FreeBSD/Linux Kernel Cross Reference
sys/sys/signalvar.h
1 /*
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)signalvar.h 8.6 (Berkeley) 2/19/95
34 * $FreeBSD$
35 */
36
37 #ifndef _SYS_SIGNALVAR_H_ /* tmp for user.h */
38 #define _SYS_SIGNALVAR_H_
39
40 #include <sys/signal.h>
41
42 /*
43 * Kernel signal definitions and data structures,
44 * not exported to user programs.
45 */
46
47 /*
48 * Process signal actions and state, needed only within the process
49 * (not necessarily resident).
50 */
51 struct sigacts {
52 sig_t ps_sigact[NSIG]; /* disposition of signals */
53 sigset_t ps_catchmask[NSIG]; /* signals to be blocked */
54 sigset_t ps_sigonstack; /* signals to take on sigstack */
55 sigset_t ps_sigintr; /* signals that interrupt syscalls */
56 sigset_t ps_sigreset; /* signals that reset when caught */
57 sigset_t ps_signodefer; /* signals not masked while handled */
58 int ps_flags; /* signal flags, below */
59 struct sigaltstack ps_sigstk; /* sp & on stack state variable */
60 sigset_t ps_usertramp; /* SunOS compat; libc sigtramp XXX */
61 };
62
63 /* signal flags */
64 #define SAS_OLDMASK 0x01 /* need to restore mask before pause */
65 #define SAS_ALTSTACK 0x02 /* have alternate signal stack */
66
67 /* additional signal action values, used only temporarily/internally */
68 #define SIG_CATCH ((__sighandler_t *)2)
69 #define SIG_HOLD ((__sighandler_t *)3)
70
71 /*
72 * get signal action for process and signal; currently only for current process
73 */
74 #define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[(sig)])
75
76 /*
77 * Determine signal that should be delivered to process p, the current
78 * process, 0 if none. If there is a pending stop signal with default
79 * action, the process stops in issignal().
80 */
81 #define CURSIG(p) \
82 (((p)->p_siglist == 0 || \
83 (((p)->p_flag & P_TRACED) == 0 && \
84 ((p)->p_siglist & ~(p)->p_sigmask) == 0)) ? \
85 0 : issignal(p))
86
87 /*
88 * Clear a pending signal from a process.
89 */
90 #define CLRSIG(p, sig) { (p)->p_siglist &= ~sigmask(sig); }
91
92 /*
93 * Signal properties and actions.
94 * The array below categorizes the signals and their default actions
95 * according to the following properties:
96 */
97 #define SA_KILL 0x01 /* terminates process by default */
98 #define SA_CORE 0x02 /* ditto and coredumps */
99 #define SA_STOP 0x04 /* suspend process */
100 #define SA_TTYSTOP 0x08 /* ditto, from tty */
101 #define SA_IGNORE 0x10 /* ignore by default */
102 #define SA_CONT 0x20 /* continue if suspended */
103 #define SA_CANTMASK 0x40 /* non-maskable, catchable */
104
105 #ifdef SIGPROP
106 static int sigprop[NSIG + 1] = {
107 0, /* unused */
108 SA_KILL, /* SIGHUP */
109 SA_KILL, /* SIGINT */
110 SA_KILL|SA_CORE, /* SIGQUIT */
111 SA_KILL|SA_CORE, /* SIGILL */
112 SA_KILL|SA_CORE, /* SIGTRAP */
113 SA_KILL|SA_CORE, /* SIGABRT */
114 SA_KILL|SA_CORE, /* SIGEMT */
115 SA_KILL|SA_CORE, /* SIGFPE */
116 SA_KILL, /* SIGKILL */
117 SA_KILL|SA_CORE, /* SIGBUS */
118 SA_KILL|SA_CORE, /* SIGSEGV */
119 SA_KILL|SA_CORE, /* SIGSYS */
120 SA_KILL, /* SIGPIPE */
121 SA_KILL, /* SIGALRM */
122 SA_KILL, /* SIGTERM */
123 SA_IGNORE, /* SIGURG */
124 SA_STOP, /* SIGSTOP */
125 SA_STOP|SA_TTYSTOP, /* SIGTSTP */
126 SA_IGNORE|SA_CONT, /* SIGCONT */
127 SA_IGNORE, /* SIGCHLD */
128 SA_STOP|SA_TTYSTOP, /* SIGTTIN */
129 SA_STOP|SA_TTYSTOP, /* SIGTTOU */
130 SA_IGNORE, /* SIGIO */
131 SA_KILL, /* SIGXCPU */
132 SA_KILL, /* SIGXFSZ */
133 SA_KILL, /* SIGVTALRM */
134 SA_KILL, /* SIGPROF */
135 SA_IGNORE, /* SIGWINCH */
136 SA_IGNORE, /* SIGINFO */
137 SA_KILL, /* SIGUSR1 */
138 SA_KILL, /* SIGUSR2 */
139 };
140
141 #define contsigmask (sigmask(SIGCONT))
142 #define stopsigmask (sigmask(SIGSTOP) | sigmask(SIGTSTP) | \
143 sigmask(SIGTTIN) | sigmask(SIGTTOU))
144
145 #endif /* SIGPROP */
146
147 #define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP))
148
149 #ifdef KERNEL
150 struct pgrp;
151 struct proc;
152 struct sigio;
153
154 extern int sugid_coredump; /* Sysctl variable kern.sugid_coredump */
155
156 /*
157 * Machine-independent functions:
158 */
159 void execsigs __P((struct proc *p));
160 void gsignal __P((int pgid, int sig));
161 int issignal __P((struct proc *p));
162 void killproc __P((struct proc *p, char *why));
163 void pgsigio __P((struct sigio *, int signum, int checkctty));
164 void pgsignal __P((struct pgrp *pgrp, int sig, int checkctty));
165 void postsig __P((int sig));
166 void psignal __P((struct proc *p, int sig));
167 void sigexit __P((struct proc *p, int signum));
168 void siginit __P((struct proc *p));
169 void trapsignal __P((struct proc *p, int sig, u_long code));
170 void check_sigacts (void);
171 /*
172 * Machine-dependent functions:
173 */
174 void sendsig __P((sig_t action, int sig, int returnmask, u_long code));
175 #endif /* KERNEL */
176 #endif /* !_SYS_SIGNALVAR_H_ */
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