[linux.git] / fs / proc / array.c

/*
 *  linux/fs/proc/array.c
 *
 *  Copyright (C) 1992  by Linus Torvalds
 *  based on ideas by Darren Senn
 *
 * Fixes:
 * Michael. K. Johnson: stat,statm extensions.
 *                      <[email protected]>
 *
 * Pauline Middelink :  Made cmdline,envline only break at '\0's, to
 *                      make sure SET_PROCTITLE works. Also removed
 *                      bad '!' which forced address recalculation for
 *                      EVERY character on the current page.
 *                      <[email protected]>
 *
 * Danny ter Haar    :	added cpuinfo
 *			<[email protected]>
 *
 * Alessandro Rubini :  profile extension.
 *                      <[email protected]>
 *
 * Jeff Tranter      :  added BogoMips field to cpuinfo
 *                      <[email protected]>
 *
 * Bruno Haible      :  remove 4K limit for the maps file
 *			<[email protected]>
 *
 * Yves Arrouye      :  remove removal of trailing spaces in get_array.
 *			<[email protected]>
 *
 * Jerome Forissier  :  added per-CPU time information to /proc/stat
 *                      and /proc/<pid>/cpu extension
 *                      <[email protected]>
 *			- Incorporation and non-SMP safe operation
 *			of forissier patch in 2.1.78 by
 *			Hans Marcus <[email protected]>
 *
 * [email protected]        :  /proc/partitions
 *
 *
 * Alan Cox	     :  security fixes.
 *			<[email protected]>
 *
 * Al Viro           :  safe handling of mm_struct
 *
 * Gerhard Wichert   :  added BIGMEM support
 * Siemens AG           <[email protected]>
 *
 * Al Viro & Jeff Garzik :  moved most of the thing into base.c and
 *			 :  proc_misc.c. The rest may eventually go into
 *			 :  base.c too.
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/tty.h>
#include <linux/string.h>
#include <linux/mman.h>
#include <linux/proc_fs.h>
#include <linux/ioport.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/hugetlb.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/signal.h>
#include <linux/highmem.h>
#include <linux/file.h>
#include <linux/fdtable.h>
#include <linux/times.h>
#include <linux/cpuset.h>
#include <linux/rcupdate.h>
#include <linux/delayacct.h>
#include <linux/seq_file.h>
#include <linux/pid_namespace.h>
#include <linux/ptrace.h>
#include <linux/tracehook.h>
#include <linux/user_namespace.h>

#include <asm/pgtable.h>
#include <asm/processor.h>
#include "internal.h"

static inline void task_name(struct seq_file *m, struct task_struct *p)
{
	int i;
	char *buf, *end;
	char *name;
	char tcomm[sizeof(p->comm)];

	get_task_comm(tcomm, p);

	seq_puts(m, "Name:\t");
	end = m->buf + m->size;
	buf = m->buf + m->count;
	name = tcomm;
	i = sizeof(tcomm);
	while (i && (buf < end)) {
		unsigned char c = *name;
		name++;
		i--;
		*buf = c;
		if (!c)
			break;
		if (c == '\\') {
			buf++;
			if (buf < end)
				*buf++ = c;
			continue;
		}
		if (c == '\n') {
			*buf++ = '\\';
			if (buf < end)
				*buf++ = 'n';
			continue;
		}
		buf++;
	}
	m->count = buf - m->buf;
	seq_putc(m, '\n');
}

/*
 * The task state array is a strange "bitmap" of
 * reasons to sleep. Thus "running" is zero, and
 * you can test for combinations of others with
 * simple bit tests.
 */
static const char * const task_state_array[] = {
	"R (running)",		/*   0 */
	"S (sleeping)",		/*   1 */
	"D (disk sleep)",	/*   2 */
	"T (stopped)",		/*   4 */
	"t (tracing stop)",	/*   8 */
	"Z (zombie)",		/*  16 */
	"X (dead)",		/*  32 */
	"x (dead)",		/*  64 */
	"K (wakekill)",		/* 128 */
	"W (waking)",		/* 256 */
};

static inline const char *get_task_state(struct task_struct *tsk)
{
	unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
	const char * const *p = &task_state_array[0];

	BUILD_BUG_ON(1 + ilog2(TASK_STATE_MAX) != ARRAY_SIZE(task_state_array));

	while (state) {
		p++;
		state >>= 1;
	}
	return *p;
}

static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
				struct pid *pid, struct task_struct *p)
{
	struct user_namespace *user_ns = current_user_ns();
	struct group_info *group_info;
	int g;
	struct fdtable *fdt = NULL;
	const struct cred *cred;
	pid_t ppid, tpid;

	rcu_read_lock();
	ppid = pid_alive(p) ?
		task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
	tpid = 0;
	if (pid_alive(p)) {
		struct task_struct *tracer = ptrace_parent(p);
		if (tracer)
			tpid = task_pid_nr_ns(tracer, ns);
	}
	cred = get_task_cred(p);
	seq_printf(m,
		"State:\t%s\n"
		"Tgid:\t%d\n"
		"Pid:\t%d\n"
		"PPid:\t%d\n"
		"TracerPid:\t%d\n"
		"Uid:\t%d\t%d\t%d\t%d\n"
		"Gid:\t%d\t%d\t%d\t%d\n",
		get_task_state(p),
		task_tgid_nr_ns(p, ns),
		pid_nr_ns(pid, ns),
		ppid, tpid,
		from_kuid_munged(user_ns, cred->uid),
		from_kuid_munged(user_ns, cred->euid),
		from_kuid_munged(user_ns, cred->suid),
		from_kuid_munged(user_ns, cred->fsuid),
		from_kgid_munged(user_ns, cred->gid),
		from_kgid_munged(user_ns, cred->egid),
		from_kgid_munged(user_ns, cred->sgid),
		from_kgid_munged(user_ns, cred->fsgid));

