FreeBSD/Linux Kernel Cross Reference
sys/sys/signal.h
1 /*
2 * Copyright (c) 1982, 1986, 1989, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
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 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)signal.h 8.4 (Berkeley) 5/4/95
39 * $FreeBSD: src/sys/sys/signal.h,v 1.9.4.1 1999/09/05 08:22:54 peter Exp $
40 */
41
42 #ifndef _SYS_SIGNAL_H_
43 #define _SYS_SIGNAL_H_
44
45 #include <sys/cdefs.h>
46 #include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */
47
48 #if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
49 #define NSIG 32 /* counting 0; could be 33 (mask is 1-32) */
50 #endif
51
52 #define SIGHUP 1 /* hangup */
53 #define SIGINT 2 /* interrupt */
54 #define SIGQUIT 3 /* quit */
55 #define SIGILL 4 /* illegal instruction (not reset when caught) */
56 #ifndef _POSIX_SOURCE
57 #define SIGTRAP 5 /* trace trap (not reset when caught) */
58 #endif
59 #define SIGABRT 6 /* abort() */
60 #ifndef _POSIX_SOURCE
61 #define SIGIOT SIGABRT /* compatibility */
62 #define SIGEMT 7 /* EMT instruction */
63 #endif
64 #define SIGFPE 8 /* floating point exception */
65 #define SIGKILL 9 /* kill (cannot be caught or ignored) */
66 #ifndef _POSIX_SOURCE
67 #define SIGBUS 10 /* bus error */
68 #endif
69 #define SIGSEGV 11 /* segmentation violation */
70 #ifndef _POSIX_SOURCE
71 #define SIGSYS 12 /* non-existent system call invoked */
72 #endif
73 #define SIGPIPE 13 /* write on a pipe with no one to read it */
74 #define SIGALRM 14 /* alarm clock */
75 #define SIGTERM 15 /* software termination signal from kill */
76 #ifndef _POSIX_SOURCE
77 #define SIGURG 16 /* urgent condition on IO channel */
78 #endif
79 #define SIGSTOP 17 /* sendable stop signal not from tty */
80 #define SIGTSTP 18 /* stop signal from tty */
81 #define SIGCONT 19 /* continue a stopped process */
82 #define SIGCHLD 20 /* to parent on child stop or exit */
83 #define SIGTTIN 21 /* to readers pgrp upon background tty read */
84 #define SIGTTOU 22 /* like TTIN for output if (tp->t_local<OSTOP) */
85 #ifndef _POSIX_SOURCE
86 #define SIGIO 23 /* input/output possible signal */
87 #define SIGXCPU 24 /* exceeded CPU time limit */
88 #define SIGXFSZ 25 /* exceeded file size limit */
89 #define SIGVTALRM 26 /* virtual time alarm */
90 #define SIGPROF 27 /* profiling time alarm */
91 #define SIGWINCH 28 /* window size changes */
92 #define SIGINFO 29 /* information request */
93 #endif
94 #define SIGUSR1 30 /* user defined signal 1 */
95 #define SIGUSR2 31 /* user defined signal 2 */
96
97 /*-
98 * Type of a signal handling function.
99 *
100 * Language spec sez signal handlers take exactly one arg, even though we
101 * actually supply three. Ugh!
102 *
103 * We don't try to hide the difference by leaving out the args because
104 * that would cause warnings about conformant programs. Nonconformant
105 * programs can avoid the warnings by casting to (__sighandler_t *) or
106 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
107 *
108 * The kernel should reverse the cast before calling the function. It
109 * has no way to do this, but on most machines 1-arg and 3-arg functions
110 * have the same calling protocol so there is no problem in practice.
111 * A bit in sa_flags could be used to specify the number of args.
112 */
113 typedef void __sighandler_t __P((int));
114
115 #define SIG_DFL ((__sighandler_t *)0)
116 #define SIG_IGN ((__sighandler_t *)1)
117 #define SIG_ERR ((__sighandler_t *)-1)
118
119 #ifndef _ANSI_SOURCE
120 typedef unsigned int sigset_t;
121
122 /*
123 * Signal vector "template" used in sigaction call.
124 */
125 struct sigaction {
126 __sighandler_t *sa_handler; /* signal handler */
127 sigset_t sa_mask; /* signal mask to apply */
128 int sa_flags; /* see signal options below */
129 };
130 #ifndef _POSIX_SOURCE
131 #define SA_ONSTACK 0x0001 /* take signal on signal stack */
132 #define SA_RESTART 0x0002 /* restart system call on signal return */
133 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
134 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
135 #ifdef COMPAT_SUNOS
136 #define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */
137 #endif
138 #endif /* _POSIX_SOURCE */
139 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
140
141 /*
142 * Flags for sigprocmask:
143 */
144 #define SIG_BLOCK 1 /* block specified signal set */
145 #define SIG_UNBLOCK 2 /* unblock specified signal set */
146 #define SIG_SETMASK 3 /* set specified signal set */
147
148 #ifndef _POSIX_SOURCE
149 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
150
151 /*
152 * Structure used in sigaltstack call.
153 */
154 struct sigaltstack {
155 char *ss_sp; /* signal stack base */
156 int ss_size; /* signal stack length */
157 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
158 };
159 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */
160 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
161 #define MINSIGSTKSZ 8192 /* minimum allowable stack */
162 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
163
164 /*
165 * 4.3 compatibility:
166 * Signal vector "template" used in sigvec call.
167 */
168 struct sigvec {
169 __sighandler_t *sv_handler; /* signal handler */
170 int sv_mask; /* signal mask to apply */
171 int sv_flags; /* see signal options below */
172 };
173
174 #define SV_ONSTACK SA_ONSTACK
175 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
176 #define SV_RESETHAND SA_RESETHAND
177 #define SV_NODEFER SA_NODEFER
178 #define SV_NOCLDSTOP SA_NOCLDSTOP
179 #define sv_onstack sv_flags /* isn't compatibility wonderful! */
180
181 /*
182 * Structure used in sigstack call.
183 */
184 struct sigstack {
185 char *ss_sp; /* signal stack pointer */
186 int ss_onstack; /* current status */
187 };
188
189 /*
190 * Macro for converting signal number to a mask suitable for
191 * sigblock().
192 */
193 #define sigmask(m) (1 << ((m)-1))
194
195 #define BADSIG SIG_ERR
196
197 #endif /* !_POSIX_SOURCE */
198 #endif /* !_ANSI_SOURCE */
199
200 /*
201 * For historical reasons; programs expect signal's return value to be
202 * defined by <sys/signal.h>.
203 */
204 __BEGIN_DECLS
205 __sighandler_t *signal __P((int, __sighandler_t *));
206 __END_DECLS
207
208 #endif /* !_SYS_SIGNAL_H_ */
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