1/* $OpenBSD: signalvar.h,v 1.58 2025/03/10 09:28:57 claudio Exp $ */
2/* $NetBSD: signalvar.h,v 1.17 1996/04/22 01:23:31 christos Exp $ */
3
4/*
5 * Copyright (c) 1991, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)signalvar.h 8.3 (Berkeley) 1/4/94
33 */
34
35#ifndef _SYS_SIGNALVAR_H_ /* tmp for user.h */
36#define _SYS_SIGNALVAR_H_
37
38/*
39 * Kernel signal definitions and data structures,
40 * not exported to user programs.
41 */
42
43/*
44 * Process signal actions and state, needed only within the process
45 * (not necessarily resident).
46 *
47 * Locks used to protect struct members in struct sigacts:
48 * a atomic operations
49 * m this process' `ps_mtx'
50 */
51struct sigacts {
52 sig_t ps_sigact[NSIG]; /* [m] disposition of signals */
53 sigset_t ps_catchmask[NSIG]; /* [m] signals to be blocked */
54 sigset_t ps_sigonstack; /* [m] signals to take on sigstack */
55 sigset_t ps_sigintr; /* [m] signals interrupt syscalls */
56 sigset_t ps_sigreset; /* [m] signals that reset when caught */
57 sigset_t ps_siginfo; /* [m] signals that provide siginfo */
58 sigset_t ps_sigignore; /* [m] signals being ignored */
59 sigset_t ps_sigcatch; /* [m] signals being caught by user */
60 int ps_sigflags; /* [a] signal flags, below */
61};
62
63/* signal flags */
64#define SAS_NOCLDSTOP 0x01 /* No SIGCHLD when children stop. */
65#define SAS_NOCLDWAIT 0x02 /* No zombies if child dies */
66
67/* additional signal action values, used only temporarily/internally */
68#define SIG_CATCH (void (*)(int))2
69#define SIG_HOLD (void (*)(int))3
70
71/*
72 * Check if process p has an unmasked signal pending.
73 * Return mask of pending signals.
74 */
75#define SIGPENDING(p) \
76 (((p)->p_siglist | (p)->p_p->ps_siglist) & ~(p)->p_sigmask)
77
78/*
79 * Signal properties and actions.
80 */
81#define SA_KILL 0x01 /* terminates process by default */
82#define SA_CORE 0x02 /* ditto and coredumps */
83#define SA_STOP 0x04 /* suspend process */
84#define SA_TTYSTOP 0x08 /* ditto, from tty */
85#define SA_IGNORE 0x10 /* ignore by default */
86#define SA_CONT 0x20 /* continue if suspended */
87#define SA_CANTMASK 0x40 /* non-maskable, catchable */
88
89#define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP))
90
91#ifdef _KERNEL
92enum signal_type { SPROCESS, STHREAD };
93
94struct sigio_ref;
95
96struct sigctx {
97 sig_t sig_action;
98 sigset_t sig_catchmask;
99 int sig_onstack;
100 int sig_intr;
101 int sig_reset;
102 int sig_info;
103 int sig_ignore;
104 int sig_catch;
105 int sig_stop;
106};
107
108/*
109 * Machine-independent functions:
110 */
111int coredump(struct proc *p);
112void execsigs(struct proc *p);
113int cursig(struct proc *p, struct sigctx *, int);
114void pgsigio(struct sigio_ref *sir, int sig, int checkctty);
115void pgsignal(struct pgrp *pgrp, int sig, int checkctty);
116void psignal(struct proc *p, int sig);
117void ptsignal(struct proc *p, int sig, enum signal_type type);
118void prsignal(struct process *pr, int sig);
119void trapsignal(struct proc *p, int sig, u_long code, int type,
120 union sigval val);
121__dead void sigexit(struct proc *, int);
122void sigabort(struct proc *);
123int sigismasked(struct proc *, int);
124int sigonstack(size_t);
125int killpg1(struct proc *, int, int, int);
126
127void signal_init(void);
128
129void sigstkinit(struct sigaltstack *);
130struct sigacts *sigactsinit(struct process *);
131void sigactsfree(struct sigacts *);
132void siginit(struct sigacts *);
133
134/*
135 * Machine-dependent functions:
136 */
137int sendsig(sig_t _catcher, int _sig, sigset_t _mask, const siginfo_t *_si,
138 int _info, int _onstack);
139#endif /* _KERNEL */
140#endif /* !_SYS_SIGNALVAR_H_ */