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492 lines
14 KiB
492 lines
14 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_SIGNAL_H |
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#define _LINUX_SIGNAL_H |
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#include <linux/bug.h> |
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#include <linux/signal_types.h> |
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#include <linux/string.h> |
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struct task_struct; |
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/* for sysctl */ |
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extern int print_fatal_signals; |
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static inline void copy_siginfo(kernel_siginfo_t *to, |
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const kernel_siginfo_t *from) |
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{ |
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memcpy(to, from, sizeof(*to)); |
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} |
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static inline void clear_siginfo(kernel_siginfo_t *info) |
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{ |
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memset(info, 0, sizeof(*info)); |
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} |
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#define SI_EXPANSION_SIZE (sizeof(struct siginfo) - sizeof(struct kernel_siginfo)) |
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static inline void copy_siginfo_to_external(siginfo_t *to, |
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const kernel_siginfo_t *from) |
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{ |
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memcpy(to, from, sizeof(*from)); |
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memset(((char *)to) + sizeof(struct kernel_siginfo), 0, |
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SI_EXPANSION_SIZE); |
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} |
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int copy_siginfo_to_user(siginfo_t __user *to, const kernel_siginfo_t *from); |
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int copy_siginfo_from_user(kernel_siginfo_t *to, const siginfo_t __user *from); |
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enum siginfo_layout { |
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SIL_KILL, |
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SIL_TIMER, |
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SIL_POLL, |
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SIL_FAULT, |
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SIL_FAULT_TRAPNO, |
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SIL_FAULT_MCEERR, |
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SIL_FAULT_BNDERR, |
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SIL_FAULT_PKUERR, |
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SIL_FAULT_PERF_EVENT, |
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SIL_CHLD, |
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SIL_RT, |
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SIL_SYS, |
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}; |
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enum siginfo_layout siginfo_layout(unsigned sig, int si_code); |
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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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#endif /* __HAVE_ARCH_SIG_BITOPS */ |
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static inline int sigisemptyset(sigset_t *set) |
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{ |
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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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BUILD_BUG(); |
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return 0; |
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} |
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} |
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static inline int sigequalsets(const sigset_t *set1, const sigset_t *set2) |
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{ |
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switch (_NSIG_WORDS) { |
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case 4: |
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return (set1->sig[3] == set2->sig[3]) && |
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(set1->sig[2] == set2->sig[2]) && |
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(set1->sig[1] == set2->sig[1]) && |
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(set1->sig[0] == set2->sig[0]); |
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case 2: |
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return (set1->sig[1] == set2->sig[1]) && |
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(set1->sig[0] == set2->sig[0]); |
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case 1: |
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return set1->sig[0] == set2->sig[0]; |
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} |
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return 0; |
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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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#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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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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fallthrough; \ |
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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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fallthrough; \ |
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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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BUILD_BUG(); \ |
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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_andn(x,y) ((x) & ~(y)) |
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_SIG_SET_BINOP(sigandnsets, _sig_andn) |
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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_andn |
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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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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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fallthrough; \ |
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case 2: set->sig[1] = op(set->sig[1]); \ |
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fallthrough; \ |
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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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BUILD_BUG(); \ |
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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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fallthrough; |
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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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fallthrough; |
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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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case 2: set->sig[1] = 0; |
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break; |
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case 1: ; |
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} |
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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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break; |
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case 1: ; |
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} |
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} |
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#endif /* __HAVE_ARCH_SIG_SETOPS */ |
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static inline void init_sigpending(struct sigpending *sig) |
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{ |
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sigemptyset(&sig->signal); |
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INIT_LIST_HEAD(&sig->list); |
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} |
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extern void flush_sigqueue(struct sigpending *queue); |
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/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */ |
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static inline int valid_signal(unsigned long sig) |
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{ |
