1 /* $NetBSD: linux_sig_notalpha.c,v 1.41 2021/11/25 03:08:04 ryo Exp $ */
2
3 /*-
4 * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Frank van der Linden and Eric Haszlakiewicz.
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 /*
33 * heavily from: svr4_signal.c,v 1.7 1995/01/09 01:04:21 christos Exp
34 */
35
36 #include <sys/cdefs.h>
37 __KERNEL_RCSID(0, "$NetBSD: linux_sig_notalpha.c,v 1.41 2021/11/25 03:08:04 ryo Exp $");
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/proc.h>
42 #include <sys/filedesc.h>
43 #include <sys/mount.h>
44 #include <sys/kernel.h>
45 #include <sys/signal.h>
46 #include <sys/signalvar.h>
47
48 #include <sys/syscallargs.h>
49
50 #include <compat/linux/common/linux_types.h>
51 #include <compat/linux/common/linux_signal.h>
52 #include <compat/linux/common/linux_util.h>
53 #include <compat/linux/common/linux_ipc.h>
54 #include <compat/linux/common/linux_sem.h>
55
56 #include <compat/linux/linux_syscallargs.h>
57
58 /* Used on: arm, i386, m68k, mips, sparc, sparc64 */
59 /* Partly used on: aarch64, amd64 */
60 /* Not used on: alpha */
61
62 #if !defined(__aarch64__) && !defined(__amd64__)
63 /*
64 * The Linux signal() system call. I think that the signal() in the C
65 * library actually calls sigaction, so I doubt this one is ever used.
66 * But hey, it can't hurt having it here. The same restrictions as for
67 * sigaction() apply.
68 */
69 int
linux_sys_signal(struct lwp * l,const struct linux_sys_signal_args * uap,register_t * retval)70 linux_sys_signal(struct lwp *l, const struct linux_sys_signal_args *uap, register_t *retval)
71 {
72 /* {
73 syscallarg(int) signum;
74 syscallarg(linux_handler_t) handler;
75 } */
76 struct sigaction nbsa, obsa;
77 int error, sig;
78
79 *retval = -1;
80 sig = SCARG(uap, signum);
81 if (sig < 0 || sig >= LINUX__NSIG)
82 return (EINVAL);
83
84 nbsa.sa_handler = SCARG(uap, handler);
85 sigemptyset(&nbsa.sa_mask);
86 nbsa.sa_flags = SA_RESETHAND | SA_NODEFER;
87 error = sigaction1(l, linux_to_native_signo[sig],
88 &nbsa, &obsa, NULL, 0);
89 if (error == 0)
90 *retval = (int)(long)obsa.sa_handler; /* XXXmanu cast */
91 return (error);
92 }
93
94
95 /* ARGSUSED */
96 int
linux_sys_siggetmask(struct lwp * l,const void * v,register_t * retval)97 linux_sys_siggetmask(struct lwp *l, const void *v, register_t *retval)
98 {
99 struct proc *p = l->l_proc;
100 sigset_t bss;
101 linux_old_sigset_t lss;
102 int error;
103
104 mutex_enter(p->p_lock);
105 error = sigprocmask1(l, SIG_SETMASK, 0, &bss);
106 mutex_exit(p->p_lock);
107 if (error)
108 return (error);
109 native_to_linux_old_sigset(&lss, &bss);
110 *retval = lss;
111 return (0);
112 }
113
114 /*
115 * The following three functions fiddle with a process' signal mask.
116 * Convert the signal masks because of the different signal
117 * values for Linux. The need for this is the reason why
118 * they are here, and have not been mapped directly.
119 */
120 int
linux_sys_sigsetmask(struct lwp * l,const struct linux_sys_sigsetmask_args * uap,register_t * retval)121 linux_sys_sigsetmask(struct lwp *l, const struct linux_sys_sigsetmask_args *uap, register_t *retval)
122 {
123 /* {
124 syscallarg(linux_old_sigset_t) mask;
125 } */
126 sigset_t nbss, obss;
127 linux_old_sigset_t nlss, olss;
128 struct proc *p = l->l_proc;
129 int error;
130
131 nlss = SCARG(uap, mask);
132 linux_old_to_native_sigset(&nbss, &nlss);
133 mutex_enter(p->p_lock);
134 error = sigprocmask1(l, SIG_SETMASK, &nbss, &obss);
135 mutex_exit(p->p_lock);
136 if (error)
137 return (error);
138 native_to_linux_old_sigset(&olss, &obss);
139 *retval = olss;
140 return (0);
141 }
142
143 int
linux_sys_sigprocmask(struct lwp * l,const struct linux_sys_sigprocmask_args * uap,register_t * retval)144 linux_sys_sigprocmask(struct lwp *l, const struct linux_sys_sigprocmask_args *uap, register_t *retval)
145 {
146 /* {
147 syscallarg(int) how;
148 syscallarg(const linux_old_sigset_t *) set;
149 syscallarg(linux_old_sigset_t *) oset;
150 } */
151
152 return(linux_sigprocmask1(l, SCARG(uap, how),
153 SCARG(uap, set), SCARG(uap, oset)));
154 }
155 #endif /* !__amd64__ */
156
157 /*
158 * The deprecated pause(2), which is really just an instance
159 * of sigsuspend(2).
160 */
161 int
linux_sys_pause(struct lwp * l,const void * v,register_t * retval)162 linux_sys_pause(struct lwp *l, const void *v, register_t *retval)
163 {
164
165 return (sigsuspend1(l, 0));
166 }
167
168