2005-04-17 05:20:36 +07:00
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#ifndef _LINUX_SIGNAL_H
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#define _LINUX_SIGNAL_H
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2014-10-14 05:53:33 +07:00
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#include <linux/bug.h>
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2017-02-04 05:43:50 +07:00
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#include <linux/signal_types.h>
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2017-06-04 02:00:59 +07:00
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#include <linux/string.h>
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2005-04-17 05:20:36 +07:00
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2011-05-20 08:11:53 +07:00
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struct task_struct;
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2010-03-11 06:23:59 +07:00
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/* for sysctl */
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extern int print_fatal_signals;
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2005-04-17 05:20:36 +07:00
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2016-02-09 01:43:50 +07:00
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static inline void copy_siginfo(struct siginfo *to, struct siginfo *from)
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{
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if (from->si_code < 0)
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memcpy(to, from, sizeof(*to));
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else
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/* _sigchld is currently the largest know union member */
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memcpy(to, from, __ARCH_SI_PREAMBLE_SIZE + sizeof(from->_sifields._sigchld));
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}
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2017-06-04 02:01:01 +07:00
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int copy_siginfo_to_user(struct siginfo __user *to, const struct siginfo *from);
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2005-04-17 05:20:36 +07:00
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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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2006-01-08 16:02:48 +07:00
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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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2014-10-14 05:53:33 +07:00
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BUILD_BUG();
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2006-01-08 16:02:48 +07:00
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return 0;
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}
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}
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2016-12-15 06:04:10 +07:00
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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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2005-04-17 05:20:36 +07:00
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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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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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2014-10-14 05:53:33 +07:00
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case 4: \
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2005-04-17 05:20:36 +07:00
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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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2014-10-14 05:53:33 +07:00
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case 2: \
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2005-04-17 05:20:36 +07:00
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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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2014-10-14 05:53:33 +07:00
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case 1: \
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2005-04-17 05:20:36 +07:00
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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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2014-10-14 05:53:33 +07:00
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default: \
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BUILD_BUG(); \
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2005-04-17 05:20:36 +07:00
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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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2011-04-28 03:01:27 +07:00
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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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2005-04-17 05:20:36 +07:00
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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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2011-04-28 03:01:27 +07:00
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#undef _sig_andn
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2005-04-17 05:20:36 +07:00
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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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2014-10-14 05:53:33 +07:00
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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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2005-04-17 05:20:36 +07:00
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break; \
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2014-10-14 05:53:33 +07:00
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default: \
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BUILD_BUG(); \
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2005-04-17 05:20:36 +07:00
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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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case 2: set->sig[1] = 0;
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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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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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2006-03-29 07:11:18 +07:00
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extern void flush_sigqueue(struct sigpending *queue);
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2005-05-01 22:59:13 +07:00
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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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2011-05-18 20:08:03 +07:00
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struct timespec;
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struct pt_regs;
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signal/timer/event: signalfd core
This patch series implements the new signalfd() system call.
I took part of the original Linus code (and you know how badly it can be
broken :), and I added even more breakage ;) Signals are fetched from the same
signal queue used by the process, so signalfd will compete with standard
kernel delivery in dequeue_signal(). If you want to reliably fetch signals on
the signalfd file, you need to block them with sigprocmask(SIG_BLOCK). This
seems to be working fine on my Dual Opteron machine. I made a quick test
program for it:
http://www.xmailserver.org/signafd-test.c
The signalfd() system call implements signal delivery into a file descriptor
receiver. The signalfd file descriptor if created with the following API:
int signalfd(int ufd, const sigset_t *mask, size_t masksize);
The "ufd" parameter allows to change an existing signalfd sigmask, w/out going
to close/create cycle (Linus idea). Use "ufd" == -1 if you want a brand new
signalfd file.
The "mask" allows to specify the signal mask of signals that we are interested
in. The "masksize" parameter is the size of "mask".
The signalfd fd supports the poll(2) and read(2) system calls. The poll(2)
will return POLLIN when signals are available to be dequeued. As a direct
consequence of supporting the Linux poll subsystem, the signalfd fd can use
used together with epoll(2) too.
The read(2) system call will return a "struct signalfd_siginfo" structure in
the userspace supplied buffer. The return value is the number of bytes copied
in the supplied buffer, or -1 in case of error. The read(2) call can also
return 0, in case the sighand structure to which the signalfd was attached,
has been orphaned. The O_NONBLOCK flag is also supported, and read(2) will
return -EAGAIN in case no signal is available.
