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/vs_base.h>
  77 #include <linux/vs_context.h>
  78 #include <linux/vs_network.h>
  79 #include <linux/vs_cvirt.h>
  80
  81 #include <asm/uaccess.h>
  82 #include <asm/pgtable.h>
  83 #include <asm/io.h>
  84 #include <asm/processor.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
  96         ADDBUF(buf, "Name:\t");
  97         name = p->comm;
  98         i = sizeof(p->comm);
  99         do {
 100                 unsigned char c = *name;
 101                 name++;
 102                 i--;
 103                 *buf = c;
 104                 if (!c)
 105                         break;
 106                 if (c == '\\') {
 107                         buf[1] = c;
 108                         buf += 2;
 109                         continue;
 110                 }
 111                 if (c == '\n') {
 112                         buf[0] = '\\';
 113                         buf[1] = 'n';
 114                         buf += 2;
 115                         continue;
 116                 }
 117                 buf++;
 118         } while (i);
 119         *buf = '\n';
 120         return buf+1;
 121 }
 122
 123 /*
 124  * The task state array is a strange "bitmap" of
 125  * reasons to sleep. Thus "running" is zero, and
 126  * you can test for combinations of others with
 127  * simple bit tests.
 128  */
 129 static const char *task_state_array[] = {
 130         "R (running)",          /*  0 */
 131         "S (sleeping)",         /*  1 */
 132         "D (disk sleep)",       /*  2 */
 133         "T (stopped)",          /*  4 */
 134         "Z (zombie)",           /*  8 */
 135         "X (dead)",             /* 16 */
 136         "H (on hold)"           /* 32 */
 137 };
 138
 139 static inline const char * get_task_state(struct task_struct *tsk)
 140 {
 141         unsigned int state = tsk->state & (TASK_RUNNING |
 142                                            TASK_INTERRUPTIBLE |
 143                                            TASK_UNINTERRUPTIBLE |
 144                                            TASK_ZOMBIE |
 145                                            TASK_DEAD |
 146                                            TASK_STOPPED |
 147                                            TASK_ONHOLD);
 148         const char **p = &task_state_array[0];
 149
 150         while (state) {
 151                 p++;
 152                 state >>= 1;
 153         }
 154         return *p;
 155 }
 156
 157 static inline char * task_state(struct task_struct *p, char *buffer)
 158 {
 159         struct group_info *group_info;
 160         int g;
 161         pid_t pid, ppid, tgid;
 162
 163         read_lock(&tasklist_lock);
 164         tgid = vx_map_tgid(current->vx_info, p->tgid);
 165         pid = vx_map_tgid(current->vx_info, p->pid);
 166         ppid = vx_map_tgid(current->vx_info, p->real_parent->pid);
 167         buffer += sprintf(buffer,
 168                 "State:\t%s\n"
 169                 "SleepAVG:\t%lu%%\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                 (p->sleep_avg/1024)*100/(1020000000/1024),
 178                 tgid, pid, p->pid ? ppid : 0,
 179                 p->pid && p->ptrace ? p->parent->pid : 0,
 180                 p->uid, p->euid, p->suid, p->fsuid,
 181                 p->gid, p->egid, p->sgid, p->fsgid);
 182         read_unlock(&tasklist_lock);
 183         task_lock(p);
 184         buffer += sprintf(buffer,
 185                 "FDSize:\t%d\n"
 186                 "Groups:\t",
 187                 p->files ? p->files->max_fds : 0);
 188
 189         group_info = p->group_info;
 190         get_group_info(group_info);
 191         task_unlock(p);
 192
 193         for (g = 0; g < min(group_info->ngroups,NGROUPS_SMALL); g++)
 194                 buffer += sprintf(buffer, "%d ", GROUP_AT(group_info,g));
 195         put_group_info(group_info);
 196
 197         buffer += sprintf(buffer, "\n");
 198         return buffer;
 199 }
 200
 201 static char * render_sigset_t(const char *header, sigset_t *set, char *buffer)
 202 {
 203         int i, len;
 204
 205         len = strlen(header);
 206         memcpy(buffer, header, len);
 207         buffer += len;
 208
 209         i = _NSIG;
 210         do {
 211                 int x = 0;
 212
 213                 i -= 4;
 214                 if (sigismember(set, i+1)) x |= 1;
 215                 if (sigismember(set, i+2)) x |= 2;
 216                 if (sigismember(set, i+3)) x |= 4;
 217                 if (sigismember(set, i+4)) x |= 8;
 218                 *buffer++ = (x < 10 ? '0' : 'a' - 10) + x;
 219         } while (i >= 4);
 220
 221         *buffer++ = '\n';
 222         *buffer = 0;
 223         return buffer;
 224 }
 225
