signal.h 5.4 KB

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  1. #ifndef _LINUX_SIGNAL_H
  2. #define _LINUX_SIGNAL_H
  3. #include <asm/signal.h>
  4. #include <asm/siginfo.h>
  5. #ifdef __KERNEL__
  6. #include <linux/list.h>
  7. #include <linux/spinlock.h>
  8. /*
  9. * Real Time signals may be queued.
  10. */
  11. struct sigqueue {
  12. struct list_head list;
  13. int flags;
  14. siginfo_t info;
  15. struct user_struct *user;
  16. };
  17. /* flags values. */
  18. #define SIGQUEUE_PREALLOC 1
  19. struct sigpending {
  20. struct list_head list;
  21. sigset_t signal;
  22. };
  23. /*
  24. * Define some primitives to manipulate sigset_t.
  25. */
  26. #ifndef __HAVE_ARCH_SIG_BITOPS
  27. #include <linux/bitops.h>
  28. /* We don't use <linux/bitops.h> for these because there is no need to
  29. be atomic. */
  30. static inline void sigaddset(sigset_t *set, int _sig)
  31. {
  32. unsigned long sig = _sig - 1;
  33. if (_NSIG_WORDS == 1)
  34. set->sig[0] |= 1UL << sig;
  35. else
  36. set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);
  37. }
  38. static inline void sigdelset(sigset_t *set, int _sig)
  39. {
  40. unsigned long sig = _sig - 1;
  41. if (_NSIG_WORDS == 1)
  42. set->sig[0] &= ~(1UL << sig);
  43. else
  44. set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
  45. }
  46. static inline int sigismember(sigset_t *set, int _sig)
  47. {
  48. unsigned long sig = _sig - 1;
  49. if (_NSIG_WORDS == 1)
  50. return 1 & (set->sig[0] >> sig);
  51. else
  52. return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
  53. }
  54. static inline int sigfindinword(unsigned long word)
  55. {
  56. return ffz(~word);
  57. }
  58. #endif /* __HAVE_ARCH_SIG_BITOPS */
  59. static inline int sigisemptyset(sigset_t *set)
  60. {
  61. extern void _NSIG_WORDS_is_unsupported_size(void);
  62. switch (_NSIG_WORDS) {
  63. case 4:
  64. return (set->sig[3] | set->sig[2] |
  65. set->sig[1] | set->sig[0]) == 0;
  66. case 2:
  67. return (set->sig[1] | set->sig[0]) == 0;
  68. case 1:
  69. return set->sig[0] == 0;
  70. default:
  71. _NSIG_WORDS_is_unsupported_size();
  72. return 0;
  73. }
  74. }
  75. #define sigmask(sig) (1UL << ((sig) - 1))
  76. #ifndef __HAVE_ARCH_SIG_SETOPS
  77. #include <linux/string.h>
  78. #define _SIG_SET_BINOP(name, op) \
  79. static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
  80. { \
  81. extern void _NSIG_WORDS_is_unsupported_size(void); \
  82. unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
  83. \
  84. switch (_NSIG_WORDS) { \
  85. case 4: \
  86. a3 = a->sig[3]; a2 = a->sig[2]; \
  87. b3 = b->sig[3]; b2 = b->sig[2]; \
  88. r->sig[3] = op(a3, b3); \
  89. r->sig[2] = op(a2, b2); \
  90. case 2: \
  91. a1 = a->sig[1]; b1 = b->sig[1]; \
  92. r->sig[1] = op(a1, b1); \
  93. case 1: \
  94. a0 = a->sig[0]; b0 = b->sig[0]; \
  95. r->sig[0] = op(a0, b0); \
  96. break; \
  97. default: \
  98. _NSIG_WORDS_is_unsupported_size(); \
  99. } \
  100. }
  101. #define _sig_or(x,y) ((x) | (y))
  102. _SIG_SET_BINOP(sigorsets, _sig_or)
  103. #define _sig_and(x,y) ((x) & (y))
  104. _SIG_SET_BINOP(sigandsets, _sig_and)
  105. #define _sig_nand(x,y) ((x) & ~(y))
  106. _SIG_SET_BINOP(signandsets, _sig_nand)
  107. #undef _SIG_SET_BINOP
  108. #undef _sig_or
  109. #undef _sig_and
  110. #undef _sig_nand
  111. #define _SIG_SET_OP(name, op) \
  112. static inline void name(sigset_t *set) \
  113. { \
  114. extern void _NSIG_WORDS_is_unsupported_size(void); \
  115. \
  116. switch (_NSIG_WORDS) { \
  117. case 4: set->sig[3] = op(set->sig[3]); \
  118. set->sig[2] = op(set->sig[2]); \
  119. case 2: set->sig[1] = op(set->sig[1]); \
  120. case 1: set->sig[0] = op(set->sig[0]); \
  121. break; \
  122. default: \
  123. _NSIG_WORDS_is_unsupported_size(); \
  124. } \
  125. }
  126. #define _sig_not(x) (~(x))
  127. _SIG_SET_OP(signotset, _sig_not)
  128. #undef _SIG_SET_OP
  129. #undef _sig_not
  130. static inline void sigemptyset(sigset_t *set)
  131. {
  132. switch (_NSIG_WORDS) {
  133. default:
  134. memset(set, 0, sizeof(sigset_t));
  135. break;
  136. case 2: set->sig[1] = 0;
  137. case 1: set->sig[0] = 0;
  138. break;
  139. }
  140. }
  141. static inline void sigfillset(sigset_t *set)
  142. {
  143. switch (_NSIG_WORDS) {
  144. default:
  145. memset(set, -1, sizeof(sigset_t));
  146. break;
  147. case 2: set->sig[1] = -1;
  148. case 1: set->sig[0] = -1;
  149. break;
  150. }
  151. }
  152. /* Some extensions for manipulating the low 32 signals in particular. */
  153. static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
  154. {
  155. set->sig[0] |= mask;
  156. }
  157. static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
  158. {
  159. set->sig[0] &= ~mask;
  160. }
  161. static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
  162. {
  163. return (set->sig[0] & mask) != 0;
  164. }
  165. static inline void siginitset(sigset_t *set, unsigned long mask)
  166. {
  167. set->sig[0] = mask;
  168. switch (_NSIG_WORDS) {
  169. default:
  170. memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
  171. break;
  172. case 2: set->sig[1] = 0;
  173. case 1: ;
  174. }
  175. }
  176. static inline void siginitsetinv(sigset_t *set, unsigned long mask)
  177. {
  178. set->sig[0] = ~mask;
  179. switch (_NSIG_WORDS) {
  180. default:
  181. memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
  182. break;
  183. case 2: set->sig[1] = -1;
  184. case 1: ;
  185. }
  186. }
  187. #endif /* __HAVE_ARCH_SIG_SETOPS */
  188. static inline void init_sigpending(struct sigpending *sig)
  189. {
  190. sigemptyset(&sig->signal);
  191. INIT_LIST_HEAD(&sig->list);
  192. }
  193. extern void flush_sigqueue(struct sigpending *queue);
  194. /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
  195. static inline int valid_signal(unsigned long sig)
  196. {
  197. return sig <= _NSIG ? 1 : 0;
  198. }
  199. extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
  200. extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
  201. extern long do_sigpending(void __user *, unsigned long);
  202. extern int sigprocmask(int, sigset_t *, sigset_t *);
  203. struct pt_regs;
  204. extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
  205. extern struct kmem_cache *sighand_cachep;
  206. #endif /* __KERNEL__ */
  207. #endif /* _LINUX_SIGNAL_H */