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    SubjectRe: [PATCH 01/11] perf tools: Introduce struct perf_maps_opts
    Em Mon, Feb 13, 2012 at 11:50:29AM -0700, David Ahern escreveu:
    > The cleanup might make my multiple tid/pid patch easier: e.g.,
    > struct perf_target{
    > ...
    > char errmsg[128];
    > };
    > Then if the tid/pid string parsing fails in perf_evlist__create_maps and
    > friends the errmsg can be put into the buffer for the callers to get a
    > more useful message to the user as to what happened.
    > Today's perf if you give it an invalid pid, scandir fails and the
    > command spits out the usage statement. Which is completely confusing --
    > ie., not clear that the command failed b/c the pid does not exist.

    Humm, ok, but then I think we should have an enum + a strerror(3)
    equivalent, i.e.:

    enum perf_target_error perf_evlist__create_maps(...);

    int perf_target__strerror(struct perf_target *target, int errnum,
    char *buf, size_t buflen);

    Please see 'man strerror_r", and make it work like the POSIX compliant

    Ok, so it may be better to first process Kim's patches and then you
    rework yours?

    - Arnaldo

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