The new API associates an output file handler with a custom kernel symbols
file. It is used when creating the trace file instead of the system default
kernel symbols file.
tracecmd_output_set_kallsyms()
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx>
---
.../include/private/trace-cmd-private.h | 1 +
lib/trace-cmd/trace-output.c | 32 +++++++++++++++++--
2 files changed, 31 insertions(+), 2 deletions(-)
diff --git a/lib/trace-cmd/include/private/trace-cmd-private.h b/lib/trace-cmd/include/private/trace-cmd-private.h
index ad9d5265..8ef448eb 100644
--- a/lib/trace-cmd/include/private/trace-cmd-private.h
+++ b/lib/trace-cmd/include/private/trace-cmd-private.h
@@ -273,6 +273,7 @@ struct tracecmd_output *tracecmd_output_allocate(int fd);
int tracecmd_output_set_msg(struct tracecmd_output *handler,
struct tracecmd_msg_handle *msg_handle);
int tracecmd_output_set_trace_dir(struct tracecmd_output *handler, const char *tracing_dir);
+int tracecmd_output_set_kallsyms(struct tracecmd_output *handler, const char *kallsyms);
struct tracecmd_output *tracecmd_create_file_latency(const char *output_file, int cpus);
struct tracecmd_output *
tracecmd_create_init_file_glob(const char *output_file,
diff --git a/lib/trace-cmd/trace-output.c b/lib/trace-cmd/trace-output.c
index a5d7ed5f..c654561a 100644
--- a/lib/trace-cmd/trace-output.c
+++ b/lib/trace-cmd/trace-output.c
@@ -54,6 +54,7 @@ struct tracecmd_output {
int cpus;
struct tep_handle *pevent;
char *tracing_dir;
+ char *kallsyms;
int nr_options;
bool quiet;
unsigned long file_state;
@@ -767,8 +768,8 @@ static int read_proc_kallsyms(struct tracecmd_output *handle,
return -1;
}
- if (kallsyms)
- path = kallsyms;
+ if (handle->kallsyms)
+ path = handle->kallsyms;
ret = stat(path, &st);
if (ret < 0) {
@@ -968,6 +969,33 @@ int tracecmd_output_set_trace_dir(struct tracecmd_output *handler, const char *t
return 0;
}
+/**
+ * tracecmd_output_set_kallsyms - Set a custom kernel symbols file, instead of system default
+ * @handle: output handler to a trace file.
+ * @tracing_dir: full path to a file with kernel symbols
+ *
+ * This API associates an output file handler with a custom kernel symbols file, to be used when
+ * creating the trace file instead of the system default kernel symbols file.
+ * This API must be called before tracecmd_output_write_init().
+ *
+ * Returns 0 on success, or -1 if the output file handler is not allocated or not in expected state.
+ */
+int tracecmd_output_set_kallsyms(struct tracecmd_output *handler, const char *kallsyms)
+{
+ if (!handler || handler->file_state != TRACECMD_FILE_ALLOCATED)
+ return -1;
+
+ free(handler->kallsyms);
+ if (kallsyms) {
+ handler->kallsyms = strdup(kallsyms);
+ if (!handler->kallsyms)
+ return -1;
+ } else
+ handler->kallsyms = NULL;
+
+ return 0;
+}
+
static int select_file_version(struct tracecmd_output *handle,
struct tracecmd_input *ihandle)
{
--
2.31.1
|