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