v4.19.13 snapshot.
diff --git a/include/linux/signal.h b/include/linux/signal.h
new file mode 100644
index 0000000..e4d0146
--- /dev/null
+++ b/include/linux/signal.h
@@ -0,0 +1,439 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_SIGNAL_H
+#define _LINUX_SIGNAL_H
+
+#include <linux/bug.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(struct siginfo *to, const struct siginfo *from)
+{
+ memcpy(to, from, sizeof(*to));
+}
+
+static inline void clear_siginfo(struct siginfo *info)
+{
+ memset(info, 0, sizeof(*info));
+}
+
+int copy_siginfo_to_user(struct siginfo __user *to, const struct siginfo *from);
+
+enum siginfo_layout {
+ SIL_KILL,
+ SIL_TIMER,
+ SIL_POLL,
+ SIL_FAULT,
+ SIL_FAULT_MCEERR,
+ SIL_FAULT_BNDERR,
+ SIL_FAULT_PKUERR,
+ 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
+#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;
+enum pid_type;
+
+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, enum pid_type type);
+extern int group_send_sig_info(int sig, struct siginfo *info,
+ struct task_struct *p, enum pid_type type);
+extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
+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);
+
+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 __sighandler_t)2);
+}
+
+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) < 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 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 */