Subversion Repositories planix.SVN

#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;
}