diff options
| author | Namhyung Kim <namhyung.kim@lge.com> | 2012-05-07 14:09:02 +0900 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-05-07 17:30:21 -0300 |
| commit | 16ad2ffb822cd28e2330284a60fdfec8bb90bbb0 (patch) | |
| tree | 4455824202a98540493d75dc5333f77cb42b59ba /tools/perf/util | |
| parent | dfe78adaaca90417ece98edbd3eb1c9661334406 (diff) | |
| download | linux-16ad2ffb822cd28e2330284a60fdfec8bb90bbb0.tar.bz2 | |
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/util')
| -rw-r--r-- | tools/perf/util/debug.c | 1 | ||||
| -rw-r--r-- | tools/perf/util/target.c | 51 | ||||
| -rw-r--r-- | tools/perf/util/target.h | 3 |
3 files changed, 55 insertions, 0 deletions
diff --git a/tools/perf/util/debug.c b/tools/perf/util/debug.c index 26817daa2961..efb1fce259a4 100644 --- a/tools/perf/util/debug.c +++ b/tools/perf/util/debug.c @@ -11,6 +11,7 @@ #include "event.h" #include "debug.h" #include "util.h" +#include "target.h" int verbose; bool dump_trace = false, quiet = false; diff --git a/tools/perf/util/target.c b/tools/perf/util/target.c index 02a6bedb69a3..1064d5b148ad 100644 --- a/tools/perf/util/target.c +++ b/tools/perf/util/target.c @@ -10,6 +10,7 @@ #include "debug.h" #include <pwd.h> +#include <string.h> enum perf_target_errno perf_target__validate(struct perf_target *target) @@ -89,3 +90,53 @@ enum perf_target_errno perf_target__parse_uid(struct perf_target *target) target->uid = result->pw_uid; return PERF_ERRNO_TARGET__SUCCESS; } + +/* + * This must have a same ordering as the enum perf_target_errno. + */ +static const char *perf_target__error_str[] = { + "PID/TID switch overriding CPU", + "PID/TID switch overriding UID", + "UID switch overriding CPU", + "PID/TID switch overriding SYSTEM", + "UID switch overriding SYSTEM", + "Invalid User: %s", + "Problems obtaining information for user %s", +}; + +int perf_target__strerror(struct perf_target *target, int errnum, + char *buf, size_t buflen) +{ + int idx; + const char *msg; + + if (errnum >= 0) { + strerror_r(errnum, buf, buflen); + return 0; + } + + if (errnum < __PERF_ERRNO_TARGET__START || + errnum >= __PERF_ERRNO_TARGET__END) + return -1; + + idx = errnum - __PERF_ERRNO_TARGET__START; + msg = perf_target__error_str[idx]; + + switch (errnum) { + case PERF_ERRNO_TARGET__PID_OVERRIDE_CPU + ... PERF_ERRNO_TARGET__UID_OVERRIDE_SYSTEM: + snprintf(buf, buflen, "%s", msg); + break; + + case PERF_ERRNO_TARGET__INVALID_UID: + case PERF_ERRNO_TARGET__USER_NOT_FOUND: + snprintf(buf, buflen, msg, target->uid_str); + break; + + default: + /* cannot reach here */ + break; + } + + return 0; +} diff --git a/tools/perf/util/target.h b/tools/perf/util/target.h index d4aabdaba42a..6fcd01c440a9 100644 --- a/tools/perf/util/target.h +++ b/tools/perf/util/target.h @@ -43,4 +43,7 @@ enum perf_target_errno { enum perf_target_errno perf_target__validate(struct perf_target *target); enum perf_target_errno perf_target__parse_uid(struct perf_target *target); +int perf_target__strerror(struct perf_target *target, int errnum, char *buf, + size_t buflen); + #endif /* _PERF_TARGET_H */ |