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author | Namhyung Kim <namhyung.kim@lge.com> | 2012-08-22 16:00:30 +0900 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-08-22 16:03:39 -0300 |
commit | 2f197b9d7eeaa723a80243610956fe4a17e7b5a4 (patch) | |
tree | b5f8181066874ece8cff95a5a0e8b18857cb5de7 /tools/lib/traceevent | |
parent | bffddffde7f9bd093909235a25dbb806fe639dde (diff) | |
download | op-kernel-dev-2f197b9d7eeaa723a80243610956fe4a17e7b5a4.zip op-kernel-dev-2f197b9d7eeaa723a80243610956fe4a17e7b5a4.tar.gz |
tools lib traceevent: Introduce pevent_strerror
The pevent_strerror() sets @buf to a string that describes the
(libtraceevent-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.
To sync error string with its code, define PEVENT_ERRORS with _PE()
macro and use it as suggested by Steven.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1345618831-9148-4-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/lib/traceevent')
-rw-r--r-- | tools/lib/traceevent/event-parse.c | 43 | ||||
-rw-r--r-- | tools/lib/traceevent/event-parse.h | 20 |
2 files changed, 57 insertions, 6 deletions
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c index a46cae7..1373e4c 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -4795,6 +4795,49 @@ enum pevent_errno pevent_parse_event(struct pevent *pevent, const char *buf, return ret; } +#undef _PE +#define _PE(code, str) str +static const char * const pevent_error_str[] = { + PEVENT_ERRORS +}; +#undef _PE + +int pevent_strerror(struct pevent *pevent, enum pevent_errno errnum, + char *buf, size_t buflen) +{ + int idx; + const char *msg; + + if (errnum >= 0) { + strerror_r(errnum, buf, buflen); + return 0; + } + + if (errnum <= __PEVENT_ERRNO__START || + errnum >= __PEVENT_ERRNO__END) + return -1; + + idx = errnum - __PEVENT_ERRNO__START; + msg = pevent_error_str[idx]; + + switch (errnum) { + case PEVENT_ERRNO__MEM_ALLOC_FAILED: + case PEVENT_ERRNO__PARSE_EVENT_FAILED: + case PEVENT_ERRNO__READ_ID_FAILED: + case PEVENT_ERRNO__READ_FORMAT_FAILED: + case PEVENT_ERRNO__READ_PRINT_FAILED: + case PEVENT_ERRNO__OLD_FTRACE_ARG_FAILED: + snprintf(buf, buflen, "%s", msg); + break; + + default: + /* cannot reach here */ + break; + } + + return 0; +} + int get_field_val(struct trace_seq *s, struct format_field *field, const char *name, struct pevent_record *record, unsigned long long *val, int err) diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h index 3c48229..527df03 100644 --- a/tools/lib/traceevent/event-parse.h +++ b/tools/lib/traceevent/event-parse.h @@ -345,6 +345,16 @@ enum pevent_flag { PEVENT_NSEC_OUTPUT = 1, /* output in NSECS */ }; +#define PEVENT_ERRORS \ + _PE(MEM_ALLOC_FAILED, "failed to allocate memory"), \ + _PE(PARSE_EVENT_FAILED, "failed to parse event"), \ + _PE(READ_ID_FAILED, "failed to read event id"), \ + _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") + +#undef _PE +#define _PE(__code, __str) PEVENT_ERRNO__ ## __code enum pevent_errno { PEVENT_ERRNO__SUCCESS = 0, @@ -357,15 +367,11 @@ enum pevent_errno { */ __PEVENT_ERRNO__START = -100000, - PEVENT_ERRNO__MEM_ALLOC_FAILED = __PEVENT_ERRNO__START, - PEVENT_ERRNO__PARSE_EVENT_FAILED, - PEVENT_ERRNO__READ_ID_FAILED, - PEVENT_ERRNO__READ_FORMAT_FAILED, - PEVENT_ERRNO__READ_PRINT_FAILED, - PEVENT_ERRNO__OLD_FTRACE_ARG_FAILED, + PEVENT_ERRORS, __PEVENT_ERRNO__END, }; +#undef _PE struct cmdline; struct cmdline_list; @@ -583,6 +589,8 @@ int pevent_data_pid(struct pevent *pevent, struct pevent_record *rec); const char *pevent_data_comm_from_pid(struct pevent *pevent, int pid); void pevent_event_info(struct trace_seq *s, struct event_format *event, struct pevent_record *record); +int pevent_strerror(struct pevent *pevent, enum pevent_errno errnum, + char *buf, size_t buflen); struct event_format **pevent_list_events(struct pevent *pevent, enum event_sort_type); struct format_field **pevent_event_common_fields(struct event_format *event); |