The new helper functions can be used the update the trace buffer
metadata with the real offset within the trace file, where the buffer
data are stored.
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx>
---
lib/trace-cmd/trace-output.c | 49 ++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/lib/trace-cmd/trace-output.c b/lib/trace-cmd/trace-output.c
index 1f144d28..17607b93 100644
--- a/lib/trace-cmd/trace-output.c
+++ b/lib/trace-cmd/trace-output.c
@@ -1395,6 +1395,20 @@ int tracecmd_write_buffer_info(struct tracecmd_output *handle)
return 0;
}
+static tsize_t get_buffer_file_offset(struct tracecmd_output *handle, const char *name)
+{
+ struct tracecmd_buffer *buf;
+
+ list_for_each_entry(buf, &handle->buffers, list) {
+ if (!strcmp(name, buf->name)) {
+ if (!buf->option)
+ break;
+ return buf->option->offset;
+ }
+ }
+ return 0;
+}
+
int tracecmd_write_cmdlines(struct tracecmd_output *handle)
{
int ret;
@@ -1487,6 +1501,41 @@ out:
return ret;
}
+static int update_buffer_cpu_offset(struct tracecmd_output *handle,
+ const char *name, tsize_t offset)
+{
+ tsize_t b_offset;
+ tsize_t current;
+
+ if (!name)
+ name = "";
+
+ b_offset = get_buffer_file_offset(handle, name);
+ if (!b_offset) {
+ tracecmd_warning("Cannot find description for buffer %s\n", name);
+ return -1;
+ }
+
+ current = lseek64(handle->fd, 0, SEEK_CUR);
+
+ /* Go to the option data, where will write the offest */
+ if (lseek64(handle->fd, b_offset, SEEK_SET) == (off64_t)-1) {
+ tracecmd_warning("could not seek to %lld\n", b_offset);
+ return -1;
+ }
+
+ if (do_write_check(handle, &offset, 8))
+ return -1;
+
+ /* Go back to end of file */
+ if (lseek64(handle->fd, current, SEEK_SET) == (off64_t)-1) {
+ tracecmd_warning("could not seek to %lld\n", offset);
+ return -1;
+ }
+ return 0;
+}
+
+
static char *get_clock(struct tracecmd_output *handle)
{
struct tracefs_instance *inst;
--
2.31.1
|