Merge tag 'perf-core-for-mingo-20160414' of git://git.kernel.org/pub/scm/linux/kernel...

[cascardo/linux.git] / tools / perf / util / data.c

diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index 1921942..be83516 100644 (file)
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -136,3 +136,44 @@ ssize_t perf_data_file__write(struct perf_data_file *file,
 {
        return writen(file->fd, buf, size);
 }
+
+int perf_data_file__switch(struct perf_data_file *file,
+                          const char *postfix,
+                          size_t pos, bool at_exit)
+{
+       char *new_filepath;
+       int ret;
+
+       if (check_pipe(file))
+               return -EINVAL;
+       if (perf_data_file__is_read(file))
+               return -EINVAL;
+
+       if (asprintf(&new_filepath, "%s.%s", file->path, postfix) < 0)
+               return -ENOMEM;
+
+       /*
+        * Only fire a warning, don't return error, continue fill
+        * original file.
+        */
+       if (rename(file->path, new_filepath))
+               pr_warning("Failed to rename %s to %s\n", file->path, new_filepath);
+
+       if (!at_exit) {
+               close(file->fd);
+               ret = perf_data_file__open(file);
+               if (ret < 0)
+                       goto out;
+
+               if (lseek(file->fd, pos, SEEK_SET) == (off_t)-1) {
+                       ret = -errno;
+                       pr_debug("Failed to lseek to %zu: %s",
+                                pos, strerror(errno));
+                       goto out;
+               }
+       }
+       ret = file->fd;
+out:
+       free(new_filepath);
+       return ret;
+}