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/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/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>
78 #include <linux/rcupdate.h>
79 #include <linux/delayacct.h>
80 #include <linux/seq_file.h>
81 #include <linux/pid_namespace.h>
82
83 #include <asm/pgtable.h>
84 #include <asm/processor.h>
85 #include "internal.h"
86
87 /* Gcc optimizes away "strlen(x)" for constant x */
88 #define ADDBUF(buffer, string) \
89 do { memcpy(buffer, string, strlen(string)); \
90 buffer += strlen(string); } while (0)
91
92 static inline void task_name(struct seq_file *m, struct task_struct *p)
93 {
94 int i;
95 char *buf, *end;
96 char *name;
97 char tcomm[sizeof(p->comm)];
98
99 get_task_comm(tcomm, p);
100
101 seq_printf(m, "Name:\t");
102 end = m->buf + m->size;
103 buf = m->buf + m->count;
104 name = tcomm;
105 i = sizeof(tcomm);
106 while (i && (buf < end)) {
107 unsigned char c = *name;
108 name++;
109 i--;
110 *buf = c;
111 if (!c)
112 break;
113 if (c == '\\') {
114 buf++;
115 if (buf < end)
116 *buf++ = c;
117 continue;
118 }
119 if (c == '\n') {
120 *buf++ = '\\';
121 if (buf < end)
122 *buf++ = 'n';
123 continue;
124 }
125 buf++;
126 }
127 m->count = buf - m->buf;
128 seq_printf(m, "\n");
129 }
130
131 /*
132 * The task state array is a strange "bitmap" of
133 * reasons to sleep. Thus "running" is zero, and
134 * you can test for combinations of others with
135 * simple bit tests.
136 */
137 static const char *task_state_array[] = {
138 "R (running)", /* 0 */
139 "M (running-mutex)", /* 1 */
140 "S (sleeping)", /* 2 */
141 "D (disk sleep)", /* 4 */
142 "T (stopped)", /* 8 */
143 "T (tracing stop)", /* 16 */
144 "Z (zombie)", /* 32 */
145 "X (dead)" /* 64 */
146 };
147
148 static inline const char *get_task_state(struct task_struct *tsk)
149 {
150 unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
151 const char **p = &task_state_array[0];
152
153 while (state) {
154 p++;
155 state >>= 1;
156 }
157 return *p;
158 }
159
160 static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
161 struct pid *pid, struct task_struct *p)
162 {
163 struct group_info *group_info;
164 int g;
165 struct fdtable *fdt = NULL;
166 pid_t ppid, tpid;
167
168 rcu_read_lock();
169 ppid = pid_alive(p) ?
170 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
171 tpid = pid_alive(p) && p->ptrace ?
172 task_pid_nr_ns(rcu_dereference(p->parent), ns) : 0;
173 seq_printf(m,
174 "State:\t%s\n"
175 "Tgid:\t%d\n"
176 "Pid:\t%d\n"
177 "PPid:\t%d\n"
178 "TracerPid:\t%d\n"
179 "Uid:\t%d\t%d\t%d\t%d\n"
180 "Gid:\t%d\t%d\t%d\t%d\n",
181 get_task_state(p),
182 task_tgid_nr_ns(p, ns),
183 pid_nr_ns(pid, ns),
184 ppid, tpid,
185 p->uid, p->euid, p->suid, p->fsuid,
186 p->gid, p->egid, p->sgid, p->fsgid);
187
188 task_lock(p);
189 if (p->files)
190 fdt = files_fdtable(p->files);
191 seq_printf(m,
192 "FDSize:\t%d\n"
193 "Groups:\t",
194 fdt ? fdt->max_fds : 0);
195 rcu_read_unlock();
196
197 group_info = p->group_info;
198 get_group_info(group_info);
199 task_unlock(p);
200
201 for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
202 seq_printf(m, "%d ", GROUP_AT(group_info, g));
203 put_group_info(group_info);
204
205 seq_printf(m, "\n");
206 }
207
208 static void render_sigset_t(struct seq_file *m, const char *header,
209 sigset_t *set)
210 {
211 int i;
212
