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 #include <linux/pid_namespace.h>
  81
  82 #include <asm/pgtable.h>
  83 #include <asm/processor.h>
  84 #include "internal.h"
  85
  86 /* Gcc optimizes away "strlen(x)" for constant x */
  87 #define ADDBUF(buffer, string) \
  88 do { memcpy(buffer, string, strlen(string)); \
  89      buffer += strlen(string); } while (0)
  90
  91 static inline char *task_name(struct task_struct *p, char *buf)
  92 {
  93         int i;
  94         char *name;
  95         char tcomm[sizeof(p->comm)];
  96
  97         get_task_comm(tcomm, p);
  98
  99         ADDBUF(buf, "Name:\t");
 100         name = tcomm;
 101         i = sizeof(tcomm);
 102         do {
 103                 unsigned char c = *name;
 104                 name++;
 105                 i--;
 106                 *buf = c;
 107                 if (!c)
 108                         break;
 109                 if (c == '\\') {
 110                         buf[1] = c;
 111                         buf += 2;
 112                         continue;
 113                 }
 114                 if (c == '\n') {
 115                         buf[0] = '\\';
 116                         buf[1] = 'n';
 117                         buf += 2;
 118                         continue;
 119                 }
 120                 buf++;
 121         } while (i);
 122         *buf = '\n';
 123         return buf+1;
 124 }
 125
 126 /*
 127  * The task state array is a strange "bitmap" of
 128  * reasons to sleep. Thus "running" is zero, and
 129  * you can test for combinations of others with
 130  * simple bit tests.
 131  */
 132 static const char *task_state_array[] = {
 133         "R (running)",          /*  0 */
 134         "S (sleeping)",         /*  1 */
 135         "D (disk sleep)",       /*  2 */
 136         "T (stopped)",          /*  4 */
 137         "T (tracing stop)",     /*  8 */
 138         "Z (zombie)",           /* 16 */
 139         "X (dead)"              /* 32 */
 140 };
 141
 142 static inline const char *get_task_state(struct task_struct *tsk)
 143 {
 144         unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
 145         const char **p = &task_state_array[0];
 146
 147         while (state) {
 148                 p++;
 149                 state >>= 1;
 150         }
 151         return *p;
 152 }
 153
 154 static inline char *task_state(struct task_struct *p, char *buffer)
 155 {
 156         struct group_info *group_info;
 157         int g;
 158         struct fdtable *fdt = NULL;
 159         struct pid_namespace *ns;
 160         pid_t ppid, tpid;
 161
 162         ns = current->nsproxy->pid_ns;
 163         rcu_read_lock();
 164         ppid = pid_alive(p) ?
 165                 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
 166         tpid = pid_alive(p) && p->ptrace ?
 167                 task_ppid_nr_ns(rcu_dereference(p->parent), ns) : 0;
 168         buffer += sprintf(buffer,
 169                 "State:\t%s\n"
 170                 "Tgid:\t%d\n"
 171                 "Pid:\t%d\n"
 172                 "PPid:\t%d\n"
 173                 "TracerPid:\t%d\n"
 174                 "Uid:\t%d\t%d\t%d\t%d\n"
 175                 "Gid:\t%d\t%d\t%d\t%d\n",
 176                 get_task_state(p),
 177                 task_tgid_nr_ns(p, ns),
 178                 task_pid_nr_ns(p, ns),
 179                 ppid, tpid,
 180                 p->uid, p->euid, p->suid, p->fsuid,
 181                 p->gid, p->egid, p->sgid, p->fsgid);
 182
 183         task_lock(p);
 184         if (p->files)
 185                 fdt = files_fdtable(p->files);
 186         buffer += sprintf(buffer,
 187                 "FDSize:\t%d\n"
 188                 "Groups:\t",
 189                 fdt ? fdt->max_fds : 0);
 190         rcu_read_unlock();
 191
 192         group_info = p->group_info;
 193         get_group_info(group_info);
 194         task_unlock(p);
 195
 196         for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
 197                 buffer += sprintf(buffer, "%d ", GROUP_AT(group_info, g));
 198         put_group_info(group_info);
 199
 200         buffer += sprintf(buffer, "\n");
 201         return buffer;
 202 }
 203
 204 static char *render_sigset_t(const char *header, sigset_t *set, char *buffer)
 205 {
 206         int i, len;
 207
 208         len = strlen(header);
 209         memcpy(buffer, header, len);
 210         buffer += len;
 211
 212         i = _NSIG;