	task_lock(p);
	if (p->files)
		fdt = files_fdtable(p->files);
	seq_printf(m,
		"FDSize:\t%d\n"
		"Groups:\t",
		fdt ? fdt->max_fds : 0);
	rcu_read_unlock();

	group_info = cred->group_info;
	task_unlock(p);

	for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
		seq_printf(m, "%d ",
			   from_kgid_munged(user_ns, GROUP_AT(group_info, g)));
	put_cred(cred);

	seq_putc(m, '\n');
}

static void render_sigset_t(struct seq_file *m, const char *header,
				sigset_t *set)
{
	int i;

	seq_puts(m, header);

	i = _NSIG;
	do {
		int x = 0;

		i -= 4;
		if (sigismember(set, i+1)) x |= 1;
		if (sigismember(set, i+2)) x |= 2;
		if (sigismember(set, i+3)) x |= 4;
		if (sigismember(set, i+4)) x |= 8;
		seq_printf(m, "%x", x);
	} while (i >= 4);

	seq_putc(m, '\n');
}

static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
				    sigset_t *catch)
{
	struct k_sigaction *k;
	int i;

	k = p->sighand->action;
	for (i = 1; i <= _NSIG; ++i, ++k) {
		if (k->sa.sa_handler == SIG_IGN)
			sigaddset(ign, i);
		else if (k->sa.sa_handler != SIG_DFL)
			sigaddset(catch, i);
	}
}

static inline void task_sig(struct seq_file *m, struct task_struct *p)
{
	unsigned long flags;
	sigset_t pending, shpending, blocked, ignored, caught;
	int num_threads = 0;
	unsigned long qsize = 0;
	unsigned long qlim = 0;

	sigemptyset(&pending);
	sigemptyset(&shpending);
	sigemptyset(&blocked);
	sigemptyset(&ignored);
	sigemptyset(&caught);

	if (lock_task_sighand(p, &flags)) {
		pending = p->pending.signal;
		shpending = p->signal->shared_pending.signal;
		blocked = p->blocked;
		collect_sigign_sigcatch(p, &ignored, &caught);
		num_threads = get_nr_threads(p);
		rcu_read_lock();  /* FIXME: is this correct? */
		qsize = atomic_read(&__task_cred(p)->user->sigpending);
		rcu_read_unlock();
		qlim = task_rlimit(p, RLIMIT_SIGPENDING);
		unlock_task_sighand(p, &flags);
	}

	seq_printf(m, "Threads:\t%d\n", num_threads);
	seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);

	/* render them all */
	render_sigset_t(m, "SigPnd:\t", &pending);
	render_sigset_t(m, "ShdPnd:\t", &shpending);
	render_sigset_t(m, "SigBlk:\t", &blocked);
	render_sigset_t(m, "SigIgn:\t", &ignored);
	render_sigset_t(m, "SigCgt:\t", &caught);
}

static void render_cap_t(struct seq_file *m, const char *header,
			kernel_cap_t *a)
{
	unsigned __capi;

	seq_puts(m, header);
	CAP_FOR_EACH_U32(__capi) {
		seq_printf(m, "%08x",
			   a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
	}
	seq_putc(m, '\n');
}

static inline void task_cap(struct seq_file *m, struct task_struct *p)
{
	const struct cred *cred;
	kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;

	rcu_read_lock();
	cred = __task_cred(p);
	cap_inheritable	= cred->cap_inheritable;
	cap_permitted	= cred->cap_permitted;
	cap_effective	= cred->cap_effective;
	cap_bset	= cred->cap_bset;
	rcu_read_unlock();

	render_cap_t(m, "CapInh:\t", &cap_inheritable);
	render_cap_t(m, "CapPrm:\t", &cap_permitted);
	render_cap_t(m, "CapEff:\t", &cap_effective);
	render_cap_t(m, "CapBnd:\t", &cap_bset);
}

static inline void task_context_switch_counts(struct seq_file *m,
						struct task_struct *p)
{
	seq_printf(m,	"voluntary_ctxt_switches:\t%lu\n"
			"nonvoluntary_ctxt_switches:\t%lu\n",
			p->nvcsw,
			p->nivcsw);
}

static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
{
	seq_puts(m, "Cpus_allowed:\t");
	seq_cpumask(m, &task->cpus_allowed);
	seq_putc(m, '\n');
	seq_puts(m, "Cpus_allowed_list:\t");
	seq_cpumask_list(m, &task->cpus_allowed);
	seq_putc(m, '\n');
}

int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
			struct pid *pid, struct task_struct *task)
{
	struct mm_struct *mm = get_task_mm(task);

	task_name(m, task);
	task_state(m, ns, pid, task);

	if (mm) {
		task_mem(m, mm);
		mmput(mm);
	}
	task_sig(m, task);
	task_cap(m, task);
	task_cpus_allowed(m, task);
	cpuset_task_status_allowed(m, task);
	task_context_switch_counts(m, task);
	return 0;
}

static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
			struct pid *pid, struct task_struct *task, int whole)
{
	unsigned long vsize, eip, esp, wchan = ~0UL;
	int priority, nice;
	int tty_pgrp = -1, tty_nr = 0;
	sigset_t sigign, sigcatch;
	char state;
	pid_t ppid = 0, pgid = -1, sid = -1;
	int num_threads = 0;
	int permitted;
	struct mm_struct *mm;
	unsigned long long start_time;
	unsigned long cmin_flt = 0, cmaj_flt = 0;
	unsigned long  min_flt = 0,  maj_flt = 0;
	cputime_t cutime, cstime, utime, stime;
	cputime_t cgtime, gtime;
	unsigned long rsslim = 0;
	char tcomm[sizeof(task->comm)];
	unsigned long flags;

