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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/bug.h>#include <linux/list.h>#include <linux/signal_types.h>#include <linux/string.h>
struct task_struct;
/* for sysctl */extern int print_fatal_signals;
static inline void copy_siginfo(kernel_siginfo_t *to, const kernel_siginfo_t *from){ memcpy(to, from, sizeof(*to));}
static inline void clear_siginfo(kernel_siginfo_t *info){ memset(info, 0, sizeof(*info));}
#define SI_EXPANSION_SIZE (sizeof(struct siginfo) - sizeof(struct kernel_siginfo))
static inline void copy_siginfo_to_external(siginfo_t *to, const kernel_siginfo_t *from){ memcpy(to, from, sizeof(*from)); memset(((char *)to) + sizeof(struct kernel_siginfo), 0, SI_EXPANSION_SIZE);}
int copy_siginfo_to_user(siginfo_t __user *to, const kernel_siginfo_t *from);int copy_siginfo_from_user(kernel_siginfo_t *to, const siginfo_t __user *from);
enum siginfo_layout { SIL_KILL, SIL_TIMER, SIL_POLL, SIL_FAULT, SIL_FAULT_TRAPNO, SIL_FAULT_MCEERR, SIL_FAULT_BNDERR, SIL_FAULT_PKUERR, SIL_FAULT_PERF_EVENT, SIL_CHLD, SIL_RT, SIL_SYS,};
enum siginfo_layout siginfo_layout(unsigned sig, int si_code);
/* * Define some primitives to manipulate sigset_t. */
#ifndef __HAVE_ARCH_SIG_BITOPS#include <linux/bitops.h>
/* We don't use <linux/bitops.h> for these because there is no need to be atomic. */static inline void sigaddset(sigset_t *set, int _sig){ unsigned long sig = _sig - 1; if (_NSIG_WORDS == 1) set->sig[0] |= 1UL << sig; else set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);}
static inline void sigdelset(sigset_t *set, int _sig){ unsigned long sig = _sig - 1; if (_NSIG_WORDS == 1) set->sig[0] &= ~(1UL << sig); else set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));}
static inline int sigismember(sigset_t *set, int _sig){ unsigned long sig = _sig - 1; if (_NSIG_WORDS == 1) return 1 & (set->sig[0] >> sig); else return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));}
#endif /* __HAVE_ARCH_SIG_BITOPS */
static inline int sigisemptyset(sigset_t *set){ switch (_NSIG_WORDS) { case 4: return (set->sig[3] | set->sig[2] | set->sig[1] | set->sig[0]) == 0; case 2: return (set->sig[1] | set->sig[0]) == 0; case 1: return set->sig[0] == 0; default: BUILD_BUG(); return 0; }}
static inline int sigequalsets(const sigset_t *set1, const sigset_t *set2){ switch (_NSIG_WORDS) { case 4: return (set1->sig[3] == set2->sig[3]) && (set1->sig[2] == set2->sig[2]) && (set1->sig[1] == set2->sig[1]) && (set1->sig[0] == set2->sig[0]); case 2: return (set1->sig[1] == set2->sig[1]) && (set1->sig[0] == set2->sig[0]); case 1: return set1->sig[0] == set2->sig[0]; } return 0;}
#define sigmask(sig) (1UL << ((sig) - 1))
#ifndef __HAVE_ARCH_SIG_SETOPS
#define _SIG_SET_BINOP(name, op) \static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \{ \ unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \ \ switch (_NSIG_WORDS) { \ case 4: \ a3 = a->sig[3]; a2 = a->sig[2]; \ b3 = b->sig[3]; b2 = b->sig[2]; \ r->sig[3] = op(a3, b3); \ r->sig[2] = op(a2, b2); \ fallthrough; \ case 2: \ a1 = a->sig[1]; b1 = b->sig[1]; \ r->sig[1] = op(a1, b1); \ fallthrough; \ case 1: \ a0 = a->sig[0]; b0 = b->sig[0]; \ r->sig[0] = op(a0, b0); \ break; \ default: \ BUILD_BUG(); \ } \}
#define _sig_or(x,y) ((x) | (y))_SIG_SET_BINOP(sigorsets, _sig_or)
#define _sig_and(x,y) ((x) & (y))_SIG_SET_BINOP(sigandsets, _sig_and)
#define _sig_andn(x,y) ((x) & ~(y))_SIG_SET_BINOP(sigandnsets, _sig_andn)
#undef _SIG_SET_BINOP#undef _sig_or#undef _sig_and#undef _sig_andn
#define _SIG_SET_OP(name, op) \static inline void name(sigset_t *set) \{ \ switch (_NSIG_WORDS) { \ case 4: set->sig[3] = op(set->sig[3]); \ set->sig[2] = op(set->sig[2]); \ fallthrough; \ case 2: set->sig[1] = op(set->sig[1]); \ fallthrough; \ case 1: set->sig[0] = op(set->sig[0]); \ break; \ default: \ BUILD_BUG(); \ } \}
#define _sig_not(x) (~(x))_SIG_SET_OP(signotset, _sig_not)
#undef _SIG_SET_OP#undef _sig_not
static inline void sigemptyset(sigset_t *set){ switch (_NSIG_WORDS) { default: memset(set, 0, sizeof(sigset_t)); break; case 2: set->sig[1] = 0; fallthrough; case 1: set->sig[0] = 0; break; }}
static inline void sigfillset(sigset_t *set){ switch (_NSIG_WORDS) { default: memset(set, -1, sizeof(sigset_t)); break; case 2: set->sig[1] = -1; fallthrough; case 1: set->sig[0] = -1; break; }}
/* Some extensions for manipulating the low 32 signals in particular. */
static inline void sigaddsetmask(sigset_t *set, unsigned long mask){ set->sig[0] |= mask;}
static inline void sigdelsetmask(sigset_t *set, unsigned long mask){ set->sig[0] &= ~mask;}
static inline int sigtestsetmask(sigset_t *set, unsigned long mask){ return (set->sig[0] & mask) != 0;}
static inline void siginitset(sigset_t *set, unsigned long mask){ set->sig[0] = mask; switch (_NSIG_WORDS) { default: memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1)); break; case 2: set->sig[1] = 0; break; case 1: ; }}
static inline void siginitsetinv(sigset_t *set, unsigned long mask){ set->sig[0] = ~mask; switch (_NSIG_WORDS) { default: memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1)); break; case 2: set->sig[1] = -1; break; case 1: ; }}
