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marcus.erl |
#ifndef _LINUX_SIGNAL_H
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#define _LINUX_SIGNAL_H
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#include <asm/signal.h>
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#include <asm/siginfo.h>
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#ifdef __KERNEL__
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#include <linux/list.h>
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/*
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* Real Time signals may be queued.
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*/
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struct sigqueue {
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struct list_head list;
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int flags;
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siginfo_t info;
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struct user_struct *user;
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};
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/* flags values. */
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#define SIGQUEUE_PREALLOC 1
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struct sigpending {
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struct list_head list;
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sigset_t signal;
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};
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/*
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* Define some primitives to manipulate sigset_t.
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*/
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#ifndef __HAVE_ARCH_SIG_BITOPS
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#include <linux/bitops.h>
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/* We don't use <linux/bitops.h> for these because there is no need to
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be atomic. */
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static inline void sigaddset(sigset_t *set, int _sig)
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{
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unsigned long sig = _sig - 1;
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if (_NSIG_WORDS == 1)
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set->sig[0] |= 1UL << sig;
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else
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set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);
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}
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static inline void sigdelset(sigset_t *set, int _sig)
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{
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unsigned long sig = _sig - 1;
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if (_NSIG_WORDS == 1)
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set->sig[0] &= ~(1UL << sig);
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else
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set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
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}
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static inline int sigismember(sigset_t *set, int _sig)
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{
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unsigned long sig = _sig - 1;
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if (_NSIG_WORDS == 1)
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return 1 & (set->sig[0] >> sig);
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else
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return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
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}
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static inline int sigfindinword(unsigned long word)
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{
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return ffz(~word);
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}
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#endif /* __HAVE_ARCH_SIG_BITOPS */
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static inline int sigisemptyset(sigset_t *set)
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{
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extern void _NSIG_WORDS_is_unsupported_size(void);
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switch (_NSIG_WORDS) {
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case 4:
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return (set->sig[3] | set->sig[2] |
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set->sig[1] | set->sig[0]) == 0;
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case 2:
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return (set->sig[1] | set->sig[0]) == 0;
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case 1:
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return set->sig[0] == 0;
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default:
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_NSIG_WORDS_is_unsupported_size();
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return 0;
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}
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}
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#define sigmask(sig) (1UL << ((sig) - 1))
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#ifndef __HAVE_ARCH_SIG_SETOPS
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#include <linux/string.h>
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#define _SIG_SET_BINOP(name, op) \
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static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
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{ \
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extern void _NSIG_WORDS_is_unsupported_size(void); \
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unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \
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\
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switch (_NSIG_WORDS) { \
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case 4: \
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a3 = a->sig[3]; a2 = a->sig[2]; \
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b3 = b->sig[3]; b2 = b->sig[2]; \
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r->sig[3] = op(a3, b3); \
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r->sig[2] = op(a2, b2); \
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case 2: \
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a1 = a->sig[1]; b1 = b->sig[1]; \
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r->sig[1] = op(a1, b1); \
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case 1: \
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a0 = a->sig[0]; b0 = b->sig[0]; \
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r->sig[0] = op(a0, b0); \
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break; \
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default: \
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_NSIG_WORDS_is_unsupported_size(); \
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} \
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}
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#define _sig_or(x,y) ((x) | (y))
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_SIG_SET_BINOP(sigorsets, _sig_or)
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#define _sig_and(x,y) ((x) & (y))
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_SIG_SET_BINOP(sigandsets, _sig_and)
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#define _sig_nand(x,y) ((x) & ~(y))
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_SIG_SET_BINOP(signandsets, _sig_nand)
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#undef _SIG_SET_BINOP
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#undef _sig_or
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#undef _sig_and
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#undef _sig_nand
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#define _SIG_SET_OP(name, op) \
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static inline void name(sigset_t *set) \
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{ \
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extern void _NSIG_WORDS_is_unsupported_size(void); \
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\
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switch (_NSIG_WORDS) { \
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case 4: set->sig[3] = op(set->sig[3]); \
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set->sig[2] = op(set->sig[2]); \
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case 2: set->sig[1] = op(set->sig[1]); \
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case 1: set->sig[0] = op(set->sig[0]); \
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break; \
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default: \
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_NSIG_WORDS_is_unsupported_size(); \
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} \
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}
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#define _sig_not(x) (~(x))
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_SIG_SET_OP(signotset, _sig_not)
