4.3BSD - /usr/src/lib/libc/gen/signal.c

   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: }

Defined variables