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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /* 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(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_SIGFRAME
 bool sigaltstack_size_valid(size_t ss_size);
 #else
 static inline bool sigaltstack_size_valid(size_t size) { return true; }
 #endif /* !CONFIG_DYNAMIC_SIGFRAME */
 
 #ifdef CONFIG_PROC_FS
 struct 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 */

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