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         "N (noninteractive)",   /* 64 */
 140         "H (on hold)"           /* 128 */
 141 };
 142
 143 static inline const char * get_task_state(struct task_struct *tsk)
 144 {
 145         unsigned int state = (tsk->state & (TASK_RUNNING |
 146                                             TASK_INTERRUPTIBLE |
 147                                             TASK_UNINTERRUPTIBLE |
 148                                             TASK_STOPPED |
 149                                            TASK_TRACED |
 150                                            TASK_ONHOLD)) |
 151                         (tsk->exit_state & (EXIT_ZOMBIE |
 152                                             EXIT_DEAD));
 153         const char **p = &task_state_array[0];
 154
 155         while (state) {
 156                 p++;
 157                 state >>= 1;
 158         }
 159         return *p;
 160 }
 161
 162 static inline char * task_state(struct task_struct *p, char *buffer)
 163 {
 164         struct group_info *group_info;
 165         int g;
 166         struct fdtable *fdt = NULL;
 167         pid_t pid, ptgid, tppid, tgid;
 168
 169         read_lock(&tasklist_lock);
 170         tgid = vx_map_tgid(p->tgid);
 171         pid = vx_map_pid(p->pid);
 172         ptgid = vx_map_pid(p->group_leader->real_parent->tgid);
 173         tppid = vx_map_pid(p->parent->pid);
 174         buffer += sprintf(buffer,
 175                 "State:\t%s\n"
 176                 "SleepAVG:\t%lu%%\n"
 177                 "Tgid:\t%d\n"
 178                 "Pid:\t%d\n"
 179                 "PPid:\t%d\n"
 180                 "TracerPid:\t%d\n"
 181                 "Uid:\t%d\t%d\t%d\t%d\n"
 182                 "Gid:\t%d\t%d\t%d\t%d\n",
 183                 get_task_state(p),
 184                 (p->sleep_avg/1024)*100/(1020000000/1024),
 185                 tgid, pid, (pid > 1) ? ptgid : 0,
 186                 pid_alive(p) && p->ptrace ? tppid : 0,
 187                 p->uid, p->euid, p->suid, p->fsuid,
 188                 p->gid, p->egid, p->sgid, p->fsgid);
 189         read_unlock(&tasklist_lock);
 190         task_lock(p);
 191         rcu_read_lock();
 192         if (p->files)
 193                 fdt = files_fdtable(p->files);
 194         buffer += sprintf(buffer,
 195                 "FDSize:\t%d\n"
 196                 "Groups:\t",
 197                 fdt ? fdt->max_fds : 0);
 198         rcu_read_unlock();
 199
 200         group_info = p->group_info;
 201         get_group_info(group_info);
 202         task_unlock(p);
 203
 204         for (g = 0; g < min(group_info->ngroups,NGROUPS_SMALL); g++)
 205                 buffer += sprintf(buffer, "%d ", GROUP_AT(group_info,g));
 206         put_group_info(group_info);
 207
 208         buffer += sprintf(buffer, "\n");
 209         return buffer;
 210 }
 211
 212 static char * render_sigset_t(const char *header, sigset_t *set, char *buffer)
 213 {
 214         int i, len;
 215
 216         len = strlen(header);
 217         memcpy(buffer, header, len);
 218         buffer += len;
 219
 220         i = _NSIG;
 221         do {
 222                 int x = 0;
 223
 224                 i -= 4;
 225                 if (sigismember(set, i+1)) x |= 1;
 226                 if (sigismember(set, i+2)) x |= 2;
 227                 if (sigismember(set, i+3)) x |= 4;
 228                 if (sigismember(set, i+4)) x |= 8;
 229                 *buffer++ = (x < 10 ? '0' : 'a' - 10) + x;
 230         } while (i >= 4);
 231
 232         *buffer++ = '\n';
 233         *buffer = 0;
 234         return buffer;
 235 }
 236
 237 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
 238                                     sigset_t *catch)
 239 {
 240         struct k_sigaction *k;
 241         int i;
 242
 243         k = p->sighand->action;
 244         for (i = 1; i <= _NSIG; ++i, ++k) {
 245                 if (k->sa.sa_handler == SIG_IGN)
 246                         sigaddset(ign, i);
 247                 else if (k->sa.sa_handler != SIG_DFL)
 248                         sigaddset(catch, i);
 249         }
 250 }
 251
