[PATCH 3/3] platform: fix missing sigisemptyset

[Denys Vlasenko]

On Wed, Nov 27, 2013 at 2:46 AM, Rich Felker <dalias at aerifal.cx> wrote:
> On Tue, Nov 26, 2013 at 10:01:36PM +0200, Daniel Borca wrote:
>> +#ifndef HAVE_SIGISEMPTYSET
>> +int sigisemptyset(sigset_t *set)
>> +{
>> +     sigset_t empty;
>> +     int ret = sigemptyset(&empty);
>> +     if (ret == 0) {
>> +             ret = !memcmp(&empty, set, sizeof(sigset_t));
>> +     }
>> +     return ret;
>> +}
>> +#endif
>
> This is not a suitable fallback implementation. It's not needed on
> musl (we provide sigisemptyset), but if this version were used, it
> would give the wrong results, because musl's sigemptyset only fills
> the first _NSIG-1 bits and ignores the remaining ~900 bits of junk in
> sigset_t.

Why does musl use such pointlessly huge sigset_t?