read_len = lttng_read(read_fd, &hdr, sizeof(hdr));
- if (read_len < 0) {
- PERROR("Reading index header");
- goto error_close;
- }
-
- if (be32toh(hdr.magic) != CTF_INDEX_MAGIC) {
- ERR("Invalid header magic");
- goto error_close;
- }
- major = be32toh(hdr.index_major);
- minor = be32toh(hdr.index_minor);
- element_len = be32toh(hdr.packet_index_len);
-
- if (major != CTF_INDEX_MAJOR) {
- ERR("Invalid header version");
- goto error_close;
- }
- if (element_len > sizeof(struct ctf_packet_index)) {
- ERR("Index element length too long");
- goto error_close;
- }
-
- index_file->fd = read_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_close:
- if (read_fd >= 0) {
- int close_ret;
-
- close_ret = close(read_fd);
- if (close_ret < 0) {
- PERROR("close read fd %d", read_fd);
- }
- }
-
-error:
- free(index_file);
- return NULL;
-}
-
-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");
- }
- 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