680c913575f0bd41ea7374929258d21cecb5f75d
[linux-2.6.git] / fs / proc / array.c
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) \
87 do { memcpy(buffer, string, strlen(string)); \
88      buffer += strlen(string); } while (0)
89
90 static 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  */
131 static 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
141 static 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
159 static 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                 "Tgid:\t%d\n"
169                 "Pid:\t%d\n"
170                 "PPid:\t%d\n"
171                 "TracerPid:\t%d\n"
172                 "Uid:\t%d\t%d\t%d\t%d\n"
173                 "Gid:\t%d\t%d\t%d\t%d\n",
174                 get_task_state(p),
175                 p->tgid, p->pid,
176                 pid_alive(p) ? rcu_dereference(p->real_parent)->tgid : 0,
177                 pid_alive(p) && p->ptrace ? rcu_dereference(p->parent)->pid : 0,
178                 p->uid, p->euid, p->suid, p->fsuid,
179                 p->gid, p->egid, p->sgid, p->fsgid);
180
181         task_lock(p);
182         if (p->files)
183                 fdt = files_fdtable(p->files);
184         buffer += sprintf(buffer,
185                 "FDSize:\t%d\n"
186                 "Groups:\t",
187                 fdt ? fdt->max_fds : 0);
188         rcu_read_unlock();
189
190         group_info = p->group_info;
191         get_group_info(group_info);
192         task_unlock(p);
193
194         for (g = 0; g < min(group_info->ngroups,NGROUPS_SMALL); g++)
195                 buffer += sprintf(buffer, "%d ", GROUP_AT(group_info,g));
196         put_group_info(group_info);
197
198         buffer += sprintf(buffer, "\n");
199         return buffer;
200 }
201
202 static char * render_sigset_t(const char *header, sigset_t *set, char *buffer)
203 {
204         int i, len;
205
206         len = strlen(header);
207         memcpy(buffer, header, len);
208         buffer += len;
209
210         i = _NSIG;
211         do {
212                 int x = 0;
213
214                 i -= 4;
215                 if (sigismember(set, i+1)) x |= 1;
216                 if (sigismember(set, i+2)) x |= 2;
217                 if (sigismember(set, i+3)) x |= 4;
218                 if (sigismember(set, i+4)) x |= 8;
219                 *buffer++ = (x < 10 ? '0' : 'a' - 10) + x;
220         } while (i >= 4);
221
222         *buffer++ = '\n';
223         *buffer = 0;
224         return buffer;
225 }
226
227 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
228                                     sigset_t *catch)
229 {
230         struct k_sigaction *k;
231         int i;
232
233         k = p->sighand->action;
234         for (i = 1; i <= _NSIG; ++i, ++k) {
235                 if (k->sa.sa_handler == SIG_IGN)
236                         sigaddset(ign, i);
237                 else if (k->sa.sa_handler != SIG_DFL)
238                         sigaddset(catch, i);
239         }
240 }
241
242 static inline char * task_sig(struct task_struct *p, char *buffer)
243 {
244         unsigned long flags;
245         sigset_t pending, shpending, blocked, ignored, caught;
246         int num_threads = 0;
247         unsigned long qsize = 0;
248         unsigned long qlim = 0;
249
250         sigemptyset(&pending);
251         sigemptyset(&shpending);
252         sigemptyset(&blocked);
253         sigemptyset(&ignored);
254         sigemptyset(&caught);
255
256         rcu_read_lock();
257         if (lock_task_sighand(p, &flags)) {
258                 pending = p->pending.signal;
259                 shpending = p->signal->shared_pending.signal;
260                 blocked = p->blocked;
261                 collect_sigign_sigcatch(p, &ignored, &caught);
262                 num_threads = atomic_read(&p->signal->count);
263                 qsize = atomic_read(&p->user->sigpending);
264                 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
265                 unlock_task_sighand(p, &flags);
266         }
267         rcu_read_unlock();
268
269         buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
270         buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim);
271
272         /* render them all */
273         buffer = render_sigset_t("SigPnd:\t", &pending, buffer);
274         buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer);
275         buffer = render_sigset_t("SigBlk:\t", &blocked, buffer);
