Don't include linux/config.h from anywhere else in include/
[linux-2.6.git] / include / linux / signal.h
1 #ifndef _LINUX_SIGNAL_H
2 #define _LINUX_SIGNAL_H
3
4 #include <asm/signal.h>
5 #include <asm/siginfo.h>
6
7 #ifdef __KERNEL__
8 #include <linux/list.h>
9 #include <linux/spinlock.h>
10
11 /*
12  * These values of sa_flags are used only by the kernel as part of the
13  * irq handling routines.
14  *
15  * SA_INTERRUPT is also used by the irq handling routines.
16  * SA_SHIRQ is for shared interrupt support on PCI and EISA.
17  */
18 #define SA_PROBE                SA_ONESHOT
19 #define SA_SAMPLE_RANDOM        SA_RESTART
20 #define SA_SHIRQ                0x04000000
21 /*
22  * As above, these correspond to the IORESOURCE_IRQ_* defines in
23  * linux/ioport.h to select the interrupt line behaviour.  When
24  * requesting an interrupt without specifying a SA_TRIGGER, the
25  * setting should be assumed to be "as already configured", which
26  * may be as per machine or firmware initialisation.
27  */
28 #define SA_TRIGGER_LOW          0x00000008
29 #define SA_TRIGGER_HIGH         0x00000004
30 #define SA_TRIGGER_FALLING      0x00000002
31 #define SA_TRIGGER_RISING       0x00000001
32 #define SA_TRIGGER_MASK (SA_TRIGGER_HIGH|SA_TRIGGER_LOW|\
33                                  SA_TRIGGER_RISING|SA_TRIGGER_FALLING)
34
35 /*
36  * Real Time signals may be queued.
37  */
38
39 struct sigqueue {
40         struct list_head list;
41         int flags;
42         siginfo_t info;
43         struct user_struct *user;
44 };
45
46 /* flags values. */
47 #define SIGQUEUE_PREALLOC       1
48
49 struct sigpending {
50         struct list_head list;
51         sigset_t signal;
52 };
53
54 /*
55  * Define some primitives to manipulate sigset_t.
56  */
57
58 #ifndef __HAVE_ARCH_SIG_BITOPS
59 #include <linux/bitops.h>
60
61 /* We don't use <linux/bitops.h> for these because there is no need to
62    be atomic.  */
63 static inline void sigaddset(sigset_t *set, int _sig)
64 {
65         unsigned long sig = _sig - 1;
66         if (_NSIG_WORDS == 1)
67                 set->sig[0] |= 1UL << sig;
68         else
69                 set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);
70 }
71
72 static inline void sigdelset(sigset_t *set, int _sig)
73 {
74         unsigned long sig = _sig - 1;
75         if (_NSIG_WORDS == 1)
76                 set->sig[0] &= ~(1UL << sig);
77         else
78                 set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
79 }
80
81 static inline int sigismember(sigset_t *set, int _sig)
82 {
83         unsigned long sig = _sig - 1;
84         if (_NSIG_WORDS == 1)
85                 return 1 & (set->sig[0] >> sig);
86         else
87                 return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
88 }
89
90 static inline int sigfindinword(unsigned long word)
91 {
92         return ffz(~word);
93 }
94
95 #endif /* __HAVE_ARCH_SIG_BITOPS */
96
97 static inline int sigisemptyset(sigset_t *set)
98 {
99         extern void _NSIG_WORDS_is_unsupported_size(void);
100         switch (_NSIG_WORDS) {
101         case 4:
102                 return (set->sig[3] | set->sig[2] |
103                         set->sig[1] | set->sig[0]) == 0;
104         case 2:
105                 return (set->sig[1] | set->sig[0]) == 0;
106         case 1:
107                 return set->sig[0] == 0;
108         default:
109                 _NSIG_WORDS_is_unsupported_size();
110                 return 0;
111         }
112 }
113
114 #define sigmask(sig)    (1UL << ((sig) - 1))
115
116 #ifndef __HAVE_ARCH_SIG_SETOPS
117 #include <linux/string.h>
118
119 #define _SIG_SET_BINOP(name, op)                                        \
120 static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
121 {                                                                       \
122         extern void _NSIG_WORDS_is_unsupported_size(void);              \
123         unsigned long a0, a1, a2, a3, b0, b1, b2, b3;                   \
124                                                                         \
125         switch (_NSIG_WORDS) {                                          \
126             case 4:                                                     \
127                 a3 = a->sig[3]; a2 = a->sig[2];                         \
128                 b3 = b->sig[3]; b2 = b->sig[2];                         \
129                 r->sig[3] = op(a3, b3);                                 \
130                 r->sig[2] = op(a2, b2);                                 \
131             case 2:                                                     \
132                 a1 = a->sig[1]; b1 = b->sig[1];                         \
133                 r->sig[1] = op(a1, b1);                                 \
