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/fs/proc/array.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 546 lines | 418 code | 58 blank | 70 comment | 42 complexity | 32f212621b0e6947143e0b6382822951 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  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@lxorguk.ukuu.org.uk>
 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
 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>
 65#include <linux/uaccess.h>
 66#include <linux/io.h>
 67#include <linux/mm.h>
 68#include <linux/hugetlb.h>
 69#include <linux/pagemap.h>
 70#include <linux/swap.h>
 71#include <linux/smp.h>
 72#include <linux/signal.h>
 73#include <linux/highmem.h>
 74#include <linux/file.h>
 75#include <linux/fdtable.h>
 76#include <linux/times.h>
 77#include <linux/cpuset.h>
 78#include <linux/rcupdate.h>
 79#include <linux/delayacct.h>
 80#include <linux/seq_file.h>
 81#include <linux/pid_namespace.h>
 82#include <linux/ptrace.h>
 83#include <linux/tracehook.h>
 84
 85#include <asm/pgtable.h>
 86#include <asm/processor.h>
 87#include "internal.h"
 88
 89static inline void task_name(struct seq_file *m, struct task_struct *p)
 90{
 91	int i;
 92	char *buf, *end;
 93	char *name;
 94	char tcomm[sizeof(p->comm)];
 95
 96	get_task_comm(tcomm, p);
 97
 98	seq_puts(m, "Name:\t");
 99	end = m->buf + m->size;
100	buf = m->buf + m->count;
101	name = tcomm;
102	i = sizeof(tcomm);
103	while (i && (buf < end)) {
104		unsigned char c = *name;
105		name++;
106		i--;
107		*buf = c;
108		if (!c)
109			break;
110		if (c == '\\') {
111			buf++;
112			if (buf < end)
113				*buf++ = c;
114			continue;
115		}
116		if (c == '\n') {
117			*buf++ = '\\';
118			if (buf < end)
119				*buf++ = 'n';
120			continue;
121		}
122		buf++;
123	}
124	m->count = buf - m->buf;
125	seq_putc(m, '\n');
126}
127
128/*
129 * The task state array is a strange "bitmap" of
130 * reasons to sleep. Thus "running" is zero, and
131 * you can test for combinations of others with
132 * simple bit tests.
133 */
134static const char * const task_state_array[] = {
135	"R (running)",		/*   0 */
136	"S (sleeping)",		/*   1 */
137	"D (disk sleep)",	/*   2 */
138	"T (stopped)",		/*   4 */
139	"t (tracing stop)",	/*   8 */
140	"Z (zombie)",		/*  16 */
141	"X (dead)",		/*  32 */
142	"x (dead)",		/*  64 */
143	"K (wakekill)",		/* 128 */
144	"W (waking)",		/* 256 */
145};
146
147static inline const char *get_task_state(struct task_struct *tsk)
148{
149	unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
150	const char * const *p = &task_state_array[0];
151
152	BUILD_BUG_ON(1 + ilog2(TASK_STATE_MAX) != ARRAY_SIZE(task_state_array));
153
154	while (state) {
155		p++;
156		state >>= 1;
157	}
158	return *p;
159}
160
161static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
162				struct pid *pid, struct task_struct *p)
163{
164	struct group_info *group_info;
165	int g;
166	struct fdtable *fdt = NULL;
167	const struct cred *cred;
168	pid_t ppid, tpid;
169
170	rcu_read_lock();
171	ppid = pid_alive(p) ?
