Messages in this thread | | | Subject | Re: [PATCH 3/3] tools lib traceevent: Introduce pevent_strerror | From | Steven Rostedt <> | Date | Fri, 15 Jun 2012 08:39:31 -0400 |
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On Tue, 2012-06-12 at 16:42 +0900, Namhyung Kim wrote:
> +/* > + * This must have a same ordering as the enum pevent_errno. > + */ > +static const char * const pevent_error_str[] = { > + "failed to allocate memory", > + "failed to parse event", > + "failed to read event id", > + "failed to read event format", > + "failed to read event print fmt", > + "failed to allocate field name for ftrace", > +}; > +
Here's a little macro trick to keep the strings and enums always in sync:
#define __PEVENT_ERRNO_CODES \ _C(PEVENT_ERRNO__MEM_ALLOC_FAILED, "failed to allocate memory"), \ _C(PEVENT_ERRNO__PARSE_EVENT_FAILED, "failed to parse event"), \ _C(PEVENT_ERRNO__READ_ID_FAILED, "failed to read event id"), \ _C(PEVENT_ERRNO__READ_FORMAT_FAILED, "failed to read event format"), \ _C(PEVENT_ERRNO__READ_PRINT_FAILED, "failed to read event print fmt"),\ _C(PEVENT_ERRNO__OLD_FTRACE_ARG_FAILED,"failed to allocate field name for ftrace"),
#undef _C #define _C(a,b) b static const char * const pevent_error_str[] = { __PEVENT_ERROR_CODES };
#undef _C #define _C(a, b) a
enum pevent_errno { __PEVENT_ERRNO__BEFORE_START = -100000 - 1, __PEVENT_ERRNO_CODES __PEVENT_ERRNO__END, };
#define __PEVENT_ERRNO__START (__PEVENT_ERRNO__BEFORE_START + 1)
Just saying ;-)
-- Steve
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