forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
459 lines
12 KiB
459 lines
12 KiB
#ifndef _LINUX_SIGNAL_H |
|
#define _LINUX_SIGNAL_H |
|
|
|
#include <linux/list.h> |
|
#include <linux/bug.h> |
|
#include <uapi/linux/signal.h> |
|
|
|
struct task_struct; |
|
|
|
/* for sysctl */ |
|
extern int print_fatal_signals; |
|
/* |
|
* Real Time signals may be queued. |
|
*/ |
|
|
|
struct sigqueue { |
|
struct list_head list; |
|
int flags; |
|
siginfo_t info; |
|
struct user_struct *user; |
|
}; |
|
|
|
/* flags values. */ |
|
#define SIGQUEUE_PREALLOC 1 |
|
|
|
struct sigpending { |
|
struct list_head list; |
|
sigset_t signal; |
|
}; |
|
|
|
#ifndef HAVE_ARCH_COPY_SIGINFO |
|
|
|
#include <linux/string.h> |
|
|
|
static inline void copy_siginfo(struct siginfo *to, struct siginfo *from) |
|
{ |
|
if (from->si_code < 0) |
|
memcpy(to, from, sizeof(*to)); |
|
else |
|
/* _sigchld is currently the largest know union member */ |
|
memcpy(to, from, __ARCH_SI_PREAMBLE_SIZE + sizeof(from->_sifields._sigchld)); |
|
} |
|
|
|
#endif |
|
|
|
/* |
|
* 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; |
|
} |
|
} |
|
|
|
#define sigmask(sig) (1UL << ((sig) - 1)) |
|
|
|
#ifndef __HAVE_ARCH_SIG_SETOPS |
|
#include <linux/string.h> |
|
|
|
#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); \ |
|
case 2: \ |
|
a1 = a->sig[1]; b1 = b->sig[1]; \ |
|
r->sig[1] = op(a1, b1); \ |
|
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]); \ |
|
case 2: set->sig[1] = op(set->sig[1]); \ |
|
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; |
|
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; |
|
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; |
|
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; |
|
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; |
|
|
|
extern int next_signal(struct sigpending *pending, sigset_t *mask); |
|
extern int do_send_sig_info(int sig, struct siginfo *info, |
|
struct task_struct *p, bool group); |
|
extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p); |
|
extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *); |
|
extern int do_sigtimedwait(const sigset_t *, siginfo_t *, |
|
const struct timespec *); |
|
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; |
|
|
|
struct sigaction { |
|
#ifndef __ARCH_HAS_IRIX_SIGACTION |
|
__sighandler_t sa_handler; |
|
unsigned long sa_flags; |
|
#else |
|
unsigned int sa_flags; |
|
__sighandler_t sa_handler; |
|
#endif |
|
#ifdef __ARCH_HAS_SA_RESTORER |
|
__sigrestore_t sa_restorer; |
|
#endif |
|
sigset_t sa_mask; /* mask last for extensibility */ |
|
}; |
|
|
|
struct k_sigaction { |
|
struct sigaction sa; |
|
#ifdef __ARCH_HAS_KA_RESTORER |
|
__sigrestore_t ka_restorer; |
|
#endif |
|
}; |
|
|
|
#ifdef CONFIG_OLD_SIGACTION |
|
struct old_sigaction { |
|
__sighandler_t sa_handler; |
|
old_sigset_t sa_mask; |
|
unsigned long sa_flags; |
|
__sigrestore_t sa_restorer; |
|
}; |
|
#endif |
|
|
|
struct ksignal { |
|
struct k_sigaction ka; |
|
siginfo_t info; |
|
int sig; |
|
}; |
|
|
|
extern int 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); |
|
|
|
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, (__force_user __sighandler_t)2); |
|
} |
|
|
|
static inline void disallow_signal(int sig) |
|
{ |
|
kernel_sigaction(sig, SIG_IGN); |
|
} |
|
|
|
extern struct kmem_cache *sighand_cachep; |
|
|
|
int 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) < 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_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_user_defined(t, signr) \ |
|
(((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) && \ |
|
((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_IGN)) |
|
|
|
#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 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); \ |
|
put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \ |
|
put_user_ex(t->sas_ss_size, &__uss->ss_size); \ |
|
if (t->sas_ss_flags & SS_AUTODISARM) \ |
|
sas_ss_reset(t); \ |
|
} while (0); |
|
|
|
#ifdef CONFIG_PROC_FS |
|
struct seq_file; |
|
extern void render_sigset_t(struct seq_file *, const char *, sigset_t *); |
|
#endif |
|
|
|
#endif /* _LINUX_SIGNAL_H */
|
|
|