#endif /* __HAVE_ARCH_SIG_SETOPS */
static inline void init_sigpending(struct sigpending *sig){ sigemptyset(&sig->signal); INIT_LIST_HEAD(&sig->list);}
extern void flush_sigqueue(struct sigpending *queue);
/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */static inline int valid_signal(unsigned long sig){ return sig <= _NSIG ? 1 : 0;}
struct timespec;struct pt_regs;enum pid_type;
extern int next_signal(struct sigpending *pending, sigset_t *mask);extern int do_send_sig_info(int sig, struct kernel_siginfo *info, struct task_struct *p, enum pid_type type);extern int group_send_sig_info(int sig, struct kernel_siginfo *info, struct task_struct *p, enum pid_type type);extern int send_signal_locked(int sig, struct kernel_siginfo *info, struct task_struct *p, enum pid_type type);extern int sigprocmask(int, sigset_t *, sigset_t *);extern void set_current_blocked(sigset_t *);extern void __set_current_blocked(const sigset_t *);extern int show_unhandled_signals;
extern bool get_signal(struct ksignal *ksig);extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping);extern void exit_signals(struct task_struct *tsk);extern void kernel_sigaction(int, __sighandler_t);
#define SIG_KTHREAD ((__force __sighandler_t)2)#define SIG_KTHREAD_KERNEL ((__force __sighandler_t)3)
static inline void allow_signal(int sig){ /* * Kernel threads handle their own signals. Let the signal code * know it'll be handled, so that they don't get converted to * SIGKILL or just silently dropped. */ kernel_sigaction(sig, SIG_KTHREAD);}
static inline void allow_kernel_signal(int sig){ /* * Kernel threads handle their own signals. Let the signal code * know signals sent by the kernel will be handled, so that they * don't get silently dropped. */ kernel_sigaction(sig, SIG_KTHREAD_KERNEL);}
static inline void disallow_signal(int sig){ kernel_sigaction(sig, SIG_IGN);}
extern struct kmem_cache *sighand_cachep;
extern bool unhandled_signal(struct task_struct *tsk, int sig);
/* * In POSIX a signal is sent either to a specific thread (Linux task) * or to the process as a whole (Linux thread group). How the signal * is sent determines whether it's to one thread or the whole group, * which determines which signal mask(s) are involved in blocking it * from being delivered until later. When the signal is delivered, * either it's caught or ignored by a user handler or it has a default * effect that applies to the whole thread group (POSIX process). * * The possible effects an unblocked signal set to SIG_DFL can have are: * ignore - Nothing Happens * terminate - kill the process, i.e. all threads in the group, * similar to exit_group. The group leader (only) reports * WIFSIGNALED status to its parent. * coredump - write a core dump file describing all threads using * the same mm and then kill all those threads * stop - stop all the threads in the group, i.e. TASK_STOPPED state * * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored. * Other signals when not blocked and set to SIG_DFL behaves as follows. * The job control signals also have other special effects. * * +--------------------+------------------+ * | POSIX signal | default action | * +--------------------+------------------+ * | 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
#define siginmask(sig, mask) \ ((sig) > 0 && (sig) < SIGRTMIN && (rt_sigmask(sig) & (mask)))
#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) )
#define SIG_SPECIFIC_SICODES_MASK (\ rt_sigmask(SIGILL) | rt_sigmask(SIGFPE) | \ rt_sigmask(SIGSEGV) | rt_sigmask(SIGBUS) | \ rt_sigmask(SIGTRAP) | rt_sigmask(SIGCHLD) | \ rt_sigmask(SIGPOLL) | rt_sigmask(SIGSYS) | \ SIGEMT_MASK )
#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)#define sig_specific_sicodes(sig) siginmask(sig, SIG_SPECIFIC_SICODES_MASK)
#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)
void signals_init(void);
int restore_altstack(const stack_t __user *);int __save_altstack(stack_t __user *, unsigned long);
#define unsafe_save_altstack(uss, sp, label) do { \ stack_t __user *__uss = uss; \ struct task_struct *t = current; \ unsafe_put_user((void __user *)t->sas_ss_sp, &__uss->ss_sp, label); \ unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \ unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \} while (0);
#ifdef CONFIG_DYNAMIC_SIGFRAMEbool sigaltstack_size_valid(size_t ss_size);#elsestatic inline bool sigaltstack_size_valid(size_t size) { return true; }#endif /* !CONFIG_DYNAMIC_SIGFRAME */
#ifdef CONFIG_PROC_FSstruct seq_file;extern void render_sigset_t(struct seq_file *, const char *, sigset_t *);#endif
#ifndef arch_untagged_si_addr/* * Given a fault address and a signal and si_code which correspond to the * _sigfault union member, returns the address that must appear in si_addr if * the signal handler does not have SA_EXPOSE_TAGBITS enabled in sa_flags. */static inline void __user *arch_untagged_si_addr(void __user *addr, unsigned long sig, unsigned long si_code){ return addr;}#endif
#endif /* _LINUX_SIGNAL_H */