[deliverable/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.
 *                      <johnsonm@stolaf.edu>
 *
 * 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.
 *                      <middelin@polyware.iaf.nl>
 *
 * Danny ter Haar    :	added cpuinfo
 *			<dth@cistron.nl>
 *
 * Alessandro Rubini :  profile extension.
 *                      <rubini@ipvvis.unipv.it>
 *
 * Jeff Tranter      :  added BogoMips field to cpuinfo
 *                      <Jeff_Tranter@Mitel.COM>
 *
 * Bruno Haible      :  remove 4K limit for the maps file
 *			<haible@ma2s2.mathematik.uni-karlsruhe.de>
 *
 * Yves Arrouye      :  remove removal of trailing spaces in get_array.
 *			<Yves.Arrouye@marin.fdn.fr>
 *
 * Jerome Forissier  :  added per-CPU time information to /proc/stat
 *                      and /proc/<pid>/cpu extension
 *                      <forissier@isia.cma.fr>
 *			- Incorporation and non-SMP safe operation
 *			of forissier patch in 2.1.78 by
 *			Hans Marcus <crowbar@concepts.nl>
 *
 * aeb@cwi.nl        :  /proc/partitions
 *
 *
 * Alan Cox	     :  security fixes.
 *			<alan@lxorguk.ukuu.org.uk>
 *
 * Al Viro           :  safe handling of mm_struct
 *
 * Gerhard Wichert   :  added BIGMEM support
 * Siemens AG           <Gerhard.Wichert@pdb.siemens.de>
 *
 * 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,
		cred->uid, cred->euid, cred->suid, cred->fsuid,
		cred->gid, cred->egid, cred->sgid, 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;
	long 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_ll(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	* <johnsonm@stolaf.edu>
	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	* <middelin@polyware.iaf.nl>
	16	*
	17	* Danny ter Haar : added cpuinfo
	18	* <dth@cistron.nl>
	19	*
	20	* Alessandro Rubini : profile extension.
	21	* <rubini@ipvvis.unipv.it>
	22	*
	23	* Jeff Tranter : added BogoMips field to cpuinfo
	24	* <Jeff_Tranter@Mitel.COM>
	25	*
	26	* Bruno Haible : remove 4K limit for the maps file
	27	* <haible@ma2s2.mathematik.uni-karlsruhe.de>
	28	*
	29	* Yves Arrouye : remove removal of trailing spaces in get_array.
	30	* <Yves.Arrouye@marin.fdn.fr>
	31	*
	32	* Jerome Forissier : added per-CPU time information to /proc/stat
	33	* and /proc/<pid>/cpu extension
	34	* <forissier@isia.cma.fr>
	35	* - Incorporation and non-SMP safe operation
	36	* of forissier patch in 2.1.78 by
	37	* Hans Marcus <crowbar@concepts.nl>
	38	*
	39	* aeb@cwi.nl : /proc/partitions
	40	*
	41	*
	42	* Alan Cox : security fixes.
526719ba	43	* <alan@lxorguk.ukuu.org.uk>
1da177e4 LT	44	*
	45	* Al Viro : safe handling of mm_struct
	46	*
	47	* Gerhard Wichert : added BIGMEM support
	48	* Siemens AG <Gerhard.Wichert@pdb.siemens.de>
	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,
c69e8d9c DH	194	cred->uid, cred->euid, cred->suid, cred->fsuid,
c69e8d9c DH	195	cred->gid, cred->egid, cred->sgid, cred->fsgid);
b0fa9db6	196
1da177e4	197	task_lock(p);
badf1662 DS	198	if (p->files)
badf1662 DS	199	fdt = files_fdtable(p->files);
df5f8314	200	seq_printf(m,
1da177e4 LT	201	"FDSize:\t%d\n"
1da177e4 LT	202	"Groups:\t",
badf1662	203	fdt ? fdt->max_fds : 0);
4fb3a538	204	rcu_read_unlock();
1da177e4	205
c69e8d9c	206	group_info = cred->group_info;
1da177e4 LT	207	task_unlock(p);
1da177e4 LT	208
8ea02606	209	for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
ae2975bc EB	210	seq_printf(m, "%d ",
ae2975bc EB	211	from_kgid_munged(user_ns, GROUP_AT(group_info, g)));
c69e8d9c	212	put_cred(cred);
1da177e4	213
9d6de12f	214	seq_putc(m, '\n');
1da177e4 LT	215	}
1da177e4 LT	216
df5f8314 EB	217	static void render_sigset_t(struct seq_file m, const char header,
df5f8314 EB	218	sigset_t *set)
1da177e4	219	{
df5f8314	220	int i;
1da177e4	221
9d6de12f	222	seq_puts(m, header);
1da177e4 LT	223
	224	i = _NSIG;
	225	do {
	226	int x = 0;
	227
	228	i -= 4;
	229	if (sigismember(set, i+1)) x \|= 1;
	230	if (sigismember(set, i+2)) x \|= 2;
	231	if (sigismember(set, i+3)) x \|= 4;
	232	if (sigismember(set, i+4)) x \|= 8;
df5f8314	233	seq_printf(m, "%x", x);
1da177e4 LT	234	} while (i >= 4);
1da177e4 LT	235
9d6de12f	236	seq_putc(m, '\n');
1da177e4 LT	237	}
	238
	239	static void collect_sigign_sigcatch(struct task_struct p, sigset_t ign,
	240	sigset_t *catch)
	241	{
	242	struct k_sigaction *k;
	243	int i;
	244
	245	k = p->sighand->action;
	246	for (i = 1; i <= _NSIG; ++i, ++k) {
	247	if (k->sa.sa_handler == SIG_IGN)
	248	sigaddset(ign, i);
	249	else if (k->sa.sa_handler != SIG_DFL)
	250	sigaddset(catch, i);
	251	}
	252	}
	253
df5f8314	254	static inline void task_sig(struct seq_file m, struct task_struct p)
1da177e4	255	{
5e6b3f42	256	unsigned long flags;
1da177e4 LT	257	sigset_t pending, shpending, blocked, ignored, caught;
	258	int num_threads = 0;
	259	unsigned long qsize = 0;
	260	unsigned long qlim = 0;
	261
	262	sigemptyset(&pending);
	263	sigemptyset(&shpending);
	264	sigemptyset(&blocked);
	265	sigemptyset(&ignored);
	266	sigemptyset(&caught);
	267
5e6b3f42	268	if (lock_task_sighand(p, &flags)) {
1da177e4 LT	269	pending = p->pending.signal;
	270	shpending = p->signal->shared_pending.signal;
	271	blocked = p->blocked;
	272	collect_sigign_sigcatch(p, &ignored, &caught);
7e49827c	273	num_threads = get_nr_threads(p);
7dc52157	274	rcu_read_lock(); /* FIXME: is this correct? */
c69e8d9c	275	qsize = atomic_read(&__task_cred(p)->user->sigpending);
7dc52157	276	rcu_read_unlock();
d554ed89	277	qlim = task_rlimit(p, RLIMIT_SIGPENDING);
5e6b3f42	278	unlock_task_sighand(p, &flags);
1da177e4	279	}
1da177e4	280
df5f8314 EB	281	seq_printf(m, "Threads:\t%d\n", num_threads);
df5f8314 EB	282	seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
1da177e4 LT	283
1da177e4 LT	284	/* render them all */
df5f8314 EB	285	render_sigset_t(m, "SigPnd:\t", &pending);
	286	render_sigset_t(m, "ShdPnd:\t", &shpending);
	287	render_sigset_t(m, "SigBlk:\t", &blocked);
	288	render_sigset_t(m, "SigIgn:\t", &ignored);
	289	render_sigset_t(m, "SigCgt:\t", &caught);
1da177e4 LT	290	}
1da177e4 LT	291
df5f8314 EB	292	static void render_cap_t(struct seq_file m, const char header,
df5f8314 EB	293	kernel_cap_t *a)
e338d263 AM	294	{
	295	unsigned __capi;
	296
9d6de12f	297	seq_puts(m, header);
e338d263	298	CAP_FOR_EACH_U32(__capi) {
df5f8314	299	seq_printf(m, "%08x",
ca05a99a	300	a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
e338d263	301	}
9d6de12f	302	seq_putc(m, '\n');
e338d263 AM	303	}
e338d263 AM	304
df5f8314	305	static inline void task_cap(struct seq_file m, struct task_struct p)
1da177e4	306	{
c69e8d9c DH	307	const struct cred *cred;
c69e8d9c DH	308	kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
b6dff3ec	309
c69e8d9c DH	310	rcu_read_lock();
	311	cred = __task_cred(p);
	312	cap_inheritable = cred->cap_inheritable;
	313	cap_permitted = cred->cap_permitted;
	314	cap_effective = cred->cap_effective;
	315	cap_bset = cred->cap_bset;
	316	rcu_read_unlock();
	317
	318	render_cap_t(m, "CapInh:\t", &cap_inheritable);
	319	render_cap_t(m, "CapPrm:\t", &cap_permitted);
	320	render_cap_t(m, "CapEff:\t", &cap_effective);
	321	render_cap_t(m, "CapBnd:\t", &cap_bset);
1da177e4 LT	322	}
1da177e4 LT	323
df5f8314 EB	324	static inline void task_context_switch_counts(struct seq_file *m,
df5f8314 EB	325	struct task_struct *p)
b663a79c	326	{
df5f8314 EB	327	seq_printf(m, "voluntary_ctxt_switches:\t%lu\n"
	328	"nonvoluntary_ctxt_switches:\t%lu\n",
	329	p->nvcsw,
	330	p->nivcsw);
b663a79c MU	331	}
b663a79c MU	332
d01d4827 HC	333	static void task_cpus_allowed(struct seq_file m, struct task_struct task)
d01d4827 HC	334	{
9d6de12f	335	seq_puts(m, "Cpus_allowed:\t");
d01d4827	336	seq_cpumask(m, &task->cpus_allowed);
9d6de12f AD	337	seq_putc(m, '\n');
9d6de12f AD	338	seq_puts(m, "Cpus_allowed_list:\t");
d01d4827	339	seq_cpumask_list(m, &task->cpus_allowed);
9d6de12f	340	seq_putc(m, '\n');
d01d4827 HC	341	}
d01d4827 HC	342
df5f8314 EB	343	int proc_pid_status(struct seq_file m, struct pid_namespace ns,
df5f8314 EB	344	struct pid pid, struct task_struct task)
1da177e4	345	{
1da177e4 LT	346	struct mm_struct *mm = get_task_mm(task);
1da177e4 LT	347
df5f8314 EB	348	task_name(m, task);
df5f8314 EB	349	task_state(m, ns, pid, task);
8ea02606	350
1da177e4	351	if (mm) {
df5f8314	352	task_mem(m, mm);
1da177e4 LT	353	mmput(mm);
1da177e4 LT	354	}
df5f8314 EB	355	task_sig(m, task);
df5f8314 EB	356	task_cap(m, task);
d01d4827	357	task_cpus_allowed(m, task);
df5f8314	358	cpuset_task_status_allowed(m, task);
df5f8314 EB	359	task_context_switch_counts(m, task);
df5f8314 EB	360	return 0;
1da177e4 LT	361	}
1da177e4 LT	362
ee992744 EB	363	static int do_task_stat(struct seq_file m, struct pid_namespace ns,
ee992744 EB	364	struct pid pid, struct task_struct task, int whole)
1da177e4 LT	365	{
	366	unsigned long vsize, eip, esp, wchan = ~0UL;
	367	long priority, nice;
	368	int tty_pgrp = -1, tty_nr = 0;
	369	sigset_t sigign, sigcatch;
	370	char state;
8ea02606	371	pid_t ppid = 0, pgid = -1, sid = -1;
1da177e4	372	int num_threads = 0;
f83ce3e6	373	int permitted;
1da177e4 LT	374	struct mm_struct *mm;
	375	unsigned long long start_time;
	376	unsigned long cmin_flt = 0, cmaj_flt = 0;
	377	unsigned long min_flt = 0, maj_flt = 0;
efe567fc	378	cputime_t cutime, cstime, utime, stime;
9ac52315	379	cputime_t cgtime, gtime;
1da177e4	380	unsigned long rsslim = 0;
1da177e4	381	char tcomm[sizeof(task->comm)];
a593d6ed	382	unsigned long flags;
1da177e4 LT	383
	384	state = *get_task_state(task);
	385	vsize = eip = esp = 0;
69f594a3	386	permitted = ptrace_may_access(task, PTRACE_MODE_READ \| PTRACE_MODE_NOAUDIT);
1da177e4 LT	387	mm = get_task_mm(task);
	388	if (mm) {
	389	vsize = task_vsize(mm);
f83ce3e6 JE	390	if (permitted) {
	391	eip = KSTK_EIP(task);
	392	esp = KSTK_ESP(task);
	393	}
1da177e4 LT	394	}
	395
	396	get_task_comm(tcomm, task);
	397
	398	sigemptyset(&sigign);
	399	sigemptyset(&sigcatch);
64861634 MS	400	cutime = cstime = utime = stime = 0;
64861634 MS	401	cgtime = gtime = 0;
3cfd0885	402
a593d6ed ON	403	if (lock_task_sighand(task, &flags)) {
a593d6ed ON	404	struct signal_struct *sig = task->signal;
91593504 ON	405
91593504 ON	406	if (sig->tty) {
5d0fdf1e AC	407	struct pid *pgrp = tty_get_pgrp(sig->tty);
	408	tty_pgrp = pid_nr_ns(pgrp, ns);
	409	put_pid(pgrp);
91593504	410	tty_nr = new_encode_dev(tty_devnum(sig->tty));
a593d6ed ON	411	}
a593d6ed ON	412
7e49827c	413	num_threads = get_nr_threads(task);
1da177e4 LT	414	collect_sigign_sigcatch(task, &sigign, &sigcatch);
1da177e4 LT	415
a593d6ed ON	416	cmin_flt = sig->cmin_flt;
	417	cmaj_flt = sig->cmaj_flt;
	418	cutime = sig->cutime;
	419	cstime = sig->cstime;
9ac52315	420	cgtime = sig->cgtime;
d554ed89	421	rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
a593d6ed	422
1da177e4 LT	423	/* add up live thread stats at the group level */
1da177e4 LT	424	if (whole) {
a593d6ed	425	struct task_struct *t = task;
1da177e4 LT	426	do {
	427	min_flt += t->min_flt;
	428	maj_flt += t->maj_flt;
64861634	429	gtime += t->gtime;
1da177e4 LT	430	t = next_thread(t);
1da177e4 LT	431	} while (t != task);
1da177e4	432
a593d6ed ON	433	min_flt += sig->min_flt;
a593d6ed ON	434	maj_flt += sig->maj_flt;
0cf55e1e	435	thread_group_times(task, &utime, &stime);
64861634	436	gtime += sig->gtime;
1da177e4	437	}
a593d6ed	438
b488893a	439	sid = task_session_nr_ns(task, ns);
a98fdcef	440	ppid = task_tgid_nr_ns(task->real_parent, ns);
b488893a	441	pgid = task_pgrp_nr_ns(task, ns);
a593d6ed ON	442
a593d6ed ON	443	unlock_task_sighand(task, &flags);
1da177e4	444	}
1da177e4	445
f83ce3e6	446	if (permitted && (!whole \|\| num_threads < 2))
1da177e4 LT	447	wchan = get_wchan(task);
	448	if (!whole) {
	449	min_flt = task->min_flt;
	450	maj_flt = task->maj_flt;
d180c5bc	451	task_times(task, &utime, &stime);
d5b7c78e	452	gtime = task->gtime;
1da177e4 LT	453	}
	454
	455	/* scale priority and nice values from timeslices to -20..20 */
	456	/* to make it look like a "normal" Unix priority/nice value */
	457	priority = task_prio(task);
	458	nice = task_nice(task);
	459
	460	/* Temporary variable needed for gcc-2.96 */
	461	/* convert timespec -> nsec*/
924b42d5 TJ	462	start_time =
	463	(unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
	464	+ task->real_start_time.tv_nsec;
1da177e4 LT	465	/* convert nsec -> ticks */
	466	start_time = nsec_to_clock_t(start_time);
	467
bda7bad6 KH	468	seq_printf(m, "%d (%s) %c", pid_nr_ns(pid, ns), tcomm, state);
	469	seq_put_decimal_ll(m, ' ', ppid);
	470	seq_put_decimal_ll(m, ' ', pgid);
	471	seq_put_decimal_ll(m, ' ', sid);
	472	seq_put_decimal_ll(m, ' ', tty_nr);
	473	seq_put_decimal_ll(m, ' ', tty_pgrp);
	474	seq_put_decimal_ull(m, ' ', task->flags);
	475	seq_put_decimal_ull(m, ' ', min_flt);
	476	seq_put_decimal_ull(m, ' ', cmin_flt);
	477	seq_put_decimal_ull(m, ' ', maj_flt);
	478	seq_put_decimal_ull(m, ' ', cmaj_flt);
	479	seq_put_decimal_ull(m, ' ', cputime_to_clock_t(utime));
	480	seq_put_decimal_ull(m, ' ', cputime_to_clock_t(stime));
	481	seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cutime));
	482	seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cstime));
	483	seq_put_decimal_ll(m, ' ', priority);
	484	seq_put_decimal_ll(m, ' ', nice);
	485	seq_put_decimal_ll(m, ' ', num_threads);
	486	seq_put_decimal_ull(m, ' ', 0);
	487	seq_put_decimal_ull(m, ' ', start_time);
	488	seq_put_decimal_ull(m, ' ', vsize);
	489	seq_put_decimal_ll(m, ' ', mm ? get_mm_rss(mm) : 0);
	490	seq_put_decimal_ull(m, ' ', rsslim);
	491	seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->start_code : 1) : 0);
	492	seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->end_code : 1) : 0);
	493	seq_put_decimal_ull(m, ' ', (permitted && mm) ? mm->start_stack : 0);
	494	seq_put_decimal_ull(m, ' ', esp);
	495	seq_put_decimal_ull(m, ' ', eip);
	496	/* The signal information here is obsolete.
	497	* It must be decimal for Linux 2.0 compatibility.
	498	* Use /proc/#/status for real-time signals.
	499	*/
	500	seq_put_decimal_ull(m, ' ', task->pending.signal.sig[0] & 0x7fffffffUL);
	501	seq_put_decimal_ull(m, ' ', task->blocked.sig[0] & 0x7fffffffUL);
	502	seq_put_decimal_ull(m, ' ', sigign.sig[0] & 0x7fffffffUL);
	503	seq_put_decimal_ull(m, ' ', sigcatch.sig[0] & 0x7fffffffUL);
	504	seq_put_decimal_ull(m, ' ', wchan);
	505	seq_put_decimal_ull(m, ' ', 0);
	506	seq_put_decimal_ull(m, ' ', 0);
	507	seq_put_decimal_ll(m, ' ', task->exit_signal);
	508	seq_put_decimal_ll(m, ' ', task_cpu(task));
	509	seq_put_decimal_ull(m, ' ', task->rt_priority);
	510	seq_put_decimal_ull(m, ' ', task->policy);
	511	seq_put_decimal_ull(m, ' ', delayacct_blkio_ticks(task));
	512	seq_put_decimal_ull(m, ' ', cputime_to_clock_t(gtime));
	513	seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cgtime));
	514	seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->start_data : 0);
	515	seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->end_data : 0);
	516	seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->start_brk : 0);
	517	seq_putc(m, '\n');
8ea02606	518	if (mm)
1da177e4	519	mmput(mm);
ee992744	520	return 0;
1da177e4 LT	521	}
1da177e4 LT	522
ee992744 EB	523	int proc_tid_stat(struct seq_file m, struct pid_namespace ns,
ee992744 EB	524	struct pid pid, struct task_struct task)
1da177e4	525	{
ee992744	526	return do_task_stat(m, ns, pid, task, 0);
1da177e4 LT	527	}
1da177e4 LT	528
ee992744 EB	529	int proc_tgid_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, 1);
1da177e4 LT	533	}
1da177e4 LT	534
a56d3fc7 EB	535	int proc_pid_statm(struct seq_file m, struct pid_namespace ns,
a56d3fc7 EB	536	struct pid pid, struct task_struct task)
1da177e4	537	{
a2ade7b6	538	unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0;
1da177e4	539	struct mm_struct *mm = get_task_mm(task);
8ea02606	540
1da177e4 LT	541	if (mm) {
	542	size = task_statm(mm, &shared, &text, &data, &resident);
	543	mmput(mm);
	544	}
bda7bad6 KH	545	/*
	546	* For quick read, open code by putting numbers directly
	547	* expected format is
	548	* seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
	549	* size, resident, shared, text, data);
	550	*/
	551	seq_put_decimal_ull(m, 0, size);
	552	seq_put_decimal_ull(m, ' ', resident);
	553	seq_put_decimal_ull(m, ' ', shared);
	554	seq_put_decimal_ull(m, ' ', text);
	555	seq_put_decimal_ull(m, ' ', 0);
3748b2f1	556	seq_put_decimal_ull(m, ' ', data);
bda7bad6 KH	557	seq_put_decimal_ull(m, ' ', 0);
bda7bad6 KH	558	seq_putc(m, '\n');
1da177e4	559
a56d3fc7	560	return 0;
1da177e4	561	}