perf trace/scripting: Add support for script args

One oversight of the original scripting_ops patch was a lack of
support for passing args to handler scripts.  This adds
argc/argv to the start_script() scripting_op, and changes the
rw-by-file script to take 'comm' arg rather than the 'perf'
value currently hard-coded.  It also takes the opportunity to do
some related minor cleanup.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
LKML-Reference: <1260867220-15699-2-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 27 insertions, 11 deletions

diff --git a/tools/perf/util/trace-event-perl.c b/tools/perf/util/trace-event-perl.c
index a5ffe60db5d..6f10e760245 100644
--- a/tools/perf/util/trace-event-perl.c
+++ b/tools/perf/util/trace-event-perl.c
@@ -267,7 +267,7 @@ int common_lock_depth(struct scripting_context *context)
 }
 
 static void perl_process_event(int cpu, void *data,
-                               int size __attribute((unused)),
+                               int size __unused,
                                unsigned long long nsecs, char *comm)
 {
         struct format_field *field;
@@ -359,28 +359,42 @@ static void run_start_sub(void)
 /*
  * Start trace script
  */
-static int perl_start_script(const char *script)
+static int perl_start_script(const char *script, int argc, const char **argv)
 {
-        const char *command_line[2] = { "", NULL };
+        const char **command_line;
+        int i, err = 0;
 
+        command_line = malloc((argc + 2) * sizeof(const char *));
+        command_line[0] = "";
         command_line[1] = script;
+        for (i = 2; i < argc + 2; i++)
+                command_line[i] = argv[i - 2];
 
         my_perl = perl_alloc();
         perl_construct(my_perl);
 
-        if (perl_parse(my_perl, xs_init, 2, (char **)command_line,
-                       (char **)NULL))
-                return -1;
+        if (perl_parse(my_perl, xs_init, argc + 2, (char **)command_line,
+                       (char **)NULL)) {
+                err = -1;
+                goto error;
+        }
 
         perl_run(my_perl);
-        if (SvTRUE(ERRSV))
-                return -1;
+        if (SvTRUE(ERRSV)) {
+                err = -1;
+                goto error;
+        }
 
         run_start_sub();
 
+        free(command_line);
         fprintf(stderr, "perf trace started with Perl script %s\n\n", script);
-
         return 0;
+error:
+        perl_free(my_perl);
+        free(command_line);
+
+        return err;
 }
 
 /*
@@ -579,7 +593,9 @@ static void print_unsupported_msg(void)
                 "\n  etc.\n");
 }
 
-static int perl_start_script_unsupported(const char *script __unused)
+static int perl_start_script_unsupported(const char *script __unused,
+                                         int argc __unused,
+                                         const char **argv __unused)
 {
         print_unsupported_msg();
 
diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index 81698d5e650..6ad405620c9 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -270,7 +270,7 @@ enum trace_flag_type {
 
 struct scripting_ops {
         const char *name;
-        int (*start_script) (const char *);
+        int (*start_script) (const char *script, int argc, const char **argv);
         int (*stop_script) (void);
         void (*process_event) (int cpu, void *data, int size,
                                unsigned long long nsecs, char *comm);