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#undef _SIG_SET_OP
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#undef _sig_not
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static inline void sigemptyset(sigset_t *set)
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{
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switch (_NSIG_WORDS) {
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default:
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memset(set, 0, sizeof(sigset_t));
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break;
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case 2: set->sig[1] = 0;
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case 1: set->sig[0] = 0;
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break;
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}
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}
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static inline void sigfillset(sigset_t *set)
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{
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switch (_NSIG_WORDS) {
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default:
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memset(set, -1, sizeof(sigset_t));
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break;
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case 2: set->sig[1] = -1;
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case 1: set->sig[0] = -1;
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break;
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}
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}
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/* Some extensions for manipulating the low 32 signals in particular. */
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static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
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{
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set->sig[0] |= mask;
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}
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static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
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{
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set->sig[0] &= ~mask;
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}
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static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
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{
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return (set->sig[0] & mask) != 0;
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}
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static inline void siginitset(sigset_t *set, unsigned long mask)
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{
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set->sig[0] = mask;
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switch (_NSIG_WORDS) {
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default:
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memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
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break;
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| 202 |
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case 2: set->sig[1] = 0;
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case 1: ;
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}
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| 205 |
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}
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static inline void siginitsetinv(sigset_t *set, unsigned long mask)
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{
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set->sig[0] = ~mask;
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switch (_NSIG_WORDS) {
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default:
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memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
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break;
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case 2: set->sig[1] = -1;
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case 1: ;
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}
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| 217 |
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}
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| 218 |
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| 219 |
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#endif /* __HAVE_ARCH_SIG_SETOPS */
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| 220 |
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| 221 |
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static inline void init_sigpending(struct sigpending *sig)
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| 222 |
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{
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| 223 |
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sigemptyset(&sig->signal);
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| 224 |
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INIT_LIST_HEAD(&sig->list);
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| 225 |
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}
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| 226 |
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| 227 |
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extern void flush_sigqueue(struct sigpending *queue);
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| 228 |
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| 229 |
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/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
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| 230 |
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static inline int valid_signal(unsigned long sig)
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| 231 |
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{
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| 232 |
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return sig <= _NSIG ? 1 : 0;
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| 233 |
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}
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| 234 |
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| 235 |
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extern int next_signal(struct sigpending *pending, sigset_t *mask);
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extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
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| 237 |
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extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
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| 238 |
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extern long do_sigpending(void __user *, unsigned long);
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| 239 |
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extern int sigprocmask(int, sigset_t *, sigset_t *);
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| 240 |
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extern int show_unhandled_signals;
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| 241 |
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| 242 |
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struct pt_regs;
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| 243 |
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extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
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| 244 |
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| 245 |
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extern struct kmem_cache *sighand_cachep;
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| 246 |
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| 247 |
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int unhandled_signal(struct task_struct *tsk, int sig);
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| 248 |
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| 249 |
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/*
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| 250 |
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* In POSIX a signal is sent either to a specific thread (Linux task)
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| 251 |
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* or to the process as a whole (Linux thread group). How the signal
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| 252 |
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* is sent determines whether it's to one thread or the whole group,
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| 253 |
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* which determines which signal mask(s) are involved in blocking it
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| 254 |
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* from being delivered until later. When the signal is delivered,
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| 255 |
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* either it's caught or ignored by a user handler or it has a default
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| 256 |