 213         do {
 214                 int x = 0;
 215
 216                 i -= 4;
 217                 if (sigismember(set, i+1)) x |= 1;
 218                 if (sigismember(set, i+2)) x |= 2;
 219                 if (sigismember(set, i+3)) x |= 4;
 220                 if (sigismember(set, i+4)) x |= 8;
 221                 *buffer++ = (x < 10 ? '0' : 'a' - 10) + x;
 222         } while (i >= 4);
 223
 224         *buffer++ = '\n';
 225         *buffer = 0;
 226         return buffer;
 227 }
 228
 229 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
 230                                     sigset_t *catch)
 231 {
 232         struct k_sigaction *k;
 233         int i;
 234
 235         k = p->sighand->action;
 236         for (i = 1; i <= _NSIG; ++i, ++k) {
 237                 if (k->sa.sa_handler == SIG_IGN)
 238                         sigaddset(ign, i);
 239                 else if (k->sa.sa_handler != SIG_DFL)
 240                         sigaddset(catch, i);
 241         }
 242 }
 243
 244 static inline char *task_sig(struct task_struct *p, char *buffer)
 245 {
 246         unsigned long flags;
 247         sigset_t pending, shpending, blocked, ignored, caught;
 248         int num_threads = 0;
 249         unsigned long qsize = 0;
 250         unsigned long qlim = 0;
 251
 252         sigemptyset(&pending);
 253         sigemptyset(&shpending);
 254         sigemptyset(&blocked);
 255         sigemptyset(&ignored);
 256         sigemptyset(&caught);
 257
 258         rcu_read_lock();
 259         if (lock_task_sighand(p, &flags)) {
 260                 pending = p->pending.signal;
 261                 shpending = p->signal->shared_pending.signal;
 262                 blocked = p->blocked;
 263                 collect_sigign_sigcatch(p, &ignored, &caught);
 264                 num_threads = atomic_read(&p->signal->count);
 265                 qsize = atomic_read(&p->user->sigpending);
 266                 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
 267                 unlock_task_sighand(p, &flags);
 268         }
 269         rcu_read_unlock();
 270
 271         buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
 272         buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim);
 273
 274         /* render them all */
 275         buffer = render_sigset_t("SigPnd:\t", &pending, buffer);
 276         buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer);
 277         buffer = render_sigset_t("SigBlk:\t", &blocked, buffer);
 278         buffer = render_sigset_t("SigIgn:\t", &ignored, buffer);
 279         buffer = render_sigset_t("SigCgt:\t", &caught, buffer);
 280
 281         return buffer;
 282 }
 283
 284 static inline char *task_cap(struct task_struct *p, char *buffer)
 285 {
 286     return buffer + sprintf(buffer, "CapInh:\t%016x\n"
 287                             "CapPrm:\t%016x\n"
 288                             "CapEff:\t%016x\n",
 289                             cap_t(p->cap_inheritable),
 290                             cap_t(p->cap_permitted),
 291                             cap_t(p->cap_effective));
 292 }
 293
 294 static inline char *task_context_switch_counts(struct task_struct *p,
 295                                                 char *buffer)
 296 {
 297         return buffer + sprintf(buffer, "voluntary_ctxt_switches:\t%lu\n"
 298                             "nonvoluntary_ctxt_switches:\t%lu\n",
 299                             p->nvcsw,
 300                             p->nivcsw);
 301 }
 302
 303 int proc_pid_status(struct task_struct *task, char *buffer)
 304 {
 305         char *orig = buffer;
 306         struct mm_struct *mm = get_task_mm(task);
 307
 308         buffer = task_name(task, buffer);
 309         buffer = task_state(task, buffer);
 310
 311         if (mm) {
 312                 buffer = task_mem(mm, buffer);
 313                 mmput(mm);
 314         }
 315         buffer = task_sig(task, buffer);
 316         buffer = task_cap(task, buffer);
 317         buffer = cpuset_task_status_allowed(task, buffer);
 318 #if defined(CONFIG_S390)
 319         buffer = task_show_regs(task, buffer);
 320 #endif
 321         buffer = task_context_switch_counts(task, buffer);
 322         return buffer - orig;
 323 }
 324
 325 /*
 326  * Use precise platform statistics if available:
 327  */
 328 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 329 static cputime_t task_utime(struct task_struct *p)