172		task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
173	tpid = 0;
174	if (pid_alive(p)) {
175		struct task_struct *tracer = ptrace_parent(p);
176		if (tracer)
177			tpid = task_pid_nr_ns(tracer, ns);
178	}
179	cred = get_task_cred(p);
180	seq_printf(m,
181		"State:\t%s\n"
182		"Tgid:\t%d\n"
183		"Pid:\t%d\n"
184		"PPid:\t%d\n"
185		"TracerPid:\t%d\n"
186		"Uid:\t%d\t%d\t%d\t%d\n"
187		"Gid:\t%d\t%d\t%d\t%d\n",
188		get_task_state(p),
189		task_tgid_nr_ns(p, ns),
190		pid_nr_ns(pid, ns),
191		ppid, tpid,
192		cred->uid, cred->euid, cred->suid, cred->fsuid,
193		cred->gid, cred->egid, cred->sgid, cred->fsgid);
194
195	task_lock(p);
196	if (p->files)
197		fdt = files_fdtable(p->files);
198	seq_printf(m,
199		"FDSize:\t%d\n"
200		"Groups:\t",
201		fdt ? fdt->max_fds : 0);
202	rcu_read_unlock();
203
204	group_info = cred->group_info;
205	task_unlock(p);
206
207	for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
208		seq_printf(m, "%d ", GROUP_AT(group_info, g));
209	put_cred(cred);
210
211	seq_putc(m, '\n');
212}
213
214static void render_sigset_t(struct seq_file *m, const char *header,
215				sigset_t *set)
216{
217	int i;
218
219	seq_puts(m, header);
220
221	i = _NSIG;
222	do {
223		int x = 0;
224
225		i -= 4;
226		if (sigismember(set, i+1)) x |= 1;
227		if (sigismember(set, i+2)) x |= 2;
228		if (sigismember(set, i+3)) x |= 4;
229		if (sigismember(set, i+4)) x |= 8;
230		seq_printf(m, "%x", x);
231	} while (i >= 4);
232
233	seq_putc(m, '\n');
234}
235
236static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
237				    sigset_t *catch)
238{
239	struct k_sigaction *k;
240	int i;
241
242	k = p->sighand->action;
243	for (i = 1; i <= _NSIG; ++i, ++k) {
244		if (k->sa.sa_handler == SIG_IGN)
245			sigaddset(ign, i);
246		else if (k->sa.sa_handler != SIG_DFL)
247			sigaddset(catch, i);
248	}
249}
250
251static inline void task_sig(struct seq_file *m, struct task_struct *p)
252{
253	unsigned long flags;
254	sigset_t pending, shpending, blocked, ignored, caught;
255	int num_threads = 0;
256	unsigned long qsize = 0;
257	unsigned long qlim = 0;
258
259	sigemptyset(&pending);
260	sigemptyset(&shpending);
261	sigemptyset(&blocked);
262	sigemptyset(&ignored);
263	sigemptyset(&caught);
264
265	if (lock_task_sighand(p, &flags)) {
266		pending = p->pending.signal;
267		shpending = p->signal->shared_pending.signal;
268		blocked = p->blocked;
269		collect_sigign_sigcatch(p, &ignored, &caught);
270		num_threads = get_nr_threads(p);
271		rcu_read_lock();  /* FIXME: is this correct? */
272		qsize = atomic_read(&__task_cred(p)->user->sigpending);
273		rcu_read_unlock();
274		qlim = task_rlimit(p, RLIMIT_SIGPENDING);
275		unlock_task_sighand(p, &flags);
276	}
277
278	seq_printf(m, "Threads:\t%d\n", num_threads);
279	seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
280
281	/* render them all */
282	render_sigset_t(m, "SigPnd:\t", &pending);
283	render_sigset_t(m, "ShdPnd:\t", &shpending);
284	render_sigset_t(m, "SigBlk:\t", &blocked);
285	render_sigset_t(m, "SigIgn:\t", &ignored);
286	render_sigset_t(m, "SigCgt:\t", &caught);
287}
288
289static void render_cap_t(struct seq_file *m, const char *header,
290			kernel_cap_t *a)
291{
292	unsigned __capi;
293
294	seq_puts(m, header);
295	CAP_FOR_EACH_U32(__capi) {
296		seq_printf(m, "%08x",
297			   a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
298	}
299	seq_putc(m, '\n');
300}
301
