[PATCH v3 03/10] tools lib api fs tracing_path: Add scandir alphasort

[Ian Rogers <irogers@google.com>]

tracing_events__opendir allows iteration over files in
<debugfs>/tracing/events but with an arbitrary sort order. Add a
scandir alternative where the results are alphabetically sorted.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/lib/api/fs/tracing_path.c | 16 ++++++++++++++++
 tools/lib/api/fs/tracing_path.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/tools/lib/api/fs/tracing_path.c b/tools/lib/api/fs/tracing_path.c
index 5afb11b30fca..b8e457c841ab 100644
--- a/tools/lib/api/fs/tracing_path.c
+++ b/tools/lib/api/fs/tracing_path.c
@@ -113,6 +113,22 @@ DIR *tracing_events__opendir(void)
 	return dir;
 }
 
+int tracing_events__scandir_alphasort(struct dirent ***namelist)
+{
+	char *path = get_tracing_file("events");
+	int ret;
+
+	if (!path) {
+		*namelist = NULL;
+		return 0;
+	}
+
+	ret = scandir(path, namelist, NULL, alphasort);
+	put_events_file(path);
+
+	return ret;
+}
+
 int tracing_path__strerror_open_tp(int err, char *buf, size_t size,
 				   const char *sys, const char *name)
 {
diff --git a/tools/lib/api/fs/tracing_path.h b/tools/lib/api/fs/tracing_path.h
index a19136b086dc..fc6347c11deb 100644
--- a/tools/lib/api/fs/tracing_path.h
+++ b/tools/lib/api/fs/tracing_path.h
@@ -6,6 +6,7 @@
 #include <dirent.h>
 
 DIR *tracing_events__opendir(void);
+int tracing_events__scandir_alphasort(struct dirent ***namelist);
 
 void tracing_path_set(const char *mountpoint);
 const char *tracing_path_mount(void);
-- 
2.38.1.431.g37b22c650d-goog