 330 {
 331         return p->utime;
 332 }
 333
 334 static cputime_t task_stime(struct task_struct *p)
 335 {
 336         return p->stime;
 337 }
 338 #else
 339 static cputime_t task_utime(struct task_struct *p)
 340 {
 341         clock_t utime = cputime_to_clock_t(p->utime),
 342                 total = utime + cputime_to_clock_t(p->stime);
 343         u64 temp;
 344
 345         /*
 346          * Use CFS's precise accounting:
 347          */
 348         temp = (u64)nsec_to_clock_t(p->se.sum_exec_runtime);
 349
 350         if (total) {
 351                 temp *= utime;
 352                 do_div(temp, total);
 353         }
 354         utime = (clock_t)temp;
 355
 356         p->prev_utime = max(p->prev_utime, clock_t_to_cputime(utime));
 357         return p->prev_utime;
 358 }
 359
 360 static cputime_t task_stime(struct task_struct *p)
 361 {
 362         clock_t stime;
 363
 364         /*
 365          * Use CFS's precise accounting. (we subtract utime from
 366          * the total, to make sure the total observed by userspace
 367          * grows monotonically - apps rely on that):
 368          */
 369         stime = nsec_to_clock_t(p->se.sum_exec_runtime) -
 370                         cputime_to_clock_t(task_utime(p));
 371
 372         if (stime >= 0)
 373                 p->prev_stime = max(p->prev_stime, clock_t_to_cputime(stime));
 374
 375         return p->prev_stime;
 376 }
 377 #endif
 378
 379 static cputime_t task_gtime(struct task_struct *p)
 380 {
 381         return p->gtime;
 382 }
 383
 384 static int do_task_stat(struct task_struct *task, char *buffer, int whole)
 385 {
 386         unsigned long vsize, eip, esp, wchan = ~0UL;
 387         long priority, nice;
 388         int tty_pgrp = -1, tty_nr = 0;
 389         sigset_t sigign, sigcatch;
 390         char state;
 391         int res;
 392         pid_t ppid = 0, pgid = -1, sid = -1;
 393         int num_threads = 0;
 394         struct mm_struct *mm;
 395         unsigned long long start_time;
 396         unsigned long cmin_flt = 0, cmaj_flt = 0;
 397         unsigned long  min_flt = 0,  maj_flt = 0;
 398         cputime_t cutime, cstime, utime, stime;
 399         cputime_t cgtime, gtime;
 400         unsigned long rsslim = 0;
 401         char tcomm[sizeof(task->comm)];
 402         unsigned long flags;
 403         struct pid_namespace *ns;
 404
 405         ns = current->nsproxy->pid_ns;
 406
 407         state = *get_task_state(task);
 408         vsize = eip = esp = 0;
 409         mm = get_task_mm(task);
 410         if (mm) {
 411                 vsize = task_vsize(mm);
 412                 eip = KSTK_EIP(task);
 413                 esp = KSTK_ESP(task);
 414         }
 415
 416         get_task_comm(tcomm, task);
 417
 418         sigemptyset(&sigign);
 419         sigemptyset(&sigcatch);
 420         cutime = cstime = utime = stime = cputime_zero;
 421         cgtime = gtime = cputime_zero;
 422
 423         rcu_read_lock();
 424         if (lock_task_sighand(task, &flags)) {
 425                 struct signal_struct *sig = task->signal;
 426
 427                 if (sig->tty) {
 428                         tty_pgrp = pid_nr_ns(sig->tty->pgrp, ns);
 429                         tty_nr = new_encode_dev(tty_devnum(sig->tty));
 430                 }
 431
 432                 num_threads = atomic_read(&sig->count);
 433                 collect_sigign_sigcatch(task, &sigign, &sigcatch);
 434
 435                 cmin_flt = sig->cmin_flt;
 436                 cmaj_flt = sig->cmaj_flt;
 437                 cutime = sig->cutime;
 438                 cstime = sig->cstime;
 439                 cgtime = sig->cgtime;
 440                 rsslim = sig->rlim[RLIMIT_RSS].rlim_cur;
 441
 442                 /* add up live thread stats at the group level */
 443                 if (whole) {
 444                         struct task_struct *t = task;
 445                         do {
 446                                 min_flt += t->min_flt;
 447                                 maj_flt += t->maj_flt;
 448                                 utime = cputime_add(utime, task_utime(t));
 449                                 stime = cputime_add(stime, task_stime(t));
 450                                 gtime = cputime_add(gtime, task_gtime(t));
 451                                 t = next_thread(t);
 452                         } while (t != task);
 453
 454                         min_flt += sig->min_flt;
