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WebSVN – planix.SVN – Blame – /os/branches/feature_fixcpp/sys/src/ape/lib/ap/posix/sigset.c – Rev 2

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#include <signal.h>
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#include <errno.h>
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/*
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 * sigsets are 32-bit longs.  if the 2<<(i-1) bit is on,
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 * the signal #define'd as i in signal.h is inluded.
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 */
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static sigset_t stdsigs = SIGHUP|SIGINT|SIGQUIT|SIGILL|SIGABRT|SIGFPE|SIGKILL|
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		SIGSEGV|SIGPIPE|SIGALRM|SIGTERM|SIGUSR1|SIGUSR2;
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#define BITSIG(s) (2<<(s))
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int
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sigemptyset(sigset_t *set)
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{
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	*set = 0;
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	return 0;
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}
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int
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sigfillset(sigset_t *set)
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{
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	*set = stdsigs;
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	return 0;
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}
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int
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sigaddset(sigset_t *set, int signo)
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{
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	int b;
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	b = BITSIG(signo);
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	if(!(b&stdsigs)){
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		errno = EINVAL;
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		return -1;
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	}
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	*set |= b;
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	return 0;
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}
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int
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sigdelset(sigset_t *set, int signo)
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{
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	int b;
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	b = BITSIG(signo);
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	if(!(b&stdsigs)){
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		errno = EINVAL;
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		return -1;
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	}
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	*set &= ~b;
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	return 0;
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}
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int
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sigismember(sigset_t *set, int signo)
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{
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	int b;
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	b = BITSIG(signo);
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	if(!(b&stdsigs)){
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		errno = EINVAL;
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		return -1;
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	}
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	return (b&*set)? 1 : 0;
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}