perf util: Move debugfs/tracing helper functions to util.c

Since they're generic helpers move them to util.c so that they can be
used by others.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1372230862-15861-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 59d868add275..9a0658405760 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -269,3 +269,62 @@ void perf_debugfs_set_path(const char *mntpt)
         snprintf(debugfs_mountpoint, strlen(debugfs_mountpoint), "%s", mntpt);
         set_tracing_events_path(mntpt);
 }
+
+static const char *find_debugfs(void)
+{
+        const char *path = perf_debugfs_mount(NULL);
+
+        if (!path)
+                fprintf(stderr, "Your kernel does not support the debugfs filesystem");
+
+        return path;
+}
+
+/*
+ * Finds the path to the debugfs/tracing
+ * Allocates the string and stores it.
+ */
+const char *find_tracing_dir(void)
+{
+        static char *tracing;
+        static int tracing_found;
+        const char *debugfs;
+
+        if (tracing_found)
+                return tracing;
+
+        debugfs = find_debugfs();
+        if (!debugfs)
+                return NULL;
+
+        tracing = malloc(strlen(debugfs) + 9);
+        if (!tracing)
+                return NULL;
+
+        sprintf(tracing, "%s/tracing", debugfs);
+
+        tracing_found = 1;
+        return tracing;
+}
+
+char *get_tracing_file(const char *name)
+{
+        const char *tracing;
+        char *file;
+
+        tracing = find_tracing_dir();
+        if (!tracing)
+                return NULL;
+
+        file = malloc(strlen(tracing) + strlen(name) + 2);
+        if (!file)
+                return NULL;
+
+        sprintf(file, "%s/%s", tracing, name);
+        return file;
+}
+
+void put_tracing_file(char *file)
+{
+        free(file);
+}