 455                         maj_flt += sig->maj_flt;
 456                         utime = cputime_add(utime, sig->utime);
 457                         stime = cputime_add(stime, sig->stime);
 458                         gtime = cputime_add(gtime, sig->gtime);
 459                 }
 460
 461                 sid = task_session_nr_ns(task, ns);
 462                 pgid = task_pgrp_nr_ns(task, ns);
 463                 ppid = task_ppid_nr_ns(task, ns);
 464
 465                 unlock_task_sighand(task, &flags);
 466         }
 467         rcu_read_unlock();
 468
 469         if (!whole || num_threads < 2)
 470                 wchan = get_wchan(task);
 471         if (!whole) {
 472                 min_flt = task->min_flt;
 473                 maj_flt = task->maj_flt;
 474                 utime = task_utime(task);
 475                 stime = task_stime(task);
 476                 gtime = task_gtime(task);
 477         }
 478
 479         /* scale priority and nice values from timeslices to -20..20 */
 480         /* to make it look like a "normal" Unix priority/nice value  */
 481         priority = task_prio(task);
 482         nice = task_nice(task);
 483
 484         /* Temporary variable needed for gcc-2.96 */
 485         /* convert timespec -> nsec*/
 486         start_time =
 487                 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
 488                                 + task->real_start_time.tv_nsec;
 489         /* convert nsec -> ticks */
 490         start_time = nsec_to_clock_t(start_time);
 491
 492         res = sprintf(buffer, "%d (%s) %c %d %d %d %d %d %u %lu \
 493 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
 494 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
 495                 task_pid_nr_ns(task, ns),
 496                 tcomm,
 497                 state,
 498                 ppid,
 499                 pgid,
 500                 sid,
 501                 tty_nr,
 502                 tty_pgrp,
 503                 task->flags,
 504                 min_flt,
 505                 cmin_flt,
 506                 maj_flt,
 507                 cmaj_flt,
 508                 cputime_to_clock_t(utime),
 509                 cputime_to_clock_t(stime),
 510                 cputime_to_clock_t(cutime),
 511                 cputime_to_clock_t(cstime),
 512                 priority,
 513                 nice,
 514                 num_threads,
 515                 start_time,
 516                 vsize,
 517                 mm ? get_mm_rss(mm) : 0,
 518                 rsslim,
 519                 mm ? mm->start_code : 0,
 520                 mm ? mm->end_code : 0,
 521                 mm ? mm->start_stack : 0,
 522                 esp,
 523                 eip,
 524                 /* The signal information here is obsolete.
 525                  * It must be decimal for Linux 2.0 compatibility.
 526                  * Use /proc/#/status for real-time signals.
 527                  */
 528                 task->pending.signal.sig[0] & 0x7fffffffUL,
 529                 task->blocked.sig[0] & 0x7fffffffUL,
 530                 sigign      .sig[0] & 0x7fffffffUL,
 531                 sigcatch    .sig[0] & 0x7fffffffUL,
 532                 wchan,
 533                 0UL,
 534                 0UL,
 535                 task->exit_signal,
 536                 task_cpu(task),
 537                 task->rt_priority,
 538                 task->policy,
 539                 (unsigned long long)delayacct_blkio_ticks(task),
 540                 cputime_to_clock_t(gtime),
 541                 cputime_to_clock_t(cgtime));
 542         if (mm)
 543                 mmput(mm);
 544         return res;
 545 }
 546
 547 int proc_tid_stat(struct task_struct *task, char *buffer)
 548 {
 549         return do_task_stat(task, buffer, 0);
 550 }
 551
 552 int proc_tgid_stat(struct task_struct *task, char *buffer)
 553 {
 554         return do_task_stat(task, buffer, 1);
 555 }
 556
 557 int proc_pid_statm(struct task_struct *task, char *buffer)
 558 {
 559         int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
 560         struct mm_struct *mm = get_task_mm(task);
 561
 562         if (mm) {
 563                 size = task_statm(mm, &shared, &text, &data, &resident);
 564                 mmput(mm);
 565         }
 566
 567         return sprintf(buffer, "%d %d %d %d %d %d %d\n",
 568                        size, resident, shared, text, lib, data, 0);
 569 }