lib/libc/arch/sh3/sys/__sigaction14_sigtramp.c

   1 /*      $NetBSD: __sigaction14_sigtramp.c,v 1.7 2006/05/18 17:54:19 christos Exp $      */
   2
   3 /*-
   4  * Copyright (c) 2003 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 2006/05/18 17:54:19 christos Exp $");
  35 #endif /* LIBC_SCCS and not lint */
  36
  37 #include <sys/types.h>
  38 #include <signal.h>
  39 #include <errno.h>
  40
  41 #include "extern.h"
  42
  43 __weak_alias(__sigaction14, __libc_sigaction14)
  44 #ifdef __LIBC12_SOURCE__
  45 extern const int __sigtramp_sigcontext_1[]
  46     __weak_reference(__sigtramp_sigcontext_1);
  47 #endif
  48
  49 int
  50 __libc_sigaction14(int sig, const struct sigaction *act, struct sigaction *oact)
  51 {
  52         extern int __sigtramp_siginfo_2[];
  53
  54 #ifdef __LIBC12_SOURCE__
  55         /*
  56          * We select the compatibility SIGCONTEXT trampoline if SA_SIGINFO
  57          * is not set in the sigaction.
  58          */
  59         if (act && (act->sa_flags & SA_SIGINFO) == 0) {
  60                 extern int __sigtramp_sigcontext_1[];
  61                 int sav = errno;
  62                 int rv =  __sigaction_sigtramp(sig, act, oact,
  63                                            __sigtramp_sigcontext_1, 1);
  64                 /*
  65                  * EINVAL might indicate that trampoline version 1 is
  66                  * not supported by the kernel; fall back on native
  67                  * SIGINFO trampoline.
  68                  */
  69                 if (rv >= 0 || errno != EINVAL)
  70                         return rv;
  71                 errno = sav;
  72         }
  73 #endif
  74
  75         return __sigaction_sigtramp(sig, act, oact, __sigtramp_siginfo_2, 2);
  76 }