276         buffer = render_sigset_t("SigIgn:\t", &ignored, buffer);
277         buffer = render_sigset_t("SigCgt:\t", &caught, buffer);
278
279         return buffer;
280 }
281
282 static inline char *task_cap(struct task_struct *p, char *buffer)
283 {
284     return buffer + sprintf(buffer, "CapInh:\t%016x\n"
285                             "CapPrm:\t%016x\n"
286                             "CapEff:\t%016x\n",
287                             cap_t(p->cap_inheritable),
288                             cap_t(p->cap_permitted),
289                             cap_t(p->cap_effective));
290 }
291
292 int proc_pid_status(struct task_struct *task, char * buffer)
293 {
294         char * orig = buffer;
295         struct mm_struct *mm = get_task_mm(task);
296
297         buffer = task_name(task, buffer);
298         buffer = task_state(task, buffer);
299  
300         if (mm) {
301                 buffer = task_mem(mm, buffer);
302                 mmput(mm);
303         }
304         buffer = task_sig(task, buffer);
305         buffer = task_cap(task, buffer);
306         buffer = cpuset_task_status_allowed(task, buffer);
307 #if defined(CONFIG_S390)
308         buffer = task_show_regs(task, buffer);
309 #endif
310         return buffer - orig;
311 }
312
313 static clock_t task_utime(struct task_struct *p)
314 {
315         clock_t utime = cputime_to_clock_t(p->utime),
316                 total = utime + cputime_to_clock_t(p->stime);
317         u64 temp;
318
319         /*
320          * Use CFS's precise accounting:
321          */
322         temp = (u64)nsec_to_clock_t(p->se.sum_exec_runtime);
323
324         if (total) {
325                 temp *= utime;
326                 do_div(temp, total);
327         }
328         utime = (clock_t)temp;
329
330         return utime;
331 }
332
333 static clock_t task_stime(struct task_struct *p)
334 {
335         clock_t stime = cputime_to_clock_t(p->stime);
336
337         /*
338          * Use CFS's precise accounting. (we subtract utime from
339          * the total, to make sure the total observed by userspace
340          * grows monotonically - apps rely on that):
341          */
342         stime = nsec_to_clock_t(p->se.sum_exec_runtime) - task_utime(p);
343
344         return stime;
345 }
346
347
348 static int do_task_stat(struct task_struct *task, char * buffer, int whole)
349 {
350         unsigned long vsize, eip, esp, wchan = ~0UL;
351         long priority, nice;
352         int tty_pgrp = -1, tty_nr = 0;
353         sigset_t sigign, sigcatch;
354         char state;
355         int res;
356         pid_t ppid = 0, pgid = -1, sid = -1;
357         int num_threads = 0;
358         struct mm_struct *mm;
359         unsigned long long start_time;
360         unsigned long cmin_flt = 0, cmaj_flt = 0;
361         unsigned long  min_flt = 0,  maj_flt = 0;
362         cputime_t cutime, cstime;
363         clock_t utime, stime;
364         unsigned long rsslim = 0;
365         char tcomm[sizeof(task->comm)];
366         unsigned long flags;
367
368         state = *get_task_state(task);
369         vsize = eip = esp = 0;
370         mm = get_task_mm(task);
371         if (mm) {
372                 vsize = task_vsize(mm);
373                 eip = KSTK_EIP(task);
374                 esp = KSTK_ESP(task);
375         }
376
377         get_task_comm(tcomm, task);
378
379         sigemptyset(&sigign);
380         sigemptyset(&sigcatch);
381         cutime = cstime = cputime_zero;
382         utime = stime = 0;
383
384         rcu_read_lock();
385         if (lock_task_sighand(task, &flags)) {
386                 struct signal_struct *sig = task->signal;
387
388                 if (sig->tty) {
389                         tty_pgrp = pid_nr(sig->tty->pgrp);
390                         tty_nr = new_encode_dev(tty_devnum(sig->tty));
391                 }
392
393                 num_threads = atomic_read(&sig->count);
394                 collect_sigign_sigcatch(task, &sigign, &sigcatch);
395
396                 cmin_flt = sig->cmin_flt;
397                 cmaj_flt = sig->cmaj_flt;
398                 cutime = sig->cutime;
399                 cstime = sig->cstime;
400                 rsslim = sig->rlim[RLIMIT_RSS].rlim_cur;
401
402                 /* add up live thread stats at the group level */
403                 if (whole) {
404                         struct task_struct *t = task;
405                         do {
406                                 min_flt += t->min_flt;
