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Linux/include/asm-i386/signal.h

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  1 #ifndef _ASMi386_SIGNAL_H
  2 #define _ASMi386_SIGNAL_H
  3 
  4 #include <linux/types.h>
  5 
  6 /* Avoid too many header ordering problems.  */
  7 struct siginfo;
  8 
  9 #ifdef __KERNEL__
 10 /* Most things should be clean enough to redefine this at will, if care
 11    is taken to make libc match.  */
 12 
 13 #define _NSIG           64
 14 #define _NSIG_BPW       32
 15 #define _NSIG_WORDS     (_NSIG / _NSIG_BPW)
 16 
 17 typedef unsigned long old_sigset_t;             /* at least 32 bits */
 18 
 19 typedef struct {
 20         unsigned long sig[_NSIG_WORDS];
 21 } sigset_t;
 22 
 23 #else
 24 /* Here we must cater to libcs that poke about in kernel headers.  */
 25 
 26 #define NSIG            32
 27 typedef unsigned long sigset_t;
 28 
 29 #endif /* __KERNEL__ */
 30 
 31 #define SIGHUP           1
 32 #define SIGINT           2
 33 #define SIGQUIT          3
 34 #define SIGILL           4
 35 #define SIGTRAP          5
 36 #define SIGABRT          6
 37 #define SIGIOT           6
 38 #define SIGBUS           7
 39 #define SIGFPE           8
 40 #define SIGKILL          9
 41 #define SIGUSR1         10
 42 #define SIGSEGV         11
 43 #define SIGUSR2         12
 44 #define SIGPIPE         13
 45 #define SIGALRM         14
 46 #define SIGTERM         15
 47 #define SIGSTKFLT       16
 48 #define SIGCHLD         17
 49 #define SIGCONT         18
 50 #define SIGSTOP         19
 51 #define SIGTSTP         20
 52 #define SIGTTIN         21
 53 #define SIGTTOU         22
 54 #define SIGURG          23
 55 #define SIGXCPU         24
 56 #define SIGXFSZ         25
 57 #define SIGVTALRM       26
 58 #define SIGPROF         27
 59 #define SIGWINCH        28
 60 #define SIGIO           29
 61 #define SIGPOLL         SIGIO
 62 /*
 63 #define SIGLOST         29
 64 */
 65 #define SIGPWR          30
 66 #define SIGSYS          31
 67 #define SIGUNUSED       31
 68 
 69 /* These should not be considered constants from userland.  */
 70 #define SIGRTMIN        32
 71 #define SIGRTMAX        (_NSIG-1)
 72 
 73 /*
 74  * SA_FLAGS values:
 75  *
 76  * SA_ONSTACK indicates that a registered stack_t will be used.
 77  * SA_INTERRUPT is a no-op, but left due to historical reasons. Use the
 78  * SA_RESTART flag to get restarting signals (which were the default long ago)
 79  * SA_NOCLDSTOP flag to turn off SIGCHLD when children stop.
 80  * SA_RESETHAND clears the handler when the signal is delivered.
 81  * SA_NOCLDWAIT flag on SIGCHLD to inhibit zombies.
 82  * SA_NODEFER prevents the current signal from being masked in the handler.
 83  *
 84  * SA_ONESHOT and SA_NOMASK are the historical Linux names for the Single
 85  * Unix names RESETHAND and NODEFER respectively.
 86  */
 87 #define SA_NOCLDSTOP    0x00000001
 88 #define SA_NOCLDWAIT    0x00000002 /* not supported yet */
 89 #define SA_SIGINFO      0x00000004
 90 #define SA_ONSTACK      0x08000000
 91 #define SA_RESTART      0x10000000
 92 #define SA_NODEFER      0x40000000
 93 #define SA_RESETHAND    0x80000000
 94 
 95 #define SA_NOMASK       SA_NODEFER
 96 #define SA_ONESHOT      SA_RESETHAND
 97 #define SA_INTERRUPT    0x20000000 /* dummy -- ignored */
 98 
 99 #define SA_RESTORER     0x04000000
100 
101 /* 
102  * sigaltstack controls
103  */
104 #define SS_ONSTACK      1
105 #define SS_DISABLE      2
106 
107 #define MINSIGSTKSZ     2048
108 #define SIGSTKSZ        8192
109 
110 #ifdef __KERNEL__
111 
112 /*
113  * These values of sa_flags are used only by the kernel as part of the
114  * irq handling routines.
