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Annotation of 40BSD/cmd/ucbmail/Signal.c, revision 1.1

1.1     ! root        1: #
        !             2: 
        !             3: #include <signal.h>
        !             4: 
        !             5: /*
        !             6:  * The following is for systems with botched signal() system entries
        !             7:  * which don't return the proper value for the previous signal.
        !             8:  */
        !             9: 
        !            10: int    oldsigs[17];
        !            11: 
        !            12: int
        !            13: (*Signal())(sig, spot)
        !            14:        int spot;
        !            15: {
        !            16:        int ret;
        !            17: 
        !            18:        /* printf("Signal(%d, %.1o)\n", sig, spot); */
        !            19:        if (sig < 1 || sig > 16)
        !            20:                return(-1);
        !            21:        ret = oldsigs[sig];
        !            22:        oldsigs[sig] = (int) spot;
        !            23:        signal(sig, spot);
        !            24:        return(ret);
        !            25: }
        !            26: 
        !            27: Siginit()
        !            28: {
        !            29:        register int i;
        !            30: 
        !            31:        for (i = 1; i < 17; i++) {
        !            32:                oldsigs[i] = (int) signal(i, SIG_IGN);
        !            33:                signal(i, (int (*)()) oldsigs[i]);
        !            34:        }
        !            35: }

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