	state = *get_task_state(task);
	vsize = eip = esp = 0;
	permitted = ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_NOAUDIT);
	mm = get_task_mm(task);
	if (mm) {
		vsize = task_vsize(mm);
		if (permitted) {
			eip = KSTK_EIP(task);
			esp = KSTK_ESP(task);
		}
	}

	get_task_comm(tcomm, task);

	sigemptyset(&sigign);
	sigemptyset(&sigcatch);
	cutime = cstime = utime = stime = 0;
	cgtime = gtime = 0;

	if (lock_task_sighand(task, &flags)) {
		struct signal_struct *sig = task->signal;

		if (sig->tty) {
			struct pid *pgrp = tty_get_pgrp(sig->tty);
			tty_pgrp = pid_nr_ns(pgrp, ns);
			put_pid(pgrp);
			tty_nr = new_encode_dev(tty_devnum(sig->tty));
		}

		num_threads = get_nr_threads(task);
		collect_sigign_sigcatch(task, &sigign, &sigcatch);

		cmin_flt = sig->cmin_flt;
		cmaj_flt = sig->cmaj_flt;
		cutime = sig->cutime;
		cstime = sig->cstime;
		cgtime = sig->cgtime;
		rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);

		/* add up live thread stats at the group level */
		if (whole) {
			struct task_struct *t = task;
			do {
				min_flt += t->min_flt;
				maj_flt += t->maj_flt;
				gtime += t->gtime;
				t = next_thread(t);
			} while (t != task);

			min_flt += sig->min_flt;
			maj_flt += sig->maj_flt;
			thread_group_times(task, &utime, &stime);
			gtime += sig->gtime;
		}

		sid = task_session_nr_ns(task, ns);
		ppid = task_tgid_nr_ns(task->real_parent, ns);
		pgid = task_pgrp_nr_ns(task, ns);

		unlock_task_sighand(task, &flags);
	}

	if (permitted && (!whole || num_threads < 2))
		wchan = get_wchan(task);
	if (!whole) {
		min_flt = task->min_flt;
		maj_flt = task->maj_flt;
		task_times(task, &utime, &stime);
		gtime = task->gtime;
	}

	/* scale priority and nice values from timeslices to -20..20 */
	/* to make it look like a "normal" Unix priority/nice value  */
	priority = task_prio(task);
	nice = task_nice(task);

	/* Temporary variable needed for gcc-2.96 */
	/* convert timespec -> nsec*/
	start_time =
		(unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
				+ task->real_start_time.tv_nsec;
	/* convert nsec -> ticks */
	start_time = nsec_to_clock_t(start_time);

	seq_printf(m, "%d (%s) %c", pid_nr_ns(pid, ns), tcomm, state);
	seq_put_decimal_ll(m, ' ', ppid);
	seq_put_decimal_ll(m, ' ', pgid);
	seq_put_decimal_ll(m, ' ', sid);
	seq_put_decimal_ll(m, ' ', tty_nr);
	seq_put_decimal_ll(m, ' ', tty_pgrp);
	seq_put_decimal_ull(m, ' ', task->flags);
	seq_put_decimal_ull(m, ' ', min_flt);
	seq_put_decimal_ull(m, ' ', cmin_flt);
	seq_put_decimal_ull(m, ' ', maj_flt);
	seq_put_decimal_ull(m, ' ', cmaj_flt);
	seq_put_decimal_ull(m, ' ', cputime_to_clock_t(utime));
	seq_put_decimal_ull(m, ' ', cputime_to_clock_t(stime));
	seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cutime));
	seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cstime));
	seq_put_decimal_ll(m, ' ', priority);
	seq_put_decimal_ll(m, ' ', nice);
	seq_put_decimal_ll(m, ' ', num_threads);
	seq_put_decimal_ull(m, ' ', 0);
	seq_put_decimal_ull(m, ' ', start_time);
	seq_put_decimal_ull(m, ' ', vsize);
	seq_put_decimal_ull(m, ' ', mm ? get_mm_rss(mm) : 0);
	seq_put_decimal_ull(m, ' ', rsslim);
	seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->start_code : 1) : 0);
	seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->end_code : 1) : 0);
	seq_put_decimal_ull(m, ' ', (permitted && mm) ? mm->start_stack : 0);
	seq_put_decimal_ull(m, ' ', esp);
	seq_put_decimal_ull(m, ' ', eip);
	/* The signal information here is obsolete.
	 * It must be decimal for Linux 2.0 compatibility.
	 * Use /proc/#/status for real-time signals.
	 */
	seq_put_decimal_ull(m, ' ', task->pending.signal.sig[0] & 0x7fffffffUL);
	seq_put_decimal_ull(m, ' ', task->blocked.sig[0] & 0x7fffffffUL);
	seq_put_decimal_ull(m, ' ', sigign.sig[0] & 0x7fffffffUL);
	seq_put_decimal_ull(m, ' ', sigcatch.sig[0] & 0x7fffffffUL);
	seq_put_decimal_ull(m, ' ', wchan);
	seq_put_decimal_ull(m, ' ', 0);
	seq_put_decimal_ull(m, ' ', 0);
	seq_put_decimal_ll(m, ' ', task->exit_signal);
	seq_put_decimal_ll(m, ' ', task_cpu(task));
	seq_put_decimal_ull(m, ' ', task->rt_priority);
	seq_put_decimal_ull(m, ' ', task->policy);
	seq_put_decimal_ull(m, ' ', delayacct_blkio_ticks(task));
	seq_put_decimal_ull(m, ' ', cputime_to_clock_t(gtime));
	seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cgtime));
	seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->start_data : 0);
	seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->end_data : 0);
	seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->start_brk : 0);
	seq_putc(m, '\n');
	if (mm)
		mmput(mm);
	return 0;
}

