X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Findex%2Findex.c;h=54689677ee4a2f3dd3c56a6f06236115f659ead6;hp=89b4fd769eab98a49137fb08087388caec4469e4;hb=994ab360b3264e19fdf590178601fa1f9f6489d0;hpb=1c20f0e29cbf8627bfb1ff444572d52d6655c4e2

diff --git a/src/common/index/index.c b/src/common/index/index.c
index 89b4fd769..54689677e 100644
--- a/src/common/index/index.c
+++ b/src/common/index/index.c
@@ -19,6 +19,8 @@
 #define _GNU_SOURCE
 #include <assert.h>
 #include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
 
 #include <common/common.h>
 #include <common/defaults.h>
@@ -35,7 +37,8 @@ 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;
+	ssize_t size_ret;
+	struct ctf_packet_index_file_hdr hdr;
 	char fullpath[PATH_MAX];
 
 	ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR,
@@ -61,15 +64,15 @@ int index_create_file(char *path_name, char *stream_name, int uid, int gid,
 	}
 	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 = 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;
 	}
 
@@ -90,21 +93,93 @@ 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) {
+	ret = lttng_write(fd, index, len);
+	if (ret < len) {
 		PERROR("writing index file");
 	}
 
 	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;
+}