sched/headers: Move task_struct::signal and task_struct::sighand types and...

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/signal.h>

#include <linux/sched.h>

#include <linux/sched/signal.h>

#include <linux/init.h>

#include <asm/thread_notify.h>

 *

 * FIXME! These routines have not been tested for big endian case.

 */

#include <linux/sched.h>

#include <linux/signal.h>

#include <linux/sched/signal.h>

#include <linux/io.h>

#include <cpu/fpu.h>

#include <asm/processor.h>

#include <linux/module.h>

#include <linux/skbuff.h>

#include <linux/cache.h>

#include <linux/sched.h>

#include <linux/sched/signal.h>

#include <linux/types.h>

#include <linux/slab.h>

#include <linux/wait.h>

struct filename;

struct nameidata;

struct signal_struct;

struct sighand_struct;

extern unsigned long total_forks;

extern int nr_threads;

DECLARE_PER_CPU(unsigned long, process_counts);

static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}

#endif

struct sighand_struct {

	atomic_t		count;

	struct k_sigaction	action[_NSIG];

	spinlock_t		siglock;

	wait_queue_head_t	signalfd_wqh;

};

struct pacct_struct {

	int			ac_flag;

	long			ac_exitcode;

#include <linux/rwsem.h>

struct autogroup;

/*

 * NOTE! "signal_struct" does not have its own

 * locking, because a shared signal_struct always

 * implies a shared sighand_struct, so locking

 * sighand_struct is always a proper superset of

 * the locking of signal_struct.

 */

struct signal_struct {

	atomic_t		sigcnt;

	atomic_t		live;

	int			nr_threads;

	struct list_head	thread_head;

	wait_queue_head_t	wait_chldexit;	/* for wait4() */

	/* current thread group signal load-balancing target: */

	struct task_struct	*curr_target;

	/* shared signal handling: */

	struct sigpending	shared_pending;

	/* thread group exit support */

	int			group_exit_code;

	/* overloaded:

	 * - notify group_exit_task when ->count is equal to notify_count

	 * - everyone except group_exit_task is stopped during signal delivery

	 *   of fatal signals, group_exit_task processes the signal.

	 */

	int			notify_count;

	struct task_struct	*group_exit_task;

	/* thread group stop support, overloads group_exit_code too */

	int			group_stop_count;

	unsigned int		flags; /* see SIGNAL_* flags below */

	/*

	 * PR_SET_CHILD_SUBREAPER marks a process, like a service

	 * manager, to re-parent orphan (double-forking) child processes

	 * to this process instead of 'init'. The service manager is

	 * able to receive SIGCHLD signals and is able to investigate

	 * the process until it calls wait(). All children of this

	 * process will inherit a flag if they should look for a

	 * child_subreaper process at exit.

	 */

	unsigned int		is_child_subreaper:1;

	unsigned int		has_child_subreaper:1;

#ifdef CONFIG_POSIX_TIMERS

	/* POSIX.1b Interval Timers */

	int			posix_timer_id;

	struct list_head	posix_timers;

	/* ITIMER_REAL timer for the process */

	struct hrtimer real_timer;

	ktime_t it_real_incr;

	/*

	 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use

	 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these

	 * values are defined to 0 and 1 respectively

	 */

	struct cpu_itimer it[2];

	/*

	 * Thread group totals for process CPU timers.

	 * See thread_group_cputimer(), et al, for details.

	 */

	struct thread_group_cputimer cputimer;

	/* Earliest-expiration cache. */

	struct task_cputime cputime_expires;

	struct list_head cpu_timers[3];

#endif

	struct pid *leader_pid;

#ifdef CONFIG_NO_HZ_FULL

	atomic_t tick_dep_mask;

#endif

	struct pid *tty_old_pgrp;

	/* boolean value for session group leader */

	int leader;

	struct tty_struct *tty; /* NULL if no tty */

#ifdef CONFIG_SCHED_AUTOGROUP

	struct autogroup *autogroup;

#endif

	/*

	 * Cumulative resource counters for dead threads in the group,

	 * and for reaped dead child processes forked by this group.

	 * Live threads maintain their own counters and add to these

	 * in __exit_signal, except for the group leader.

