tools lib traceevent: Get rid of malloc_or_die() in find_event()

Make it return pevent_errno to distinguish malloc allocation failure.
Since it'll be returned to user later, add more error code.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1386833777-3790-6-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 22 insertions, 9 deletions

diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h
index 6e23f197175f..abdfd3c606ed 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -356,7 +356,9 @@ enum pevent_flag {
         _PE(READ_FORMAT_FAILED, "failed to read event format"),               \
         _PE(READ_PRINT_FAILED,  "failed to read event print fmt"),            \
         _PE(OLD_FTRACE_ARG_FAILED,"failed to allocate field name for ftrace"),\
-        _PE(INVALID_ARG_TYPE,   "invalid argument type")
+        _PE(INVALID_ARG_TYPE,   "invalid argument type"),                     \
+        _PE(INVALID_EVENT_NAME, "invalid event name"),                        \
+        _PE(EVENT_NOT_FOUND,    "No event found")
 
 #undef _PE
 #define _PE(__code, __str) PEVENT_ERRNO__ ## __code
diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c
index 246ee81e1f93..a0ab040e8f71 100644
--- a/tools/lib/traceevent/parse-filter.c
+++ b/tools/lib/traceevent/parse-filter.c
@@ -287,7 +287,7 @@ static int event_match(struct event_format *event,
                 !regexec(ereg, event->name, 0, NULL, 0);
 }
 
-static int
+static enum pevent_errno
 find_event(struct pevent *pevent, struct event_list **events,
            char *sys_name, char *event_name)
 {
@@ -306,23 +306,31 @@ find_event(struct pevent *pevent, struct event_list **events,
                 sys_name = NULL;
         }
 
-        reg = malloc_or_die(strlen(event_name) + 3);
+        reg = malloc(strlen(event_name) + 3);
+        if (reg == NULL)
+                return PEVENT_ERRNO__MEM_ALLOC_FAILED;
+
         sprintf(reg, "^%s$", event_name);
 
         ret = regcomp(&ereg, reg, REG_ICASE|REG_NOSUB);
         free(reg);
 
         if (ret)
-                return -1;
+                return PEVENT_ERRNO__INVALID_EVENT_NAME;
 
         if (sys_name) {
-                reg = malloc_or_die(strlen(sys_name) + 3);
+                reg = malloc(strlen(sys_name) + 3);
+                if (reg == NULL) {
+                        regfree(&ereg);
+                        return PEVENT_ERRNO__MEM_ALLOC_FAILED;
+                }
+
                 sprintf(reg, "^%s$", sys_name);
                 ret = regcomp(&sreg, reg, REG_ICASE|REG_NOSUB);
                 free(reg);
                 if (ret) {
                         regfree(&ereg);
-                        return -1;
+                        return PEVENT_ERRNO__INVALID_EVENT_NAME;
                 }
         }
 
@@ -342,9 +350,9 @@ find_event(struct pevent *pevent, struct event_list **events,
                 regfree(&sreg);
 
         if (!match)
-                return -1;
+                return PEVENT_ERRNO__EVENT_NOT_FOUND;
         if (fail)
-                return -2;
+                return PEVENT_ERRNO__MEM_ALLOC_FAILED;
 
         return 0;
 }
@@ -1312,7 +1320,10 @@ int pevent_filter_add_filter_str(struct event_filter *filter,
                 /* Find this event */
                 ret = find_event(pevent, &events, strim(sys_name), strim(event_name));
                 if (ret < 0) {
-                        if (event_name)
+                        if (ret == PEVENT_ERRNO__MEM_ALLOC_FAILED)
+                                show_error(error_str,
+                                           "Memory allocation failure");
+                        else if (event_name)
                                 show_error(error_str,
                                            "No event found under '%s.%s'",
                                            sys_name, event_name);