fed up with those stupid warnings
[mmotm.git] / fs / proc / array.c
blobbf85811180d070a32ebdc96321f28e9142d848ff
1 /*
2 * linux/fs/proc/array.c
4 * Copyright (C) 1992 by Linus Torvalds
5 * based on ideas by Darren Senn
7 * Fixes:
8 * Michael. K. Johnson: stat,statm extensions.
9 * <johnsonm@stolaf.edu>
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>
17 * Danny ter Haar : added cpuinfo
18 * <dth@cistron.nl>
20 * Alessandro Rubini : profile extension.
21 * <rubini@ipvvis.unipv.it>
23 * Jeff Tranter : added BogoMips field to cpuinfo
24 * <Jeff_Tranter@Mitel.COM>
26 * Bruno Haible : remove 4K limit for the maps file
27 * <haible@ma2s2.mathematik.uni-karlsruhe.de>
29 * Yves Arrouye : remove removal of trailing spaces in get_array.
30 * <Yves.Arrouye@marin.fdn.fr>
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>
39 * aeb@cwi.nl : /proc/partitions
42 * Alan Cox : security fixes.
43 * <alan@lxorguk.ukuu.org.uk>
45 * Al Viro : safe handling of mm_struct
47 * Gerhard Wichert : added BIGMEM support
48 * Siemens AG <Gerhard.Wichert@pdb.siemens.de>
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.
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/fdtable.h>
77 #include <linux/times.h>
78 #include <linux/cpuset.h>
79 #include <linux/rcupdate.h>
80 #include <linux/delayacct.h>
81 #include <linux/seq_file.h>
82 #include <linux/pid_namespace.h>
83 #include <linux/ptrace.h>
84 #include <linux/utrace.h>
85 #include <linux/tracehook.h>
86 #include <linux/swapops.h>
88 #include <asm/pgtable.h>
89 #include <asm/processor.h>
90 #include "internal.h"
92 static inline void task_name(struct seq_file *m, struct task_struct *p)
94 int i;
95 char *buf, *end;
96 char *name;
97 char tcomm[sizeof(p->comm)];
99 get_task_comm(tcomm, p);
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;
119 if (c == '\n') {
120 *buf++ = '\\';
121 if (buf < end)
122 *buf++ = 'n';
123 continue;
125 buf++;
127 m->count = buf - m->buf;
128 seq_printf(m, "\n");
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.
137 static const char *task_state_array[] = {
138 "R (running)", /* 0 */
139 "S (sleeping)", /* 1 */
140 "D (disk sleep)", /* 2 */
141 "T (stopped)", /* 4 */
142 "T (tracing stop)", /* 8 */
143 "Z (zombie)", /* 16 */
144 "X (dead)" /* 32 */
147 static inline const char *get_task_state(struct task_struct *tsk)
149 unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
150 const char **p = &task_state_array[0];
152 while (state) {
153 p++;
154 state >>= 1;
156 return *p;
159 static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
160 struct pid *pid, struct task_struct *p)
162 struct group_info *group_info;
163 int g;
164 struct fdtable *fdt = NULL;
165 const struct cred *cred;
166 pid_t ppid, tpid;
168 rcu_read_lock();
169 ppid = pid_alive(p) ?
