[PATCH 6/6] perf tools: Enhancement for perf list for unexpected input.

[Dongsheng Yang]

Example:
        # perf list test

        List of pre-defined events (to be used in -e):
        # echo $?
        0

Verification:
        # perf list test

        Error: No event for test.
        Usage:
                perf list [hw|sw|cache|tracepoint|pmu|event_glob]
        # echo $?
        255

Signed-off-by: Dongsheng Yang <yangds.f...@cn.fujitsu.com>
---
 tools/perf/builtin-list.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index 82d54b6..ba23f65 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -63,9 +63,11 @@ int cmd_list(int argc, const char **argv, const char *prefix 
__maybe_unused)
                else {
                        char *sep = strchr(argv[i], ':'), *s;
                        int sep_idx;
+                       unsigned int count;
 
                        if (sep == NULL) {
-                               print_events(argv[i], false);
+                               if(!(count = print_events(argv[i], false)))
+                                       goto err_out;
                                continue;
                        }
                        sep_idx = sep - argv[i];
@@ -74,9 +76,16 @@ int cmd_list(int argc, const char **argv, const char *prefix 
__maybe_unused)
                                return -1;
 
                        s[sep_idx] = '\0';
-                       print_tracepoint_events(s, s + sep_idx + 1, false);
+                       if (!(count = print_tracepoint_events(s, s + sep_idx + 
1, false)))
+                               goto err_out;
                        free(s);
                }
        }
+
        return 0;
+
+err_out:
+       printf("\nError: No event for %s.\n", argv[i]);
+       printf("Usage:\n\t%s\n", list_usage[0]);
+       return -1;
 }
-- 
1.8.2.1

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