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      1 /*	$NetBSD: compat___sigaction14_sigtramp.c,v 1.2 2024/01/20 14:52:46 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: compat___sigaction14_sigtramp.c,v 1.2 2024/01/20 14:52:46 christos Exp $");
     35 #endif /* LIBC_SCCS and not lint */
     36 
     37 #define __LIBC12_SOURCE__
     38 #include <sys/types.h>
     39 #include <stddef.h>
     40 #include <sys/time.h>
     41 #include <compat/sys/time.h>
     42 #include <signal.h>
     43 #include <compat/include/signal.h>
     44 #include <errno.h>
     45 
     46 #include "extern.h"
     47 
     48 __weak_alias(__sigaction14, __libc_sigaction14)
     49 
     50 int
     51 __libc_sigaction14(int sig, const struct sigaction *act, struct sigaction *oact)
     52 {
     53 
     54 	/*
     55 	 * If no sigaction, use the "default" trampoline since it won't
     56 	 * be used.
     57 	 */
     58 	if (act == NULL)
     59 		return  __sigaction_sigtramp(sig, act, oact, NULL, 0);
     60 
     61 #if defined(__HAVE_STRUCT_SIGCONTEXT) &&  defined(__LIBC12_SOURCE__)
     62 	/*
     63 	 * We select the non-SA_SIGINFO trampoline if SA_SIGINFO is not
     64 	 * set in the sigaction.
     65 	 */
     66 	if ((act->sa_flags & SA_SIGINFO) == 0) {
     67 		int sav = errno;
     68 		int rv =  __sigaction_sigtramp(sig, act, oact,
     69 		    __SIGTRAMP_SIGCONTEXT, __SIGTRAMP_SIGCONTEXT_VERSION);
     70 		if (rv >= 0 || errno != EINVAL)
     71 			return rv;
     72 		errno = sav;
     73 	}
     74 #endif
     75 
     76 	/*
     77 	 * If SA_SIGINFO was specified or the compatibility trampolines
     78 	 * can't be used, use the siginfo trampoline.
     79 	 */
     80 	return __sigaction_sigtramp(sig, act, oact,
     81 	    __SIGTRAMP_SIGINFO, __SIGTRAMP_SIGINFO_VERSION);
     82 }
     83