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Annotation of 43BSD/lib/libc/gen/signal.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1985 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #if defined(LIBC_SCCS) && !defined(lint)
        !             8: static char sccsid[] = "@(#)signal.c   5.2 (Berkeley) 3/9/86";
        !             9: #endif LIBC_SCCS and not lint
        !            10: 
        !            11: /*
        !            12:  * Almost backwards compatible signal.
        !            13:  */
        !            14: #include <signal.h>
        !            15: 
        !            16: int (*
        !            17: signal(s, a))()
        !            18:        int s, (*a)();
        !            19: {
        !            20:        struct sigvec osv, sv;
        !            21:        static int mask[NSIG];
        !            22:        static int flags[NSIG];
        !            23: 
        !            24:        sv.sv_handler = a;
        !            25:        sv.sv_mask = mask[s];
        !            26:        sv.sv_flags = flags[s];
        !            27:        if (sigvec(s, &sv, &osv) < 0)
        !            28:                return (BADSIG);
        !            29:        if (sv.sv_mask != osv.sv_mask || sv.sv_flags != osv.sv_flags) {
        !            30:                mask[s] = sv.sv_mask = osv.sv_mask;
        !            31:                flags[s] = sv.sv_flags = osv.sv_flags;
        !            32:                if (sigvec(s, &sv, 0) < 0)
        !            33:                        return (BADSIG);
        !            34:        }
        !            35:        return (osv.sv_handler);
        !            36: }

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