1 /* $NetBSD: compat___sigaction14_sigtramp.c,v 1.1 2021/11/01 05:53:45 thorpej 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 1.1 2021/11/01 05:53:45 thorpej 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 #define C(a,b) __CONCAT(a,b) 45 #define __SIGTRAMP_SIGCONTEXT \ 46 C(__sigtramp_sigcontext_,__SIGTRAMP_SIGCONTEXT_VERSION) 47 #define __SIGTRAMP_SIGINFO \ 48 C(__sigtramp_siginfo_,__SIGTRAMP_SIGINFO_VERSION) 49 50 __weak_alias(__sigaction14, __libc_sigaction14) 51 52 #define __LIBC12_SOURCE__ 53 54 /* 55 * The symbol must remain, but we don't want this exposed in a header 56 * anywhere, so the prototype goes here. 57 */ 58 int __libc_sigaction14(int, const struct sigaction *, struct sigaction *); 59 60 int 61 __libc_sigaction14(int sig, const struct sigaction *act, struct sigaction *oact) 62 { 63 extern const char __SIGTRAMP_SIGINFO[]; 64 65 /* 66 * If no sigaction, use the "default" trampoline since it won't 67 * be used. 68 */ 69 if (act == NULL) 70 return __sigaction_sigtramp(sig, act, oact, NULL, 0); 71 72 #if defined(__HAVE_STRUCT_SIGCONTEXT) && defined(__LIBC12_SOURCE__) 73 /* 74 * We select the non-SA_SIGINFO trampoline if SA_SIGINFO is not 75 * set in the sigaction. 76 */ 77 if ((act->sa_flags & SA_SIGINFO) == 0) { 78 extern const char __SIGTRAMP_SIGCONTEXT[]; 79 int sav = errno; 80 int rv = __sigaction_sigtramp(sig, act, oact, 81 __SIGTRAMP_SIGCONTEXT, __SIGTRAMP_SIGCONTEXT_VERSION); 82 if (rv >= 0 || errno != EINVAL) 83 return rv; 84 errno = sav; 85 } 86 #endif 87 88 /* 89 * If SA_SIGINFO was specified or the compatibility trampolines 90 * can't be used, use the siginfo trampoline. 91 */ 92 return __sigaction_sigtramp(sig, act, oact, 93 __SIGTRAMP_SIGINFO, __SIGTRAMP_SIGINFO_VERSION); 94 } 95