Green shading in the line number column means the source is part of the translation unit, red means it is conditionally excluded. Highlighted line numbers link to the translation unit page. Highlighted macros link to the macro page.
1: #ifndef _LINUX_SIGNAL_H 2: #define _LINUX_SIGNAL_H 3: 4: #include <linux/list.h> 5: #include <uapi/linux/signal.h> 6: 7: struct task_struct; 8: 9: /* for sysctl */ 10: extern int print_fatal_signals; 11: /* 12: * Real Time signals may be queued. 13: */ 14: 15: struct sigqueue { 16: struct list_head list; 17: int flags; 18: siginfo_t info; 19: struct user_struct *user; 20: }; 21: 22: /* flags values. */ 23: #define SIGQUEUE_PREALLOC 1 24: 25: struct sigpending { 26: struct list_head list; 27: sigset_t signal; 28: }; 29: 30: /* 31: * Define some primitives to manipulate sigset_t. 32: */ 33: 34: #ifndef __HAVE_ARCH_SIG_BITOPS 35: #include <linux/bitops.h> 36: 37: /* We don't use <linux/bitops.h> for these because there is no need to 38: be atomic. */ 39: static inline void sigaddset(sigset_t *set, int _sig) 40: { 41: unsigned long sig = _sig - 1; 42: if (_NSIG_WORDS == 1) 43: set->sig[0] |= 1UL << sig; 44: else 45: set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW); 46: } 47: 48: static inline void sigdelset(sigset_t *set, int _sig) 49: { 50: unsigned long sig = _sig - 1; 51: if (_NSIG_WORDS == 1) 52: set->sig[0] &= ~(1UL << sig); 53: else 54: set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW)); 55: } 56: 57: static inline int sigismember(sigset_t *set, int _sig) 58: { 59: unsigned long sig = _sig - 1; 60: if (_NSIG_WORDS == 1) 61: return 1 & (set->sig[0] >> sig); 62: else 63: return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW)); 64: } 65: 66: static inline int sigfindinword(unsigned long word) 67: { 68: return ffz(~word); 69: } 70: 71: #endif /* __HAVE_ARCH_SIG_BITOPS */ 72: 73: static inline int sigisemptyset(sigset_t *set) 74: { 75: extern void _NSIG_WORDS_is_unsupported_size(void); 76: switch (_NSIG_WORDS) { 77: case 4: 78: return (set->sig[3] | set->sig[2] | 79: set->sig[1] | set->sig[0]) == 0; 80: case 2: 81: return (set->sig[1] | set->sig[0]) == 0; 82: case 1: 83: return set->sig[0] == 0; 84: default: 85: _NSIG_WORDS_is_unsupported_size(); 86: return 0; 87: } 88: } 89: 90: #define sigmask(sig) (1UL << ((sig) - 1)) 91: 92: #ifndef __HAVE_ARCH_SIG_SETOPS 93: #include <linux/string.h> 94: 95: #define _SIG_SET_BINOP(name, op) \ 96: static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \ 97: { \ 98: extern void _NSIG_WORDS_is_unsupported_size(void); \ 99: unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \ 100: \ 101: switch (_NSIG_WORDS) { \ 102: case 4: \ 103: a3 = a->sig[3]; a2 = a->sig[2]; \ 104: b3 = b->sig[3]; b2 = b->sig[2]; \ 105: r->sig[3] = op(a3, b3); \ 106: r->sig[2] = op(a2, b2); \ 107: case 2: \ 108: a1 = a->sig[1]; b1 = b->sig[1]; \ 109: r->sig[1] = op(a1, b1); \ 110: case 1: \ 111: a0 = a->sig[0]; b0 = b->sig[0]; \ 112: r->sig[0] = op(a0, b0); \ 113: break; \ 114: default: \ 115: _NSIG_WORDS_is_unsupported_size(); \ 116: } \ 117: } 118: 119: #define _sig_or(x,y) ((x) | (y)) 120: _SIG_SET_BINOP(sigorsets, _sig_or) 121: 122: #define _sig_and(x,y) ((x) & (y)) 123: _SIG_SET_BINOP(sigandsets, _sig_and) 124: 125: #define _sig_andn(x,y) ((x) & ~(y)) 126: _SIG_SET_BINOP(sigandnsets, _sig_andn) 127: 128: #undef _SIG_SET_BINOP 129: #undef _sig_or 130: #undef _sig_and 131: #undef _sig_andn 132: 133: #define _SIG_SET_OP(name, op) \ 134: static inline void name(sigset_t *set) \ 135: { \ 136: extern void _NSIG_WORDS_is_unsupported_size(void); \ 137: \ 138: switch (_NSIG_WORDS) { \ 139: case 4: set->sig[3] = op(set->sig[3]); \ 140: set->sig[2] = op(set->sig[2]); \ 141: case 2: set->sig[1] = op(set->sig[1]); \ 142: case 1: set->sig[0] = op(set->sig[0]); \ 143: break; \ 144: default: \ 145: _NSIG_WORDS_is_unsupported_size(); \ 146: } \ 147: } 148: 149: #define _sig_not(x) (~(x)) 150: _SIG_SET_OP(signotset, _sig_not) 151: 152: #undef _SIG_SET_OP 153: #undef _sig_not 154: 155: static inline void sigemptyset(sigset_t *set) 156: { 157: switch (_NSIG_WORDS) { 158: default: 159: memset(set, 0, sizeof(sigset_t)); 160: break; 161: case 2: set->sig[1] = 0; 162: case 1: set->sig[0] = 0; 163: break; 164: } 165: } 166: 167: static inline void sigfillset(sigset_t *set) 168: { 169: switch (_NSIG_WORDS) { 170: default: 171: memset(set, -1, sizeof(sigset_t)); 172: break; 173: case 2: set->sig[1] = -1; 174: case 1: set->sig[0] = -1; 175: break; 176: } 177: } 178: 179: /* Some extensions for manipulating the low 32 signals in particular. */ 180: 181: static inline void sigaddsetmask(sigset_t *set, unsigned long mask) 182: { 183: set->sig[0] |= mask; 184: } 185: 186: static inline void sigdelsetmask(sigset_t *set, unsigned long mask) 187: { 188: set->sig[0] &= ~mask; 189: } 190: 191: static inline int sigtestsetmask(sigset_t *set, unsigned long mask) 192: { 193: return (set->sig[0] & mask) != 0; 194: } 195: 196: static inline void siginitset(sigset_t *set, unsigned long mask) 197: { 198: set->sig[0] = mask; 199: switch (_NSIG_WORDS) { 200: default: 201: memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1)); 202: break; 203: case 2: set->sig[1] = 0; 204: case 1: ; 205: } 206: } 207: 208: static inline void siginitsetinv(sigset_t *set, unsigned long mask) 209: { 210: set->sig[0] = ~mask; 211: switch (_NSIG_WORDS) { 212: default: 213: memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1)); 214: break; 215: case 2: set->sig[1] = -1; 216: case 1: ; 217: } 218: } 219: 220: #endif /* __HAVE_ARCH_SIG_SETOPS */ 221: 222: static inline void init_sigpending(struct sigpending *sig) 223: { 224: sigemptyset(&sig->signal); 225: INIT_LIST_HEAD(&sig->list); 226: } 227: 228: extern void flush_sigqueue(struct sigpending *queue); 229: 230: /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */ 231: static inline int valid_signal(unsigned long sig) 232: { 233: return sig <= _NSIG ? 1 : 0; 234: } 235: 236: struct timespec; 237: struct pt_regs; 238: 239: extern int next_signal(struct sigpending *pending, sigset_t *mask); 240: extern int do_send_sig_info(int sig, struct siginfo *info, 241: struct task_struct *p, bool group); 242: extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p); 243: extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *); 244: extern int do_sigtimedwait(const sigset_t *, siginfo_t *, 245: const struct timespec *); 246: extern int sigprocmask(int, sigset_t *, sigset_t *); 247: extern void set_current_blocked(sigset_t *); 248: extern void __set_current_blocked(const sigset_t *); 249: extern int show_unhandled_signals; 250: extern int sigsuspend(sigset_t *); 251: 252: struct sigaction { 253: #ifndef __ARCH_HAS_IRIX_SIGACTION 254: __sighandler_t sa_handler; 255: unsigned long sa_flags; 256: #else 257: unsigned int sa_flags; 258: __sighandler_t sa_handler; 259: #endif 260: #ifdef __ARCH_HAS_SA_RESTORER 261: __sigrestore_t sa_restorer; 262: #endif 263: sigset_t sa_mask; /* mask last for extensibility */ 264: }; 265: 266: struct k_sigaction { 267: struct sigaction sa; 268: #ifdef __ARCH_HAS_KA_RESTORER 269: __sigrestore_t ka_restorer; 270: #endif 271: }; 272: 273: #ifdef CONFIG_OLD_SIGACTION 274: struct old_sigaction { 275: __sighandler_t sa_handler; 276: old_sigset_t sa_mask; 277: unsigned long sa_flags; 278: __sigrestore_t sa_restorer; 279: }; 280: #endif 281: 282: struct ksignal { 283: struct k_sigaction ka; 284: siginfo_t info; 285: int sig; 286: }; 287: 288: extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie); 289: extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping); 290: extern void signal_delivered(int sig, siginfo_t *info, struct k_sigaction *ka, struct pt_regs *regs, int stepping); 291: extern void exit_signals(struct task_struct *tsk); 292: 293: /* 294: * Eventually that'll replace get_signal_to_deliver(); macro for now, 295: * to avoid nastiness with include order. 296: */ 297: #define get_signal(ksig) \ 298: ({ \ 299: struct ksignal *p = (ksig); \ 300: p->sig = get_signal_to_deliver(&p->info, &p->ka, \ 301: signal_pt_regs(), NULL);\ p->sig > 0; \ 303: }) 304: 305: extern struct kmem_cache *sighand_cachep; 306: 307: int unhandled_signal(struct task_struct *tsk, int sig); 308: 309: /* 310: * In POSIX a signal is sent either to a specific thread (Linux task) 311: * or to the process as a whole (Linux thread group). How the signal 312: * is sent determines whether it's to one thread or the whole group, 313: * which determines which signal mask(s) are involved in blocking it 314: * from being delivered until later. When the signal is delivered, 315: * either it's caught or ignored by a user handler or it has a default 316: * effect that applies to the whole thread group (POSIX process). 317: * 318: * The possible effects an unblocked signal set to SIG_DFL can have are: 319: * ignore - Nothing Happens 320: * terminate - kill the process, i.e. all threads in the group, 321: * similar to exit_group. The group leader (only) reports 322: * WIFSIGNALED status to its parent. 323: * coredump - write a core dump file describing all threads using 324: * the same mm and then kill all those threads 325: * stop - stop all the threads in the group, i.e. TASK_STOPPED state 326: * 327: * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored. 328: * Other signals when not blocked and set to SIG_DFL behaves as follows. 329: * The job control signals also have other special effects. 330: * 331: * +--------------------+------------------+ 332: * | POSIX signal | default action | 333: * +--------------------+------------------+ 334: * | SIGHUP | terminate | 335: * | SIGINT | terminate | 336: * | SIGQUIT | coredump | 337: * | SIGILL | coredump | 338: * | SIGTRAP | coredump | 339: * | SIGABRT/SIGIOT | coredump | 340: * | SIGBUS | coredump | 341: * | SIGFPE | coredump | 342: * | SIGKILL | terminate(+) | 343: * | SIGUSR1 | terminate | 344: * | SIGSEGV | coredump | 345: * | SIGUSR2 | terminate | 346: * | SIGPIPE | terminate | 347: * | SIGALRM | terminate | 348: * | SIGTERM | terminate | 349: * | SIGCHLD | ignore | 350: * | SIGCONT | ignore(*) | 351: * | SIGSTOP | stop(*)(+) | 352: * | SIGTSTP | stop(*) | 353: * | SIGTTIN | stop(*) | 354: * | SIGTTOU | stop(*) | 355: * | SIGURG | ignore | 356: * | SIGXCPU | coredump | 357: * | SIGXFSZ | coredump | 358: * | SIGVTALRM | terminate | 359: * | SIGPROF | terminate | 360: * | SIGPOLL/SIGIO | terminate | 361: * | SIGSYS/SIGUNUSED | coredump | 362: * | SIGSTKFLT | terminate | 363: * | SIGWINCH | ignore | 364: * | SIGPWR | terminate | 365: * | SIGRTMIN-SIGRTMAX | terminate | 366: * +--------------------+------------------+ 367: * | non-POSIX signal | default action | 368: * +--------------------+------------------+ 369: * | SIGEMT | coredump | 370: * +--------------------+------------------+ 371: * 372: * (+) For SIGKILL and SIGSTOP the action is "always", not just "default". 