* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#define _GNU_SOURCE
+#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"
uint64_t size, uint64_t count)
{
int ret, fd = -1;
- struct lttng_packet_index_file_hdr hdr;
+ ssize_t size_ret;
+ struct ctf_packet_index_file_hdr hdr;
+ char fullpath[PATH_MAX];
- ret = utils_create_stream_file(path_name, stream_name, size, count, uid,
+ 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;
- memcpy(hdr.magic, INDEX_MAGIC, sizeof(hdr.magic));
- hdr.index_major = htobe32(INDEX_MAJOR);
- hdr.index_minor = htobe32(INDEX_MINOR);
+ hdr.magic = htobe32(CTF_INDEX_MAGIC);
+ hdr.index_major = htobe32(CTF_INDEX_MAJOR);
+ hdr.index_minor = htobe32(CTF_INDEX_MINOR);
+ hdr.packet_index_len = htobe32(sizeof(struct ctf_packet_index));
- do {
- ret = write(fd, &hdr, sizeof(hdr));
- } while (ret < 0 && errno == EINTR);
- if (ret < 0) {
+ size_ret = lttng_write(fd, &hdr, sizeof(hdr));
+ if (size_ret < sizeof(hdr)) {
PERROR("write index header");
+ ret = -1;
goto error;
}
/*
* Write index values to the given fd of size len.
*
- * Return 0 on success or else a negative value on error.
+ * Return "len" on success or else < len on error. errno contains error
+ * details.
*/
-int index_write(int fd, struct lttng_packet_index *index, size_t len)
+ssize_t index_write(int fd, struct ctf_packet_index *index, size_t len)
{
- int ret;
+ ssize_t ret;
- assert(fd >= 0);
assert(index);
- do {
- ret = write(fd, index, len);
- } while (ret < 0 && errno == EINTR);
- if (ret < 0) {
+ if (fd < 0) {
+ ret = -EINVAL;
+ goto error;
+ }
+
+ ret = lttng_write(fd, index, len);
+ if (ret < len) {
PERROR("writing index file");
}
+error:
+ return ret;
+}
+
+/*
+ * Open index file using a given path, channel name and tracefile count.
+ *
+ * Return read only FD on success or else a negative value.
+ */
+int index_open(const char *path_name, const char *channel_name,
+ uint64_t tracefile_count, uint64_t tracefile_count_current)
+{
+ int ret, read_fd;
+ ssize_t read_len;
+ char fullpath[PATH_MAX];
+ struct ctf_packet_index_file_hdr hdr;
+
+ assert(path_name);
+ assert(channel_name);
+
+ 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) {
+ if (errno == ENOENT) {
+ ret = -ENOENT;
+ } else {
+ 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;
+ }
+ if (be32toh(hdr.index_major) != CTF_INDEX_MAJOR ||
+ be32toh(hdr.index_minor) != CTF_INDEX_MINOR) {
+ ERR("Invalid header version");
+ goto error_close;
+ }
+
+ return read_fd;
+
+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);
+ }
+ }
+ ret = -1;
+
+error:
return ret;
}
projects / lttng-tools.git / blobdiff