	 */

	seqlock_t stats_lock;

	u64 utime, stime, cutime, cstime;

	u64 gtime;

	u64 cgtime;

	struct prev_cputime prev_cputime;

	unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;

	unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;

	unsigned long inblock, oublock, cinblock, coublock;

	unsigned long maxrss, cmaxrss;

	struct task_io_accounting ioac;

	/*

	 * Cumulative ns of schedule CPU time fo dead threads in the

	 * group, not including a zombie group leader, (This only differs

	 * from jiffies_to_ns(utime + stime) if sched_clock uses something

	 * other than jiffies.)

	 */

	unsigned long long sum_sched_runtime;

	/*

	 * We don't bother to synchronize most readers of this at all,

	 * because there is no reader checking a limit that actually needs

	 * to get both rlim_cur and rlim_max atomically, and either one

	 * alone is a single word that can safely be read normally.

	 * getrlimit/setrlimit use task_lock(current->group_leader) to

	 * protect this instead of the siglock, because they really

	 * have no need to disable irqs.

	 */

	struct rlimit rlim[RLIM_NLIMITS];

#ifdef CONFIG_BSD_PROCESS_ACCT

	struct pacct_struct pacct;	/* per-process accounting information */

#endif

#ifdef CONFIG_TASKSTATS

	struct taskstats *stats;

#endif

#ifdef CONFIG_AUDIT

	unsigned audit_tty;

	struct tty_audit_buf *tty_audit_buf;

#endif

	/*

	 * Thread is the potential origin of an oom condition; kill first on

	 * oom

	 */

	bool oom_flag_origin;

	short oom_score_adj;		/* OOM kill score adjustment */

	short oom_score_adj_min;	/* OOM kill score adjustment min value.

					 * Only settable by CAP_SYS_RESOURCE. */

	struct mm_struct *oom_mm;	/* recorded mm when the thread group got

					 * killed by the oom killer */

	struct mutex cred_guard_mutex;	/* guard against foreign influences on

					 * credential calculations

					 * (notably. ptrace) */

};

/*

 * Bits in flags field of signal_struct.

 */

#define SIGNAL_STOP_STOPPED	0x00000001 /* job control stop in effect */

#define SIGNAL_STOP_CONTINUED	0x00000002 /* SIGCONT since WCONTINUED reap */

#define SIGNAL_GROUP_EXIT	0x00000004 /* group exit in progress */

#define SIGNAL_GROUP_COREDUMP	0x00000008 /* coredump in progress */

/*

 * Pending notifications to parent.

 */

#define SIGNAL_CLD_STOPPED	0x00000010

#define SIGNAL_CLD_CONTINUED	0x00000020

#define SIGNAL_CLD_MASK		(SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)

#define SIGNAL_UNKILLABLE	0x00000040 /* for init: ignore fatal signals */

#define SIGNAL_STOP_MASK (SIGNAL_CLD_MASK | SIGNAL_STOP_STOPPED | \

			  SIGNAL_STOP_CONTINUED)

static inline void signal_set_stop_flags(struct signal_struct *sig,

					 unsigned int flags)

{

	WARN_ON(sig->flags & (SIGNAL_GROUP_EXIT|SIGNAL_GROUP_COREDUMP));

	sig->flags = (sig->flags & ~SIGNAL_STOP_MASK) | flags;

}

/* If true, all threads except ->group_exit_task have pending SIGKILL */

static inline int signal_group_exit(const struct signal_struct *sig)

{

	return	(sig->flags & SIGNAL_GROUP_EXIT) ||

		(sig->group_exit_task != NULL);

}

/*

 * Some day this will be a full-fledged user tracking system..

 */

extern void sched_dead(struct task_struct *p);

extern void proc_caches_init(void);

extern void flush_signals(struct task_struct *);

extern void ignore_signals(struct task_struct *);

extern void flush_signal_handlers(struct task_struct *, int force_default);

extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);

static inline int kernel_dequeue_signal(siginfo_t *info)

{

	struct task_struct *tsk = current;

	siginfo_t __info;

	int ret;

	spin_lock_irq(&tsk->sighand->siglock);

	ret = dequeue_signal(tsk, &tsk->blocked, info ?: &__info);

	spin_unlock_irq(&tsk->sighand->siglock);

	return ret;

}

static inline void kernel_signal_stop(void)

{

	spin_lock_irq(&current->sighand->siglock);

	if (current->jobctl & JOBCTL_STOP_DEQUEUED)

		__set_current_state(TASK_STOPPED);

	spin_unlock_irq(&current->sighand->siglock);

	schedule();