int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
			struct pid *pid, struct task_struct *task)
{
	return do_task_stat(m, ns, pid, task, 0);
}

int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
			struct pid *pid, struct task_struct *task)
{
	return do_task_stat(m, ns, pid, task, 1);
}

int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
			struct pid *pid, struct task_struct *task)
{
	unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0;
	struct mm_struct *mm = get_task_mm(task);

	if (mm) {
		size = task_statm(mm, &shared, &text, &data, &resident);
		mmput(mm);
	}
	/*
	 * For quick read, open code by putting numbers directly
	 * expected format is
	 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
	 *               size, resident, shared, text, data);
	 */
	seq_put_decimal_ull(m, 0, size);
	seq_put_decimal_ull(m, ' ', resident);
	seq_put_decimal_ull(m, ' ', shared);
	seq_put_decimal_ull(m, ' ', text);
	seq_put_decimal_ull(m, ' ', 0);
	seq_put_decimal_ull(m, ' ', data);
	seq_put_decimal_ull(m, ' ', 0);
	seq_putc(m, '\n');

	return 0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/proc/array.c
	3	*
	4	* Copyright (C) 1992 by Linus Torvalds
	5	* based on ideas by Darren Senn
	6	*
	7	* Fixes:
	8	* Michael. K. Johnson: stat,statm extensions.
	9	* <[email protected]>
	10	*
	11	* Pauline Middelink : Made cmdline,envline only break at '\0's, to
	12	* make sure SET_PROCTITLE works. Also removed
	13	* bad '!' which forced address recalculation for
	14	* EVERY character on the current page.
	15	* <[email protected]>
	16	*
	17	* Danny ter Haar : added cpuinfo
	18	* <[email protected]>
	19	*
	20	* Alessandro Rubini : profile extension.
	21	* <[email protected]>
	22	*
	23	* Jeff Tranter : added BogoMips field to cpuinfo
	24	* <[email protected]>
	25	*
	26	* Bruno Haible : remove 4K limit for the maps file
	27	* <[email protected]>
	28	*
	29	* Yves Arrouye : remove removal of trailing spaces in get_array.
	30	* <[email protected]>
	31	*
	32	* Jerome Forissier : added per-CPU time information to /proc/stat
	33	* and /proc/<pid>/cpu extension
	34	* <[email protected]>
	35	* - Incorporation and non-SMP safe operation
	36	* of forissier patch in 2.1.78 by
	37	* Hans Marcus <[email protected]>
	38	*
	39	* [email protected] : /proc/partitions
	40	*
	41	*
	42	* Alan Cox : security fixes.
526719ba	43	* <[email protected]>
1da177e4 LT	44	*
	45	* Al Viro : safe handling of mm_struct
	46	*
	47	* Gerhard Wichert : added BIGMEM support
	48	* Siemens AG <[email protected]>
	49	*
	50	* Al Viro & Jeff Garzik : moved most of the thing into base.c and
	51	* : proc_misc.c. The rest may eventually go into
	52	* : base.c too.
	53	*/
	54
1da177e4 LT	55	#include <linux/types.h>
	56	#include <linux/errno.h>
	57	#include <linux/time.h>
	58	#include <linux/kernel.h>
	59	#include <linux/kernel_stat.h>
	60	#include <linux/tty.h>
	61	#include <linux/string.h>
	62	#include <linux/mman.h>
	63	#include <linux/proc_fs.h>
	64	#include <linux/ioport.h>
8ea02606 IM	65	#include <linux/uaccess.h>
8ea02606 IM	66	#include <linux/io.h>
1da177e4 LT	67	#include <linux/mm.h>
	68	#include <linux/hugetlb.h>
	69	#include <linux/pagemap.h>
	70	#include <linux/swap.h>
1da177e4 LT	71	#include <linux/smp.h>
	72	#include <linux/signal.h>
	73	#include <linux/highmem.h>
	74	#include <linux/file.h>
9f3acc31	75	#include <linux/fdtable.h>
1da177e4 LT	76	#include <linux/times.h>
1da177e4 LT	77	#include <linux/cpuset.h>
4fb3a538	78	#include <linux/rcupdate.h>
25890454	79	#include <linux/delayacct.h>
ee992744	80	#include <linux/seq_file.h>
b488893a	81	#include <linux/pid_namespace.h>
f83ce3e6	82	#include <linux/ptrace.h>
0d094efe	83	#include <linux/tracehook.h>
ae2975bc	84	#include <linux/user_namespace.h>
1da177e4	85
1da177e4	86	#include <asm/pgtable.h>
1da177e4 LT	87	#include <asm/processor.h>
	88	#include "internal.h"
	89
df5f8314	90	static inline void task_name(struct seq_file m, struct task_struct p)
1da177e4 LT	91	{
1da177e4 LT	92	int i;
df5f8314	93	char buf, end;
8ea02606	94	char *name;
1da177e4 LT	95	char tcomm[sizeof(p->comm)];
	96
	97	get_task_comm(tcomm, p);
	98
9d6de12f	99	seq_puts(m, "Name:\t");
df5f8314 EB	100	end = m->buf + m->size;