170 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
171 tpid = 0;
172 if (pid_alive(p)) {
173 struct task_struct *tracer = tracehook_tracer_task(p);
174 if (tracer)
175 tpid = task_pid_nr_ns(tracer, ns);
177 cred = get_cred((struct cred *) __task_cred(p));
178 seq_printf(m,
179 "State:\t%s\n"
180 "Tgid:\t%d\n"
181 "Pid:\t%d\n"
182 "PPid:\t%d\n"
183 "TracerPid:\t%d\n"
184 "Uid:\t%d\t%d\t%d\t%d\n"
185 "Gid:\t%d\t%d\t%d\t%d\n",
186 get_task_state(p),
187 task_tgid_nr_ns(p, ns),
188 pid_nr_ns(pid, ns),
189 ppid, tpid,
190 cred->uid, cred->euid, cred->suid, cred->fsuid,
191 cred->gid, cred->egid, cred->sgid, cred->fsgid);
193 task_utrace_proc_status(m, p);
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();
204 group_info = cred->group_info;
205 task_unlock(p);
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);
211 seq_printf(m, "\n");
214 static void render_sigset_t(struct seq_file *m, const char *header,
215 sigset_t *set)
217 int i;
219 seq_printf(m, "%s", header);
221 i = _NSIG;
222 do {
223 int x = 0;
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);
233 seq_printf(m, "\n");
236 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
237 sigset_t *catch)
239 struct k_sigaction *k;
240 int i;
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);
251 static inline void task_sig(struct seq_file *m, struct task_struct *p)
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;
259 sigemptyset(&pending);
260 sigemptyset(&shpending);
261 sigemptyset(&blocked);
262 sigemptyset(&ignored);
263 sigemptyset(&caught);
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 = atomic_read(&p->signal->count);
271 qsize = atomic_read(&__task_cred(p)->user->sigpending);
272 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
273 unlock_task_sighand(p, &flags);
276 seq_printf(m, "Threads:\t%d\n", num_threads);
277 seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
279 /* render them all */
280 render_sigset_t(m, "SigPnd:\t", &pending);
281 render_sigset_t(m, "ShdPnd:\t", &shpending);
282 render_sigset_t(m, "SigBlk:\t", &blocked);
283 render_sigset_t(m, "SigIgn:\t", &ignored);
284 render_sigset_t(m, "SigCgt:\t", &caught);
287 static void render_cap_t(struct seq_file *m, const char *header,
288 kernel_cap_t *a)
290 unsigned __capi;
292 seq_printf(m, "%s", header);
293 CAP_FOR_EACH_U32(__capi) {
294 seq_printf(m, "%08x",
295 a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
297 seq_printf(m, "\n");
300 static inline void task_cap(struct seq_file *m, struct task_struct *p)
302 const struct cred *cred;
303 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
305 rcu_read_lock();
306 cred = __task_cred(p);
307 cap_inheritable = cred->cap_inheritable;
308 cap_permitted = cred->cap_permitted;
309 cap_effective = cred->cap_effective;
310 cap_bset = cred->cap_bset;
311 rcu_read_unlock();
313 render_cap_t(m, "CapInh:\t", &cap_inheritable);
314 render_cap_t(m, "CapPrm:\t", &cap_permitted);
315 render_cap_t(m, "CapEff:\t", &cap_effective);
316 render_cap_t(m, "CapBnd:\t", &cap_bset);
319 static inline void task_context_switch_counts(struct seq_file *m,
320 struct task_struct *p)
322 seq_printf(m, "voluntary_ctxt_switches:\t%lu\n"
323 "nonvoluntary_ctxt_switches:\t%lu\n",
324 p->nvcsw,
325 p->nivcsw);
328 #ifdef CONFIG_MMU
330 struct stack_stats {
331 struct vm_area_struct *vma;
332 unsigned long startpage;
333 unsigned long usage;
336 static int stack_usage_pte_range(pmd_t *pmd, unsigned long addr,
337 unsigned long end, struct mm_walk *walk)
339 struct stack_stats *ss = walk->private;
340 struct vm_area_struct *vma = ss->vma;
341 pte_t *pte, ptent;
342 spinlock_t *ptl;
343 int ret = 0;
345 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
