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