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/config.h>
  56 #include <linux/types.h>
  57 #include <linux/errno.h>
  58 #include <linux/time.h>
  59 #include <linux/kernel.h>
  60 #include <linux/kernel_stat.h>
  61 #include <linux/tty.h>
  62 #include <linux/string.h>
  63 #include <linux/mman.h>
  64 #include <linux/proc_fs.h>
  65 #include <linux/ioport.h>
  66 #include <linux/mm.h>
  67 #include <linux/hugetlb.h>
  68 #include <linux/pagemap.h>
  69 #include <linux/swap.h>
  70 #include <linux/slab.h>
  71 #include <linux/smp.h>
  72 #include <linux/signal.h>
  73 #include <linux/highmem.h>
  74 #include <linux/file.h>
  75 #include <linux/times.h>
  76 #include <linux/cpuset.h>
  77
  78 #include <asm/uaccess.h>
  79 #include <asm/pgtable.h>
  80 #include <asm/io.h>
  81 #include <asm/processor.h>
  82 #include "internal.h"
  83
  84 /* Gcc optimizes away "strlen(x)" for constant x */
  85 #define ADDBUF(buffer, string) \
  86 do { memcpy(buffer, string, strlen(string)); \
  87      buffer += strlen(string); } while (0)
  88
  89 static inline char * task_name(struct task_struct *p, char * buf)
  90 {
  91         int i;
  92         char * name;
  93         char tcomm[sizeof(p->comm)];
  94
  95         get_task_comm(tcomm, p);
  96
  97         ADDBUF(buf, "Name:\t");
  98         name = tcomm;
  99         i = sizeof(tcomm);
 100         do {
 101                 unsigned char c = *name;
 102                 name++;
 103                 i--;
 104                 *buf = c;
 105                 if (!c)
 106                         break;
 107                 if (c == '\\') {
 108                         buf[1] = c;
 109                         buf += 2;
 110                         continue;
 111                 }
 112                 if (c == '\n') {
 113                         buf[0] = '\\';
 114                         buf[1] = 'n';
 115                         buf += 2;
 116                         continue;
 117                 }
 118                 buf++;
 119         } while (i);
 120         *buf = '\n';
 121         return buf+1;
 122 }
 123
 124 /*
 125  * The task state array is a strange "bitmap" of
 126  * reasons to sleep. Thus "running" is zero, and
 127  * you can test for combinations of others with
 128  * simple bit tests.
 129  */
 130 static const char *task_state_array[] = {
 131         "R (running)",          /*  0 */
 132         "S (sleeping)",         /*  1 */
 133         "D (disk sleep)",       /*  2 */
 134         "T (stopped)",          /*  4 */
 135         "T (tracing stop)",     /*  8 */
 136         "Z (zombie)",           /* 16 */
 137         "X (dead)"              /* 32 */
 138 };
 139
 140 static inline const char * get_task_state(struct task_struct *tsk)
 141 {
 142         unsigned int state = (tsk->state & (TASK_RUNNING |
 143                                             TASK_INTERRUPTIBLE |
 144                                             TASK_UNINTERRUPTIBLE |
 145                                             TASK_STOPPED |
 146                                             TASK_TRACED)) |
 147                         (tsk->exit_state & (EXIT_ZOMBIE |
 148                                             EXIT_DEAD));
 149         const char **p = &task_state_array[0];
 150
 151         while (state) {
 152                 p++;
 153                 state >>= 1;
 154         }
 155         return *p;
 156 }
 157
 158 static inline char * task_state(struct task_struct *p, char *buffer)
 159 {
 160         struct group_info *group_info;
 161         int g;
 162
 163         read_lock(&tasklist_lock);
 164         buffer += sprintf(buffer,
 165                 "State:\t%s\n"
 166                 "SleepAVG:\t%lu%%\n"
 167                 "Tgid:\t%d\n"
 168                 "Pid:\t%d\n"
 169                 "PPid:\t%d\n"
 170                 "TracerPid:\t%d\n"
 171                 "Uid:\t%d\t%d\t%d\t%d\n"
 172                 "Gid:\t%d\t%d\t%d\t%d\n",
 173                 get_task_state(p),
 174                 (p->sleep_avg/1024)*100/(1020000000/1024),
 175                 p->tgid,