346 for (; addr != end; pte++, addr += PAGE_SIZE) {
347 ptent = *pte;
349 #ifdef CONFIG_STACK_GROWSUP
350 if (pte_present(ptent) || is_swap_pte(ptent))
351 ss->usage = addr - ss->startpage + PAGE_SIZE;
352 #else
353 if (pte_present(ptent) || is_swap_pte(ptent)) {
354 ss->usage = ss->startpage - addr + PAGE_SIZE;
355 pte++;
356 ret = 1;
357 break;
359 #endif
361 pte_unmap_unlock(pte - 1, ptl);
362 cond_resched();
363 return ret;
366 static inline unsigned long get_stack_usage_in_bytes(struct vm_area_struct *vma,
367 struct task_struct *task)
369 struct stack_stats ss;
370 struct mm_walk stack_walk = {
371 .pmd_entry = stack_usage_pte_range,
372 .mm = vma->vm_mm,
373 .private = &ss,
376 if (!vma->vm_mm || is_vm_hugetlb_page(vma))
377 return 0;
379 ss.vma = vma;
380 ss.startpage = task->stack_start & PAGE_MASK;
381 ss.usage = 0;
383 #ifdef CONFIG_STACK_GROWSUP
384 walk_page_range(KSTK_ESP(task) & PAGE_MASK, vma->vm_end,
385 &stack_walk);
386 #else
387 walk_page_range(vma->vm_start, (KSTK_ESP(task) & PAGE_MASK) + PAGE_SIZE,
388 &stack_walk);
389 #endif
390 return ss.usage;
393 static inline void task_show_stack_usage(struct seq_file *m,
394 struct task_struct *task)
396 struct vm_area_struct *vma;
397 struct mm_struct *mm = get_task_mm(task);
399 if (mm) {
400 down_read(&mm->mmap_sem);
401 vma = find_vma(mm, task->stack_start);
402 if (vma)
403 seq_printf(m, "Stack usage:\t%lu kB\n",
404 get_stack_usage_in_bytes(vma, task) >> 10);
406 up_read(&mm->mmap_sem);
407 mmput(mm);
410 #else
411 static void task_show_stack_usage(struct seq_file *m, struct task_struct *task)
414 #endif /* CONFIG_MMU */
416 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
418 seq_printf(m, "Cpus_allowed:\t");
419 seq_cpumask(m, &task->cpus_allowed);
420 seq_printf(m, "\n");
421 seq_printf(m, "Cpus_allowed_list:\t");
422 seq_cpumask_list(m, &task->cpus_allowed);
423 seq_printf(m, "\n");
426 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
427 struct pid *pid, struct task_struct *task)
429 struct mm_struct *mm = get_task_mm(task);
431 task_name(m, task);
432 task_state(m, ns, pid, task);
434 if (mm) {
435 task_mem(m, mm);
436 mmput(mm);
438 task_sig(m, task);
439 task_cap(m, task);
440 task_cpus_allowed(m, task);
441 cpuset_task_status_allowed(m, task);
442 #if defined(CONFIG_S390)
443 task_show_regs(m, task);
444 #endif
445 task_context_switch_counts(m, task);
446 task_show_stack_usage(m, task);
447 return 0;
450 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
451 struct pid *pid, struct task_struct *task, int whole)
453 unsigned long vsize, eip, esp, wchan = ~0UL;
454 long priority, nice;
455 int tty_pgrp = -1, tty_nr = 0;
456 sigset_t sigign, sigcatch;
457 char state;
458 pid_t ppid = 0, pgid = -1, sid = -1;
459 int num_threads = 0;
460 int permitted;
461 struct mm_struct *mm;
462 unsigned long long start_time;
463 unsigned long cmin_flt = 0, cmaj_flt = 0;
464 unsigned long min_flt = 0, maj_flt = 0;
465 cputime_t cutime, cstime, utime, stime;
466 cputime_t cgtime, gtime;
467 unsigned long rsslim = 0;
468 char tcomm[sizeof(task->comm)];
469 unsigned long flags;
471 state = *get_task_state(task);
472 vsize = eip = esp = 0;
473 permitted = ptrace_may_access(task, PTRACE_MODE_READ);
474 mm = get_task_mm(task);
475 if (mm) {
476 vsize = task_vsize(mm);
477 if (permitted) {
478 eip = KSTK_EIP(task);
479 esp = KSTK_ESP(task);
483 get_task_comm(tcomm, task);
485 sigemptyset(&sigign);
486 sigemptyset(&sigcatch);
487 cutime = cstime = utime = stime = cputime_zero;
488 cgtime = gtime = cputime_zero;
490 if (lock_task_sighand(task, &flags)) {
491 struct signal_struct *sig = task->signal;
493 if (sig->tty) {
494 struct pid *pgrp = tty_get_pgrp(sig->tty);
495 tty_pgrp = pid_nr_ns(pgrp, ns);
