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Annotation of 42BSD/bin/csh/sh.sig.c, revision 1.1

1.1     ! root        1: static char *sccsid = "@(#)sh.sig.c    4.1 (Berkeley) 83/06/11";
        !             2: 
        !             3: /*
        !             4:  * C shell - old jobs library sigrelse meant unblock mask
        !             5:  *          AND reinstall handler, so we simulate it here.
        !             6:  */
        !             7: #include <signal.h>
        !             8: 
        !             9: #define        mask(s) (1 << ((s)-1))
        !            10: 
        !            11: static int (*actions[NSIG])();
        !            12: static int achanged[NSIG];
        !            13: 
        !            14: /*
        !            15:  * Perform action and save handler state.
        !            16:  */
        !            17: sigset(s, a)
        !            18:        int s, (*a)();
        !            19: {
        !            20: 
        !            21:        actions[s] = a;
        !            22:        achanged[s] = 0;
        !            23:        return ((int)signal(s, a));
        !            24: }
        !            25: 
        !            26: /*
        !            27:  * Release any masking of signal and
        !            28:  * reinstall handler in case someone's
        !            29:  * done a sigignore.
        !            30:  */
        !            31: sigrelse(s)
        !            32:        int s;
        !            33: {
        !            34: 
        !            35:        if (achanged[s]) {
        !            36:                signal(s, actions[s]);
        !            37:                achanged[s] = 0;
        !            38:        }
        !            39:        sigsetmask(sigblock(0) &~ mask(s));
        !            40: }
        !            41: 
        !            42: /*
        !            43:  * Ignore signal but maintain state so sigrelse
        !            44:  * will restore handler.  We avoid the overhead
        !            45:  * of doing a signal for each sigrelse call by
        !            46:  * marking the signal's action as changed.
        !            47:  */
        !            48: sigignore(s)
        !            49:        int s;
        !            50: {
        !            51: 
        !            52:        if (actions[s] != SIG_IGN)
        !            53:                achanged[s] = 1;
        !            54:        signal(s, SIG_IGN);
        !            55: }

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