If the size of the buffer passed to read(2) is lower than sizeof(struct
signalfd_siginfo), -EINVAL is returned. A read from the signalfd can also
return -ERESTARTSYS in case a signal hits the process. The format of the
struct signalfd_siginfo is, and the valid fields depends of the (->code &
__SI_MASK) value, in the same way a struct siginfo would:
struct signalfd_siginfo {
__u32 signo; /* si_signo */
__s32 err; /* si_errno */
__s32 code; /* si_code */
__u32 pid; /* si_pid */
__u32 uid; /* si_uid */
__s32 fd; /* si_fd */
__u32 tid; /* si_fd */
__u32 band; /* si_band */
__u32 overrun; /* si_overrun */
__u32 trapno; /* si_trapno */
__s32 status; /* si_status */
__s32 svint; /* si_int */
__u64 svptr; /* si_ptr */
__u64 utime; /* si_utime */
__u64 stime; /* si_stime */
__u64 addr; /* si_addr */
};
[akpm@linux-foundation.org: fix signalfd_copyinfo() on i386]
Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-11 12:23:13 +07:00
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extern int next_signal(struct sigpending *pending, sigset_t *mask);
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2009-09-24 05:57:00 +07:00
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extern int do_send_sig_info(int sig, struct siginfo *info,
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struct task_struct *p, bool group);
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2005-04-17 05:20:36 +07:00
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extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
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extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
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extern int sigprocmask(int, sigset_t *, sigset_t *);
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2012-04-28 00:58:59 +07:00
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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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2007-07-22 16:12:28 +07:00
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extern int show_unhandled_signals;
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2005-04-17 05:20:36 +07:00
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2013-10-07 20:26:57 +07:00
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extern int get_signal(struct ksignal *ksig);
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2012-11-08 03:11:25 +07:00
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extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping);
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2008-02-08 19:19:12 +07:00
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extern void exit_signals(struct task_struct *tsk);
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2014-06-07 04:37:00 +07:00
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extern void kernel_sigaction(int, __sighandler_t);
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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, (__force __sighandler_t)2);
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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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2005-04-17 05:20:36 +07:00
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2006-12-07 11:32:47 +07:00
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extern struct kmem_cache *sighand_cachep;
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2007-07-22 16:12:28 +07:00
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int unhandled_signal(struct task_struct *tsk, int sig);
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2007-05-09 16:33:37 +07:00
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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.
|
|
|
|
* 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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|
* | SIGHUP | terminate |
|
|
|
|
* | SIGINT | terminate |
|
|
|
|
* | SIGQUIT | coredump |
|
|
|
|
* | SIGILL | coredump |
|
|
|
|
* | SIGTRAP | coredump |
|
|
|
|
* | SIGABRT/SIGIOT | coredump |
|
|
|
|
* | SIGBUS | coredump |
|
|
|
|
* | SIGFPE | coredump |
|
|
|
|
* | SIGKILL | terminate(+) |
|
|
|
|
* | SIGUSR1 | terminate |
|
|
|
|
* | SIGSEGV | coredump |
|
|
|
|
* | SIGUSR2 | terminate |
|
|
|
|
* | SIGPIPE | terminate |
|
|
|
|
* | SIGALRM | terminate |
|
|
|
|
* | SIGTERM | terminate |
|
|
|
|
* | SIGCHLD | ignore |
|
|
|
|
* | SIGCONT | ignore(*) |
|
|
|
|
* | SIGSTOP | stop(*)(+) |
|
|
|
|
* | SIGTSTP | stop(*) |
|
|
|
|
* | SIGTTIN | stop(*) |
|
|
|
|
* | SIGTTOU | stop(*) |
|
|
|
|
* | SIGURG | ignore |
|
|
|
|
* | SIGXCPU | coredump |
|
|
|
|
* | SIGXFSZ | coredump |
|
|
|
|
* | SIGVTALRM | terminate |
|
|
|
|
* | SIGPROF | terminate |
|
|
|
|
* | SIGPOLL/SIGIO | terminate |
|
|
|
|
* | SIGSYS/SIGUNUSED | coredump |
|
|
|
|
* | SIGSTKFLT | terminate |
|
|
|
|
* | SIGWINCH | ignore |
|
|
|
|
* | SIGPWR | terminate |
|
|
|
|
* | SIGRTMIN-SIGRTMAX | terminate |
|
|
|
|
* +--------------------+------------------+
|
|
|
|
* | non-POSIX signal | default action |
|
|
|
|
* +--------------------+------------------+
|
|
|
|
* | SIGEMT | coredump |
|
|
|
|
* +--------------------+------------------+
|
|
|
|
*
|
|
|
|
* (+) For SIGKILL and SIGSTOP the action is "always", not just "default".
