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/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
  81 #include <asm/pgtable.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 static inline char *task_context_switch_counts(struct task_struct *p,
 293                                                 char *buffer)
 294 {
 295         return buffer + sprintf(buffer, "voluntary_ctxt_switches:\t%lu\n"
 296                             "nonvoluntary_ctxt_switches:\t%lu\n",
 297                             p->nvcsw,
 298                             p->nivcsw);
 299 }
 300
 301 int proc_pid_status(struct task_struct *task, char *buffer)
 302 {
 303         char *orig = buffer;
 304         struct mm_struct *mm = get_task_mm(task);
 305
 306         buffer = task_name(task, buffer);
 307         buffer = task_state(task, buffer);
 308
 309         if (mm) {
 310                 buffer = task_mem(mm, buffer);
 311                 mmput(mm);
 312         }
 313         buffer = task_sig(task, buffer);
 314         buffer = task_cap(task, buffer);
 315         buffer = cpuset_task_status_allowed(task, buffer);
 316 #if defined(CONFIG_S390)
 317         buffer = task_show_regs(task, buffer);
 318 #endif
 319         buffer = task_context_switch_counts(task, buffer);
 320         return buffer - orig;
 321 }
 322
 323 /*
 324  * Use precise platform statistics if available:
 325  */
 326 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 327 static cputime_t task_utime(struct task_struct *p)
 328 {
 329         return p->utime;
 330 }
 331
 332 static cputime_t task_stime(struct task_struct *p)
 333 {
 334         return p->stime;
 335 }
 336 #else
 337 static cputime_t task_utime(struct task_struct *p)
 338 {
 339         clock_t utime = cputime_to_clock_t(p->utime),
 340                 total = utime + cputime_to_clock_t(p->stime);
 341         u64 temp;
 342
 343         /*
 344          * Use CFS's precise accounting:
 345          */
 346         temp = (u64)nsec_to_clock_t(p->se.sum_exec_runtime);
 347
 348         if (total) {
 349                 temp *= utime;
 350                 do_div(temp, total);
 351         }
 352         utime = (clock_t)temp;
 353
 354         return clock_t_to_cputime(utime);
 355 }
 356
 357 static cputime_t task_stime(struct task_struct *p)
 358 {
 359         clock_t stime;
 360
 361         /*
 362          * Use CFS's precise accounting. (we subtract utime from
 363          * the total, to make sure the total observed by userspace
 364          * grows monotonically - apps rely on that):
 365          */
 366         stime = nsec_to_clock_t(p->se.sum_exec_runtime) -
 367                         cputime_to_clock_t(task_utime(p));
 368
 369         return clock_t_to_cputime(stime);
 370 }
 371 #endif
 372
 373 static int do_task_stat(struct task_struct *task, char *buffer, int whole)
 374 {
 375         unsigned long vsize, eip, esp, wchan = ~0UL;
 376         long priority, nice;
 377         int tty_pgrp = -1, tty_nr = 0;
 378         sigset_t sigign, sigcatch;
 379         char state;
 380         int res;
 381         pid_t ppid = 0, pgid = -1, sid = -1;
 382         int num_threads = 0;
 383         struct mm_struct *mm;
 384         unsigned long long start_time;
 385         unsigned long cmin_flt = 0, cmaj_flt = 0;
 386         unsigned long  min_flt = 0,  maj_flt = 0;
 387         cputime_t cutime, cstime, utime, stime;
 388         unsigned long rsslim = 0;
 389         char tcomm[sizeof(task->comm)];
 390         unsigned long flags;
 391
 392         state = *get_task_state(task);
 393         vsize = eip = esp = 0;
 394         mm = get_task_mm(task);
 395         if (mm) {
 396                 vsize = task_vsize(mm);
 397                 eip = KSTK_EIP(task);
 398                 esp = KSTK_ESP(task);
 399         }
 400
 401         get_task_comm(tcomm, task);
 402
 403         sigemptyset(&sigign);
 404         sigemptyset(&sigcatch);
 405         cutime = cstime = utime = stime = cputime_zero;
 406
 407         rcu_read_lock();
 408         if (lock_task_sighand(task, &flags)) {
 409                 struct signal_struct *sig = task->signal;
 410
 411                 if (sig->tty) {
 412                         tty_pgrp = pid_nr(sig->tty->pgrp);
 413                         tty_nr = new_encode_dev(tty_devnum(sig->tty));
 414                 }
 415
 416                 num_threads = atomic_read(&sig->count);
 417                 collect_sigign_sigcatch(task, &sigign, &sigcatch);
 418
 419                 cmin_flt = sig->cmin_flt;
 420                 cmaj_flt = sig->cmaj_flt;
 421                 cutime = sig->cutime;
 422                 cstime = sig->cstime;
 423                 rsslim = sig->rlim[RLIMIT_RSS].rlim_cur;
 424
 425                 /* add up live thread stats at the group level */