302static inline void task_cap(struct seq_file *m, struct task_struct *p)
303{
304	const struct cred *cred;
305	kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
306
307	rcu_read_lock();
308	cred = __task_cred(p);
309	cap_inheritable	= cred->cap_inheritable;
310	cap_permitted	= cred->cap_permitted;
311	cap_effective	= cred->cap_effective;
312	cap_bset	= cred->cap_bset;
313	rcu_read_unlock();
314
315	render_cap_t(m, "CapInh:\t", &cap_inheritable);
316	render_cap_t(m, "CapPrm:\t", &cap_permitted);
317	render_cap_t(m, "CapEff:\t", &cap_effective);
318	render_cap_t(m, "CapBnd:\t", &cap_bset);
319}
320
321static inline void task_context_switch_counts(struct seq_file *m,
322						struct task_struct *p)
323{
324	seq_printf(m,	"voluntary_ctxt_switches:\t%lu\n"
325			"nonvoluntary_ctxt_switches:\t%lu\n",
326			p->nvcsw,
327			p->nivcsw);
328}
329
330static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
331{
332	seq_puts(m, "Cpus_allowed:\t");
333	seq_cpumask(m, &task->cpus_allowed);
334	seq_putc(m, '\n');
335	seq_puts(m, "Cpus_allowed_list:\t");
336	seq_cpumask_list(m, &task->cpus_allowed);
337	seq_putc(m, '\n');
338}
339
340int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
341			struct pid *pid, struct task_struct *task)
342{
343	struct mm_struct *mm = get_task_mm(task);
344
345	task_name(m, task);
346	task_state(m, ns, pid, task);
347
348	if (mm) {
349		task_mem(m, mm);
350		mmput(mm);
351	}
352	task_sig(m, task);
353	task_cap(m, task);
354	task_cpus_allowed(m, task);
355	cpuset_task_status_allowed(m, task);
356	task_context_switch_counts(m, task);
357	return 0;
358}
359
360static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
361			struct pid *pid, struct task_struct *task, int whole)
362{
363	unsigned long vsize, eip, esp, wchan = ~0UL;
364	long priority, nice;
365	int tty_pgrp = -1, tty_nr = 0;
366	sigset_t sigign, sigcatch;
367	char state;
368	pid_t ppid = 0, pgid = -1, sid = -1;
369	int num_threads = 0;
370	int permitted;
371	struct mm_struct *mm;
372	unsigned long long start_time;
373	unsigned long cmin_flt = 0, cmaj_flt = 0;
374	unsigned long  min_flt = 0,  maj_flt = 0;
375	cputime_t cutime, cstime, utime, stime;
376	cputime_t cgtime, gtime;
377	unsigned long rsslim = 0;
378	char tcomm[sizeof(task->comm)];
379	unsigned long flags;
380
381	state = *get_task_state(task);
382	vsize = eip = esp = 0;
383	permitted = ptrace_may_access(task, PTRACE_MODE_READ);
384	mm = get_task_mm(task);
385	if (mm) {
386		vsize = task_vsize(mm);
387		if (permitted) {
388			eip = KSTK_EIP(task);
389			esp = KSTK_ESP(task);
390		}
391	}
392
393	get_task_comm(tcomm, task);
394
395	sigemptyset(&sigign);
396	sigemptyset(&sigcatch);
397	cutime = cstime = utime = stime = cputime_zero;
398	cgtime = gtime = cputime_zero;
399
400	if (lock_task_sighand(task, &flags)) {
401		struct signal_struct *sig = task->signal;
402
403		if (sig->tty) {
404			struct pid *pgrp = tty_get_pgrp(sig->tty);
405			tty_pgrp = pid_nr_ns(pgrp, ns);
406			put_pid(pgrp);
407			tty_nr = new_encode_dev(tty_devnum(sig->tty));
408		}
409
410		num_threads = get_nr_threads(task);
411		collect_sigign_sigcatch(task, &sigign, &sigcatch);
412
413		cmin_flt = sig->cmin_flt;
414		cmaj_flt = sig->cmaj_flt;
415		cutime = sig->cutime;
416		cstime = sig->cstime;
417		cgtime = sig->cgtime;
418		rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
419
420		/* add up live thread stats at the group level */
421		if (whole) {
422			struct task_struct *t = task;