 176                 p->pid, pid_alive(p) ? p->group_leader->real_parent->tgid : 0,
 177                 pid_alive(p) && p->ptrace ? p->parent->pid : 0,
 178                 p->uid, p->euid, p->suid, p->fsuid,
 179                 p->gid, p->egid, p->sgid, p->fsgid);
 180         read_unlock(&tasklist_lock);
 181         task_lock(p);
 182         buffer += sprintf(buffer,
 183                 "FDSize:\t%d\n"
 184                 "Groups:\t",
 185                 p->files ? p->files->max_fds : 0);
 186
 187         group_info = p->group_info;
 188         get_group_info(group_info);
 189         task_unlock(p);
 190
 191         for (g = 0; g < min(group_info->ngroups,NGROUPS_SMALL); g++)
 192                 buffer += sprintf(buffer, "%d ", GROUP_AT(group_info,g));
 193         put_group_info(group_info);
 194
 195         buffer += sprintf(buffer, "\n");
 196         return buffer;
 197 }
 198
 199 static char * render_sigset_t(const char *header, sigset_t *set, char *buffer)
 200 {
 201         int i, len;
 202
 203         len = strlen(header);
 204         memcpy(buffer, header, len);
 205         buffer += len;
 206
 207         i = _NSIG;
 208         do {
 209                 int x = 0;
 210
 211                 i -= 4;
 212                 if (sigismember(set, i+1)) x |= 1;
 213                 if (sigismember(set, i+2)) x |= 2;
 214                 if (sigismember(set, i+3)) x |= 4;
 215                 if (sigismember(set, i+4)) x |= 8;
 216                 *buffer++ = (x < 10 ? '0' : 'a' - 10) + x;
 217         } while (i >= 4);
 218
 219         *buffer++ = '\n';
 220         *buffer = 0;
 221         return buffer;
 222 }
 223
 224 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
 225                                     sigset_t *catch)
 226 {
 227         struct k_sigaction *k;
 228         int i;
 229
 230         k = p->sighand->action;
 231         for (i = 1; i <= _NSIG; ++i, ++k) {
 232                 if (k->sa.sa_handler == SIG_IGN)
 233                         sigaddset(ign, i);
 234                 else if (k->sa.sa_handler != SIG_DFL)
 235                         sigaddset(catch, i);
 236         }
 237 }
 238
 239 static inline char * task_sig(struct task_struct *p, char *buffer)
 240 {
 241         sigset_t pending, shpending, blocked, ignored, caught;
 242         int num_threads = 0;
 243         unsigned long qsize = 0;
 244         unsigned long qlim = 0;
 245
 246         sigemptyset(&pending);
 247         sigemptyset(&shpending);
 248         sigemptyset(&blocked);
 249         sigemptyset(&ignored);
 250         sigemptyset(&caught);
 251
 252         /* Gather all the data with the appropriate locks held */
 253         read_lock(&tasklist_lock);
 254         if (p->sighand) {
 255                 spin_lock_irq(&p->sighand->siglock);
 256                 pending = p->pending.signal;
 257                 shpending = p->signal->shared_pending.signal;
 258                 blocked = p->blocked;
 259                 collect_sigign_sigcatch(p, &ignored, &caught);
 260                 num_threads = atomic_read(&p->signal->count);
 261                 qsize = atomic_read(&p->user->sigpending);
 262                 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
 263                 spin_unlock_irq(&p->sighand->siglock);
 264         }
 265         read_unlock(&tasklist_lock);
 266
 267         buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
 268         buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim);
 269
 270         /* render them all */
 271         buffer = render_sigset_t("SigPnd:\t", &pending, buffer);
 272         buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer);
 273         buffer = render_sigset_t("SigBlk:\t", &blocked, buffer);
 274         buffer = render_sigset_t("SigIgn:\t", &ignored, buffer);
 275         buffer = render_sigset_t("SigCgt:\t", &caught, buffer);
 276
 277         return buffer;
 278 }
 279
 280 static inline char *task_cap(struct task_struct *p, char *buffer)
 281 {
 282     return buffer + sprintf(buffer, "CapInh:\t%016x\n"