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return sig <= _NSIG ? 1 : 0; |
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} |
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struct timespec; |
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struct pt_regs; |
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enum pid_type; |
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extern int next_signal(struct sigpending *pending, sigset_t *mask); |
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extern int do_send_sig_info(int sig, struct kernel_siginfo *info, |
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struct task_struct *p, enum pid_type type); |
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extern int group_send_sig_info(int sig, struct kernel_siginfo *info, |
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struct task_struct *p, enum pid_type type); |
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extern int send_signal_locked(int sig, struct kernel_siginfo *info, |
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struct task_struct *p, enum pid_type type); |
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extern int sigprocmask(int, sigset_t *, sigset_t *); |
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extern void set_current_blocked(sigset_t *); |
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extern void __set_current_blocked(const sigset_t *); |
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extern int show_unhandled_signals; |
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extern bool get_signal(struct ksignal *ksig); |
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extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping); |
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extern void exit_signals(struct task_struct *tsk); |
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extern void kernel_sigaction(int, __sighandler_t); |
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#define SIG_KTHREAD ((__force __sighandler_t)2) |
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#define SIG_KTHREAD_KERNEL ((__force __sighandler_t)3) |
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static inline void allow_signal(int sig) |
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{ |
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/* |
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* Kernel threads handle their own signals. Let the signal code |
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* know it'll be handled, so that they don't get converted to |
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* SIGKILL or just silently dropped. |
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*/ |
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kernel_sigaction(sig, SIG_KTHREAD); |
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} |
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static inline void allow_kernel_signal(int sig) |
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{ |
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/* |
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* Kernel threads handle their own signals. Let the signal code |
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* know signals sent by the kernel will be handled, so that they |
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* don't get silently dropped. |
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*/ |
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kernel_sigaction(sig, SIG_KTHREAD_KERNEL); |
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} |
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static inline void disallow_signal(int sig) |
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{ |
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kernel_sigaction(sig, SIG_IGN); |
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} |
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extern struct kmem_cache *sighand_cachep; |
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extern bool unhandled_signal(struct task_struct *tsk, int sig); |
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/* |
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* In POSIX a signal is sent either to a specific thread (Linux task) |
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* or to the process as a whole (Linux thread group). How the signal |
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* is sent determines whether it's to one thread or the whole group, |
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* which determines which signal mask(s) are involved in blocking it |
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* from being delivered until later. When the signal is delivered, |
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* either it's caught or ignored by a user handler or it has a default |
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* effect that applies to the whole thread group (POSIX process). |
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* |
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* The possible effects an unblocked signal set to SIG_DFL can have are: |
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* ignore - Nothing Happens |
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* terminate - kill the process, i.e. all threads in the group, |
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* similar to exit_group. The group leader (only) reports |
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* WIFSIGNALED status to its parent. |
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* coredump - write a core dump file describing all threads using |
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* the same mm and then kill all those threads |
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* stop - stop all the threads in the group, i.e. TASK_STOPPED state |
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* |
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* SIGKILL and SIGSTOP cannot be caught, blocked, or ignored. |
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* Other signals when not blocked and set to SIG_DFL behaves as follows. |
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* The job control signals also have other special effects. |
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* |
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* +--------------------+------------------+ |
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* | POSIX signal | default action | |
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* +--------------------+------------------+ |
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* | SIGHUP | terminate | |
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* | SIGINT | terminate | |
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* | SIGQUIT | coredump | |
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* | SIGILL | coredump | |
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* | SIGTRAP | coredump | |
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* | SIGABRT/SIGIOT | coredump | |
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* | SIGBUS | coredump | |
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* | SIGFPE | coredump | |
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* | SIGKILL | terminate(+) | |
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* | SIGUSR1 | terminate | |
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* | SIGSEGV | coredump | |
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* | SIGUSR2 | terminate | |
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* | SIGPIPE | terminate | |
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* | SIGALRM | terminate | |
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* | SIGTERM | terminate | |
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* | SIGCHLD | ignore | |
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* | SIGCONT | ignore(*) | |
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* | SIGSTOP | stop(*)(+) | |
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* | SIGTSTP | stop(*) | |
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* | SIGTTIN | stop(*) | |
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* | SIGTTOU | stop(*) | |
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* | SIGURG | ignore | |
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* | SIGXCPU | coredump | |
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* | SIGXFSZ | coredump | |
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* | SIGVTALRM | terminate | |
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* | SIGPROF | terminate | |
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* | SIGPOLL/SIGIO | terminate | |
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* | SIGSYS/SIGUNUSED | coredump | |