115  *
116  * SA_INTERRUPT is also used by the irq handling routines.
117  * SA_SHIRQ is for shared interrupt support on PCI and EISA.
118  */
119 #define SA_PROBE                SA_ONESHOT
120 #define SA_SAMPLE_RANDOM        SA_RESTART
121 #define SA_SHIRQ                0x04000000
122 #endif
123 
124 #define SIG_BLOCK          0    /* for blocking signals */
125 #define SIG_UNBLOCK        1    /* for unblocking signals */
126 #define SIG_SETMASK        2    /* for setting the signal mask */
127 
128 /* Type of a signal handler.  */
129 typedef void (*__sighandler_t)(int);
130 
131 #define SIG_DFL ((__sighandler_t)0)     /* default signal handling */
132 #define SIG_IGN ((__sighandler_t)1)     /* ignore signal */
133 #define SIG_ERR ((__sighandler_t)-1)    /* error return from signal */
134 
135 #ifdef __KERNEL__
136 struct old_sigaction {
137         __sighandler_t sa_handler;
138         old_sigset_t sa_mask;
139         unsigned long sa_flags;
140         void (*sa_restorer)(void);
141 };
142 
143 struct sigaction {
144         __sighandler_t sa_handler;
145         unsigned long sa_flags;
146         void (*sa_restorer)(void);
147         sigset_t sa_mask;               /* mask last for extensibility */
148 };
149 
150 struct k_sigaction {
151         struct sigaction sa;
152 };
153 #else
154 /* Here we must cater to libcs that poke about in kernel headers.  */
155 
156 struct sigaction {
157         union {
158           __sighandler_t _sa_handler;
159           void (*_sa_sigaction)(int, struct siginfo *, void *);
160         } _u;
161         sigset_t sa_mask;
162         unsigned long sa_flags;
163         void (*sa_restorer)(void);
164 };
165 
166 #define sa_handler      _u._sa_handler
167 #define sa_sigaction    _u._sa_sigaction
168 
169 #endif /* __KERNEL__ */
170 
171 typedef struct sigaltstack {
172         void *ss_sp;
173         int ss_flags;
174         size_t ss_size;
175 } stack_t;
176 
177 #ifdef __KERNEL__
178 #include <asm/sigcontext.h>
179 
180 #define __HAVE_ARCH_SIG_BITOPS
181 
182 static __inline__ void sigaddset(sigset_t *set, int _sig)
183 {
184         __asm__("btsl %1,%0" : "=m"(*set) : "Ir"(_sig - 1) : "cc");
185 }
186 
187 static __inline__ void sigdelset(sigset_t *set, int _sig)
188 {
189         __asm__("btrl %1,%0" : "=m"(*set) : "Ir"(_sig - 1) : "cc");
190 }
191 
192 static __inline__ int __const_sigismember(sigset_t *set, int _sig)
193 {
194         unsigned long sig = _sig - 1;
195         return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
196 }
197 
198 static __inline__ int __gen_sigismember(sigset_t *set, int _sig)
199 {
200         int ret;
201         __asm__("btl %2,%1\n\tsbbl %0,%0"
202                 : "=r"(ret) : "m"(*set), "Ir"(_sig-1) : "cc");
203         return ret;
204 }
205 
206 #define sigismember(set,sig)                    \
207         (__builtin_constant_p(sig) ?            \
208          __const_sigismember((set),(sig)) :     \
209          __gen_sigismember((set),(sig)))
210 
211 #define sigmask(sig)    (1UL << ((sig) - 1))
212 
213 static __inline__ int sigfindinword(unsigned long word)
214 {
215         __asm__("bsfl %1,%0" : "=r"(word) : "rm"(word) : "cc");
216         return word;
217 }
218 
219 #endif /* __KERNEL__ */
220 
221 #endif
222 

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