 283                             "CapPrm:\t%016x\n"
 284                             "CapEff:\t%016x\n",
 285                             cap_t(p->cap_inheritable),
 286                             cap_t(p->cap_permitted),
 287                             cap_t(p->cap_effective));
 288 }
 289
 290 int proc_pid_status(struct task_struct *task, char * buffer)
 291 {
 292         char * orig = buffer;
 293         struct mm_struct *mm = get_task_mm(task);
 294
 295         buffer = task_name(task, buffer);
 296         buffer = task_state(task, buffer);
 297
 298         if (mm) {
 299                 buffer = task_mem(mm, buffer);
 300                 mmput(mm);
 301         }
 302         buffer = task_sig(task, buffer);
 303         buffer = task_cap(task, buffer);
 304         buffer = cpuset_task_status_allowed(task, buffer);
 305 #if defined(CONFIG_ARCH_S390)
 306         buffer = task_show_regs(task, buffer);
 307 #endif
 308         return buffer - orig;
 309 }
 310
 311 static int do_task_stat(struct task_struct *task, char * buffer, int whole)
 312 {
 313         unsigned long vsize, eip, esp, wchan = ~0UL;
 314         long priority, nice;
 315         int tty_pgrp = -1, tty_nr = 0;
 316         sigset_t sigign, sigcatch;
 317         char state;
 318         int res;
 319         pid_t ppid, pgid = -1, sid = -1;
 320         int num_threads = 0;
 321         struct mm_struct *mm;
 322         unsigned long long start_time;
 323         unsigned long cmin_flt = 0, cmaj_flt = 0;
 324         unsigned long  min_flt = 0,  maj_flt = 0;
 325         cputime_t cutime, cstime, utime, stime;
 326         unsigned long rsslim = 0;
 327         unsigned long it_real_value = 0;
 328         struct task_struct *t;
 329         char tcomm[sizeof(task->comm)];
 330
 331         state = *get_task_state(task);
 332         vsize = eip = esp = 0;
 333         mm = get_task_mm(task);
 334         if (mm) {
 335                 vsize = task_vsize(mm);
 336                 eip = KSTK_EIP(task);
 337                 esp = KSTK_ESP(task);
 338         }
 339
 340         get_task_comm(tcomm, task);
 341
 342         sigemptyset(&sigign);
 343         sigemptyset(&sigcatch);
 344         cutime = cstime = utime = stime = cputime_zero;
 345         read_lock(&tasklist_lock);
 346         if (task->sighand) {
 347                 spin_lock_irq(&task->sighand->siglock);
 348                 num_threads = atomic_read(&task->signal->count);
 349                 collect_sigign_sigcatch(task, &sigign, &sigcatch);
 350
 351                 /* add up live thread stats at the group level */
 352                 if (whole) {
 353                         t = task;
 354                         do {
 355                                 min_flt += t->min_flt;
 356                                 maj_flt += t->maj_flt;
 357                                 utime = cputime_add(utime, t->utime);
 358                                 stime = cputime_add(stime, t->stime);
 359                                 t = next_thread(t);
 360                         } while (t != task);
 361                 }
 362
 363                 spin_unlock_irq(&task->sighand->siglock);
 364         }
 365         if (task->signal) {
 366                 if (task->signal->tty) {
 367                         tty_pgrp = task->signal->tty->pgrp;
 368                         tty_nr = new_encode_dev(tty_devnum(task->signal->tty));
 369                 }
 370                 pgid = process_group(task);
 371                 sid = task->signal->session;
 372                 cmin_flt = task->signal->cmin_flt;
 373                 cmaj_flt = task->signal->cmaj_flt;
 374                 cutime = task->signal->cutime;
 375                 cstime = task->signal->cstime;
 376                 rsslim = task->signal->rlim[RLIMIT_RSS].rlim_cur;
 377                 if (whole) {
 378                         min_flt += task->signal->min_flt;
 379                         maj_flt += task->signal->maj_flt;
 380                         utime = cputime_add(utime, task->signal->utime);