134             case 1:                                                     \
135                 a0 = a->sig[0]; b0 = b->sig[0];                         \
136                 r->sig[0] = op(a0, b0);                                 \
137                 break;                                                  \
138             default:                                                    \
139                 _NSIG_WORDS_is_unsupported_size();                      \
140         }                                                               \
141 }
142
143 #define _sig_or(x,y)    ((x) | (y))
144 _SIG_SET_BINOP(sigorsets, _sig_or)
145
146 #define _sig_and(x,y)   ((x) & (y))
147 _SIG_SET_BINOP(sigandsets, _sig_and)
148
149 #define _sig_nand(x,y)  ((x) & ~(y))
150 _SIG_SET_BINOP(signandsets, _sig_nand)
151
152 #undef _SIG_SET_BINOP
153 #undef _sig_or
154 #undef _sig_and
155 #undef _sig_nand
156
157 #define _SIG_SET_OP(name, op)                                           \
158 static inline void name(sigset_t *set)                                  \
159 {                                                                       \
160         extern void _NSIG_WORDS_is_unsupported_size(void);              \
161                                                                         \
162         switch (_NSIG_WORDS) {                                          \
163             case 4: set->sig[3] = op(set->sig[3]);                      \
164                     set->sig[2] = op(set->sig[2]);                      \
165             case 2: set->sig[1] = op(set->sig[1]);                      \
166             case 1: set->sig[0] = op(set->sig[0]);                      \
167                     break;                                              \
168             default:                                                    \
169                 _NSIG_WORDS_is_unsupported_size();                      \
170         }                                                               \
171 }
172
173 #define _sig_not(x)     (~(x))
174 _SIG_SET_OP(signotset, _sig_not)
175
176 #undef _SIG_SET_OP
177 #undef _sig_not
178
179 static inline void sigemptyset(sigset_t *set)
180 {
181         switch (_NSIG_WORDS) {
182         default:
183                 memset(set, 0, sizeof(sigset_t));
184                 break;
185         case 2: set->sig[1] = 0;
186         case 1: set->sig[0] = 0;
187                 break;
188         }
189 }
190
191 static inline void sigfillset(sigset_t *set)
192 {
193         switch (_NSIG_WORDS) {
194         default:
195                 memset(set, -1, sizeof(sigset_t));
196                 break;
197         case 2: set->sig[1] = -1;
198         case 1: set->sig[0] = -1;
199                 break;
200         }
201 }
202
203 /* Some extensions for manipulating the low 32 signals in particular.  */
204
205 static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
206 {
207         set->sig[0] |= mask;
208 }
209
210 static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
211 {
212         set->sig[0] &= ~mask;
213 }
214
215 static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
216 {
217         return (set->sig[0] & mask) != 0;
218 }
219
220 static inline void siginitset(sigset_t *set, unsigned long mask)
221 {
222         set->sig[0] = mask;
223         switch (_NSIG_WORDS) {
224         default:
225                 memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
226                 break;
227         case 2: set->sig[1] = 0;
228         case 1: ;
229         }
230 }
231
232 static inline void siginitsetinv(sigset_t *set, unsigned long mask)
233 {
234         set->sig[0] = ~mask;
235         switch (_NSIG_WORDS) {
236         default:
237                 memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
238                 break;
239         case 2: set->sig[1] = -1;
240         case 1: ;
241         }
242 }
243
244 #endif /* __HAVE_ARCH_SIG_SETOPS */
245
246 static inline void init_sigpending(struct sigpending *sig)
247 {
248         sigemptyset(&sig->signal);
249         INIT_LIST_HEAD(&sig->list);
250 }
251
252 extern void flush_sigqueue(struct sigpending *queue);
253
254 /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
255 static inline int valid_signal(unsigned long sig)
256 {
257         return sig <= _NSIG ? 1 : 0;
258 }
259
260 extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
261 extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
262 extern long do_sigpending(void __user *, unsigned long);
263 extern int sigprocmask(int, sigset_t *, sigset_t *);
264
265 struct pt_regs;
266 extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
267
268 #endif /* __KERNEL__ */
269
270 #endif /* _LINUX_SIGNAL_H */