lib/libc/arch/arm/sys/__sigaction14_sigtramp.c

   1 /*      $NetBSD: __sigaction14_sigtramp.c,v 1.7 2008/04/28 20:22:55 martin Exp $        */
   2
   3 /*-
   4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jason R. Thorpe.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 __RCSID("$NetBSD: __sigaction14_sigtramp.c,v 1.7 2008/04/28 20:22:55 martin Exp $");
  35 #endif /* LIBC_SCCS and not lint */
  36
  37 #include <sys/types.h>
  38 #include <stddef.h>
  39 #include <signal.h>
  40 #include <errno.h>
  41
  42 #include "extern.h"
  43
  44 __weak_alias(__sigaction14, __libc_sigaction14)
  45
  46 int
  47 __libc_sigaction14(int sig, const struct sigaction *act, struct sigaction *oact)
  48 {
  49         extern const int __sigtramp_siginfo_2[];
  50
  51         /*
  52          * If no sigaction, use the "default" trampoline since it won't
  53          * be used.
  54          */
  55         if (act == NULL)
  56                 return  __sigaction_sigtramp(sig, act, oact, NULL, 0);
  57
  58 #ifdef __LIBC12_SOURCE__
  59         /*
  60          * We select the non-SA_SIGINFO trampoline if SA_SIGINFO is not
  61          * set in the sigaction.
  62          */
  63         if ((act->sa_flags & SA_SIGINFO) == 0) {
  64                 extern const int __sigtramp_sigcontext_1[];
  65                 int sav = errno;
  66                 int rv =  __sigaction_sigtramp(sig, act, oact,
  67                     __sigtramp_sigcontext_1, 1);
  68                 if (rv >= 0 || errno != EINVAL)
  69                         return rv;
  70                 errno = sav;
  71         }
  72 #endif
  73
  74         /*
  75          * If SA_SIGINFO was specificed or the compatibility trampolines
  76          * can't be used, use the siginfo trampoline.
  77          */
  78         return __sigaction_sigtramp(sig, act, oact, __sigtramp_siginfo_2, 2);
  79 }