fs/proc/array.c - kernel/msm-4.9 - Gitiles

 /*
  *  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 <linux/pid_namespace.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;
 	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;
 	struct pid_namespace *ns;
 	pid_t ppid, tpid;

 	ns = current->nsproxy->pid_ns;
 	rcu_read_lock();
 	ppid = pid_alive(p) ?
 		task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
 	tpid = pid_alive(p) && p->ptrace ?
 		task_ppid_nr_ns(rcu_dereference(p->parent), ns) : 0;
 	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),
 		task_tgid_nr_ns(p, ns),
 		task_pid_nr_ns(p, ns),
 		ppid, tpid,
 		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 cputime_t task_gtime(struct task_struct *p)
 {
 	return p->gtime;
 }

 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;
 	cputime_t cgtime, gtime;
 	unsigned long rsslim = 0;
 	char tcomm[sizeof(task->comm)];
 	unsigned long flags;
 	struct pid_namespace *ns;

 	ns = current->nsproxy->pid_ns;

 	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;
 	cgtime = gtime = cputime_zero;

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

 		if (sig->tty) {
 			tty_pgrp = pid_nr_ns(sig->tty->pgrp, ns);
 			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;
 		cgtime = sig->cgtime;
 		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));
 				gtime = cputime_add(gtime, task_gtime(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);
 			gtime += cputime_add(gtime, sig->gtime);
 		}

 		sid = task_session_nr_ns(task, ns);
 		pgid = task_pgrp_nr_ns(task, ns);
 		ppid = task_ppid_nr_ns(task, ns);

 		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);
 		gtime = task_gtime(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 %lu %ld\n",
 		task_pid_nr_ns(task, ns),
 		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),
 		cputime_to_clock_t(gtime),
 		cputime_to_clock_t(cgtime));
 	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);
 }
	/*
	* 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 <linux/pid_namespace.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;
	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;
	struct pid_namespace *ns;
	pid_t ppid, tpid;

	ns = current->nsproxy->pid_ns;
	rcu_read_lock();
	ppid = pid_alive(p) ?
	task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
	tpid = pid_alive(p) && p->ptrace ?
	task_ppid_nr_ns(rcu_dereference(p->parent), ns) : 0;
	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),
	task_tgid_nr_ns(p, ns),
	task_pid_nr_ns(p, ns),
	ppid, tpid,
	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 cputime_t task_gtime(struct task_struct *p)
	{
	return p->gtime;
	}

	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;
	cputime_t cgtime, gtime;
	unsigned long rsslim = 0;
	char tcomm[sizeof(task->comm)];
	unsigned long flags;
	struct pid_namespace *ns;

	ns = current->nsproxy->pid_ns;

	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;
	cgtime = gtime = cputime_zero;

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

	if (sig->tty) {
	tty_pgrp = pid_nr_ns(sig->tty->pgrp, ns);
	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;
	cgtime = sig->cgtime;
	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));
	gtime = cputime_add(gtime, task_gtime(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);
	gtime += cputime_add(gtime, sig->gtime);
	}

	sid = task_session_nr_ns(task, ns);
	pgid = task_pgrp_nr_ns(task, ns);
	ppid = task_ppid_nr_ns(task, ns);

	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);
	gtime = task_gtime(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 %lu %ld\n",
	task_pid_nr_ns(task, ns),
	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),
	cputime_to_clock_t(gtime),
	cputime_to_clock_t(cgtime));
	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);
	}