[v2] trace-cmd library: Add API to get information from trace file

Commit Message

Michael Sartain Dec. 3, 2021, 11:30 p.m. UTC

New APIs added to get trace cpustats, uname, version strings, and
cpu file sizes.

  const char *tracecmd_get_cpustats(struct tracecmd_input *handle);
  const char *tracecmd_get_uname(struct tracecmd_input *handle);
  const char *tracecmd_get_version(struct tracecmd_input *handle);
  unsigned long long tracecmd_get_cpu_file_size(struct tracecmd_input *handle, int cpu);

Signed-off-by: Michael Sartain <[e-mail]>
---
 .../include/private/trace-cmd-private.h       |  5 ++
 lib/trace-cmd/trace-input.c                   | 63 +++++++++++++++++++
 2 files changed, 68 insertions(+)

Patch

diff --git a/lib/trace-cmd/include/private/trace-cmd-private.h b/lib/trace-cmd/include/private/trace-cmd-private.h
index c58b09e..6e2af31 100644
--- a/lib/trace-cmd/include/private/trace-cmd-private.h
+++ b/lib/trace-cmd/include/private/trace-cmd-private.h
@@ -90,6 +90,11 @@  bool tracecmd_get_quiet(struct tracecmd_output *handle);
 void tracecmd_set_out_clock(struct tracecmd_output *handle, const char *clock);
 const char *tracecmd_get_trace_clock(struct tracecmd_input *handle);
 
+const char *tracecmd_get_cpustats(struct tracecmd_input *handle);
+const char *tracecmd_get_uname(struct tracecmd_input *handle);
+const char *tracecmd_get_version(struct tracecmd_input *handle);
+off64_t tracecmd_get_cpu_file_size(struct tracecmd_input *handle, int cpu);
+
 static inline int tracecmd_host_bigendian(void)
 {
 	unsigned char str[] = { 0x1, 0x2, 0x3, 0x4 };
diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c
index ac57bc4..c55adcd 100644
--- a/lib/trace-cmd/trace-input.c
+++ b/lib/trace-cmd/trace-input.c
@@ -4088,6 +4088,69 @@  const char *tracecmd_get_trace_clock(struct tracecmd_input *handle)
 	return handle->trace_clock;
 }
 
+/**
+ * tracecmd_get_cpustats - return the saved cpu stats
+ * @handle: input handle for the trace.dat file
+ *
+ * Provides a method to extract the cpu stats saved in @handle.
+ *
+ * Returns a string of the cpu stats that was saved in the trace.dat file.
+ * The string should not be freed, as it points to the internal
+ * structure data.
+ */
+const char *tracecmd_get_cpustats(struct tracecmd_input *handle)
+{
+	return handle->cpustats;
+}
+
+/**
+ * tracecmd_get_uname - return the saved name and kernel information
+ * @handle: input handle for the trace.dat file
+ *
+ * Provides a method to extract the system information saved in @handle.
+ *
+ * Returns a string of the system information that was saved in the
+ * trace.dat file.
+ * The string should not be freed, as it points to the internal
+ * structure data.
+ */
+const char *tracecmd_get_uname(struct tracecmd_input *handle)
+{
+	return handle->uname;
+}
+
+/**
+ * tracecmd_get_version - return the saved version information
+ * @handle: input handle for the trace.dat file
+ *
+ * Provides a method to extract the version string saved in @handle.
+ *
+ * Returns a string of the version that was saved in the trace.dat file.
+ * The string should not be freed, as it points to the internal
+ * structure data.
+ */
+const char *tracecmd_get_version(struct tracecmd_input *handle)
+{
+	return handle->version;
+}
+
+/**
+ * tracecmd_get_cpu_file_size - return the saved cpu file size
+ * @handle: input handle for the trace.dat file
+ * @cpu: cpu index
+ *
+ * Provides a method to extract the cpu file size saved in @handle.
+ *
+ * Returns the cpu file size saved in trace.dat file or (off64_t)-1 for
+ * invalid cpu index.
+ */
+off64_t tracecmd_get_cpu_file_size(struct tracecmd_input *handle, int cpu)
+{
+	if (cpu < 0 || cpu >= handle->cpus)
+		return (off64_t)-1;
+	return handle->cpu_data[cpu].file_size;
+}
+
 /**
  * tracecmd_get_show_data_func - return the show data func
  * @handle: input handle for the trace.dat file