213 seq_printf(m, "%s", header);
214
215 i = _NSIG;
216 do {
217 int x = 0;
218
219 i -= 4;
220 if (sigismember(set, i+1)) x |= 1;
221 if (sigismember(set, i+2)) x |= 2;
222 if (sigismember(set, i+3)) x |= 4;
223 if (sigismember(set, i+4)) x |= 8;
224 seq_printf(m, "%x", x);
225 } while (i >= 4);
226
227 seq_printf(m, "\n");
228 }
229
230 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
231 sigset_t *catch)
232 {
233 struct k_sigaction *k;
234 int i;
235
236 k = p->sighand->action;
237 for (i = 1; i <= _NSIG; ++i, ++k) {
238 if (k->sa.sa_handler == SIG_IGN)
239 sigaddset(ign, i);
240 else if (k->sa.sa_handler != SIG_DFL)
241 sigaddset(catch, i);
242 }
243 }
244
245 static inline void task_sig(struct seq_file *m, struct task_struct *p)
246 {
247 unsigned long flags;
248 sigset_t pending, shpending, blocked, ignored, caught;
249 int num_threads = 0;
250 unsigned long qsize = 0;
251 unsigned long qlim = 0;
252
253 sigemptyset(&pending);
254 sigemptyset(&shpending);
255 sigemptyset(&blocked);
256 sigemptyset(&ignored);
257 sigemptyset(&caught);
258
259 rcu_read_lock();
260 if (lock_task_sighand(p, &flags)) {
261 pending = p->pending.signal;
262 shpending = p->signal->shared_pending.signal;
263 blocked = p->blocked;
264 collect_sigign_sigcatch(p, &ignored, &caught);
265 num_threads = atomic_read(&p->signal->count);
266 qsize = atomic_read(&p->user->sigpending);
267 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
268 unlock_task_sighand(p, &flags);
269 }
270 rcu_read_unlock();
271
272 seq_printf(m, "Threads:\t%d\n", num_threads);
273 seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
274
275 /* render them all */
276 render_sigset_t(m, "SigPnd:\t", &pending);
277 render_sigset_t(m, "ShdPnd:\t", &shpending);
278 render_sigset_t(m, "SigBlk:\t", &blocked);
279 render_sigset_t(m, "SigIgn:\t", &ignored);
280 render_sigset_t(m, "SigCgt:\t", &caught);
281 }
282
283 static void render_cap_t(struct seq_file *m, const char *header,
284 kernel_cap_t *a)
285 {
286 unsigned __capi;
287
288 seq_printf(m, "%s", header);
289 CAP_FOR_EACH_U32(__capi) {
290 seq_printf(m, "%08x",
291 a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
292 }
293 seq_printf(m, "\n");
294 }
295
296 static inline void task_cap(struct seq_file *m, struct task_struct *p)
297 {
298 render_cap_t(m, "CapInh:\t", &p->cap_inheritable);
299 render_cap_t(m, "CapPrm:\t", &p->cap_permitted);
300 render_cap_t(m, "CapEff:\t", &p->cap_effective);
301 }
302
303 static inline void task_context_switch_counts(struct seq_file *m,
304 struct task_struct *p)
305 {
306 seq_printf(m, "voluntary_ctxt_switches:\t%lu\n"
307 "nonvoluntary_ctxt_switches:\t%lu\n",
308 p->nvcsw,
309 p->nivcsw);
310 }
311
312 #define get_blocked_on(t) (-1)
313
314 static inline void show_blocked_on(struct seq_file *m, struct task_struct *p)
315 {
316 pid_t pid = get_blocked_on(p);
317
318 if (pid < 0)
319 return;
320
321 seq_printf(m, "BlckOn: %d\n", pid);
322 }
323
324
325 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
326 struct pid *pid, struct task_struct *task)
327 {
328 struct mm_struct *mm = get_task_mm(task);
329
330 task_name(m, task);
331 task_state(m, ns, pid, task);
332
333 if (mm) {
334 task_mem(m, mm);
335 mmput(mm);
336 }
337 task_sig(m, task);
338 task_cap(m, task);
339 cpuset_task_status_allowed(m, task);
340 #if defined(CONFIG_S390)