423			do {
424				min_flt += t->min_flt;
425				maj_flt += t->maj_flt;
426				gtime = cputime_add(gtime, t->gtime);
427				t = next_thread(t);
428			} while (t != task);
429
430			min_flt += sig->min_flt;
431			maj_flt += sig->maj_flt;
432			thread_group_times(task, &utime, &stime);
433			gtime = cputime_add(gtime, sig->gtime);
434		}
435
436		sid = task_session_nr_ns(task, ns);
437		ppid = task_tgid_nr_ns(task->real_parent, ns);
438		pgid = task_pgrp_nr_ns(task, ns);
439
440		unlock_task_sighand(task, &flags);
441	}
442
443	if (permitted && (!whole || num_threads < 2))
444		wchan = get_wchan(task);
445	if (!whole) {
446		min_flt = task->min_flt;
447		maj_flt = task->maj_flt;
448		task_times(task, &utime, &stime);
449		gtime = task->gtime;
450	}
451
452	/* scale priority and nice values from timeslices to -20..20 */
453	/* to make it look like a "normal" Unix priority/nice value  */
454	priority = task_prio(task);
455	nice = task_nice(task);
456
457	/* Temporary variable needed for gcc-2.96 */
458	/* convert timespec -> nsec*/
459	start_time =
460		(unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
461				+ task->real_start_time.tv_nsec;
462	/* convert nsec -> ticks */
463	start_time = nsec_to_clock_t(start_time);
464
465	seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
466%lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
467%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
468		pid_nr_ns(pid, ns),
469		tcomm,
470		state,
471		ppid,
472		pgid,
473		sid,
474		tty_nr,
475		tty_pgrp,
476		task->flags,
477		min_flt,
478		cmin_flt,
479		maj_flt,
480		cmaj_flt,
481		cputime_to_clock_t(utime),
482		cputime_to_clock_t(stime),
483		cputime_to_clock_t(cutime),
484		cputime_to_clock_t(cstime),
485		priority,
486		nice,
487		num_threads,
488		start_time,
489		vsize,
490		mm ? get_mm_rss(mm) : 0,
491		rsslim,
492		mm ? (permitted ? mm->start_code : 1) : 0,
493		mm ? (permitted ? mm->end_code : 1) : 0,
494		(permitted && mm) ? mm->start_stack : 0,
495		esp,
496		eip,
497		/* The signal information here is obsolete.
498		 * It must be decimal for Linux 2.0 compatibility.
499		 * Use /proc/#/status for real-time signals.
500		 */
501		task->pending.signal.sig[0] & 0x7fffffffUL,
502		task->blocked.sig[0] & 0x7fffffffUL,
503		sigign      .sig[0] & 0x7fffffffUL,
504		sigcatch    .sig[0] & 0x7fffffffUL,
505		wchan,
506		0UL,
507		0UL,
508		task->exit_signal,
509		task_cpu(task),
510		task->rt_priority,
511		task->policy,
512		(unsigned long long)delayacct_blkio_ticks(task),
513		cputime_to_clock_t(gtime),
514		cputime_to_clock_t(cgtime));
515	if (mm)
516		mmput(mm);
517	return 0;
518}
519
520int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
521			struct pid *pid, struct task_struct *task)
522{
523	return do_task_stat(m, ns, pid, task, 0);
524}
525
526int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
527			struct pid *pid, struct task_struct *task)
528{
529	return do_task_stat(m, ns, pid, task, 1);
530}
531
532int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
533			struct pid *pid, struct task_struct *task)
534{
535	unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0;
536	struct mm_struct *mm = get_task_mm(task);
537
538	if (mm) {
539		size = task_statm(mm, &shared, &text, &data, &resident);
540		mmput(mm);
541	}
542	seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
543			size, resident, shared, text, data);
544
545	return 0;
546}