 426                 if (whole) {
 427                         struct task_struct *t = task;
 428                         do {
 429                                 min_flt += t->min_flt;
 430                                 maj_flt += t->maj_flt;
 431                                 utime = cputime_add(utime, task_utime(t));
 432                                 stime = cputime_add(stime, task_stime(t));
 433                                 t = next_thread(t);
 434                         } while (t != task);
 435
 436                         min_flt += sig->min_flt;
 437                         maj_flt += sig->maj_flt;
 438                         utime = cputime_add(utime, sig->utime);
 439                         stime = cputime_add(stime, sig->stime);
 440                 }
 441
 442                 sid = signal_session(sig);
 443                 pgid = process_group(task);
 444                 ppid = rcu_dereference(task->real_parent)->tgid;
 445
 446                 unlock_task_sighand(task, &flags);
 447         }
 448         rcu_read_unlock();
 449
 450         if (!whole || num_threads < 2)
 451                 wchan = get_wchan(task);
 452         if (!whole) {
 453                 min_flt = task->min_flt;
 454                 maj_flt = task->maj_flt;
 455                 utime = task_utime(task);
 456                 stime = task_stime(task);
 457         }
 458
 459         /* scale priority and nice values from timeslices to -20..20 */
 460         /* to make it look like a "normal" Unix priority/nice value  */
 461         priority = task_prio(task);
 462         nice = task_nice(task);
 463
 464         /* Temporary variable needed for gcc-2.96 */
 465         /* convert timespec -> nsec*/
 466         start_time =
 467                 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
 468                                 + task->real_start_time.tv_nsec;
 469         /* convert nsec -> ticks */
 470         start_time = nsec_to_clock_t(start_time);
 471
 472         res = sprintf(buffer, "%d (%s) %c %d %d %d %d %d %u %lu \
 473 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
 474 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu\n",
 475                 task->pid,
 476                 tcomm,
 477                 state,
 478                 ppid,
 479                 pgid,
 480                 sid,
 481                 tty_nr,
 482                 tty_pgrp,
 483                 task->flags,
 484                 min_flt,
 485                 cmin_flt,
 486                 maj_flt,
 487                 cmaj_flt,
 488                 cputime_to_clock_t(utime),
 489                 cputime_to_clock_t(stime),
 490                 cputime_to_clock_t(cutime),
 491                 cputime_to_clock_t(cstime),
 492                 priority,
 493                 nice,
 494                 num_threads,
 495                 start_time,
 496                 vsize,
 497                 mm ? get_mm_rss(mm) : 0,
 498                 rsslim,
 499                 mm ? mm->start_code : 0,
 500                 mm ? mm->end_code : 0,
 501                 mm ? mm->start_stack : 0,
 502                 esp,
 503                 eip,
 504                 /* The signal information here is obsolete.
 505                  * It must be decimal for Linux 2.0 compatibility.
 506                  * Use /proc/#/status for real-time signals.
 507                  */
 508                 task->pending.signal.sig[0] & 0x7fffffffUL,
 509                 task->blocked.sig[0] & 0x7fffffffUL,
 510                 sigign      .sig[0] & 0x7fffffffUL,
 511                 sigcatch    .sig[0] & 0x7fffffffUL,
 512                 wchan,
 513                 0UL,
 514                 0UL,
 515                 task->exit_signal,
 516                 task_cpu(task),
 517                 task->rt_priority,
 518                 task->policy,
 519                 (unsigned long long)delayacct_blkio_ticks(task));
 520         if (mm)
 521                 mmput(mm);
 522         return res;
 523 }
 524
 525 int proc_tid_stat(struct task_struct *task, char *buffer)
 526 {
 527         return do_task_stat(task, buffer, 0);
 528 }
 529
 530 int proc_tgid_stat(struct task_struct *task, char *buffer)
 531 {
 532         return do_task_stat(task, buffer, 1);
 533 }
 534
 535 int proc_pid_statm(struct task_struct *task, char *buffer)
 536 {
 537         int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
 538         struct mm_struct *mm = get_task_mm(task);
 539
 540         if (mm) {
 541                 size = task_statm(mm, &shared, &text, &data, &resident);
 542                 mmput(mm);
 543         }
 544
 545         return sprintf(buffer, "%d %d %d %d %d %d %d\n",
 546                        size, resident, shared, text, lib, data, 0);
 547 }