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
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/mm.h>
66#include <linux/hugetlb.h>
67#include <linux/pagemap.h>
68#include <linux/swap.h>
69#include <linux/slab.h>
70#include <linux/smp.h>
71#include <linux/signal.h>
72#include <linux/highmem.h>
73#include <linux/file.h>
74#include <linux/times.h>
75#include <linux/cpuset.h>
76#include <linux/rcupdate.h>
77#include <linux/delayacct.h>
78
79#include <asm/uaccess.h>
80#include <asm/pgtable.h>
81#include <asm/io.h>
82#include <asm/processor.h>
83#include "internal.h"
84
85/* Gcc optimizes away "strlen(x)" for constant x */
86#define ADDBUF(buffer, string) \
87do { memcpy(buffer, string, strlen(string)); \
88     buffer += strlen(string); } while (0)
89
90static inline char * task_name(struct task_struct *p, char * buf)
91{
92	int i;
93	char * name;
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 */
131static 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
141static inline const char * get_task_state(struct task_struct *tsk)
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
159static inline char * task_state(struct task_struct *p, char *buffer)
160{
161	struct group_info *group_info;
162	int g;
163	struct fdtable *fdt = NULL;
164
165	rcu_read_lock();
166	buffer += sprintf(buffer,
167		"State:\t%s\n"
168		"SleepAVG:\t%lu%%\n"
169		"Tgid:\t%d\n"
170		"Pid:\t%d\n"
171		"PPid:\t%d\n"
172		"TracerPid:\t%d\n"
173		"Uid:\t%d\t%d\t%d\t%d\n"
174		"Gid:\t%d\t%d\t%d\t%d\n",
175		get_task_state(p),
176		(p->sleep_avg/1024)*100/(1020000000/1024),
177	       	p->tgid, p->pid,
178	       	pid_alive(p) ? rcu_dereference(p->real_parent)->tgid : 0,
179		pid_alive(p) && p->ptrace ? rcu_dereference(p->parent)->pid : 0,
180		p->uid, p->euid, p->suid, p->fsuid,
181		p->gid, p->egid, p->sgid, p->fsgid);
182
183	task_lock(p);
184	if (p->files)
185		fdt = files_fdtable(p->files);
186	buffer += sprintf(buffer,
187		"FDSize:\t%d\n"
188		"Groups:\t",
189		fdt ? fdt->max_fds : 0);
190	rcu_read_unlock();
191
192	group_info = p->group_info;
193	get_group_info(group_info);
194	task_unlock(p);
195
196	for (g = 0; g < min(group_info->ngroups,NGROUPS_SMALL); g++)
197		buffer += sprintf(buffer, "%d ", GROUP_AT(group_info,g));
198	put_group_info(group_info);
199
200	buffer += sprintf(buffer, "\n");
201	return buffer;
202}
203
204static char * render_sigset_t(const char *header, sigset_t *set, char *buffer)
205{
206	int i, len;
207
208	len = strlen(header);
209	memcpy(buffer, header, len);
210	buffer += len;
211
212	i = _NSIG;
213	do {
214		int x = 0;
215
216		i -= 4;
217		if (sigismember(set, i+1)) x |= 1;
218		if (sigismember(set, i+2)) x |= 2;
219		if (sigismember(set, i+3)) x |= 4;
220		if (sigismember(set, i+4)) x |= 8;
221		*buffer++ = (x < 10 ? '0' : 'a' - 10) + x;
222	} while (i >= 4);
223
224	*buffer++ = '\n';
225	*buffer = 0;
226	return buffer;
227}
228
229static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
230				    sigset_t *catch)
231{
232	struct k_sigaction *k;
233	int i;
234
235	k = p->sighand->action;
236	for (i = 1; i <= _NSIG; ++i, ++k) {
237		if (k->sa.sa_handler == SIG_IGN)
238			sigaddset(ign, i);
239		else if (k->sa.sa_handler != SIG_DFL)
240			sigaddset(catch, i);
241	}
242}
243
244static inline char * task_sig(struct task_struct *p, char *buffer)
245{
246	unsigned long flags;
247	sigset_t pending, shpending, blocked, ignored, caught;