407                                 maj_flt += t->maj_flt;
408                                 utime += task_utime(t);
409                                 stime += task_stime(t);
410                                 t = next_thread(t);
411                         } while (t != task);
412
413                         min_flt += sig->min_flt;
414                         maj_flt += sig->maj_flt;
415                         utime += cputime_to_clock_t(sig->utime);
416                         stime += cputime_to_clock_t(sig->stime);
417                 }
418
419                 sid = signal_session(sig);
420                 pgid = process_group(task);
421                 ppid = rcu_dereference(task->real_parent)->tgid;
422
423                 unlock_task_sighand(task, &flags);
424         }
425         rcu_read_unlock();
426
427         if (!whole || num_threads<2)
428                 wchan = get_wchan(task);
429         if (!whole) {
430                 min_flt = task->min_flt;
431                 maj_flt = task->maj_flt;
432                 utime = task_utime(task);
433                 stime = task_stime(task);
434         }
435
436         /* scale priority and nice values from timeslices to -20..20 */
437         /* to make it look like a "normal" Unix priority/nice value  */
438         priority = task_prio(task);
439         nice = task_nice(task);
440
441         /* Temporary variable needed for gcc-2.96 */
442         /* convert timespec -> nsec*/
443         start_time =
444                 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
445                                 + task->real_start_time.tv_nsec;
446         /* convert nsec -> ticks */
447         start_time = nsec_to_clock_t(start_time);
448
449         res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %u %lu \
450 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
451 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu\n",
452                 task->pid,
453                 tcomm,
454                 state,
455                 ppid,
456                 pgid,
457                 sid,
458                 tty_nr,
459                 tty_pgrp,
460                 task->flags,
461                 min_flt,
462                 cmin_flt,
463                 maj_flt,
464                 cmaj_flt,
465                 utime,
466                 stime,
467                 cputime_to_clock_t(cutime),
468                 cputime_to_clock_t(cstime),
469                 priority,
470                 nice,
471                 num_threads,
472                 start_time,
473                 vsize,
474                 mm ? get_mm_rss(mm) : 0,
475                 rsslim,
476                 mm ? mm->start_code : 0,
477                 mm ? mm->end_code : 0,
478                 mm ? mm->start_stack : 0,
479                 esp,
480                 eip,
481                 /* The signal information here is obsolete.
482                  * It must be decimal for Linux 2.0 compatibility.
483                  * Use /proc/#/status for real-time signals.
484                  */
485                 task->pending.signal.sig[0] & 0x7fffffffUL,
486                 task->blocked.sig[0] & 0x7fffffffUL,
487                 sigign      .sig[0] & 0x7fffffffUL,
488                 sigcatch    .sig[0] & 0x7fffffffUL,
489                 wchan,
490                 0UL,
491                 0UL,
492                 task->exit_signal,
493                 task_cpu(task),
494                 task->rt_priority,
495                 task->policy,
496                 (unsigned long long)delayacct_blkio_ticks(task));
497         if(mm)
498                 mmput(mm);
499         return res;
500 }
501
502 int proc_tid_stat(struct task_struct *task, char * buffer)
503 {
504         return do_task_stat(task, buffer, 0);
505 }
506
507 int proc_tgid_stat(struct task_struct *task, char * buffer)
508 {
509         return do_task_stat(task, buffer, 1);
510 }
511
512 int proc_pid_statm(struct task_struct *task, char *buffer)
513 {
514         int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
515         struct mm_struct *mm = get_task_mm(task);
516         
517         if (mm) {
518                 size = task_statm(mm, &shared, &text, &data, &resident);
519                 mmput(mm);
520         }
521
522         return sprintf(buffer,"%d %d %d %d %d %d %d\n",
523                        size, resident, shared, text, lib, data, 0);
524 }