FreeBSD/Linux Kernel Cross Reference
sys/sys/signalvar.h
1 /* $OpenBSD: signalvar.h,v 1.54 2022/05/13 15:32:00 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 */
51 struct 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
92 enum signal_type { SPROCESS, STHREAD, SPROPAGATED };
93
94 struct sigio_ref;
95
96 struct 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 };
106
107 /*
108 * Machine-independent functions:
109 */
110 int coredump(struct proc *p);
111 void execsigs(struct proc *p);
112 int cursig(struct proc *p, struct sigctx *);
113 void pgsigio(struct sigio_ref *sir, int sig, int checkctty);
114 void pgsignal(struct pgrp *pgrp, int sig, int checkctty);
115 void psignal(struct proc *p, int sig);
116 void ptsignal(struct proc *p, int sig, enum signal_type type);
117 #define prsignal(pr,sig) ptsignal((pr)->ps_mainproc, (sig), SPROCESS)
118 void trapsignal(struct proc *p, int sig, u_long code, int type,
119 union sigval val);
120 __dead void sigexit(struct proc *, int);
121 void sigabort(struct proc *);
122 int sigismasked(struct proc *, int);
123 int sigonstack(size_t);
124 int killpg1(struct proc *, int, int, int);
125
126 void signal_init(void);
127
128 void sigstkinit(struct sigaltstack *);
129 struct sigacts *sigactsinit(struct process *);
130 void sigactsfree(struct sigacts *);
131 void siginit(struct sigacts *);
132
133 /*
134 * Machine-dependent functions:
135 */
136 int sendsig(sig_t _catcher, int _sig, sigset_t _mask, const siginfo_t *_si,
137 int _info, int _onstack);
138 #endif /* _KERNEL */
139 #endif /* !_SYS_SIGNALVAR_H_ */
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