248	int num_threads = 0;
249	unsigned long qsize = 0;
250	unsigned long qlim = 0;
251
252	sigemptyset(&pending);
253	sigemptyset(&shpending);
254	sigemptyset(&blocked);
255	sigemptyset(&ignored);
256	sigemptyset(&caught);
257
258	rcu_read_lock();
259	if (lock_task_sighand(p, &flags)) {
260		pending = p->pending.signal;
261		shpending = p->signal->shared_pending.signal;
262		blocked = p->blocked;
263		collect_sigign_sigcatch(p, &ignored, &caught);
264		num_threads = atomic_read(&p->signal->count);
265		qsize = atomic_read(&p->user->sigpending);
266		qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
267		unlock_task_sighand(p, &flags);
268	}
269	rcu_read_unlock();
270
271	buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
272	buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim);
273
274	/* render them all */
275	buffer = render_sigset_t("SigPnd:\t", &pending, buffer);
276	buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer);
277	buffer = render_sigset_t("SigBlk:\t", &blocked, buffer);
278	buffer = render_sigset_t("SigIgn:\t", &ignored, buffer);
279	buffer = render_sigset_t("SigCgt:\t", &caught, buffer);
280
281	return buffer;
282}
283
284static inline char *task_cap(struct task_struct *p, char *buffer)
285{
286    return buffer + sprintf(buffer, "CapInh:\t%016x\n"
287			    "CapPrm:\t%016x\n"
288			    "CapEff:\t%016x\n",
289			    cap_t(p->cap_inheritable),
290			    cap_t(p->cap_permitted),
291			    cap_t(p->cap_effective));
292}
293
294int proc_pid_status(struct task_struct *task, char * buffer)
295{
296	char * orig = buffer;
297	struct mm_struct *mm = get_task_mm(task);
298
299	buffer = task_name(task, buffer);
300	buffer = task_state(task, buffer);
301
302	if (mm) {
303		buffer = task_mem(mm, buffer);
304		mmput(mm);
305	}
306	buffer = task_sig(task, buffer);
307	buffer = task_cap(task, buffer);
308	buffer = cpuset_task_status_allowed(task, buffer);
309#if defined(CONFIG_S390)
310	buffer = task_show_regs(task, buffer);
311#endif
312	return buffer - orig;
313}
314
315static int do_task_stat(struct task_struct *task, char * buffer, int whole)
316{
317	unsigned long vsize, eip, esp, wchan = ~0UL;
318	long priority, nice;
319	int tty_pgrp = -1, tty_nr = 0;
320	sigset_t sigign, sigcatch;
321	char state;
322	int res;
323 	pid_t ppid = 0, pgid = -1, sid = -1;
324	int num_threads = 0;
325	struct mm_struct *mm;
326	unsigned long long start_time;
327	unsigned long cmin_flt = 0, cmaj_flt = 0;
328	unsigned long  min_flt = 0,  maj_flt = 0;
329	cputime_t cutime, cstime, utime, stime;
330	unsigned long rsslim = 0;
331	char tcomm[sizeof(task->comm)];
332	unsigned long flags;
333
334	state = *get_task_state(task);
335	vsize = eip = esp = 0;
336	mm = get_task_mm(task);
337	if (mm) {
338		vsize = task_vsize(mm);
339		eip = KSTK_EIP(task);
340		esp = KSTK_ESP(task);
341	}
342
343	get_task_comm(tcomm, task);
344
345	sigemptyset(&sigign);
346	sigemptyset(&sigcatch);
347	cutime = cstime = utime = stime = cputime_zero;
348
349	rcu_read_lock();
350	if (lock_task_sighand(task, &flags)) {
351		struct signal_struct *sig = task->signal;
352
353		if (sig->tty) {
354			tty_pgrp = pid_nr(sig->tty->pgrp);
355			tty_nr = new_encode_dev(tty_devnum(sig->tty));
356		}
357
358		num_threads = atomic_read(&sig->count);
359		collect_sigign_sigcatch(task, &sigign, &sigcatch);
360
361		cmin_flt = sig->cmin_flt;
362		cmaj_flt = sig->cmaj_flt;
