1 /* $Id: signal.h,v 1.6 1999/08/18 23:37:49 ralf Exp $
2 *
3 * This file is subject to the terms and conditions of the GNU General Public
4 * License. See the file "COPYING" in the main directory of this archive
5 * for more details.
6 *
7 * Copyright (C) 1995, 1996, 1997, 1998, 1999 by Ralf Baechle
8 * Copyright (C) 1999 Silicon Graphics, Inc.
9 */
10 #ifndef _ASM_SIGNAL_H
11 #define _ASM_SIGNAL_H
12
13 #include <linux/types.h>
14
15 #define _NSIG 128
16 #define _NSIG_BPW 32
17 #define _NSIG_WORDS (_NSIG / _NSIG_BPW)
18
19 typedef struct {
20 unsigned long sig[_NSIG_WORDS];
21 } sigset_t;
22
23 typedef unsigned long old_sigset_t; /* at least 32 bits */
24
25 #define SIGHUP 1 /* Hangup (POSIX). */
26 #define SIGINT 2 /* Interrupt (ANSI). */
27 #define SIGQUIT 3 /* Quit (POSIX). */
28 #define SIGILL 4 /* Illegal instruction (ANSI). */
29 #define SIGTRAP 5 /* Trace trap (POSIX). */
30 #define SIGIOT 6 /* IOT trap (4.2 BSD). */
31 #define SIGABRT SIGIOT /* Abort (ANSI). */
32 #define SIGEMT 7
33 #define SIGFPE 8 /* Floating-point exception (ANSI). */
34 #define SIGKILL 9 /* Kill, unblockable (POSIX). */
35 #define SIGBUS 10 /* BUS error (4.2 BSD). */
36 #define SIGSEGV 11 /* Segmentation violation (ANSI). */
37 #define SIGSYS 12
38 #define SIGPIPE 13 /* Broken pipe (POSIX). */
39 #define SIGALRM 14 /* Alarm clock (POSIX). */
40 #define SIGTERM 15 /* Termination (ANSI). */
41 #define SIGUSR1 16 /* User-defined signal 1 (POSIX). */
42 #define SIGUSR2 17 /* User-defined signal 2 (POSIX). */
43 #define SIGCHLD 18 /* Child status has changed (POSIX). */
44 #define SIGCLD SIGCHLD /* Same as SIGCHLD (System V). */
45 #define SIGPWR 19 /* Power failure restart (System V). */
46 #define SIGWINCH 20 /* Window size change (4.3 BSD, Sun). */
47 #define SIGURG 21 /* Urgent condition on socket (4.2 BSD). */
48 #define SIGIO 22 /* I/O now possible (4.2 BSD). */
49 #define SIGPOLL SIGIO /* Pollable event occurred (System V). */
50 #define SIGSTOP 23 /* Stop, unblockable (POSIX). */
51 #define SIGTSTP 24 /* Keyboard stop (POSIX). */
52 #define SIGCONT 25 /* Continue (POSIX). */
53 #define SIGTTIN 26 /* Background read from tty (POSIX). */
54 #define SIGTTOU 27 /* Background write to tty (POSIX). */
55 #define SIGVTALRM 28 /* Virtual alarm clock (4.2 BSD). */
56 #define SIGPROF 29 /* Profiling alarm clock (4.2 BSD). */
57 #define SIGXCPU 30 /* CPU limit exceeded (4.2 BSD). */
58 #define SIGXFSZ 31 /* File size limit exceeded (4.2 BSD). */
59
60 /* These should not be considered constants from userland. */
61 #define SIGRTMIN 32
62 #define SIGRTMAX (_NSIG-1)
63
64 /*
65 * SA_FLAGS values:
66 *
67 * SA_ONSTACK indicates that a registered stack_t will be used.
68 * SA_INTERRUPT is a no-op, but left due to historical reasons. Use the
69 * SA_RESTART flag to get restarting signals (which were the default long ago)
70 * SA_NOCLDSTOP flag to turn off SIGCHLD when children stop.
71 * SA_RESETHAND clears the handler when the signal is delivered.
72 * SA_NOCLDWAIT flag on SIGCHLD to inhibit zombies.
73 * SA_NODEFER prevents the current signal from being masked in the handler.