341 task_show_regs(m, task);
342 #endif
343 task_context_switch_counts(m, task);
344 show_blocked_on(m, task);
345 return 0;
346 }
347
348 /*
349 * Use precise platform statistics if available:
350 */
351 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
352 static cputime_t task_utime(struct task_struct *p)
353 {
354 return p->utime;
355 }
356
357 static cputime_t task_stime(struct task_struct *p)
358 {
359 return p->stime;
360 }
361 #else
362 static cputime_t task_utime(struct task_struct *p)
363 {
364 clock_t utime = cputime_to_clock_t(p->utime),
365 total = utime + cputime_to_clock_t(p->stime);
366 u64 temp;
367
368 /*
369 * Use CFS's precise accounting:
370 */
371 temp = (u64)nsec_to_clock_t(p->se.sum_exec_runtime);
372
373 if (total) {
374 temp *= utime;
375 do_div(temp, total);
376 }
377 utime = (clock_t)temp;
378
379 p->prev_utime = max(p->prev_utime, clock_t_to_cputime(utime));
380 return p->prev_utime;
381 }
382
383 static cputime_t task_stime(struct task_struct *p)
384 {
385 clock_t stime;
386
387 /*
388 * Use CFS's precise accounting. (we subtract utime from
389 * the total, to make sure the total observed by userspace
390 * grows monotonically - apps rely on that):
391 */
392 stime = nsec_to_clock_t(p->se.sum_exec_runtime) -
393 cputime_to_clock_t(task_utime(p));
394
395 if (stime >= 0)
396 p->prev_stime = max(p->prev_stime, clock_t_to_cputime(stime));
397
398 return p->prev_stime;
399 }
400 #endif
401
402 static cputime_t task_gtime(struct task_struct *p)
403 {
404 return p->gtime;
405 }
406
407 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
408 struct pid *pid, struct task_struct *task, int whole)
409 {
410 unsigned long vsize, eip, esp, wchan = ~0UL;
411 long priority, nice;
412 int tty_pgrp = -1, tty_nr = 0;
413 sigset_t sigign, sigcatch;
414 char state;
415 pid_t ppid = 0, pgid = -1, sid = -1;
416 int num_threads = 0;
417 struct mm_struct *mm;
418 unsigned long long start_time;
419 unsigned long cmin_flt = 0, cmaj_flt = 0;
420 unsigned long min_flt = 0, maj_flt = 0;
421 cputime_t cutime, cstime, utime, stime;
422 cputime_t cgtime, gtime;
423 unsigned long rsslim = 0;
424 char tcomm[sizeof(task->comm)];
425 unsigned long flags;
426
427 state = *get_task_state(task);
428 vsize = eip = esp = 0;
429 mm = get_task_mm(task);
430 if (mm) {
431 vsize = task_vsize(mm);
432 eip = KSTK_EIP(task);
433 esp = KSTK_ESP(task);
434 }
435
436 get_task_comm(tcomm, task);
437
438 sigemptyset(&sigign);
439 sigemptyset(&sigcatch);
440 cutime = cstime = utime = stime = cputime_zero;
441 cgtime = gtime = cputime_zero;
442
443 rcu_read_lock();
444 if (lock_task_sighand(task, &flags)) {
445 struct signal_struct *sig = task->signal;
446
447 if (sig->tty) {
448 tty_pgrp = pid_nr_ns(sig->tty->pgrp, ns);
449 tty_nr = new_encode_dev(tty_devnum(sig->tty));
450 }
451
452 num_threads = atomic_read(&sig->count);
453 collect_sigign_sigcatch(task, &sigign, &sigcatch);
454
455 cmin_flt = sig->cmin_flt;
456 cmaj_flt = sig->cmaj_flt;
457 cutime = sig->cutime;
458 cstime = sig->cstime;
459 cgtime = sig->cgtime;
460 rsslim = sig->rlim[RLIMIT_RSS].rlim_cur;
461
462 /* add up live thread stats at the group level */
463 if (whole) {
464 struct task_struct *t = task;
465 do {
466 min_flt += t->min_flt;
467 maj_flt += t->maj_flt;
468 utime = cputime_add(utime, task_utime(t));
469 stime = cputime_add(stime, task_stime(t));