373: * (*) Special job control effects: 374: * When SIGCONT is sent, it resumes the process (all threads in the group) 375: * from TASK_STOPPED state and also clears any pending/queued stop signals 376: * (any of those marked with "stop(*)"). This happens regardless of blocking, 377: * catching, or ignoring SIGCONT. When any stop signal is sent, it clears 378: * any pending/queued SIGCONT signals; this happens regardless of blocking, 379: * catching, or ignored the stop signal, though (except for SIGSTOP) the 380: * default action of stopping the process may happen later or never. 381: */ 382: 383: #ifdef SIGEMT 384: #define SIGEMT_MASK rt_sigmask(SIGEMT) 385: #else 386: #define SIGEMT_MASK 0 387: #endif 388: 389: #if SIGRTMIN > BITS_PER_LONG 390: #define rt_sigmask(sig) (1ULL << ((sig)-1)) 391: #else 392: #define rt_sigmask(sig) sigmask(sig) 393: #endif 394: #define siginmask(sig, mask) (rt_sigmask(sig) & (mask)) 395: 396: #define SIG_KERNEL_ONLY_MASK (\ rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP)) 398: 399: #define SIG_KERNEL_STOP_MASK (\ rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \ 401: rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) ) 402: 403: #define SIG_KERNEL_COREDUMP_MASK (\ rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \ 405: rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \ 406: rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \ 407: rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \ 408: rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \ 409: SIGEMT_MASK ) 410: 411: #define SIG_KERNEL_IGNORE_MASK (\ rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \ 413: rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) ) 414: 415: #define sig_kernel_only(sig) \ 416: (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK)) 417: #define sig_kernel_coredump(sig) \ 418: (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK)) 419: #define sig_kernel_ignore(sig) \ 420: (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK)) 421: #define sig_kernel_stop(sig) \ 422: (((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK)) 423: 424: #define sig_user_defined(t, signr) \ 425: (((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \ 426: ((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN)) 427: 428: #define sig_fatal(t, signr) \ 429: (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \ 430: (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL) 431: 432: void signals_init(void); 433: 434: int restore_altstack(const stack_t __user *); 435: int __save_altstack(stack_t __user *, unsigned long); 436: 437: #define save_altstack_ex(uss, sp) do { \ 438: stack_t __user *__uss = uss; \ 439: struct task_struct *t = current; \ 440: put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \ 441: put_user_ex(sas_ss_flags(sp), &__uss->ss_flags); \ 442: put_user_ex(t->sas_ss_size, &__uss->ss_size); \ 443: } while (0); 444: 445: #ifdef CONFIG_PROC_FS 446: struct seq_file; 447: extern void render_sigset_t(struct seq_file *, const char *, sigset_t *); 448: #endif 449: 450: #endif /* _LINUX_SIGNAL_H */ 451: