[mirror_ubuntu-zesty-kernel.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.Cox@linux.org>
 *
 * 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/slab.h>
#include <linux/smp.h>
#include <linux/signal.h>
#include <linux/highmem.h>
#include <linux/file.h>
#include <linux/times.h>
#include <linux/cpuset.h>
#include <linux/rcupdate.h>
#include <linux/delayacct.h>

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

/* Gcc optimizes away "strlen(x)" for constant x */
#define ADDBUF(buffer, string) \
do { memcpy(buffer, string, strlen(string)); \
     buffer += strlen(string); } while (0)

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

	get_task_comm(tcomm, p);

	ADDBUF(buf, "Name:\t");
	name = tcomm;
	i = sizeof(tcomm);
	do {
		unsigned char c = *name;
		name++;
		i--;
		*buf = c;
		if (!c)
			break;
		if (c == '\\') {
			buf[1] = c;
			buf += 2;
			continue;
		}
		if (c == '\n') {
			buf[0] = '\\';
			buf[1] = 'n';
			buf += 2;
			continue;
		}
		buf++;
	} while (i);
	*buf = '\n';
	return buf+1;
}

/*
 * 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 *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 */
};

static inline const char *get_task_state(struct task_struct *tsk)
{
	unsigned int state = (tsk->state & (TASK_RUNNING |
					    TASK_INTERRUPTIBLE |
					    TASK_UNINTERRUPTIBLE |
					    TASK_STOPPED |
					    TASK_TRACED)) |
			(tsk->exit_state & (EXIT_ZOMBIE |
					    EXIT_DEAD));
	const char **p = &task_state_array[0];

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

static inline char *task_state(struct task_struct *p, char *buffer)
{
	struct group_info *group_info;
	int g;
	struct fdtable *fdt = NULL;

	rcu_read_lock();
	buffer += sprintf(buffer,
		"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),
		p->tgid, p->pid,
		pid_alive(p) ? rcu_dereference(p->real_parent)->tgid : 0,
		pid_alive(p) && p->ptrace ? rcu_dereference(p->parent)->pid : 0,
		p->uid, p->euid, p->suid, p->fsuid,
		p->gid, p->egid, p->sgid, p->fsgid);

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

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

	for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
		buffer += sprintf(buffer, "%d ", GROUP_AT(group_info, g));
	put_group_info(group_info);

	buffer += sprintf(buffer, "\n");
	return buffer;
}

static char *render_sigset_t(const char *header, sigset_t *set, char *buffer)
{
	int i, len;

	len = strlen(header);
	memcpy(buffer, header, len);
	buffer += len;

	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;
		*buffer++ = (x < 10 ? '0' : 'a' - 10) + x;
	} while (i >= 4);

	*buffer++ = '\n';
	*buffer = 0;
	return buffer;
}

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 char *task_sig(struct task_struct *p, char *buffer)
{
	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);

	rcu_read_lock();
	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 = atomic_read(&p->signal->count);
		qsize = atomic_read(&p->user->sigpending);
		qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
		unlock_task_sighand(p, &flags);
	}
	rcu_read_unlock();

	buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
	buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim);

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

	return buffer;
}

static inline char *task_cap(struct task_struct *p, char *buffer)
{
    return buffer + sprintf(buffer, "CapInh:\t%016x\n"
			    "CapPrm:\t%016x\n"
			    "CapEff:\t%016x\n",
			    cap_t(p->cap_inheritable),
			    cap_t(p->cap_permitted),
			    cap_t(p->cap_effective));
}

static inline char *task_context_switch_counts(struct task_struct *p,
						char *buffer)
{
	return buffer + sprintf(buffer, "voluntary_ctxt_switches:\t%lu\n"
			    "nonvoluntary_ctxt_switches:\t%lu\n",
			    p->nvcsw,
			    p->nivcsw);
}

int proc_pid_status(struct task_struct *task, char *buffer)
{
	char *orig = buffer;
	struct mm_struct *mm = get_task_mm(task);

	buffer = task_name(task, buffer);
	buffer = task_state(task, buffer);

	if (mm) {
		buffer = task_mem(mm, buffer);
		mmput(mm);
	}
	buffer = task_sig(task, buffer);
	buffer = task_cap(task, buffer);
	buffer = cpuset_task_status_allowed(task, buffer);
#if defined(CONFIG_S390)
	buffer = task_show_regs(task, buffer);
#endif
	buffer = task_context_switch_counts(task, buffer);
	return buffer - orig;
}

/*
 * Use precise platform statistics if available:
 */
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
static cputime_t task_utime(struct task_struct *p)
{
	return p->utime;
}

static cputime_t task_stime(struct task_struct *p)
{
	return p->stime;
}
#else
static cputime_t task_utime(struct task_struct *p)
{
	clock_t utime = cputime_to_clock_t(p->utime),
		total = utime + cputime_to_clock_t(p->stime);
	u64 temp;

	/*
	 * Use CFS's precise accounting:
	 */
	temp = (u64)nsec_to_clock_t(p->se.sum_exec_runtime);

	if (total) {
		temp *= utime;
		do_div(temp, total);
	}
	utime = (clock_t)temp;

	return clock_t_to_cputime(utime);
}

static cputime_t task_stime(struct task_struct *p)
{
	clock_t stime;

	/*
	 * Use CFS's precise accounting. (we subtract utime from
	 * the total, to make sure the total observed by userspace
	 * grows monotonically - apps rely on that):
	 */
	stime = nsec_to_clock_t(p->se.sum_exec_runtime) -
			cputime_to_clock_t(task_utime(p));

	return clock_t_to_cputime(stime);
}
#endif

static int do_task_stat(struct task_struct *task, char *buffer, 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;
	int res;
	pid_t ppid = 0, pgid = -1, sid = -1;
	int num_threads = 0;
	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;
	unsigned long rsslim = 0;
	char tcomm[sizeof(task->comm)];
	unsigned long flags;

	state = *get_task_state(task);
	vsize = eip = esp = 0;
	mm = get_task_mm(task);
	if (mm) {
		vsize = task_vsize(mm);
		eip = KSTK_EIP(task);
		esp = KSTK_ESP(task);
	}

	get_task_comm(tcomm, task);

	sigemptyset(&sigign);
	sigemptyset(&sigcatch);
	cutime = cstime = utime = stime = cputime_zero;

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

		if (sig->tty) {
			tty_pgrp = pid_nr(sig->tty->pgrp);
			tty_nr = new_encode_dev(tty_devnum(sig->tty));
		}

		num_threads = atomic_read(&sig->count);
		collect_sigign_sigcatch(task, &sigign, &sigcatch);

		cmin_flt = sig->cmin_flt;
		cmaj_flt = sig->cmaj_flt;
		cutime = sig->cutime;
		cstime = sig->cstime;
		rsslim = 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;
				utime = cputime_add(utime, task_utime(t));
				stime = cputime_add(stime, task_stime(t));
				t = next_thread(t);
			} while (t != task);

			min_flt += sig->min_flt;
			maj_flt += sig->maj_flt;
			utime = cputime_add(utime, sig->utime);
			stime = cputime_add(stime, sig->stime);
		}

		sid = signal_session(sig);
		pgid = process_group(task);
		ppid = rcu_dereference(task->real_parent)->tgid;

		unlock_task_sighand(task, &flags);
	}
	rcu_read_unlock();

	if (!whole || num_threads < 2)
		wchan = get_wchan(task);
	if (!whole) {
		min_flt = task->min_flt;
		maj_flt = task->maj_flt;
		utime = task_utime(task);
		stime = task_stime(task);
	}

	/* 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);

	res = sprintf(buffer, "%d (%s) %c %d %d %d %d %d %u %lu \
%lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu\n",
		task->pid,
		tcomm,
		state,
		ppid,
		pgid,
		sid,
		tty_nr,
		tty_pgrp,
		task->flags,
		min_flt,
		cmin_flt,
		maj_flt,
		cmaj_flt,
		cputime_to_clock_t(utime),
		cputime_to_clock_t(stime),
		cputime_to_clock_t(cutime),
		cputime_to_clock_t(cstime),
		priority,
		nice,
		num_threads,
		start_time,
		vsize,
		mm ? get_mm_rss(mm) : 0,
		rsslim,
		mm ? mm->start_code : 0,
		mm ? mm->end_code : 0,
		mm ? mm->start_stack : 0,
		esp,
		eip,
		/* The signal information here is obsolete.
		 * It must be decimal for Linux 2.0 compatibility.
		 * Use /proc/#/status for real-time signals.
		 */
		task->pending.signal.sig[0] & 0x7fffffffUL,
		task->blocked.sig[0] & 0x7fffffffUL,
		sigign      .sig[0] & 0x7fffffffUL,
		sigcatch    .sig[0] & 0x7fffffffUL,
		wchan,
		0UL,
		0UL,
		task->exit_signal,
		task_cpu(task),
		task->rt_priority,
		task->policy,
		(unsigned long long)delayacct_blkio_ticks(task));
	if (mm)
		mmput(mm);
	return res;
}

int proc_tid_stat(struct task_struct *task, char *buffer)
{
	return do_task_stat(task, buffer, 0);
}

int proc_tgid_stat(struct task_struct *task, char *buffer)
{
	return do_task_stat(task, buffer, 1);
}

int proc_pid_statm(struct task_struct *task, char *buffer)
{
	int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
	struct mm_struct *mm = get_task_mm(task);

	if (mm) {
		size = task_statm(mm, &shared, &text, &data, &resident);
		mmput(mm);
	}

	return sprintf(buffer, "%d %d %d %d %d %d %d\n",
		       size, resident, shared, text, lib, data, 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.
	43	* <Alan.Cox@linux.org>
	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>
	71	#include <linux/slab.h>
	72	#include <linux/smp.h>
	73	#include <linux/signal.h>
	74	#include <linux/highmem.h>
	75	#include <linux/file.h>
	76	#include <linux/times.h>
	77	#include <linux/cpuset.h>
4fb3a538	78	#include <linux/rcupdate.h>
25890454	79	#include <linux/delayacct.h>
1da177e4	80
1da177e4	81	#include <asm/pgtable.h>
1da177e4 LT	82	#include <asm/processor.h>
	83	#include "internal.h"
	84
	85	/* Gcc optimizes away "strlen(x)" for constant x */
	86	#define ADDBUF(buffer, string) \
	87	do { memcpy(buffer, string, strlen(string)); \
	88	buffer += strlen(string); } while (0)
	89
8ea02606	90	static inline char task_name(struct task_struct p, char *buf)
1da177e4 LT	91	{
1da177e4 LT	92	int i;
8ea02606	93	char *name;
1da177e4 LT	94	char tcomm[sizeof(p->comm)];
	95
	96	get_task_comm(tcomm, p);
	97
	98	ADDBUF(buf, "Name:\t");
	99	name = tcomm;
	100	i = sizeof(tcomm);
	101	do {
	102	unsigned char c = *name;
	103	name++;
	104	i--;
	105	*buf = c;
	106	if (!c)
	107	break;
	108	if (c == '\\') {
	109	buf[1] = c;
	110	buf += 2;
	111	continue;
	112	}
	113	if (c == '\n') {
	114	buf[0] = '\\';
	115	buf[1] = 'n';
	116	buf += 2;
	117	continue;
	118	}
	119	buf++;
	120	} while (i);
	121	*buf = '\n';
	122	return buf+1;
	123	}
	124
	125	/*
	126	* The task state array is a strange "bitmap" of
	127	* reasons to sleep. Thus "running" is zero, and
	128	* you can test for combinations of others with
	129	* simple bit tests.
	130	*/
	131	static const char *task_state_array[] = {
	132	"R (running)", /* 0 */
	133	"S (sleeping)", /* 1 */
	134	"D (disk sleep)", /* 2 */
	135	"T (stopped)", /* 4 */
	136	"T (tracing stop)", /* 8 */
	137	"Z (zombie)", /* 16 */
	138	"X (dead)" /* 32 */
	139	};
	140
8ea02606	141	static inline const char get_task_state(struct task_struct tsk)
1da177e4 LT	142	{
	143	unsigned int state = (tsk->state & (TASK_RUNNING \|
	144	TASK_INTERRUPTIBLE \|
	145	TASK_UNINTERRUPTIBLE \|
	146	TASK_STOPPED \|
	147	TASK_TRACED)) \|
	148	(tsk->exit_state & (EXIT_ZOMBIE \|
	149	EXIT_DEAD));
	150	const char **p = &task_state_array[0];
	151
	152	while (state) {
	153	p++;
	154	state >>= 1;
	155	}
	156	return *p;
	157	}
	158
8ea02606	159	static inline char task_state(struct task_struct p, char *buffer)
1da177e4 LT	160	{
	161	struct group_info *group_info;
	162	int g;
badf1662	163	struct fdtable *fdt = NULL;
1da177e4	164
b0fa9db6	165	rcu_read_lock();
1da177e4 LT	166	buffer += sprintf(buffer,
1da177e4 LT	167	"State:\t%s\n"
1da177e4 LT	168	"Tgid:\t%d\n"
	169	"Pid:\t%d\n"
	170	"PPid:\t%d\n"
	171	"TracerPid:\t%d\n"
	172	"Uid:\t%d\t%d\t%d\t%d\n"
	173	"Gid:\t%d\t%d\t%d\t%d\n",
	174	get_task_state(p),
8ea02606 IM	175	p->tgid, p->pid,
8ea02606 IM	176	pid_alive(p) ? rcu_dereference(p->real_parent)->tgid : 0,
b0fa9db6	177	pid_alive(p) && p->ptrace ? rcu_dereference(p->parent)->pid : 0,
1da177e4 LT	178	p->uid, p->euid, p->suid, p->fsuid,
1da177e4 LT	179	p->gid, p->egid, p->sgid, p->fsgid);
b0fa9db6	180
1da177e4	181	task_lock(p);
badf1662 DS	182	if (p->files)
badf1662 DS	183	fdt = files_fdtable(p->files);
1da177e4 LT	184	buffer += sprintf(buffer,
	185	"FDSize:\t%d\n"
	186	"Groups:\t",
badf1662	187	fdt ? fdt->max_fds : 0);
4fb3a538	188	rcu_read_unlock();
1da177e4 LT	189
	190	group_info = p->group_info;
	191	get_group_info(group_info);
	192	task_unlock(p);
	193
8ea02606 IM	194	for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
8ea02606 IM	195	buffer += sprintf(buffer, "%d ", GROUP_AT(group_info, g));
1da177e4 LT	196	put_group_info(group_info);
	197
	198	buffer += sprintf(buffer, "\n");
	199	return buffer;
	200	}
	201
8ea02606	202	static char render_sigset_t(const char header, sigset_t set, char buffer)
1da177e4 LT	203	{
	204	int i, len;
	205
	206	len = strlen(header);
	207	memcpy(buffer, header, len);
	208	buffer += len;
	209
	210	i = _NSIG;
	211	do {
	212	int x = 0;
	213
	214	i -= 4;
	215	if (sigismember(set, i+1)) x \|= 1;
	216	if (sigismember(set, i+2)) x \|= 2;
	217	if (sigismember(set, i+3)) x \|= 4;
	218	if (sigismember(set, i+4)) x \|= 8;
	219	*buffer++ = (x < 10 ? '0' : 'a' - 10) + x;
	220	} while (i >= 4);
	221
	222	*buffer++ = '\n';
	223	*buffer = 0;
	224	return buffer;
	225	}
	226
	227	static void collect_sigign_sigcatch(struct task_struct p, sigset_t ign,
	228	sigset_t *catch)
	229	{
	230	struct k_sigaction *k;
	231	int i;
	232
	233	k = p->sighand->action;
	234	for (i = 1; i <= _NSIG; ++i, ++k) {
	235	if (k->sa.sa_handler == SIG_IGN)
	236	sigaddset(ign, i);
	237	else if (k->sa.sa_handler != SIG_DFL)
	238	sigaddset(catch, i);
	239	}
	240	}
	241
8ea02606	242	static inline char task_sig(struct task_struct p, char *buffer)
1da177e4	243	{
5e6b3f42	244	unsigned long flags;
1da177e4 LT	245	sigset_t pending, shpending, blocked, ignored, caught;
	246	int num_threads = 0;
	247	unsigned long qsize = 0;
	248	unsigned long qlim = 0;
	249
	250	sigemptyset(&pending);
	251	sigemptyset(&shpending);
	252	sigemptyset(&blocked);
	253	sigemptyset(&ignored);
	254	sigemptyset(&caught);
	255
5e6b3f42 ON	256	rcu_read_lock();
5e6b3f42 ON	257	if (lock_task_sighand(p, &flags)) {
1da177e4 LT	258	pending = p->pending.signal;
	259	shpending = p->signal->shared_pending.signal;
	260	blocked = p->blocked;
	261	collect_sigign_sigcatch(p, &ignored, &caught);
	262	num_threads = atomic_read(&p->signal->count);
	263	qsize = atomic_read(&p->user->sigpending);
	264	qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
5e6b3f42	265	unlock_task_sighand(p, &flags);
1da177e4	266	}
5e6b3f42	267	rcu_read_unlock();
1da177e4 LT	268
	269	buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
	270	buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim);
	271
	272	/* render them all */
	273	buffer = render_sigset_t("SigPnd:\t", &pending, buffer);
	274	buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer);
	275	buffer = render_sigset_t("SigBlk:\t", &blocked, buffer);
	276	buffer = render_sigset_t("SigIgn:\t", &ignored, buffer);
	277	buffer = render_sigset_t("SigCgt:\t", &caught, buffer);
	278
	279	return buffer;
	280	}
	281
	282	static inline char task_cap(struct task_struct p, char *buffer)
	283	{
	284	return buffer + sprintf(buffer, "CapInh:\t%016x\n"
	285	"CapPrm:\t%016x\n"
	286	"CapEff:\t%016x\n",
	287	cap_t(p->cap_inheritable),
	288	cap_t(p->cap_permitted),
	289	cap_t(p->cap_effective));
	290	}
	291
b663a79c MU	292	static inline char task_context_switch_counts(struct task_struct p,
	293	char *buffer)
	294	{
	295	return buffer + sprintf(buffer, "voluntary_ctxt_switches:\t%lu\n"
	296	"nonvoluntary_ctxt_switches:\t%lu\n",
	297	p->nvcsw,
	298	p->nivcsw);
	299	}
	300
8ea02606	301	int proc_pid_status(struct task_struct task, char buffer)
1da177e4	302	{
8ea02606	303	char *orig = buffer;
1da177e4 LT	304	struct mm_struct *mm = get_task_mm(task);
	305
	306	buffer = task_name(task, buffer);
	307	buffer = task_state(task, buffer);
8ea02606	308
1da177e4 LT	309	if (mm) {
	310	buffer = task_mem(mm, buffer);
	311	mmput(mm);
	312	}
	313	buffer = task_sig(task, buffer);
	314	buffer = task_cap(task, buffer);
	315	buffer = cpuset_task_status_allowed(task, buffer);
347a8dc3	316	#if defined(CONFIG_S390)
1da177e4 LT	317	buffer = task_show_regs(task, buffer);
1da177e4 LT	318	#endif
b663a79c	319	buffer = task_context_switch_counts(task, buffer);
1da177e4 LT	320	return buffer - orig;
	321	}
	322
efe567fc CB	323	/*
	324	* Use precise platform statistics if available:
	325	*/
	326	#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	327	static cputime_t task_utime(struct task_struct *p)
	328	{
	329	return p->utime;
	330	}
	331
	332	static cputime_t task_stime(struct task_struct *p)
	333	{
	334	return p->stime;
	335	}
	336	#else
	337	static cputime_t task_utime(struct task_struct *p)
b27f03d4 IM	338	{
	339	clock_t utime = cputime_to_clock_t(p->utime),
	340	total = utime + cputime_to_clock_t(p->stime);
	341	u64 temp;
	342
	343	/*
	344	* Use CFS's precise accounting:
	345	*/
	346	temp = (u64)nsec_to_clock_t(p->se.sum_exec_runtime);
	347
	348	if (total) {
	349	temp *= utime;
	350	do_div(temp, total);
	351	}
	352	utime = (clock_t)temp;
	353
efe567fc	354	return clock_t_to_cputime(utime);
b27f03d4 IM	355	}
b27f03d4 IM	356
efe567fc	357	static cputime_t task_stime(struct task_struct *p)
b27f03d4	358	{
5926c50b	359	clock_t stime;
b27f03d4 IM	360
	361	/*
	362	* Use CFS's precise accounting. (we subtract utime from
	363	* the total, to make sure the total observed by userspace
	364	* grows monotonically - apps rely on that):
	365	*/
efe567fc CB	366	stime = nsec_to_clock_t(p->se.sum_exec_runtime) -
efe567fc CB	367	cputime_to_clock_t(task_utime(p));
b27f03d4	368
efe567fc	369	return clock_t_to_cputime(stime);
b27f03d4	370	}
efe567fc	371	#endif
b27f03d4	372
8ea02606	373	static int do_task_stat(struct task_struct task, char buffer, int whole)
1da177e4 LT	374	{
	375	unsigned long vsize, eip, esp, wchan = ~0UL;
	376	long priority, nice;
	377	int tty_pgrp = -1, tty_nr = 0;
	378	sigset_t sigign, sigcatch;
	379	char state;
	380	int res;
8ea02606	381	pid_t ppid = 0, pgid = -1, sid = -1;
1da177e4 LT	382	int num_threads = 0;
	383	struct mm_struct *mm;
	384	unsigned long long start_time;
	385	unsigned long cmin_flt = 0, cmaj_flt = 0;
	386	unsigned long min_flt = 0, maj_flt = 0;
efe567fc	387	cputime_t cutime, cstime, utime, stime;
1da177e4	388	unsigned long rsslim = 0;
1da177e4	389	char tcomm[sizeof(task->comm)];
a593d6ed	390	unsigned long flags;
1da177e4 LT	391
	392	state = *get_task_state(task);
	393	vsize = eip = esp = 0;
	394	mm = get_task_mm(task);
	395	if (mm) {
	396	vsize = task_vsize(mm);
	397	eip = KSTK_EIP(task);
	398	esp = KSTK_ESP(task);
	399	}
	400
	401	get_task_comm(tcomm, task);
	402
	403	sigemptyset(&sigign);
	404	sigemptyset(&sigcatch);
efe567fc	405	cutime = cstime = utime = stime = cputime_zero;
3cfd0885	406
a593d6ed ON	407	rcu_read_lock();
	408	if (lock_task_sighand(task, &flags)) {
	409	struct signal_struct *sig = task->signal;
91593504 ON	410
91593504 ON	411	if (sig->tty) {
ab521dc0	412	tty_pgrp = pid_nr(sig->tty->pgrp);
91593504	413	tty_nr = new_encode_dev(tty_devnum(sig->tty));
a593d6ed ON	414	}
	415
	416	num_threads = atomic_read(&sig->count);
1da177e4 LT	417	collect_sigign_sigcatch(task, &sigign, &sigcatch);
1da177e4 LT	418
a593d6ed ON	419	cmin_flt = sig->cmin_flt;
	420	cmaj_flt = sig->cmaj_flt;
	421	cutime = sig->cutime;
	422	cstime = sig->cstime;
	423	rsslim = sig->rlim[RLIMIT_RSS].rlim_cur;
	424
1da177e4 LT	425	/* add up live thread stats at the group level */
1da177e4 LT	426	if (whole) {
a593d6ed	427	struct task_struct *t = task;
1da177e4 LT	428	do {
	429	min_flt += t->min_flt;
	430	maj_flt += t->maj_flt;
efe567fc CB	431	utime = cputime_add(utime, task_utime(t));
efe567fc CB	432	stime = cputime_add(stime, task_stime(t));
1da177e4 LT	433	t = next_thread(t);
1da177e4 LT	434	} while (t != task);
1da177e4	435
a593d6ed ON	436	min_flt += sig->min_flt;
a593d6ed ON	437	maj_flt += sig->maj_flt;
efe567fc CB	438	utime = cputime_add(utime, sig->utime);
efe567fc CB	439	stime = cputime_add(stime, sig->stime);
1da177e4	440	}
a593d6ed	441
1ec320af	442	sid = signal_session(sig);
1da177e4	443	pgid = process_group(task);
a593d6ed ON	444	ppid = rcu_dereference(task->real_parent)->tgid;
	445
	446	unlock_task_sighand(task, &flags);
1da177e4	447	}
a593d6ed	448	rcu_read_unlock();
1da177e4	449
8ea02606	450	if (!whole \|\| num_threads < 2)
1da177e4 LT	451	wchan = get_wchan(task);
	452	if (!whole) {
	453	min_flt = task->min_flt;
	454	maj_flt = task->maj_flt;
b27f03d4 IM	455	utime = task_utime(task);
b27f03d4 IM	456	stime = task_stime(task);
1da177e4 LT	457	}
	458
	459	/* scale priority and nice values from timeslices to -20..20 */
	460	/* to make it look like a "normal" Unix priority/nice value */
	461	priority = task_prio(task);
	462	nice = task_nice(task);
	463
	464	/* Temporary variable needed for gcc-2.96 */
	465	/* convert timespec -> nsec*/
924b42d5 TJ	466	start_time =
	467	(unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
	468	+ task->real_start_time.tv_nsec;
1da177e4 LT	469	/* convert nsec -> ticks */
	470	start_time = nsec_to_clock_t(start_time);
	471
8ea02606	472	res = sprintf(buffer, "%d (%s) %c %d %d %d %d %d %u %lu \
4dee26b7	473	%lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
97dc32cd	474	%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu\n",
1da177e4 LT	475	task->pid,
	476	tcomm,
	477	state,
	478	ppid,
	479	pgid,
	480	sid,
	481	tty_nr,
	482	tty_pgrp,
	483	task->flags,
	484	min_flt,
	485	cmin_flt,
	486	maj_flt,
	487	cmaj_flt,
efe567fc CB	488	cputime_to_clock_t(utime),
efe567fc CB	489	cputime_to_clock_t(stime),
1da177e4 LT	490	cputime_to_clock_t(cutime),
	491	cputime_to_clock_t(cstime),
	492	priority,
	493	nice,
	494	num_threads,
1da177e4 LT	495	start_time,
1da177e4 LT	496	vsize,
4294621f	497	mm ? get_mm_rss(mm) : 0,
8ea02606	498	rsslim,
1da177e4 LT	499	mm ? mm->start_code : 0,
	500	mm ? mm->end_code : 0,
	501	mm ? mm->start_stack : 0,
	502	esp,
	503	eip,
	504	/* The signal information here is obsolete.
	505	* It must be decimal for Linux 2.0 compatibility.
	506	* Use /proc/#/status for real-time signals.
	507	*/
	508	task->pending.signal.sig[0] & 0x7fffffffUL,
	509	task->blocked.sig[0] & 0x7fffffffUL,
	510	sigign .sig[0] & 0x7fffffffUL,
	511	sigcatch .sig[0] & 0x7fffffffUL,
	512	wchan,
	513	0UL,
	514	0UL,
	515	task->exit_signal,
	516	task_cpu(task),
	517	task->rt_priority,
25890454 SN	518	task->policy,
25890454 SN	519	(unsigned long long)delayacct_blkio_ticks(task));
8ea02606	520	if (mm)
1da177e4 LT	521	mmput(mm);
	522	return res;
	523	}
	524
8ea02606	525	int proc_tid_stat(struct task_struct task, char buffer)
1da177e4 LT	526	{
	527	return do_task_stat(task, buffer, 0);
	528	}
	529
8ea02606	530	int proc_tgid_stat(struct task_struct task, char buffer)
1da177e4 LT	531	{
	532	return do_task_stat(task, buffer, 1);
	533	}
	534
	535	int proc_pid_statm(struct task_struct task, char buffer)
	536	{
	537	int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
	538	struct mm_struct *mm = get_task_mm(task);
8ea02606	539
1da177e4 LT	540	if (mm) {
	541	size = task_statm(mm, &shared, &text, &data, &resident);
	542	mmput(mm);
	543	}
	544
8ea02606	545	return sprintf(buffer, "%d %d %d %d %d %d %d\n",
1da177e4 LT	546	size, resident, shared, text, lib, data, 0);
1da177e4 LT	547	}