 252 static inline char * task_sig(struct task_struct *p, char *buffer)
 253 {
 254         sigset_t pending, shpending, blocked, ignored, caught;
 255         int num_threads = 0;
 256         unsigned long qsize = 0;
 257         unsigned long qlim = 0;
 258
 259         sigemptyset(&pending);
 260         sigemptyset(&shpending);
 261         sigemptyset(&blocked);
 262         sigemptyset(&ignored);
 263         sigemptyset(&caught);
 264
 265         /* Gather all the data with the appropriate locks held */
 266         read_lock(&tasklist_lock);
 267         if (p->sighand) {
 268                 spin_lock_irq(&p->sighand->siglock);
 269                 pending = p->pending.signal;
 270                 shpending = p->signal->shared_pending.signal;
 271                 blocked = p->blocked;
 272                 collect_sigign_sigcatch(p, &ignored, &caught);
 273                 num_threads = atomic_read(&p->signal->count);
 274                 qsize = atomic_read(&p->user->sigpending);
 275                 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
 276                 spin_unlock_irq(&p->sighand->siglock);
 277         }
 278         read_unlock(&tasklist_lock);
 279
 280         buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
 281         buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim);
 282
 283         /* render them all */
 284         buffer = render_sigset_t("SigPnd:\t", &pending, buffer);
 285         buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer);
 286         buffer = render_sigset_t("SigBlk:\t", &blocked, buffer);
 287         buffer = render_sigset_t("SigIgn:\t", &ignored, buffer);
 288         buffer = render_sigset_t("SigCgt:\t", &caught, buffer);
 289
 290         return buffer;
 291 }
 292
 293 static inline char *task_cap(struct task_struct *p, char *buffer)
 294 {
 295     return buffer + sprintf(buffer, "CapInh:\t%016x\n"
 296                             "CapPrm:\t%016x\n"
 297                             "CapEff:\t%016x\n",
 298                             cap_t(p->cap_inheritable),
 299                             cap_t(p->cap_permitted),
 300                             cap_t(p->cap_effective));
 301 }
 302
 303 int proc_pid_status(struct task_struct *task, char * buffer)
 304 {
 305         char * orig = buffer;
 306 #ifdef  CONFIG_VSERVER_LEGACY
 307         struct vx_info *vxi;
 308 #endif
 309 #ifdef  CONFIG_VSERVER_LEGACYNET
 310         struct nx_info *nxi;
 311 #endif
 312         struct mm_struct *mm = get_task_mm(task);
 313
 314         buffer = task_name(task, buffer);
 315         buffer = task_state(task, buffer);
 316
 317         if (mm) {
 318                 buffer = task_mem(mm, buffer);
 319                 mmput(mm);
 320         }
 321         buffer = task_sig(task, buffer);
 322         buffer = task_cap(task, buffer);
 323         buffer = cpuset_task_status_allowed(task, buffer);
 324
 325         if (task_vx_flags(task, VXF_INFO_HIDE, 0))
 326                 goto skip;
 327 #ifdef  CONFIG_VSERVER_LEGACY
 328         buffer += sprintf (buffer,"s_context: %d\n", vx_task_xid(task));
 329         vxi = task_get_vx_info(task);
 330         if (vxi) {
 331                 buffer += sprintf (buffer,"ctxflags: %08llx\n"
 332                         ,(unsigned long long)vxi->vx_flags);
 333                 buffer += sprintf (buffer,"initpid: %d\n"
 334                         ,vxi->vx_initpid);
 335         } else {
 336                 buffer += sprintf (buffer,"ctxflags: none\n");
 337                 buffer += sprintf (buffer,"initpid: none\n");
 338         }
 339         put_vx_info(vxi);
 340 #else
 341         buffer += sprintf (buffer,"VxID: %d\n", vx_task_xid(task));
 342 #endif
 343 #ifdef  CONFIG_VSERVER_LEGACYNET
 344         nxi = task_get_nx_info(task);
 345         if (nxi) {
 346                 int i;
 347
 348                 buffer += sprintf (buffer,"ipv4root:");
 349                 for (i=0; i<nxi->nbipv4; i++){
 350                         buffer += sprintf (buffer," %08x/%08x"
 351                                 ,nxi->ipv4[i]
 352                                 ,nxi->mask[i]);
 353                 }
 354                 *buffer++ = '\n';
