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authorNamhyung Kim <namhyung.kim@lge.com>2012-05-07 14:09:02 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2012-05-07 17:30:21 -0300
commit16ad2ffb822cd28e2330284a60fdfec8bb90bbb0 (patch)
tree4455824202a98540493d75dc5333f77cb42b59ba /tools/perf/builtin-top.c
parentdfe78adaaca90417ece98edbd3eb1c9661334406 (diff)
perf tools: Introduce perf_target__strerror()
The perf_target__strerror() sets @buf to a string that describes the (perf_target-specific) error condition that is passed via @errnum. This is similar to strerror_r() and does same thing if @errnum has a standard errno value. Signed-off-by: Namhyung Kim <namhyung.kim@lge.com> Suggested-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Reviewed-by: David Ahern <dsahern@gmail.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1336367344-28071-6-git-send-email-namhyung.kim@lge.com [ committer note: No need to use PERF_ERRNO_TARGET__SUCCESS, use shorter idiom ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-top.c')
-rw-r--r--tools/perf/builtin-top.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index c9137ba580d..7ba0f03c013 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1150,7 +1150,8 @@ static const char * const top_usage[] = {
int cmd_top(int argc, const char **argv, const char *prefix __used)
{
struct perf_evsel *pos;
- int status = -ENOMEM;
+ int status;
+ char errbuf[BUFSIZ];
struct perf_top top = {
.count_filter = 5,
.delay_secs = 2,
@@ -1252,10 +1253,22 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
setup_browser(false);
- perf_target__validate(&top.target);
+ status = perf_target__validate(&top.target);
+ if (status) {
+ perf_target__strerror(&top.target, status, errbuf, BUFSIZ);
+ ui__warning("%s", errbuf);
+ }
+
+ status = perf_target__parse_uid(&top.target);
+ if (status) {
+ int saved_errno = errno;
- if (perf_target__parse_uid(&top.target) < 0)
+ perf_target__strerror(&top.target, status, errbuf, BUFSIZ);
+ ui__warning("%s", errbuf);
+
+ status = -saved_errno;
goto out_delete_evlist;
+ }
if (top.target.tid == 0 && top.target.pid == 0 &&
top.target.uid_str == NULL)