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* | SIGSTKFLT | terminate | |
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* | SIGWINCH | ignore | |
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* | SIGPWR | terminate | |
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* | SIGRTMIN-SIGRTMAX | terminate | |
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* +--------------------+------------------+ |
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* | non-POSIX signal | default action | |
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* +--------------------+------------------+ |
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* | SIGEMT | coredump | |
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* +--------------------+------------------+ |
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* |
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* (+) For SIGKILL and SIGSTOP the action is "always", not just "default". |
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* (*) Special job control effects: |
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* When SIGCONT is sent, it resumes the process (all threads in the group) |
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* from TASK_STOPPED state and also clears any pending/queued stop signals |
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* (any of those marked with "stop(*)"). This happens regardless of blocking, |
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* catching, or ignoring SIGCONT. When any stop signal is sent, it clears |
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* any pending/queued SIGCONT signals; this happens regardless of blocking, |
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* catching, or ignored the stop signal, though (except for SIGSTOP) the |
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* default action of stopping the process may happen later or never. |
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*/ |
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#ifdef SIGEMT |
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#define SIGEMT_MASK rt_sigmask(SIGEMT) |
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#else |
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#define SIGEMT_MASK 0 |
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#endif |
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#if SIGRTMIN > BITS_PER_LONG |
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#define rt_sigmask(sig) (1ULL << ((sig)-1)) |
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#else |
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#define rt_sigmask(sig) sigmask(sig) |
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#endif |
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#define siginmask(sig, mask) \ |
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((sig) > 0 && (sig) < SIGRTMIN && (rt_sigmask(sig) & (mask))) |
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#define SIG_KERNEL_ONLY_MASK (\ |
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rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP)) |
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#define SIG_KERNEL_STOP_MASK (\ |
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rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \ |
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rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) ) |
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#define SIG_KERNEL_COREDUMP_MASK (\ |
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rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \ |
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rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \ |
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rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \ |
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rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \ |
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rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \ |
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SIGEMT_MASK ) |
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#define SIG_KERNEL_IGNORE_MASK (\ |
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rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \ |
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rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) ) |
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#define SIG_SPECIFIC_SICODES_MASK (\ |
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rt_sigmask(SIGILL) | rt_sigmask(SIGFPE) | \ |
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rt_sigmask(SIGSEGV) | rt_sigmask(SIGBUS) | \ |
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rt_sigmask(SIGTRAP) | rt_sigmask(SIGCHLD) | \ |
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rt_sigmask(SIGPOLL) | rt_sigmask(SIGSYS) | \ |
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SIGEMT_MASK ) |
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#define sig_kernel_only(sig) siginmask(sig, SIG_KERNEL_ONLY_MASK) |
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#define sig_kernel_coredump(sig) siginmask(sig, SIG_KERNEL_COREDUMP_MASK) |
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#define sig_kernel_ignore(sig) siginmask(sig, SIG_KERNEL_IGNORE_MASK) |
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#define sig_kernel_stop(sig) siginmask(sig, SIG_KERNEL_STOP_MASK) |
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#define sig_specific_sicodes(sig) siginmask(sig, SIG_SPECIFIC_SICODES_MASK) |
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#define sig_fatal(t, signr) \ |
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(!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \ |
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(t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL) |
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void signals_init(void); |
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int restore_altstack(const stack_t __user *); |
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int __save_altstack(stack_t __user *, unsigned long); |
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#define unsafe_save_altstack(uss, sp, label) do { \ |
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stack_t __user *__uss = uss; \ |
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struct task_struct *t = current; \ |
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unsafe_put_user((void __user *)t->sas_ss_sp, &__uss->ss_sp, label); \ |
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unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \ |
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unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \ |
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} while (0); |
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#ifdef CONFIG_DYNAMIC_SIGFRAME |
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bool sigaltstack_size_valid(size_t ss_size); |
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#else |
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static inline bool sigaltstack_size_valid(size_t size) { return true; } |
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#endif /* !CONFIG_DYNAMIC_SIGFRAME */ |
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#ifdef CONFIG_PROC_FS |
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struct seq_file; |
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extern void render_sigset_t(struct seq_file *, const char *, sigset_t *); |
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#endif |
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#ifndef arch_untagged_si_addr |
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/* |
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* Given a fault address and a signal and si_code which correspond to the |
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* _sigfault union member, returns the address that must appear in si_addr if |
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* the signal handler does not have SA_EXPOSE_TAGBITS enabled in sa_flags. |
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*/ |
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static inline void __user *arch_untagged_si_addr(void __user *addr, |
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unsigned long sig, |
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unsigned long si_code) |
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{ |
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return addr; |
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} |
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#endif |
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#endif /* _LINUX_SIGNAL_H */
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