}

extern void release_task(struct task_struct * p);

extern int send_sig_info(int, struct siginfo *, struct task_struct *);

extern int force_sigsegv(int, struct task_struct *);

extern int force_sig_info(int, struct siginfo *, struct task_struct *);

extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);

extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);

extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,

				const struct cred *, u32);

extern int kill_pgrp(struct pid *pid, int sig, int priv);

extern int kill_pid(struct pid *pid, int sig, int priv);

extern int kill_proc_info(int, struct siginfo *, pid_t);

extern __must_check bool do_notify_parent(struct task_struct *, int);

extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);

extern void force_sig(int, struct task_struct *);

extern int send_sig(int, struct task_struct *, int);

extern int zap_other_threads(struct task_struct *p);

extern struct sigqueue *sigqueue_alloc(void);

extern void sigqueue_free(struct sigqueue *);

extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);

extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);

#ifdef TIF_RESTORE_SIGMASK

/*

 * Legacy restore_sigmask accessors.  These are inefficient on

 * SMP architectures because they require atomic operations.

 */

/**

 * set_restore_sigmask() - make sure saved_sigmask processing gets done

 *

 * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code

 * will run before returning to user mode, to process the flag.  For

 * all callers, TIF_SIGPENDING is already set or it's no harm to set

 * it.  TIF_RESTORE_SIGMASK need not be in the set of bits that the

 * arch code will notice on return to user mode, in case those bits

 * are scarce.  We set TIF_SIGPENDING here to ensure that the arch

 * signal code always gets run when TIF_RESTORE_SIGMASK is set.

 */

static inline void set_restore_sigmask(void)

{

	set_thread_flag(TIF_RESTORE_SIGMASK);

	WARN_ON(!test_thread_flag(TIF_SIGPENDING));

}

static inline void clear_restore_sigmask(void)

{

	clear_thread_flag(TIF_RESTORE_SIGMASK);

}

static inline bool test_restore_sigmask(void)

{

	return test_thread_flag(TIF_RESTORE_SIGMASK);

}

static inline bool test_and_clear_restore_sigmask(void)

{

	return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);

}

#else	/* TIF_RESTORE_SIGMASK */

/* Higher-quality implementation, used if TIF_RESTORE_SIGMASK doesn't exist. */

static inline void set_restore_sigmask(void)

{

	current->restore_sigmask = true;

	WARN_ON(!test_thread_flag(TIF_SIGPENDING));

}

static inline void clear_restore_sigmask(void)

{

	current->restore_sigmask = false;

}

static inline bool test_restore_sigmask(void)

{

	return current->restore_sigmask;

}

static inline bool test_and_clear_restore_sigmask(void)

{

	if (!current->restore_sigmask)

		return false;

	current->restore_sigmask = false;

	return true;

}

#endif

static inline void restore_saved_sigmask(void)

{

	if (test_and_clear_restore_sigmask())

		__set_current_blocked(&current->saved_sigmask);

}

static inline sigset_t *sigmask_to_save(void)

{

	sigset_t *res = &current->blocked;

	if (unlikely(test_restore_sigmask()))

		res = &current->saved_sigmask;

	return res;

}

static inline int kill_cad_pid(int sig, int priv)

{

	return kill_pid(cad_pid, sig, priv);

}

/* These can be the second arg to send_sig_info/send_group_sig_info.  */

#define SEND_SIG_NOINFO ((struct siginfo *) 0)

#define SEND_SIG_PRIV	((struct siginfo *) 1)

#define SEND_SIG_FORCED	((struct siginfo *) 2)

/*

 * True if we are on the alternate signal stack.

 */

static inline int on_sig_stack(unsigned long sp)

{

	/*

	 * If the signal stack is SS_AUTODISARM then, by construction, we

	 * can't be on the signal stack unless user code deliberately set

	 * SS_AUTODISARM when we were already on it.

	 *

	 * This improves reliability: if user state gets corrupted such that

	 * the stack pointer points very close to the end of the signal stack,

	 * then this check will enable the signal to be handled anyway.