df5f8314 EB	101	buf = m->buf + m->count;
1da177e4 LT	102	name = tcomm;
1da177e4 LT	103	i = sizeof(tcomm);
df5f8314	104	while (i && (buf < end)) {
1da177e4 LT	105	unsigned char c = *name;
	106	name++;
	107	i--;
	108	*buf = c;
	109	if (!c)
	110	break;
	111	if (c == '\\') {
df5f8314 EB	112	buf++;
	113	if (buf < end)
	114	*buf++ = c;
1da177e4 LT	115	continue;
	116	}
	117	if (c == '\n') {
df5f8314 EB	118	*buf++ = '\\';
	119	if (buf < end)
	120	*buf++ = 'n';
1da177e4 LT	121	continue;
	122	}
	123	buf++;
df5f8314 EB	124	}
df5f8314 EB	125	m->count = buf - m->buf;
9d6de12f	126	seq_putc(m, '\n');
1da177e4 LT	127	}
	128
	129	/*
	130	* The task state array is a strange "bitmap" of
	131	* reasons to sleep. Thus "running" is zero, and
	132	* you can test for combinations of others with
	133	* simple bit tests.
	134	*/
e130aa70	135	static const char * const task_state_array[] = {
e1781538 PZ	136	"R (running)", /* 0 */
	137	"S (sleeping)", /* 1 */
	138	"D (disk sleep)", /* 2 */
	139	"T (stopped)", /* 4 */
	140	"t (tracing stop)", /* 8 */
	141	"Z (zombie)", /* 16 */
	142	"X (dead)", /* 32 */
	143	"x (dead)", /* 64 */
464763cf PZ	144	"K (wakekill)", /* 128 */
464763cf PZ	145	"W (waking)", /* 256 */
1da177e4 LT	146	};
1da177e4 LT	147
8ea02606	148	static inline const char get_task_state(struct task_struct tsk)
1da177e4	149	{
1587e2b1	150	unsigned int state = (tsk->state & TASK_REPORT) \| tsk->exit_state;
e130aa70	151	const char * const *p = &task_state_array[0];
1da177e4	152
e1781538 PZ	153	BUILD_BUG_ON(1 + ilog2(TASK_STATE_MAX) != ARRAY_SIZE(task_state_array));
e1781538 PZ	154
1da177e4 LT	155	while (state) {
	156	p++;
	157	state >>= 1;
	158	}
	159	return *p;
	160	}
	161
df5f8314 EB	162	static inline void task_state(struct seq_file m, struct pid_namespace ns,
df5f8314 EB	163	struct pid pid, struct task_struct p)
1da177e4	164	{
ae2975bc	165	struct user_namespace *user_ns = current_user_ns();
1da177e4 LT	166	struct group_info *group_info;
1da177e4 LT	167	int g;
badf1662	168	struct fdtable *fdt = NULL;
c69e8d9c	169	const struct cred *cred;
b488893a	170	pid_t ppid, tpid;
1da177e4	171
b0fa9db6	172	rcu_read_lock();
b488893a PE	173	ppid = pid_alive(p) ?
b488893a PE	174	task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
0d094efe RM	175	tpid = 0;
0d094efe RM	176	if (pid_alive(p)) {
06d98473	177	struct task_struct *tracer = ptrace_parent(p);
0d094efe RM	178	if (tracer)
	179	tpid = task_pid_nr_ns(tracer, ns);
	180	}
de09a977	181	cred = get_task_cred(p);
df5f8314	182	seq_printf(m,
1da177e4	183	"State:\t%s\n"
1da177e4 LT	184	"Tgid:\t%d\n"
	185	"Pid:\t%d\n"
	186	"PPid:\t%d\n"
	187	"TracerPid:\t%d\n"
	188	"Uid:\t%d\t%d\t%d\t%d\n"
	189	"Gid:\t%d\t%d\t%d\t%d\n",
	190	get_task_state(p),
b488893a	191	task_tgid_nr_ns(p, ns),
df5f8314	192	pid_nr_ns(pid, ns),
b488893a	193	ppid, tpid,
dcb0f222 EB	194	from_kuid_munged(user_ns, cred->uid),
	195	from_kuid_munged(user_ns, cred->euid),
	196	from_kuid_munged(user_ns, cred->suid),
	197	from_kuid_munged(user_ns, cred->fsuid),
	198	from_kgid_munged(user_ns, cred->gid),
	199	from_kgid_munged(user_ns, cred->egid),
	200	from_kgid_munged(user_ns, cred->sgid),
	201	from_kgid_munged(user_ns, cred->fsgid));
b0fa9db6	202
1da177e4	203	task_lock(p);
badf1662 DS	204	if (p->files)
badf1662 DS	205	fdt = files_fdtable(p->files);
df5f8314	206	seq_printf(m,
1da177e4 LT	207	"FDSize:\t%d\n"
1da177e4 LT	208	"Groups:\t",
badf1662	209	fdt ? fdt->max_fds : 0);
4fb3a538	210	rcu_read_unlock();
1da177e4	211
c69e8d9c	212	group_info = cred->group_info;
1da177e4 LT	213	task_unlock(p);
1da177e4 LT	214
8ea02606	215	for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
ae2975bc EB	216	seq_printf(m, "%d ",
ae2975bc EB	217	from_kgid_munged(user_ns, GROUP_AT(group_info, g)));
c69e8d9c	218	put_cred(cred);
1da177e4	219
9d6de12f	220	seq_putc(m, '\n');
1da177e4 LT	221	}
1da177e4 LT	222
df5f8314 EB	223	static void render_sigset_t(struct seq_file m, const char header,
df5f8314 EB	224	sigset_t *set)
1da177e4	225	{
df5f8314	226	int i;
1da177e4	227
9d6de12f	228	seq_puts(m, header);
1da177e4 LT	229
	230	i = _NSIG;
	231	do {
	232	int x = 0;
	233
	234	i -= 4;
	235	if (sigismember(set, i+1)) x \|= 1;
	236	if (sigismember(set, i+2)) x \|= 2;
