2011-02-12 00:22:29 -05:00
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#include <signal.h>
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#include <string.h>
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int sigemptyset(sigset_t *set)
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{
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overhaul implementation-internal signal protections
the new approach relies on the fact that the only ways to create
sigset_t objects without invoking UB are to use the sig*set()
functions, or from the masks returned by sigprocmask, sigaction, etc.
or in the ucontext_t argument to a signal handler. thus, as long as
sigfillset and sigaddset avoid adding the "protected" signals, there
is no way the application will ever obtain a sigset_t including these
bits, and thus no need to add the overhead of checking/clearing them
when sigprocmask or sigaction is called.
note that the old code actually *failed* to remove the bits from
sa_mask when sigaction was called.
the new implementations are also significantly smaller, simpler, and
faster due to ignoring the useless "GNU HURD signals" 65-1024, which
are not used and, if there's any sanity in the world, never will be
used.
2011-05-07 23:23:58 -04:00
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set->__bits[0] = 0;
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2013-09-16 12:58:51 -04:00
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if (sizeof(long)==4 || _NSIG > 65) set->__bits[1] = 0;
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if (sizeof(long)==4 && _NSIG > 65) {
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set->__bits[2] = 0;
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set->__bits[3] = 0;
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}
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2011-02-12 00:22:29 -05:00
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return 0;
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}
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