496 put_pid(pgrp);
497 tty_nr = new_encode_dev(tty_devnum(sig->tty));
500 num_threads = atomic_read(&sig->count);
501 collect_sigign_sigcatch(task, &sigign, &sigcatch);
503 cmin_flt = sig->cmin_flt;
504 cmaj_flt = sig->cmaj_flt;
505 cutime = sig->cutime;
506 cstime = sig->cstime;
507 cgtime = sig->cgtime;
508 rsslim = sig->rlim[RLIMIT_RSS].rlim_cur;
510 /* add up live thread stats at the group level */
511 if (whole) {
512 struct task_cputime cputime;
513 struct task_struct *t = task;
514 do {
515 min_flt += t->min_flt;
516 maj_flt += t->maj_flt;
517 gtime = cputime_add(gtime, task_gtime(t));
518 t = next_thread(t);
519 } while (t != task);
521 min_flt += sig->min_flt;
522 maj_flt += sig->maj_flt;
523 thread_group_cputime(task, &cputime);
524 utime = cputime.utime;
525 stime = cputime.stime;
526 gtime = cputime_add(gtime, sig->gtime);
529 sid = task_session_nr_ns(task, ns);
530 ppid = task_tgid_nr_ns(task->real_parent, ns);
531 pgid = task_pgrp_nr_ns(task, ns);
533 unlock_task_sighand(task, &flags);
536 if (permitted && (!whole || num_threads < 2))
537 wchan = get_wchan(task);
538 if (!whole) {
539 min_flt = task->min_flt;
540 maj_flt = task->maj_flt;
541 utime = task_utime(task);
542 stime = task_stime(task);
543 gtime = task_gtime(task);
546 /* scale priority and nice values from timeslices to -20..20 */
547 /* to make it look like a "normal" Unix priority/nice value */
548 priority = task_prio(task);
549 nice = task_nice(task);
551 /* Temporary variable needed for gcc-2.96 */
552 /* convert timespec -> nsec*/
553 start_time =
554 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
555 + task->real_start_time.tv_nsec;
556 /* convert nsec -> ticks */
557 start_time = nsec_to_clock_t(start_time);
559 seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
560 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
561 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
562 pid_nr_ns(pid, ns),
563 tcomm,
564 state,
565 ppid,
566 pgid,
567 sid,
568 tty_nr,
569 tty_pgrp,
570 task->flags,
571 min_flt,
572 cmin_flt,
573 maj_flt,
574 cmaj_flt,
575 cputime_to_clock_t(utime),
576 cputime_to_clock_t(stime),
577 cputime_to_clock_t(cutime),
578 cputime_to_clock_t(cstime),
579 priority,
580 nice,
581 num_threads,
582 start_time,
583 vsize,
584 mm ? get_mm_rss(mm) : 0,
585 rsslim,
586 mm ? mm->start_code : 0,
587 mm ? mm->end_code : 0,
588 (permitted) ? task->stack_start : 0,
589 esp,
590 eip,
591 /* The signal information here is obsolete.
592 * It must be decimal for Linux 2.0 compatibility.
593 * Use /proc/#/status for real-time signals.
595 task->pending.signal.sig[0] & 0x7fffffffUL,
596 task->blocked.sig[0] & 0x7fffffffUL,
597 sigign .sig[0] & 0x7fffffffUL,
598 sigcatch .sig[0] & 0x7fffffffUL,
599 wchan,
600 0UL,
601 0UL,
602 task->exit_signal,
603 task_cpu(task),
604 task->rt_priority,
605 task->policy,
606 (unsigned long long)delayacct_blkio_ticks(task),
607 cputime_to_clock_t(gtime),
608 cputime_to_clock_t(cgtime));
609 if (mm)
610 mmput(mm);
611 return 0;
614 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
615 struct pid *pid, struct task_struct *task)
617 return do_task_stat(m, ns, pid, task, 0);
620 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
621 struct pid *pid, struct task_struct *task)
623 return do_task_stat(m, ns, pid, task, 1);
626 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
627 struct pid *pid, struct task_struct *task)
629 int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
630 struct mm_struct *mm = get_task_mm(task);
632 if (mm) {
633 size = task_statm(mm, &shared, &text, &data, &resident);
634 mmput(mm);
636 seq_printf(m, "%d %d %d %d %d %d %d\n",
637 size, resident, shared, text, lib, data, 0);
639 return 0;