	237	if (sigismember(set, i+3)) x \|= 4;
	238	if (sigismember(set, i+4)) x \|= 8;
df5f8314	239	seq_printf(m, "%x", x);
1da177e4 LT	240	} while (i >= 4);
1da177e4 LT	241
9d6de12f	242	seq_putc(m, '\n');
1da177e4 LT	243	}
	244
	245	static void collect_sigign_sigcatch(struct task_struct p, sigset_t ign,
	246	sigset_t *catch)
	247	{
	248	struct k_sigaction *k;
	249	int i;
	250
	251	k = p->sighand->action;
	252	for (i = 1; i <= _NSIG; ++i, ++k) {
	253	if (k->sa.sa_handler == SIG_IGN)
	254	sigaddset(ign, i);
	255	else if (k->sa.sa_handler != SIG_DFL)
	256	sigaddset(catch, i);
	257	}
	258	}
	259
df5f8314	260	static inline void task_sig(struct seq_file m, struct task_struct p)
1da177e4	261	{
5e6b3f42	262	unsigned long flags;
1da177e4 LT	263	sigset_t pending, shpending, blocked, ignored, caught;
	264	int num_threads = 0;
	265	unsigned long qsize = 0;
	266	unsigned long qlim = 0;
	267
	268	sigemptyset(&pending);
	269	sigemptyset(&shpending);
	270	sigemptyset(&blocked);
	271	sigemptyset(&ignored);
	272	sigemptyset(&caught);
	273
5e6b3f42	274	if (lock_task_sighand(p, &flags)) {
1da177e4 LT	275	pending = p->pending.signal;
	276	shpending = p->signal->shared_pending.signal;
	277	blocked = p->blocked;
	278	collect_sigign_sigcatch(p, &ignored, &caught);
7e49827c	279	num_threads = get_nr_threads(p);
7dc52157	280	rcu_read_lock(); /* FIXME: is this correct? */
c69e8d9c	281	qsize = atomic_read(&__task_cred(p)->user->sigpending);
7dc52157	282	rcu_read_unlock();
d554ed89	283	qlim = task_rlimit(p, RLIMIT_SIGPENDING);
5e6b3f42	284	unlock_task_sighand(p, &flags);
1da177e4	285	}
1da177e4	286
df5f8314 EB	287	seq_printf(m, "Threads:\t%d\n", num_threads);
df5f8314 EB	288	seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
1da177e4 LT	289
1da177e4 LT	290	/* render them all */
df5f8314 EB	291	render_sigset_t(m, "SigPnd:\t", &pending);
	292	render_sigset_t(m, "ShdPnd:\t", &shpending);
	293	render_sigset_t(m, "SigBlk:\t", &blocked);
	294	render_sigset_t(m, "SigIgn:\t", &ignored);
	295	render_sigset_t(m, "SigCgt:\t", &caught);
1da177e4 LT	296	}
1da177e4 LT	297
df5f8314 EB	298	static void render_cap_t(struct seq_file m, const char header,
df5f8314 EB	299	kernel_cap_t *a)
e338d263 AM	300	{
	301	unsigned __capi;
	302
9d6de12f	303	seq_puts(m, header);
e338d263	304	CAP_FOR_EACH_U32(__capi) {
df5f8314	305	seq_printf(m, "%08x",
ca05a99a	306	a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
e338d263	307	}
9d6de12f	308	seq_putc(m, '\n');
e338d263 AM	309	}
e338d263 AM	310
df5f8314	311	static inline void task_cap(struct seq_file m, struct task_struct p)
1da177e4	312	{
c69e8d9c DH	313	const struct cred *cred;
c69e8d9c DH	314	kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
b6dff3ec	315
c69e8d9c DH	316	rcu_read_lock();
	317	cred = __task_cred(p);
	318	cap_inheritable = cred->cap_inheritable;
	319	cap_permitted = cred->cap_permitted;
	320	cap_effective = cred->cap_effective;
	321	cap_bset = cred->cap_bset;
	322	rcu_read_unlock();
	323
	324	render_cap_t(m, "CapInh:\t", &cap_inheritable);
	325	render_cap_t(m, "CapPrm:\t", &cap_permitted);
	326	render_cap_t(m, "CapEff:\t", &cap_effective);
	327	render_cap_t(m, "CapBnd:\t", &cap_bset);
1da177e4 LT	328	}
1da177e4 LT	329
df5f8314 EB	330	static inline void task_context_switch_counts(struct seq_file *m,
df5f8314 EB	331	struct task_struct *p)
b663a79c	332	{
df5f8314 EB	333	seq_printf(m, "voluntary_ctxt_switches:\t%lu\n"
	334	"nonvoluntary_ctxt_switches:\t%lu\n",
	335	p->nvcsw,
	336	p->nivcsw);
b663a79c MU	337	}
b663a79c MU	338
d01d4827 HC	339	static void task_cpus_allowed(struct seq_file m, struct task_struct task)
d01d4827 HC	340	{
9d6de12f	341	seq_puts(m, "Cpus_allowed:\t");
d01d4827	342	seq_cpumask(m, &task->cpus_allowed);
9d6de12f AD	343	seq_putc(m, '\n');
9d6de12f AD	344	seq_puts(m, "Cpus_allowed_list:\t");
d01d4827	345	seq_cpumask_list(m, &task->cpus_allowed);
9d6de12f	346	seq_putc(m, '\n');
d01d4827 HC	347	}
d01d4827 HC	348
df5f8314 EB	349	int proc_pid_status(struct seq_file m, struct pid_namespace ns,
df5f8314 EB	350	struct pid pid, struct task_struct task)
1da177e4	351	{
1da177e4 LT	352	struct mm_struct *mm = get_task_mm(task);
1da177e4 LT	353
df5f8314 EB	354	task_name(m, task);
df5f8314 EB	355	task_state(m, ns, pid, task);