74 *
75 * SA_ONESHOT and SA_NOMASK are the historical Linux names for the Single
76 * Unix names RESETHAND and NODEFER respectively.
77 */
78 #define SA_ONSTACK 0x08000000
79 #define SA_RESETHAND 0x80000000
80 #define SA_RESTART 0x10000000
81 #define SA_SIGINFO 0x00000008
82 #define SA_NODEFER 0x40000000
83 #define SA_NOCLDWAIT 0x00010000 /* Not supported yet */
84 #define SA_NOCLDSTOP 0x00000001
85
86 #define SA_NOMASK SA_NODEFER
87 #define SA_ONESHOT SA_RESETHAND
88 #define SA_INTERRUPT 0x20000000 /* dummy -- ignored */
89
90 #define SA_RESTORER 0x04000000
91
92 /*
93 * sigaltstack controls
94 */
95 #define SS_ONSTACK 1
96 #define SS_DISABLE 2
97
98 #define MINSIGSTKSZ 2048
99 #define SIGSTKSZ 8192
100
101 #ifdef __KERNEL__
102
103 /*
104 * These values of sa_flags are used only by the kernel as part of the
105 * irq handling routines.
106 *
107 * SA_INTERRUPT is also used by the irq handling routines.
108 * SA_SHIRQ flag is for shared interrupt support on PCI and EISA.
109 */
110 #define SA_PROBE SA_ONESHOT
111 #define SA_SAMPLE_RANDOM SA_RESTART
112 #define SA_SHIRQ 0x02000000
113
114 #endif /* __KERNEL__ */
115
116 #define SIG_BLOCK 1 /* for blocking signals */
117 #define SIG_UNBLOCK 2 /* for unblocking signals */
118 #define SIG_SETMASK 3 /* for setting the signal mask */
119 #define SIG_SETMASK32 256 /* Goodie from SGI for BSD compatibility:
120 set only the low 32 bit of the sigset. */
121
122 /* Type of a signal handler. */
123 typedef void (*__sighandler_t)(int);
124
125 /* Fake signal functions */
126 #define SIG_DFL ((__sighandler_t)0) /* default signal handling */
127 #define SIG_IGN ((__sighandler_t)1) /* ignore signal */
128 #define SIG_ERR ((__sighandler_t)-1) /* error return from signal */
129
130 struct sigaction {
131 unsigned int sa_flags;
132 __sighandler_t sa_handler;
133 sigset_t sa_mask;
134 void (*sa_restorer)(void);
135 int sa_resv[1]; /* reserved */
136 };
137
138 struct k_sigaction {
139 struct sigaction sa;
140 };
141
142 /* IRIX compatible stack_t */
143 typedef struct sigaltstack {
144 void *ss_sp;
145 size_t ss_size;
146 int ss_flags;
147 } stack_t;
148
149 #ifdef __KERNEL__
150 #include <asm/sigcontext.h>
151
152 /*
153 * The following break codes are or were in use for specific purposes in
154 * other MIPS operating systems. Linux/MIPS doesn't use all of them. The
155 * unused ones are here as placeholders; we might encounter them in
156 * non-Linux/MIPS object files or make use of them in the future.
157 */
158 #define BRK_USERBP 0 /* User bp (used by debuggers) */
159 #define BRK_KERNELBP 1 /* Break in the kernel */
160 #define BRK_ABORT 2 /* Sometimes used by abort(3) to SIGIOT */
161 #define BRK_BD_TAKEN 3 /* For bd slot emulation - not implemented */
162 #define BRK_BD_NOTTAKEN 4 /* For bd slot emulation - not implemented */
163 #define BRK_SSTEPBP 5 /* User bp (used by debuggers) */
164 #define BRK_OVERFLOW 6 /* Overflow check */
165 #define BRK_DIVZERO 7 /* Divide by zero check */
166 #define BRK_RANGE 8 /* Range error check */
167 #define BRK_STACKOVERFLOW 9 /* For Ada stackchecking */
168 #define BRK_NORLD 10 /* No rld found - not used by Linux/MIPS */
169 #define _BRK_THREADBP 11 /* For threads, user bp (used by debuggers) */
170 #define BRK_MULOVF 1023 /* Multiply overflow */
171
172 #endif /* defined (__KERNEL__) */
173
174 #endif /* _ASM_SIGNAL_H */
175
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