lib/libc/arch/sparc64/sys/__sigaction14_sigtramp.c

   1 /*      $NetBSD: __sigaction14_sigtramp.c,v 1.9 2009/01/11 02:46:24 christos 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 1.9 2009/01/11 02:46:24 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
  45 int
  46 __libc_sigaction14(int sig, const struct sigaction *act, struct sigaction *oact)
  47 {
  48         extern void __sigtramp_siginfo_2(void);
  49
  50 #ifdef __LIBC12_SOURCE__
  51         /*
  52          * We select the compatibility SIGCONTEXT trampoline if SA_SIGINFO
  53          * is not set in the sigaction.
  54          */
  55         if (act && (act->sa_flags & SA_SIGINFO) == 0) {
  56                 extern void __sigtramp_sigcontext_1(void);
  57                 int sav = errno;
  58                 int rv =  __sigaction_sigtramp(sig, act, oact,
  59                                            __sigtramp_sigcontext_1, 1);
  60                 /*
  61                  * EINVAL might indicate that trampoline version 1 is
  62                  * not supported by the kernel; fall back on native
  63                  * SIGINFO trampoline.
  64                  */
  65                 if (rv >= 0 || errno != EINVAL)
  66                         return rv;
  67                 errno = sav;
  68         }
  69 #endif
  70
  71         return __sigaction_sigtramp(sig, act, oact, __sigtramp_siginfo_2, 2);
  72 }