8ea02606	356
1da177e4	357	if (mm) {
df5f8314	358	task_mem(m, mm);
1da177e4 LT	359	mmput(mm);
1da177e4 LT	360	}
df5f8314 EB	361	task_sig(m, task);
df5f8314 EB	362	task_cap(m, task);
d01d4827	363	task_cpus_allowed(m, task);
df5f8314	364	cpuset_task_status_allowed(m, task);
df5f8314 EB	365	task_context_switch_counts(m, task);
df5f8314 EB	366	return 0;
1da177e4 LT	367	}
1da177e4 LT	368
ee992744 EB	369	static int do_task_stat(struct seq_file m, struct pid_namespace ns,
ee992744 EB	370	struct pid pid, struct task_struct task, int whole)
1da177e4 LT	371	{
1da177e4 LT	372	unsigned long vsize, eip, esp, wchan = ~0UL;
715be1fc	373	int priority, nice;
1da177e4 LT	374	int tty_pgrp = -1, tty_nr = 0;
	375	sigset_t sigign, sigcatch;
	376	char state;
8ea02606	377	pid_t ppid = 0, pgid = -1, sid = -1;
1da177e4	378	int num_threads = 0;
f83ce3e6	379	int permitted;
1da177e4 LT	380	struct mm_struct *mm;
	381	unsigned long long start_time;
	382	unsigned long cmin_flt = 0, cmaj_flt = 0;
	383	unsigned long min_flt = 0, maj_flt = 0;
efe567fc	384	cputime_t cutime, cstime, utime, stime;
9ac52315	385	cputime_t cgtime, gtime;
1da177e4	386	unsigned long rsslim = 0;
1da177e4	387	char tcomm[sizeof(task->comm)];
a593d6ed	388	unsigned long flags;
1da177e4 LT	389
	390	state = *get_task_state(task);
	391	vsize = eip = esp = 0;
69f594a3	392	permitted = ptrace_may_access(task, PTRACE_MODE_READ \| PTRACE_MODE_NOAUDIT);
1da177e4 LT	393	mm = get_task_mm(task);
	394	if (mm) {
	395	vsize = task_vsize(mm);
f83ce3e6 JE	396	if (permitted) {
	397	eip = KSTK_EIP(task);
	398	esp = KSTK_ESP(task);
	399	}
1da177e4 LT	400	}
	401
	402	get_task_comm(tcomm, task);
	403
	404	sigemptyset(&sigign);
	405	sigemptyset(&sigcatch);
64861634 MS	406	cutime = cstime = utime = stime = 0;
64861634 MS	407	cgtime = gtime = 0;
3cfd0885	408
a593d6ed ON	409	if (lock_task_sighand(task, &flags)) {
a593d6ed ON	410	struct signal_struct *sig = task->signal;
91593504 ON	411
91593504 ON	412	if (sig->tty) {
5d0fdf1e AC	413	struct pid *pgrp = tty_get_pgrp(sig->tty);
	414	tty_pgrp = pid_nr_ns(pgrp, ns);
	415	put_pid(pgrp);
91593504	416	tty_nr = new_encode_dev(tty_devnum(sig->tty));
a593d6ed ON	417	}
a593d6ed ON	418
7e49827c	419	num_threads = get_nr_threads(task);
1da177e4 LT	420	collect_sigign_sigcatch(task, &sigign, &sigcatch);
1da177e4 LT	421
a593d6ed ON	422	cmin_flt = sig->cmin_flt;
	423	cmaj_flt = sig->cmaj_flt;
	424	cutime = sig->cutime;
	425	cstime = sig->cstime;
9ac52315	426	cgtime = sig->cgtime;
d554ed89	427	rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
a593d6ed	428
1da177e4 LT	429	/* add up live thread stats at the group level */
1da177e4 LT	430	if (whole) {
a593d6ed	431	struct task_struct *t = task;
1da177e4 LT	432	do {
	433	min_flt += t->min_flt;
	434	maj_flt += t->maj_flt;
64861634	435	gtime += t->gtime;
1da177e4 LT	436	t = next_thread(t);
1da177e4 LT	437	} while (t != task);
1da177e4	438
a593d6ed ON	439	min_flt += sig->min_flt;
a593d6ed ON	440	maj_flt += sig->maj_flt;
0cf55e1e	441	thread_group_times(task, &utime, &stime);
64861634	442	gtime += sig->gtime;
1da177e4	443	}
a593d6ed	444
b488893a	445	sid = task_session_nr_ns(task, ns);
a98fdcef	446	ppid = task_tgid_nr_ns(task->real_parent, ns);
b488893a	447	pgid = task_pgrp_nr_ns(task, ns);
a593d6ed ON	448
a593d6ed ON	449	unlock_task_sighand(task, &flags);
1da177e4	450	}
1da177e4	451
f83ce3e6	452	if (permitted && (!whole \|\| num_threads < 2))
1da177e4 LT	453	wchan = get_wchan(task);
	454	if (!whole) {
	455	min_flt = task->min_flt;
	456	maj_flt = task->maj_flt;
d180c5bc	457	task_times(task, &utime, &stime);
d5b7c78e	458	gtime = task->gtime;
1da177e4 LT	459	}
	460
	461	/* scale priority and nice values from timeslices to -20..20 */
	462	/* to make it look like a "normal" Unix priority/nice value */
	463	priority = task_prio(task);
	464	nice = task_nice(task);
	465
	466	/* Temporary variable needed for gcc-2.96 */
	467	/* convert timespec -> nsec*/
924b42d5 TJ	468	start_time =
	469	(unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
	470	+ task->real_start_time.tv_nsec;
1da177e4 LT	471	/* convert nsec -> ticks */
	472	start_time = nsec_to_clock_t(start_time);
	473
bda7bad6 KH	474	seq_printf(m, "%d (%s) %c", pid_nr_ns(pid, ns), tcomm, state);