 355                 buffer += sprintf (buffer,"ipv4root_bcast: %08x\n"
 356                         ,nxi->v4_bcast);
 357         } else {
 358                 buffer += sprintf (buffer,"ipv4root: 0\n");
 359                 buffer += sprintf (buffer,"ipv4root_bcast: 0\n");
 360         }
 361         put_nx_info(nxi);
 362 #endif
 363 skip:
 364 #if defined(CONFIG_S390)
 365         buffer = task_show_regs(task, buffer);
 366 #endif
 367         return buffer - orig;
 368 }
 369
 370 static int do_task_stat(struct task_struct *task, char * buffer, int whole)
 371 {
 372         unsigned long vsize, eip, esp, wchan = ~0UL;
 373         long priority, nice;
 374         int tty_pgrp = -1, tty_nr = 0;
 375         sigset_t sigign, sigcatch;
 376         char state;
 377         int res;
 378         pid_t pid, ppid, pgid = -1, sid = -1;
 379         int num_threads = 0;
 380         struct mm_struct *mm;
 381         unsigned long long start_time;
 382         unsigned long cmin_flt = 0, cmaj_flt = 0;
 383         unsigned long  min_flt = 0,  maj_flt = 0;
 384         cputime_t cutime, cstime, utime, stime;
 385         unsigned long rsslim = 0;
 386         struct task_struct *t;
 387         char tcomm[sizeof(task->comm)];
 388
 389         state = *get_task_state(task);
 390         vsize = eip = esp = 0;
 391         mm = get_task_mm(task);
 392         if (mm) {
 393                 vsize = task_vsize(mm);
 394                 eip = KSTK_EIP(task);
 395                 esp = KSTK_ESP(task);
 396         }
 397
 398         get_task_comm(tcomm, task);
 399
 400         sigemptyset(&sigign);
 401         sigemptyset(&sigcatch);
 402         cutime = cstime = utime = stime = cputime_zero;
 403
 404         mutex_lock(&tty_mutex);
 405         read_lock(&tasklist_lock);
 406         if (task->sighand) {
 407                 spin_lock_irq(&task->sighand->siglock);
 408                 num_threads = atomic_read(&task->signal->count);
 409                 collect_sigign_sigcatch(task, &sigign, &sigcatch);
 410
 411                 /* add up live thread stats at the group level */
 412                 if (whole) {
 413                         t = task;
 414                         do {
 415                                 min_flt += t->min_flt;
 416                                 maj_flt += t->maj_flt;
 417                                 utime = cputime_add(utime, t->utime);
 418                                 stime = cputime_add(stime, t->stime);
 419                                 t = next_thread(t);
 420                         } while (t != task);
 421                 }
 422
 423                 spin_unlock_irq(&task->sighand->siglock);
 424         }
 425         if (task->signal) {
 426                 if (task->signal->tty) {
 427                         tty_pgrp = task->signal->tty->pgrp;
 428                         tty_nr = new_encode_dev(tty_devnum(task->signal->tty));
 429                 }
 430                 pgid = process_group(task);
 431                 sid = task->signal->session;
 432                 cmin_flt = task->signal->cmin_flt;
 433                 cmaj_flt = task->signal->cmaj_flt;
 434                 cutime = task->signal->cutime;
 435                 cstime = task->signal->cstime;
 436                 rsslim = task->signal->rlim[RLIMIT_RSS].rlim_cur;
 437                 if (whole) {
 438                         min_flt += task->signal->min_flt;
 439                         maj_flt += task->signal->maj_flt;
 440                         utime = cputime_add(utime, task->signal->utime);
 441                         stime = cputime_add(stime, task->signal->stime);
 442                 }
 443         }
 444         pid = vx_info_map_pid(task->vx_info, pid_alive(task) ? task->pid : 0);
 445         ppid = (!(pid > 1)) ? 0 : vx_info_map_tgid(task->vx_info,
 446                 task->group_leader->real_parent->tgid);
 447         pgid = vx_info_map_pid(task->vx_info, pgid);
 448
 449         read_unlock(&tasklist_lock);
 450         mutex_unlock(&tty_mutex);
 451
 452         if (!whole || num_threads<2) {
 453                 wchan = 0;
 454                 if (current->uid == task->uid || current->euid == task->uid ||