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* effect that applies to the whole thread group (POSIX process).
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| 257 |
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*
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| 258 |
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* The possible effects an unblocked signal set to SIG_DFL can have are:
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| 259 |
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* ignore - Nothing Happens
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| 260 |
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* terminate - kill the process, i.e. all threads in the group,
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| 261 |
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* similar to exit_group. The group leader (only) reports
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| 262 |
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* WIFSIGNALED status to its parent.
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| 263 |
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* coredump - write a core dump file describing all threads using
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| 264 |
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* the same mm and then kill all those threads
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| 265 |
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* stop - stop all the threads in the group, i.e. TASK_STOPPED state
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| 266 |
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*
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| 267 |
|
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* SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
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| 268 |
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* Other signals when not blocked and set to SIG_DFL behaves as follows.
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| 269 |
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* The job control signals also have other special effects.
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| 270 |
|
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*
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| 271 |
|
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* +--------------------+------------------+
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| 272 |
|
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* | POSIX signal | default action |
|
| 273 |
|
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* +--------------------+------------------+
|
| 274 |
|
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* | SIGHUP | terminate |
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| 275 |
|
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* | SIGINT | terminate |
|
| 276 |
|
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* | SIGQUIT | coredump |
|
| 277 |
|
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* | SIGILL | coredump |
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| 278 |
|
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* | SIGTRAP | coredump |
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| 279 |
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* | SIGABRT/SIGIOT | coredump |
|
| 280 |
|
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* | SIGBUS | coredump |
|
| 281 |
|
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* | SIGFPE | coredump |
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| 282 |
|
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* | SIGKILL | terminate(+) |
|
| 283 |
|
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* | SIGUSR1 | terminate |
|
| 284 |
|
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* | SIGSEGV | coredump |
|
| 285 |
|
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* | SIGUSR2 | terminate |
|
| 286 |
|
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* | SIGPIPE | terminate |
|
| 287 |
|
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* | SIGALRM | terminate |
|
| 288 |
|
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* | SIGTERM | terminate |
|
| 289 |
|
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* | SIGCHLD | ignore |
|
| 290 |
|
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* | SIGCONT | ignore(*) |
|
| 291 |
|
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* | SIGSTOP | stop(*)(+) |
|
| 292 |
|
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* | SIGTSTP | stop(*) |
|
| 293 |
|
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* | SIGTTIN | stop(*) |
|
| 294 |
|
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* | SIGTTOU | stop(*) |
|
| 295 |
|
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* | SIGURG | ignore |
|
| 296 |
|
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* | SIGXCPU | coredump |
|
| 297 |
|
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* | SIGXFSZ | coredump |
|
| 298 |
|
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* | SIGVTALRM | terminate |
|
| 299 |
|
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* | SIGPROF | terminate |
|
| 300 |
|
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* | SIGPOLL/SIGIO | terminate |
|
| 301 |
|
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* | SIGSYS/SIGUNUSED | coredump |
|
| 302 |
|
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* | SIGSTKFLT | terminate |
|
| 303 |
|
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* | SIGWINCH | ignore |
|
| 304 |
|
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* | SIGPWR | terminate |
|
| 305 |
|
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* | SIGRTMIN-SIGRTMAX | terminate |
|
| 306 |
|
|
* +--------------------+------------------+
|
| 307 |
|
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* | non-POSIX signal | default action |
|
| 308 |
|
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* +--------------------+------------------+
|
| 309 |
|
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* | SIGEMT | coredump |
|
| 310 |
|
|
* +--------------------+------------------+
|
| 311 |
|
|
*
|
| 312 |
|
|
* (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
|
| 313 |
|
|
* (*) Special job control effects:
|
| 314 |
|
|
* When SIGCONT is sent, it resumes the process (all threads in the group)
|
| 315 |
|
|
* from TASK_STOPPED state and also clears any pending/queued stop signals
|
| 316 |
|
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* (any of those marked with "stop(*)"). This happens regardless of blocking,
|
| 317 |
|
|
* catching, or ignoring SIGCONT. When any stop signal is sent, it clears
|
| 318 |
|
|
* any pending/queued SIGCONT signals; this happens regardless of blocking,
|
| 319 |
|
|
* catching, or ignored the stop signal, though (except for SIGSTOP) the
|
| 320 |
|
|
* default action of stopping the process may happen later or never.
|
| 321 |
|
|
*/
|
| 322 |
|
|
|
| 323 |
|
|
#ifdef SIGEMT
|
| 324 |
|
|
#define SIGEMT_MASK rt_sigmask(SIGEMT)
|
| 325 |
|
|
#else
|
| 326 |
|
|
#define SIGEMT_MASK 0
|
| 327 |
|
|
#endif
|
| 328 |
|
|
|
| 329 |
|
|
#if SIGRTMIN > BITS_PER_LONG
|
| 330 |
|
|
#define rt_sigmask(sig) (1ULL << ((sig)-1))
|
| 331 |
|
|
#else
|
| 332 |
|
|
#define rt_sigmask(sig) sigmask(sig)
|
| 333 |
|
|
#endif
|
| 334 |
|
|
#define siginmask(sig, mask) (rt_sigmask(sig) & (mask))
|
| 335 |
|
|
|
| 336 |
|
|
#define SIG_KERNEL_ONLY_MASK (\
|
| 337 |
|
|
rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP))
|
| 338 |
|
|
|
| 339 |
|
|
#define SIG_KERNEL_STOP_MASK (\
|
| 340 |
|
|
rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \
|
| 341 |
|
|
rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) )
|
| 342 |
|
|
|
| 343 |
|
|
#define SIG_KERNEL_COREDUMP_MASK (\
|
| 344 |
|
|
rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \
|
| 345 |
|
|
rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \
|
| 346 |
|
|
rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \
|
| 347 |
|
|
rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \
|
| 348 |
|
|
rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \
|
| 349 |
|
|
SIGEMT_MASK )
|
| 350 |
|
|
|
| 351 |
|
|
#define SIG_KERNEL_IGNORE_MASK (\
|
| 352 |
|
|
rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \
|
| 353 |
|
|
rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) )
|
| 354 |
|
|
|
| 355 |
|
|
#define sig_kernel_only(sig) \
|
| 356 |
|
|
(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_ONLY_MASK))
|
| 357 |
|
|
#define sig_kernel_coredump(sig) \
|
| 358 |
|
|
(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_COREDUMP_MASK))
|
| 359 |
|
|
#define sig_kernel_ignore(sig) \
|
| 360 |
|
|
(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_IGNORE_MASK))
|
| 361 |
|
|
#define sig_kernel_stop(sig) \
|
| 362 |
|
|
(((sig) < SIGRTMIN) && siginmask(sig, SIG_KERNEL_STOP_MASK))
|
| 363 |
|
|
|
| 364 |
|
|
#define sig_needs_tasklist(sig) ((sig) == SIGCONT)
|
| 365 |
|
|
|
| 366 |
|
|
#define sig_user_defined(t, signr) \
|
| 367 |
|
|
(((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \
|
| 368 |
|
|
((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN))
|
| 369 |
|
|
|
| 370 |
|
|
#define sig_fatal(t, signr) \
|
| 371 |
|
|
(!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
|
| 372 |
|
|
(t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
|
| 373 |
|
|
|
| 374 |
|
|
#endif /* __KERNEL__ */
|
| 375 |
|
|
|
| 376 |
|
|
#endif /* _LINUX_SIGNAL_H */
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