1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #if defined(LIBC_SCCS) && !defined(lint)
33 static char sccsid[] = "@(#)sigcompat.c 8.1 (Berkeley) 6/2/93";
34 #endif /* LIBC_SCCS and not lint */
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: stable/12/lib/libc/compat-43/sigcompat.c 326025 2017-11-20 19:49:47Z pfg $");
37
38 #include "namespace.h"
39 #include <sys/param.h>
40 #include <errno.h>
41 #include <signal.h>
42 #include <string.h>
43 #include "un-namespace.h"
44 #include "libc_private.h"
45
46 int
sigvec(int signo,struct sigvec * sv,struct sigvec * osv)47 sigvec(int signo, struct sigvec *sv, struct sigvec *osv)
48 {
49 struct sigaction sa, osa;
50 struct sigaction *sap, *osap;
51 int ret;
52
53 if (sv != NULL) {
54 sa.sa_handler = sv->sv_handler;
55 sa.sa_flags = sv->sv_flags ^ SV_INTERRUPT;
56 sigemptyset(&sa.sa_mask);
57 sa.sa_mask.__bits[0] = sv->sv_mask;
58 sap = &sa;
59 } else
60 sap = NULL;
61 osap = osv != NULL ? &osa : NULL;
62 ret = __libc_sigaction(signo, sap, osap);
63 if (ret == 0 && osv != NULL) {
64 osv->sv_handler = osa.sa_handler;
65 osv->sv_flags = osa.sa_flags ^ SV_INTERRUPT;
66 osv->sv_mask = osa.sa_mask.__bits[0];
67 }
68 return (ret);
69 }
70
71 int
sigsetmask(int mask)72 sigsetmask(int mask)
73 {
74 sigset_t set, oset;
75 int n;
76
77 sigemptyset(&set);
78 set.__bits[0] = mask;
79 n = __libc_sigprocmask(SIG_SETMASK, &set, &oset);
80 if (n)
81 return (n);
82 return (oset.__bits[0]);
83 }
84
85 int
sigblock(int mask)86 sigblock(int mask)
87 {
88 sigset_t set, oset;
89 int n;
90
91 sigemptyset(&set);
92 set.__bits[0] = mask;
93 n = __libc_sigprocmask(SIG_BLOCK, &set, &oset);
94 if (n)
95 return (n);
96 return (oset.__bits[0]);
97 }
98
99 int
sigpause(int mask)100 sigpause(int mask)
101 {
102 sigset_t set;
103
104 sigemptyset(&set);
105 set.__bits[0] = mask;
106 return (__libc_sigsuspend(&set));
107 }
108
109 int
xsi_sigpause(int sig)110 xsi_sigpause(int sig)
111 {
112 sigset_t set;
113
114 if (__libc_sigprocmask(SIG_BLOCK, NULL, &set) == -1)
115 return (-1);
116 if (sigdelset(&set, sig) == -1)
117 return (-1);
118 return (__libc_sigsuspend(&set));
119 }
120
121 int
sighold(int sig)122 sighold(int sig)
123 {
124 sigset_t set;
125
126 sigemptyset(&set);
127 if (sigaddset(&set, sig) == -1)
128 return (-1);
129 return (__libc_sigprocmask(SIG_BLOCK, &set, NULL));
130 }
131
132 int
sigignore(int sig)133 sigignore(int sig)
134 {
135 struct sigaction sa;
136
137 bzero(&sa, sizeof(sa));
138 sa.sa_handler = SIG_IGN;
139 return (__libc_sigaction(sig, &sa, NULL));
140 }
141
142 int
sigrelse(int sig)143 sigrelse(int sig)
144 {
145 sigset_t set;
146
147 sigemptyset(&set);
148 if (sigaddset(&set, sig) == -1)
149 return (-1);
150 return (__libc_sigprocmask(SIG_UNBLOCK, &set, NULL));
151 }
152
153 void
sigset(int sig,void (* disp)(int))154 (*sigset(int sig, void (*disp)(int)))(int)
155 {
156 sigset_t set, pset;
157 struct sigaction sa, psa;
158
159 sigemptyset(&set);
160 if (sigaddset(&set, sig) == -1)
161 return (SIG_ERR);
162 if (__libc_sigprocmask(SIG_BLOCK, NULL, &pset) == -1)
163 return (SIG_ERR);
164 if ((__sighandler_t *)disp == SIG_HOLD) {
165 if (__libc_sigprocmask(SIG_BLOCK, &set, &pset) == -1)
166 return (SIG_ERR);
167 if (sigismember(&pset, sig))
168 return (SIG_HOLD);
169 else {
170 if (__libc_sigaction(sig, NULL, &psa) == -1)
171 return (SIG_ERR);
172 return (psa.sa_handler);
173 }
174 } else {
175 if (__libc_sigprocmask(SIG_UNBLOCK, &set, &pset) == -1)
176 return (SIG_ERR);
177 }
178
179 bzero(&sa, sizeof(sa));
180 sa.sa_handler = disp;
181 if (__libc_sigaction(sig, &sa, &psa) == -1)
182 return (SIG_ERR);
183 if (sigismember(&pset, sig))
184 return (SIG_HOLD);
185 else
186 return (psa.sa_handler);
187 }
188