 455                                 capable(CAP_SYS_NICE))
 456                         wchan = get_wchan(task);
 457         }
 458         if (!whole) {
 459                 min_flt = task->min_flt;
 460                 maj_flt = task->maj_flt;
 461                 utime = task->utime;
 462                 stime = task->stime;
 463         }
 464
 465         /* scale priority and nice values from timeslices to -20..20 */
 466         /* to make it look like a "normal" Unix priority/nice value  */
 467         priority = task_prio(task);
 468         nice = task_nice(task);
 469
 470         /* Temporary variable needed for gcc-2.96 */
 471         /* convert timespec -> nsec*/
 472         start_time = (unsigned long long)task->start_time.tv_sec * NSEC_PER_SEC
 473                                 + task->start_time.tv_nsec;
 474         /* convert nsec -> ticks */
 475         start_time = nsec_to_clock_t(start_time);
 476
 477         /* fixup start time for virt uptime */
 478         if (vx_flags(VXF_VIRT_UPTIME, 0)) {
 479                 unsigned long long bias =
 480                         current->vx_info->cvirt.bias_clock;
 481
 482                 if (start_time > bias)
 483                         start_time -= bias;
 484                 else
 485                         start_time = 0;
 486         }
 487
 488         res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
 489 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
 490 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu %llu\n",
 491                 pid,
 492                 tcomm,
 493                 state,
 494                 ppid,
 495                 pgid,
 496                 sid,
 497                 tty_nr,
 498                 tty_pgrp,
 499                 task->flags,
 500                 min_flt,
 501                 cmin_flt,
 502                 maj_flt,
 503                 cmaj_flt,
 504                 cputime_to_clock_t(utime),
 505                 cputime_to_clock_t(stime),
 506                 cputime_to_clock_t(cutime),
 507                 cputime_to_clock_t(cstime),
 508                 priority,
 509                 nice,
 510                 num_threads,
 511                 start_time,
 512                 vsize,
 513                 mm ? get_mm_rss(mm) : 0,
 514                 rsslim,
 515                 mm ? mm->start_code : 0,
 516                 mm ? mm->end_code : 0,
 517                 mm ? mm->start_stack : 0,
 518                 esp,
 519                 eip,
 520                 /* The signal information here is obsolete.
 521                  * It must be decimal for Linux 2.0 compatibility.
 522                  * Use /proc/#/status for real-time signals.
 523                  */
 524                 task->pending.signal.sig[0] & 0x7fffffffUL,
 525                 task->blocked.sig[0] & 0x7fffffffUL,
 526                 sigign      .sig[0] & 0x7fffffffUL,
 527                 sigcatch    .sig[0] & 0x7fffffffUL,
 528                 wchan,
 529                 0UL,
 530                 0UL,
 531                 task->exit_signal,
 532                 task_cpu(task),
 533                 task->rt_priority,
 534                 task->policy,
 535                 (unsigned long long)delayacct_blkio_ticks(task));
 536         if(mm)
 537                 mmput(mm);
 538         return res;
 539 }
 540
 541 int proc_tid_stat(struct task_struct *task, char * buffer)
 542 {
 543         return do_task_stat(task, buffer, 0);
 544 }
 545
 546 int proc_tgid_stat(struct task_struct *task, char * buffer)
 547 {
 548         return do_task_stat(task, buffer, 1);
 549 }
 550
 551 int proc_pid_statm(struct task_struct *task, char *buffer)
 552 {
 553         int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
 554         struct mm_struct *mm = get_task_mm(task);
 555
 556         if (mm) {
 557                 size = task_statm(mm, &shared, &text, &data, &resident);
 558                 mmput(mm);
 559         }
 560
 561         return sprintf(buffer,"%d %d %d %d %d %d %d\n",
 562                        size, resident, shared, text, lib, data, 0);
 563 }