|
|
|
|
* (*) Special job control effects:
|
|
|
|
* When SIGCONT is sent, it resumes the process (all threads in the group)
|
|
|
|
* from TASK_STOPPED state and also clears any pending/queued stop signals
|
|
|
|
* (any of those marked with "stop(*)"). This happens regardless of blocking,
|
|
|
|
* catching, or ignoring SIGCONT. When any stop signal is sent, it clears
|
|
|
|
* any pending/queued SIGCONT signals; this happens regardless of blocking,
|
|
|
|
* catching, or ignored the stop signal, though (except for SIGSTOP) the
|
|
|
|
* default action of stopping the process may happen later or never.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#ifdef SIGEMT
|
|
|
|
#define SIGEMT_MASK rt_sigmask(SIGEMT)
|
|
|
|
#else
|
|
|
|
#define SIGEMT_MASK 0
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#if SIGRTMIN > BITS_PER_LONG
|
|
|
|
#define rt_sigmask(sig) (1ULL << ((sig)-1))
|
|
|
|
#else
|
|
|
|
#define rt_sigmask(sig) sigmask(sig)
|
|
|
|
#endif
|
2016-05-24 06:24:02 +07:00
|
|
|
|
|
|
|
#define siginmask(sig, mask) \
|
|
|
|
((sig) < SIGRTMIN && (rt_sigmask(sig) & (mask)))
|
2007-05-09 16:33:37 +07:00
|
|
|
|
|
|
|
#define SIG_KERNEL_ONLY_MASK (\
|
|
|
|
rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP))
|
|
|
|
|
|
|
|
#define SIG_KERNEL_STOP_MASK (\
|
|
|
|
rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \
|
|
|
|
rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) )
|
|
|
|
|
|
|
|
#define SIG_KERNEL_COREDUMP_MASK (\
|
|
|
|
rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \
|
|
|
|
rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \
|
|
|
|
rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \
|
|
|
|
rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \
|
|
|
|
rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \
|
|
|
|
SIGEMT_MASK )
|
|
|
|
|
|
|
|
#define SIG_KERNEL_IGNORE_MASK (\
|
|
|
|
rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \
|
|
|
|
rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) )
|
|
|
|
|
2016-05-24 06:24:02 +07:00
|
|
|
#define sig_kernel_only(sig) siginmask(sig, SIG_KERNEL_ONLY_MASK)
|
|
|
|
#define sig_kernel_coredump(sig) siginmask(sig, SIG_KERNEL_COREDUMP_MASK)
|
|
|
|
#define sig_kernel_ignore(sig) siginmask(sig, SIG_KERNEL_IGNORE_MASK)
|
|
|
|
#define sig_kernel_stop(sig) siginmask(sig, SIG_KERNEL_STOP_MASK)
|
2007-05-09 16:33:37 +07:00
|
|
|
|
|
|
|
#define sig_fatal(t, signr) \
|
|
|
|
(!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \
|
|
|
|
(t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)
|
|
|
|
|
2008-02-06 16:36:44 +07:00
|
|
|
void signals_init(void);
|
|
|
|
|
2012-11-19 03:29:16 +07:00
|
|
|
int restore_altstack(const stack_t __user *);
|
2012-11-21 02:24:26 +07:00
|
|
|
int __save_altstack(stack_t __user *, unsigned long);
|
2012-11-19 03:29:16 +07:00
|
|
|
|
2013-09-02 02:35:01 +07:00
|
|
|
#define save_altstack_ex(uss, sp) do { \
|
|
|
|
stack_t __user *__uss = uss; \
|
|
|
|
struct task_struct *t = current; \
|
|
|
|
put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \
|
2016-04-15 03:20:04 +07:00
|
|
|
put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
|
2013-09-02 02:35:01 +07:00
|
|
|
put_user_ex(t->sas_ss_size, &__uss->ss_size); \
|
2016-04-15 03:20:04 +07:00
|
|
|
if (t->sas_ss_flags & SS_AUTODISARM) \
|
|
|
|
sas_ss_reset(t); \
|
2013-09-02 02:35:01 +07:00
|
|
|
} while (0);
|
|
|
|
|
2013-04-12 08:29:19 +07:00
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
struct seq_file;
|
|
|
|
extern void render_sigset_t(struct seq_file *, const char *, sigset_t *);
|
|
|
|
#endif
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
#endif /* _LINUX_SIGNAL_H */
|