	 */

	if (current->sas_ss_flags & SS_AUTODISARM)

		return 0;

#ifdef CONFIG_STACK_GROWSUP

	return sp >= current->sas_ss_sp &&

		sp - current->sas_ss_sp < current->sas_ss_size;

#else

	return sp > current->sas_ss_sp &&

		sp - current->sas_ss_sp <= current->sas_ss_size;

#endif

}

static inline int sas_ss_flags(unsigned long sp)

{

	if (!current->sas_ss_size)

		return SS_DISABLE;

	return on_sig_stack(sp) ? SS_ONSTACK : 0;

}

static inline void sas_ss_reset(struct task_struct *p)

{

	p->sas_ss_sp = 0;

	p->sas_ss_size = 0;

	p->sas_ss_flags = SS_DISABLE;

}

static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)

{

	if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))

#ifdef CONFIG_STACK_GROWSUP

		return current->sas_ss_sp;

#else

		return current->sas_ss_sp + current->sas_ss_size;

#endif

	return sp;

}

#ifdef CONFIG_HAVE_COPY_THREAD_TLS

extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,

#endif

extern void exit_files(struct task_struct *);

extern void __cleanup_sighand(struct sighand_struct *);

extern void exit_itimers(struct signal_struct *);

extern void flush_itimer_signals(void);

extern void do_group_exit(int);

}

#endif

#define tasklist_empty() \

	list_empty(&init_task.tasks)

#define next_task(p) \

	list_entry_rcu((p)->tasks.next, struct task_struct, tasks)

#define for_each_process(p) \

	for (p = &init_task ; (p = next_task(p)) != &init_task ; )

extern bool current_is_single_threaded(void);

/*

 * Careful: do_each_thread/while_each_thread is a double loop so

 *          'break' will not work as expected - use goto instead.

 */

#define do_each_thread(g, t) \

	for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do

#define while_each_thread(g, t) \

	while ((t = next_thread(t)) != g)

#define __for_each_thread(signal, t)	\

	list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)

#define for_each_thread(p, t)		\

	__for_each_thread((p)->signal, t)

/* Careful: this is a double loop, 'break' won't work as expected. */

#define for_each_process_thread(p, t)	\

	for_each_process(p) for_each_thread(p, t)

typedef int (*proc_visitor)(struct task_struct *p, void *data);

void walk_process_tree(struct task_struct *top, proc_visitor, void *);

static inline int get_nr_threads(struct task_struct *tsk)

{

	return tsk->signal->nr_threads;

}

static inline bool thread_group_leader(struct task_struct *p)

{

	return p->exit_signal >= 0;

}

/* Do to the insanities of de_thread it is possible for a process

 * to have the pid of the thread group leader without actually being

 * the thread group leader.  For iteration through the pids in proc

 * all we care about is that we have a task with the appropriate

 * pid, we don't actually care if we have the right task.

 */

static inline bool has_group_leader_pid(struct task_struct *p)

{

	return task_pid(p) == p->signal->leader_pid;

}

static inline

bool same_thread_group(struct task_struct *p1, struct task_struct *p2)

{

	return p1->signal == p2->signal;

}

static inline struct task_struct *next_thread(const struct task_struct *p)

{

	return list_entry_rcu(p->thread_group.next,

			      struct task_struct, thread_group);

}

static inline int thread_group_empty(struct task_struct *p)

{

	return list_empty(&p->thread_group);

}

#define delay_group_leader(p) \

		(thread_group_leader(p) && !thread_group_empty(p))

/*

 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring

 * subscriptions and synchronises with wait4().  Also used in procfs.  Also

	spin_unlock(&p->alloc_lock);

}

extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,

							unsigned long *flags);

static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,

						       unsigned long *flags)

{

	struct sighand_struct *ret;

	ret = __lock_task_sighand(tsk, flags);

	(void)__cond_lock(&tsk->sighand->siglock, ret);

	return ret;

}

static inline void unlock_task_sighand(struct task_struct *tsk,

						unsigned long *flags)

{

	spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);

}

#ifdef CONFIG_THREAD_INFO_IN_TASK

static inline struct thread_info *task_thread_info(struct task_struct *task)

}

#endif /* CONFIG_MEMCG */

static inline unsigned long task_rlimit(const struct task_struct *tsk,

		unsigned int limit)

{

	return READ_ONCE(tsk->signal->rlim[limit].rlim_cur);

}

static inline unsigned long task_rlimit_max(const struct task_struct *tsk,

		unsigned int limit)

{

	return READ_ONCE(tsk->signal->rlim[limit].rlim_max);

}

static inline unsigned long rlimit(unsigned int limit)

{

	return task_rlimit(current, limit);

}

static inline unsigned long rlimit_max(unsigned int limit)

{

	return task_rlimit_max(current, limit);

}

#define SCHED_CPUFREQ_RT	(1U << 0)

#define SCHED_CPUFREQ_DL	(1U << 1)

#define SCHED_CPUFREQ_IOWAIT	(1U << 2)