Merge branch 'master' into memleak-finder

[lttng-tools.git] / src / common / index / index.c

diff --git a/src/common/index/index.c b/src/common/index/index.c
new file mode 100644 (file)
index 0000000..89b4fd7
--- /dev/null
+++ b/src/common/index/index.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
+ *                      David Goulet <dgoulet@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 _GNU_SOURCE
+#include <assert.h>
+#include <sys/stat.h>
+
+#include <common/common.h>
+#include <common/defaults.h>
+#include <common/utils.h>
+
+#include "index.h"
+
+/*
+ * Create the index file associated with a trace file.
+ *
+ * Return fd on success, a negative value on error.
+ */
+int index_create_file(char *path_name, char *stream_name, int uid, int gid,
+               uint64_t size, uint64_t count)
+{
+       int ret, fd = -1;
+       struct lttng_packet_index_file_hdr hdr;
+       char fullpath[PATH_MAX];
+
+       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 = run_as_mkdir(fullpath, S_IRWXU | S_IRWXG, uid, gid);
+       if (ret < 0) {
+               if (ret != -EEXIST) {
+                       ERR("Index trace directory creation error");
+                       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);
+
+       do {
+               ret = write(fd, &hdr, sizeof(hdr));
+       } while (ret < 0 && errno == EINTR);
+       if (ret < 0) {
+               PERROR("write index header");
+               goto error;
+       }
+
+       return fd;
+
+error:
+       if (fd >= 0) {
+               int close_ret;
+
+               close_ret = close(fd);
+               if (close_ret < 0) {
+                       PERROR("close index fd");
+               }
+       }
+       return ret;
+}
+
+/*
+ * Write index values to the given fd of size len.
+ *
+ * Return 0 on success or else a negative value on error.
+ */
+int index_write(int fd, struct lttng_packet_index *index, size_t len)
+{
+       int ret;
+
+       assert(fd >= 0);
+       assert(index);
+
+       do {
+               ret = write(fd, index, len);
+       } while (ret < 0 && errno == EINTR);
+       if (ret < 0) {
+               PERROR("writing index file");
+       }
+
+       return ret;
+}