	475	seq_put_decimal_ll(m, ' ', ppid);
	476	seq_put_decimal_ll(m, ' ', pgid);
	477	seq_put_decimal_ll(m, ' ', sid);
	478	seq_put_decimal_ll(m, ' ', tty_nr);
	479	seq_put_decimal_ll(m, ' ', tty_pgrp);
	480	seq_put_decimal_ull(m, ' ', task->flags);
	481	seq_put_decimal_ull(m, ' ', min_flt);
	482	seq_put_decimal_ull(m, ' ', cmin_flt);
	483	seq_put_decimal_ull(m, ' ', maj_flt);
	484	seq_put_decimal_ull(m, ' ', cmaj_flt);
	485	seq_put_decimal_ull(m, ' ', cputime_to_clock_t(utime));
	486	seq_put_decimal_ull(m, ' ', cputime_to_clock_t(stime));
	487	seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cutime));
	488	seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cstime));
	489	seq_put_decimal_ll(m, ' ', priority);
	490	seq_put_decimal_ll(m, ' ', nice);
	491	seq_put_decimal_ll(m, ' ', num_threads);
	492	seq_put_decimal_ull(m, ' ', 0);
	493	seq_put_decimal_ull(m, ' ', start_time);
	494	seq_put_decimal_ull(m, ' ', vsize);
715be1fc	495	seq_put_decimal_ull(m, ' ', mm ? get_mm_rss(mm) : 0);
bda7bad6 KH	496	seq_put_decimal_ull(m, ' ', rsslim);
	497	seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->start_code : 1) : 0);
	498	seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->end_code : 1) : 0);
	499	seq_put_decimal_ull(m, ' ', (permitted && mm) ? mm->start_stack : 0);
	500	seq_put_decimal_ull(m, ' ', esp);
	501	seq_put_decimal_ull(m, ' ', eip);
	502	/* The signal information here is obsolete.
	503	* It must be decimal for Linux 2.0 compatibility.
	504	* Use /proc/#/status for real-time signals.
	505	*/
	506	seq_put_decimal_ull(m, ' ', task->pending.signal.sig[0] & 0x7fffffffUL);
	507	seq_put_decimal_ull(m, ' ', task->blocked.sig[0] & 0x7fffffffUL);
	508	seq_put_decimal_ull(m, ' ', sigign.sig[0] & 0x7fffffffUL);
	509	seq_put_decimal_ull(m, ' ', sigcatch.sig[0] & 0x7fffffffUL);
	510	seq_put_decimal_ull(m, ' ', wchan);
	511	seq_put_decimal_ull(m, ' ', 0);
	512	seq_put_decimal_ull(m, ' ', 0);
	513	seq_put_decimal_ll(m, ' ', task->exit_signal);
	514	seq_put_decimal_ll(m, ' ', task_cpu(task));
	515	seq_put_decimal_ull(m, ' ', task->rt_priority);
	516	seq_put_decimal_ull(m, ' ', task->policy);
	517	seq_put_decimal_ull(m, ' ', delayacct_blkio_ticks(task));
	518	seq_put_decimal_ull(m, ' ', cputime_to_clock_t(gtime));
	519	seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cgtime));
	520	seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->start_data : 0);
	521	seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->end_data : 0);
	522	seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->start_brk : 0);
	523	seq_putc(m, '\n');
8ea02606	524	if (mm)
1da177e4	525	mmput(mm);
ee992744	526	return 0;
1da177e4 LT	527	}
1da177e4 LT	528
ee992744 EB	529	int proc_tid_stat(struct seq_file m, struct pid_namespace ns,
ee992744 EB	530	struct pid pid, struct task_struct task)
1da177e4	531	{
ee992744	532	return do_task_stat(m, ns, pid, task, 0);
1da177e4 LT	533	}
1da177e4 LT	534
ee992744 EB	535	int proc_tgid_stat(struct seq_file m, struct pid_namespace ns,
ee992744 EB	536	struct pid pid, struct task_struct task)
1da177e4	537	{
ee992744	538	return do_task_stat(m, ns, pid, task, 1);
1da177e4 LT	539	}
1da177e4 LT	540
a56d3fc7 EB	541	int proc_pid_statm(struct seq_file m, struct pid_namespace ns,
a56d3fc7 EB	542	struct pid pid, struct task_struct task)
1da177e4	543	{
a2ade7b6	544	unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0;
1da177e4	545	struct mm_struct *mm = get_task_mm(task);
8ea02606	546
1da177e4 LT	547	if (mm) {
	548	size = task_statm(mm, &shared, &text, &data, &resident);
	549	mmput(mm);
	550	}
bda7bad6 KH	551	/*
	552	* For quick read, open code by putting numbers directly
	553	* expected format is
	554	* seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
	555	* size, resident, shared, text, data);
	556	*/
	557	seq_put_decimal_ull(m, 0, size);
	558	seq_put_decimal_ull(m, ' ', resident);
	559	seq_put_decimal_ull(m, ' ', shared);
	560	seq_put_decimal_ull(m, ' ', text);
	561	seq_put_decimal_ull(m, ' ', 0);
3748b2f1	562	seq_put_decimal_ull(m, ' ', data);
bda7bad6 KH	563	seq_put_decimal_ull(m, ' ', 0);
bda7bad6 KH	564	seq_putc(m, '\n');
1da177e4	565
a56d3fc7	566	return 0;
1da177e4	567	}