tools lib api fs tracing_path: Introduce get/put_events_file() helpers

To make reading events files a tad more compact than with
get_tracing_files("events/foo").

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-do6xgtwpmfl8zjs1euxsd2du@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/lib/api/fs/tracing_path.c b/tools/lib/api/fs/tracing_path.c
index 6f5fe94..9cd2824 100644 (file)
--- a/tools/lib/api/fs/tracing_path.c
+++ b/tools/lib/api/fs/tracing_path.c
@@ -86,6 +86,21 @@ void put_tracing_file(char *file)
        free(file);
 }
 
+char *get_events_file(const char *name)
+{
+       char *file;
+
+       if (asprintf(&file, "%s/events/%s", tracing_path_mount(), name) < 0)
+               return NULL;
+
+       return file;
+}
+
+void put_events_file(char *file)
+{
+       free(file);
+}
+
 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 1b65dec..3b32fb4 100644 (file)
--- a/tools/lib/api/fs/tracing_path.h
+++ b/tools/lib/api/fs/tracing_path.h
@@ -12,5 +12,10 @@ const char *tracing_path_mount(void);
 char *get_tracing_file(const char *name);
 void put_tracing_file(char *file);
 
+char *get_events_file(const char *name);
+void put_events_file(char *file);
+
+#define zput_events_file(ptr) ({ free(*ptr); *ptr = NULL; })
+
 int tracing_path__strerror_open_tp(int err, char *buf, size_t size, const char *sys, const char *name);
 #endif /* __API_FS_TRACING_PATH_H */

diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
index d7f2113..c85d0d1 100644 (file)
--- a/tools/perf/util/trace-event-info.c
+++ b/tools/perf/util/trace-event-info.c
@@ -103,11 +103,10 @@ out:
 
 static int record_header_files(void)
 {
-       char *path;
+       char *path = get_events_file("header_page");
        struct stat st;
        int err = -EIO;
 
-       path = get_tracing_file("events/header_page");
        if (!path) {
                pr_debug("can't get tracing/events/header_page");
                return -ENOMEM;
@@ -128,9 +127,9 @@ static int record_header_files(void)
                goto out;
        }
 
-       put_tracing_file(path);
+       put_events_file(path);
 
-       path = get_tracing_file("events/header_event");
+       path = get_events_file("header_event");
        if (!path) {
                pr_debug("can't get tracing/events/header_event");
                err = -ENOMEM;
@@ -154,7 +153,7 @@ static int record_header_files(void)
 
        err = 0;
 out:
-       put_tracing_file(path);
+       put_events_file(path);
        return err;
 }
 
@@ -243,7 +242,7 @@ static int record_ftrace_files(struct tracepoint_path *tps)
        char *path;
        int ret;
 
-       path = get_tracing_file("events/ftrace");
+       path = get_events_file("ftrace");
        if (!path) {
                pr_debug("can't get tracing/events/ftrace");
                return -ENOMEM;