 381                         stime = cputime_add(stime, task->signal->stime);
 382                 }
 383                 it_real_value = task->signal->it_real_value;
 384         }
 385         ppid = pid_alive(task) ? task->group_leader->real_parent->tgid : 0;
 386         read_unlock(&tasklist_lock);
 387
 388         if (!whole || num_threads<2)
 389                 wchan = get_wchan(task);
 390         if (!whole) {
 391                 min_flt = task->min_flt;
 392                 maj_flt = task->maj_flt;
 393                 utime = task->utime;
 394                 stime = task->stime;
 395         }
 396
 397         /* scale priority and nice values from timeslices to -20..20 */
 398         /* to make it look like a "normal" Unix priority/nice value  */
 399         priority = task_prio(task);
 400         nice = task_nice(task);
 401
 402         /* Temporary variable needed for gcc-2.96 */
 403         /* convert timespec -> nsec*/
 404         start_time = (unsigned long long)task->start_time.tv_sec * NSEC_PER_SEC
 405                                 + task->start_time.tv_nsec;
 406         /* convert nsec -> ticks */
 407         start_time = nsec_to_clock_t(start_time);
 408
 409         res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
 410 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d %ld %llu %lu %ld %lu %lu %lu %lu %lu \
 411 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu\n",
 412                 task->pid,
 413                 tcomm,
 414                 state,
 415                 ppid,
 416                 pgid,
 417                 sid,
 418                 tty_nr,
 419                 tty_pgrp,
 420                 task->flags,
 421                 min_flt,
 422                 cmin_flt,
 423                 maj_flt,
 424                 cmaj_flt,
 425                 cputime_to_clock_t(utime),
 426                 cputime_to_clock_t(stime),
 427                 cputime_to_clock_t(cutime),
 428                 cputime_to_clock_t(cstime),
 429                 priority,
 430                 nice,
 431                 num_threads,
 432                 jiffies_to_clock_t(it_real_value),
 433                 start_time,
 434                 vsize,
 435                 mm ? get_mm_counter(mm, rss) : 0, /* you might want to shift this left 3 */
 436                 rsslim,
 437                 mm ? mm->start_code : 0,
 438                 mm ? mm->end_code : 0,
 439                 mm ? mm->start_stack : 0,
 440                 esp,
 441                 eip,
 442                 /* The signal information here is obsolete.
 443                  * It must be decimal for Linux 2.0 compatibility.
 444                  * Use /proc/#/status for real-time signals.
 445                  */
 446                 task->pending.signal.sig[0] & 0x7fffffffUL,
 447                 task->blocked.sig[0] & 0x7fffffffUL,
 448                 sigign      .sig[0] & 0x7fffffffUL,
 449                 sigcatch    .sig[0] & 0x7fffffffUL,
 450                 wchan,
 451                 0UL,
 452                 0UL,
 453                 task->exit_signal,
 454                 task_cpu(task),
 455                 task->rt_priority,
 456                 task->policy);
 457         if(mm)
 458                 mmput(mm);
 459         return res;
 460 }
 461
 462 int proc_tid_stat(struct task_struct *task, char * buffer)
 463 {
 464         return do_task_stat(task, buffer, 0);
 465 }
 466
 467 int proc_tgid_stat(struct task_struct *task, char * buffer)
 468 {
 469         return do_task_stat(task, buffer, 1);
 470 }
 471
 472 int proc_pid_statm(struct task_struct *task, char *buffer)
 473 {
 474         int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
 475         struct mm_struct *mm = get_task_mm(task);
 476
 477         if (mm) {
 478                 size = task_statm(mm, &shared, &text, &data, &resident);
 479                 mmput(mm);
 480         }
 481
 482         return sprintf(buffer,"%d %d %d %d %d %d %d\n",
 483                        size, resident, shared, text, lib, data, 0);
 484 }