 226 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
 227                                     sigset_t *catch)
 228 {
 229         struct k_sigaction *k;
 230         int i;
 231
 232         k = p->sighand->action;
 233         for (i = 1; i <= _NSIG; ++i, ++k) {
 234                 if (k->sa.sa_handler == SIG_IGN)
 235                         sigaddset(ign, i);
 236                 else if (k->sa.sa_handler != SIG_DFL)
 237                         sigaddset(catch, i);
 238         }
 239 }
 240
 241 static inline char * task_sig(struct task_struct *p, char *buffer)
 242 {
 243         sigset_t pending, shpending, blocked, ignored, caught;
 244         int num_threads = 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                 spin_unlock_irq(&p->sighand->siglock);
 262         }
 263         read_unlock(&tasklist_lock);
 264
 265         buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
 266
 267         /* render them all */
 268         buffer = render_sigset_t("SigPnd:\t", &pending, buffer);
 269         buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer);
 270         buffer = render_sigset_t("SigBlk:\t", &blocked, buffer);
 271         buffer = render_sigset_t("SigIgn:\t", &ignored, buffer);
 272         buffer = render_sigset_t("SigCgt:\t", &caught, buffer);
 273
 274         return buffer;
 275 }
 276
 277 static inline char *task_cap(struct task_struct *p, char *buffer)
 278 {
 279     return buffer + sprintf(buffer, "CapInh:\t%016x\n"
 280                             "CapPrm:\t%016x\n"
 281                             "CapEff:\t%016x\n",
 282                             cap_t(p->cap_inheritable),
 283                             cap_t(p->cap_permitted),
 284                             cap_t(p->cap_effective));
 285 }
 286
 287 extern char *task_mem(struct mm_struct *, char *);
 288 int proc_pid_status(struct task_struct *task, char * buffer)
 289 {
 290         char * orig = buffer;
 291 #ifdef  CONFIG_VSERVER_LEGACY
 292         struct vx_info *vxi;
 293         struct nx_info *nxi;
 294 #endif
 295         struct mm_struct *mm = get_task_mm(task);
 296
 297         buffer = task_name(task, buffer);
 298         buffer = task_state(task, buffer);
 299
 300         if (mm) {
 301                 buffer = task_mem(mm, buffer);
 302                 mmput(mm);
 303         }
 304         buffer = task_sig(task, buffer);
 305         buffer = task_cap(task, buffer);
 306
 307 #ifdef  CONFIG_VSERVER_LEGACY
 308         buffer += sprintf (buffer,"s_context: %d\n", vx_task_xid(task));
 309         vxi = task_get_vx_info(task);
 310         if (vxi) {
 311                 buffer += sprintf (buffer,"ctxflags: %08llx\n"
 312                         ,(unsigned long long)vxi->vx_flags);
 313                 buffer += sprintf (buffer,"initpid: %d\n"
 314                         ,vxi->vx_initpid);
 315         } else {
 316                 buffer += sprintf (buffer,"ctxflags: none\n");
 317                 buffer += sprintf (buffer,"initpid: none\n");
 318         }
 319         put_vx_info(vxi);
 320         nxi = task_get_nx_info(task);
 321         if (nxi) {
 322                 int i;
 323
 324                 buffer += sprintf (buffer,"ipv4root:");
 325                 for (i=0; i<nxi->nbipv4; i++){
 326                         buffer += sprintf (buffer," %08x/%08x"
 327                                 ,nxi->ipv4[i]
 328                                 ,nxi->mask[i]);
 329                 }
 330                 *buffer++ = '\n';
 331                 buffer += sprintf (buffer,"ipv4root_bcast: %08x\n"
 332                         ,nxi->v4_bcast);
 333         } else {
 334                 buffer += sprintf (buffer,"ipv4root: 0\n");
 335                 buffer += sprintf (buffer,"ipv4root_bcast: 0\n");
 336         }
 337         put_nx_info(nxi);
 338 #endif
 339 #if defined(CONFIG_ARCH_S390)
 340         buffer = task_show_regs(task, buffer);
 341 #endif
 342         return buffer - orig;
 343 }
 344
 345 extern unsigned long task_vsize(struct mm_struct *);
 346 int proc_pid_stat(struct task_struct *task, char * buffer)
 347 {
 348         unsigned long vsize, eip, esp, wchan;
 349         long priority, nice;
 350         unsigned long long bias_jiffies;
 351         int tty_pgrp = -1, tty_nr = 0;
 352         sigset_t sigign, sigcatch;
 353         char state;
 354         int res;
 355         pid_t pid, ppid, pgid = -1, sid = -1;
 356         int num_threads = 0;
 357         struct mm_struct *mm;
 358         unsigned long long start_time;
 359
 360         state = *get_task_state(task);
 361         vsize = eip = esp = 0;
 362         bias_jiffies = INITIAL_JIFFIES;
 363
 364         task_lock(task);
 365         if (__vx_task_flags(task, VXF_VIRT_UPTIME, 0)) {
