True. Ironically, one occurence of sigisemptyset (out of two) is in
hush.c and tries to shortcircuit exactly that kind of iteration, at the
start of the loop in check_and_run_traps(). Basically, that one can be
ifdef'ed out if HAVE_SIGISEMPTYSET is undefined.
Rich Felker wrote:
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.
A valid fallback for sigisemptyset would be something like:
int empty = 1, i;
for (i=1; i<_NSIG; i++) {
if (sigismember(set, i)>0) {
empty = 0;
break;
}
}
If _NSIG is unknown (not defined), sizeof(sigset_t)*8+1 could work in
its place, assuming signals are numbered sequentially.
-dborca
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