363		cutime = sig->cutime;
364		cstime = sig->cstime;
365		rsslim = sig->rlim[RLIMIT_RSS].rlim_cur;
366
367		/* add up live thread stats at the group level */
368		if (whole) {
369			struct task_struct *t = task;
370			do {
371				min_flt += t->min_flt;
372				maj_flt += t->maj_flt;
373				utime = cputime_add(utime, t->utime);
374				stime = cputime_add(stime, t->stime);
375				t = next_thread(t);
376			} while (t != task);
377
378			min_flt += sig->min_flt;
379			maj_flt += sig->maj_flt;
380			utime = cputime_add(utime, sig->utime);
381			stime = cputime_add(stime, sig->stime);
382		}
383
384		sid = signal_session(sig);
385		pgid = process_group(task);
386		ppid = rcu_dereference(task->real_parent)->tgid;
387
388		unlock_task_sighand(task, &flags);
389	}
390	rcu_read_unlock();
391
392	if (!whole || num_threads<2)
393		wchan = get_wchan(task);
394	if (!whole) {
395		min_flt = task->min_flt;
396		maj_flt = task->maj_flt;
397		utime = task->utime;
398		stime = task->stime;
399	}
400
401	/* scale priority and nice values from timeslices to -20..20 */
402	/* to make it look like a "normal" Unix priority/nice value  */
403	priority = task_prio(task);
404	nice = task_nice(task);
405
406	/* Temporary variable needed for gcc-2.96 */
407	/* convert timespec -> nsec*/
408	start_time = (unsigned long long)task->start_time.tv_sec * NSEC_PER_SEC
409				+ task->start_time.tv_nsec;
410	/* convert nsec -> ticks */
411	start_time = nsec_to_clock_t(start_time);
412
413	res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %u %lu \
414%lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
415%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu\n",
416		task->pid,
417		tcomm,
418		state,
419		ppid,
420		pgid,
421		sid,
422		tty_nr,
423		tty_pgrp,
424		task->flags,
425		min_flt,
426		cmin_flt,
427		maj_flt,
428		cmaj_flt,
429		cputime_to_clock_t(utime),
430		cputime_to_clock_t(stime),
431		cputime_to_clock_t(cutime),
432		cputime_to_clock_t(cstime),
433		priority,
434		nice,
435		num_threads,
436		start_time,
437		vsize,
438		mm ? get_mm_rss(mm) : 0,
439	        rsslim,
440		mm ? mm->start_code : 0,
441		mm ? mm->end_code : 0,
442		mm ? mm->start_stack : 0,
443		esp,
444		eip,
445		/* The signal information here is obsolete.
446		 * It must be decimal for Linux 2.0 compatibility.
447		 * Use /proc/#/status for real-time signals.
448		 */
449		task->pending.signal.sig[0] & 0x7fffffffUL,
450		task->blocked.sig[0] & 0x7fffffffUL,
451		sigign      .sig[0] & 0x7fffffffUL,
452		sigcatch    .sig[0] & 0x7fffffffUL,
453		wchan,
454		0UL,
455		0UL,
456		task->exit_signal,
457		task_cpu(task),
458		task->rt_priority,
459		task->policy,
460		(unsigned long long)delayacct_blkio_ticks(task));
461	if(mm)
462		mmput(mm);
463	return res;
464}
465
466int proc_tid_stat(struct task_struct *task, char * buffer)
467{
468	return do_task_stat(task, buffer, 0);
469}
470
471int proc_tgid_stat(struct task_struct *task, char * buffer)
472{
473	return do_task_stat(task, buffer, 1);
474}
475
476int proc_pid_statm(struct task_struct *task, char *buffer)
477{
478	int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
479	struct mm_struct *mm = get_task_mm(task);
480
481	if (mm) {
482		size = task_statm(mm, &shared, &text, &data, &resident);
483		mmput(mm);
484	}
485
486	return sprintf(buffer,"%d %d %d %d %d %d %d\n",
487		       size, resident, shared, text, lib, data, 0);
488}
489