470 gtime = cputime_add(gtime, task_gtime(t));
471 t = next_thread(t);
472 } while (t != task);
473
474 min_flt += sig->min_flt;
475 maj_flt += sig->maj_flt;
476 utime = cputime_add(utime, sig->utime);
477 stime = cputime_add(stime, sig->stime);
478 gtime = cputime_add(gtime, sig->gtime);
479 }
480
481 sid = task_session_nr_ns(task, ns);
482 ppid = task_tgid_nr_ns(task->real_parent, ns);
483 pgid = task_pgrp_nr_ns(task, ns);
484
485 unlock_task_sighand(task, &flags);
486 }
487 rcu_read_unlock();
488
489 if (!whole || num_threads < 2)
490 wchan = get_wchan(task);
491 if (!whole) {
492 min_flt = task->min_flt;
493 maj_flt = task->maj_flt;
494 utime = task_utime(task);
495 stime = task_stime(task);
496 gtime = task_gtime(task);
497 }
498
499 /* scale priority and nice values from timeslices to -20..20 */
500 /* to make it look like a "normal" Unix priority/nice value */
501 priority = task_prio(task);
502 nice = task_nice(task);
503
504 /* Temporary variable needed for gcc-2.96 */
505 /* convert timespec -> nsec*/
506 start_time =
507 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
508 + task->real_start_time.tv_nsec;
509 /* convert nsec -> ticks */
510 start_time = nsec_to_clock_t(start_time);
511
512 seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
513 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
514 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
515 pid_nr_ns(pid, ns),
516 tcomm,
517 state,
518 ppid,
519 pgid,
520 sid,
521 tty_nr,
522 tty_pgrp,
523 task->flags,
524 min_flt,
525 cmin_flt,
526 maj_flt,
527 cmaj_flt,
528 cputime_to_clock_t(utime),
529 cputime_to_clock_t(stime),
530 cputime_to_clock_t(cutime),
531 cputime_to_clock_t(cstime),
532 priority,
533 nice,
534 num_threads,
535 start_time,
536 vsize,
537 mm ? get_mm_rss(mm) : 0,
538 rsslim,
539 mm ? mm->start_code : 0,
540 mm ? mm->end_code : 0,
541 mm ? mm->start_stack : 0,
542 esp,
543 eip,
544 /* The signal information here is obsolete.
545 * It must be decimal for Linux 2.0 compatibility.
546 * Use /proc/#/status for real-time signals.
547 */
548 task->pending.signal.sig[0] & 0x7fffffffUL,
549 task->blocked.sig[0] & 0x7fffffffUL,
550 sigign .sig[0] & 0x7fffffffUL,
551 sigcatch .sig[0] & 0x7fffffffUL,
552 wchan,
553 0UL,
554 0UL,
555 task->exit_signal,
556 task_cpu(task),
557 task->rt_priority,
558 task->policy,
559 (unsigned long long)delayacct_blkio_ticks(task),
560 cputime_to_clock_t(gtime),
561 cputime_to_clock_t(cgtime));
562 if (mm)
563 mmput(mm);
564 return 0;
565 }
566
567 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
568 struct pid *pid, struct task_struct *task)
569 {
570 return do_task_stat(m, ns, pid, task, 0);
571 }
572
573 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
574 struct pid *pid, struct task_struct *task)
575 {
576 return do_task_stat(m, ns, pid, task, 1);
577 }
578
579 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
580 struct pid *pid, struct task_struct *task)
581 {
582 int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
583 struct mm_struct *mm = get_task_mm(task);
584
585 if (mm) {
586 size = task_statm(mm, &shared, &text, &data, &resident);
587 mmput(mm);
588 }
589 seq_printf(m, "%d %d %d %d %d %d %d\n",
590 size, resident, shared, text, lib, data, 0);
591
592 return 0;
593 }
594
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