 366                 bias_jiffies = task->vx_info->cvirt.bias_jiffies;
 367                 /* hmm, do we need that? */
 368                 if (bias_jiffies > task->start_time)
 369                         bias_jiffies = task->start_time;
 370         }
 371         pid = vx_map_tgid(task->vx_info, task->pid);
 372
 373         mm = task->mm;
 374         if(mm)
 375                 mm = mmgrab(mm);
 376         task_unlock(task);
 377         if (mm) {
 378                 down_read(&mm->mmap_sem);
 379                 vsize = task_vsize(mm);
 380                 eip = KSTK_EIP(task);
 381                 esp = KSTK_ESP(task);
 382                 up_read(&mm->mmap_sem);
 383         }
 384
 385         wchan = get_wchan(task);
 386
 387         sigemptyset(&sigign);
 388         sigemptyset(&sigcatch);
 389         read_lock(&tasklist_lock);
 390         if (task->sighand) {
 391                 spin_lock_irq(&task->sighand->siglock);
 392                 num_threads = atomic_read(&task->signal->count);
 393                 collect_sigign_sigcatch(task, &sigign, &sigcatch);
 394                 spin_unlock_irq(&task->sighand->siglock);
 395         }
 396         if (task->signal) {
 397                 if (task->signal->tty) {
 398                         tty_pgrp = task->signal->tty->pgrp;
 399                         tty_nr = new_encode_dev(tty_devnum(task->signal->tty));
 400                 }
 401                 pgid = process_group(task);
 402                 sid = task->signal->session;
 403         }
 404         read_unlock(&tasklist_lock);
 405
 406         /* scale priority and nice values from timeslices to -20..20 */
 407         /* to make it look like a "normal" Unix priority/nice value  */
 408         priority = task_prio(task);
 409         nice = task_nice(task);
 410
 411         read_lock(&tasklist_lock);
 412         ppid = task->pid ? task->real_parent->pid : 0;
 413         read_unlock(&tasklist_lock);
 414
 415         /* Temporary variable needed for gcc-2.96 */
 416         start_time = jiffies_64_to_clock_t(task->start_time - bias_jiffies);
 417
 418         res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
 419 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d %ld %llu %lu %ld %lu %lu %lu %lu %lu \
 420 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu\n",
 421                 pid,
 422                 task->comm,
 423                 state,
 424                 ppid,
 425                 pgid,
 426                 sid,
 427                 tty_nr,
 428                 tty_pgrp,
 429                 task->flags,
 430                 task->min_flt,
 431                 task->cmin_flt,
 432                 task->maj_flt,
 433                 task->cmaj_flt,
 434                 jiffies_to_clock_t(task->utime),
 435                 jiffies_to_clock_t(task->stime),
 436                 jiffies_to_clock_t(task->cutime),
 437                 jiffies_to_clock_t(task->cstime),
 438                 priority,
 439                 nice,
 440                 num_threads,
 441                 jiffies_to_clock_t(task->it_real_value),
 442                 start_time,
 443                 vsize,
 444                 mm ? mm->rss : 0, /* you might want to shift this left 3 */
 445                 task->rlim[RLIMIT_RSS].rlim_cur,
 446                 mm ? mm->start_code : 0,
 447                 mm ? mm->end_code : 0,
 448                 mm ? mm->start_stack : 0,
 449                 esp,
 450                 eip,
 451                 /* The signal information here is obsolete.
 452                  * It must be decimal for Linux 2.0 compatibility.
 453                  * Use /proc/#/status for real-time signals.
 454                  */
 455                 task->pending.signal.sig[0] & 0x7fffffffUL,
 456                 task->blocked.sig[0] & 0x7fffffffUL,
 457                 sigign      .sig[0] & 0x7fffffffUL,
 458                 sigcatch    .sig[0] & 0x7fffffffUL,
 459                 wchan,
 460                 0UL,
 461                 0UL,
 462                 task->exit_signal,
 463                 task_cpu(task),
 464                 task->rt_priority,
 465                 task->policy);
 466         if(mm)
 467                 mmput(mm);
 468         return res;
 469 }
 470
 471 extern int task_statm(struct mm_struct *, int *, int *, int *, int *);
 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                 down_read(&mm->mmap_sem);
 479                 size = task_statm(mm, &shared, &text, &data, &resident);
 480                 up_read(&mm->mmap_sem);
 481
 482                 mmput(mm);
 483         }
 484
 485         return sprintf(buffer,"%d %d %d %d %d %d %d\n",
 486                        size, resident, shared, text, lib, data, 0);
 487 }