musl/src/signal/sigemptyset.c

#include <signal.h>
#include <string.h>

int sigemptyset(sigset_t *set)
{
	set->__bits[0] = 0;
	if (sizeof(long)==4) set->__bits[1] = 0;
	return 0;
}
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`#include <signal.h>`
			`#include <string.h>`

			`int sigemptyset(sigset_t *set)`
			`{`
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 sigset() 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			`set->__bits[0] = 0;`
			`if (sizeof(long)==4) set->__bits[1] = 0;`
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`return 0;`
			`}`