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 ppid;
 162
 163         read_lock(&tasklist_lock);
 164         ppid = vx_map_tgid(current->vx_info, p->real_parent->pid);
 165         buffer += sprintf(buffer,
 166                 "State:\t%s\n"
 167                 "SleepAVG:\t%lu%%\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->sleep_avg/1024)*100/(1020000000/1024),
 176                 p->tgid,
 177                 p->pid, p->pid ? ppid : 0,
 178                 p->pid && p->ptrace ? p->parent->pid : 0,
 179                 p->uid, p->euid, p->suid, p->fsuid,
 180                 p->gid, p->egid, p->sgid, p->fsgid);
 181         read_unlock(&tasklist_lock);
 182         task_lock(p);
 183         buffer += sprintf(buffer,
 184                 "FDSize:\t%d\n"
 185                 "Groups:\t",
 186                 p->files ? p->files->max_fds : 0);
 187
 188         group_info = p->group_info;
 189         get_group_info(group_info);
 190         task_unlock(p);
 191
 192         for (g = 0; g < min(group_info->ngroups,NGROUPS_SMALL); g++)
 193                 buffer += sprintf(buffer, "%d ", GROUP_AT(group_info,g));
 194         put_group_info(group_info);
 195
 196         buffer += sprintf(buffer, "\n");
 197         return buffer;
 198 }
 199
 200 static char * render_sigset_t(const char *header, sigset_t *set, char *buffer)
 201 {
 202         int i, len;
 203
 204         len = strlen(header);
 205         memcpy(buffer, header, len);
 206         buffer += len;
 207
 208         i = _NSIG;
 209         do {
 210                 int x = 0;
 211
 212                 i -= 4;
 213                 if (sigismember(set, i+1)) x |= 1;
 214                 if (sigismember(set, i+2)) x |= 2;
 215                 if (sigismember(set, i+3)) x |= 4;
 216                 if (sigismember(set, i+4)) x |= 8;
 217                 *buffer++ = (x < 10 ? '0' : 'a' - 10) + x;
 218         } while (i >= 4);
 219
 220         *buffer++ = '\n';
 221         *buffer = 0;
 222         return buffer;
 223 }
 224
 225 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
 226                                     sigset_t *catch)
 227 {
 228         struct k_sigaction *k;
 229         int i;
 230
 231         k = p->sighand->action;
 232         for (i = 1; i <= _NSIG; ++i, ++k) {
 233                 if (k->sa.sa_handler == SIG_IGN)
 234                         sigaddset(ign, i);
 235                 else if (k->sa.sa_handler != SIG_DFL)
 236                         sigaddset(catch, i);
 237         }
 238 }
 239
 240 static inline char * task_sig(struct task_struct *p, char *buffer)
 241 {
 242         sigset_t pending, shpending, blocked, ignored, caught;
 243         int num_threads = 0;
 244
 245         sigemptyset(&pending);
 246         sigemptyset(&shpending);
 247         sigemptyset(&blocked);
 248         sigemptyset(&ignored);
 249         sigemptyset(&caught);
 250
 251         /* Gather all the data with the appropriate locks held */
 252         read_lock(&tasklist_lock);
 253         if (p->sighand) {
 254                 spin_lock_irq(&p->sighand->siglock);
 255                 pending = p->pending.signal;
 256                 shpending = p->signal->shared_pending.signal;
 257                 blocked = p->blocked;
 258                 collect_sigign_sigcatch(p, &ignored, &caught);
 259                 num_threads = atomic_read(&p->signal->count);
 260                 spin_unlock_irq(&p->sighand->siglock);
 261         }
 262         read_unlock(&tasklist_lock);
 263
 264         buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
 265
 266         /* render them all */
 267         buffer = render_sigset_t("SigPnd:\t", &pending, buffer);
 268         buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer);
 269         buffer = render_sigset_t("SigBlk:\t", &blocked, buffer);
 270         buffer = render_sigset_t("SigIgn:\t", &ignored, buffer);
 271         buffer = render_sigset_t("SigCgt:\t", &caught, buffer);
 272
 273         return buffer;
 274 }
 275
 276 static inline char *task_cap(struct task_struct *p, char *buffer)
 277 {
 278     return buffer + sprintf(buffer, "CapInh:\t%016x\n"
 279                             "CapPrm:\t%016x\n"
 280                             "CapEff:\t%016x\n",
 281                             cap_t(p->cap_inheritable),
 282                             cap_t(p->cap_permitted),
 283                             cap_t(p->cap_effective));
 284 }
 285
 286 extern char *task_mem(struct mm_struct *, char *);
 287 int proc_pid_status(struct task_struct *task, char * buffer)
 288 {
 289         char * orig = buffer;
 290 #ifdef  CONFIG_VSERVER_LEGACY
 291         struct vx_info *vxi;
 292         struct nx_info *nxi;
 293 #endif
 294         struct mm_struct *mm = get_task_mm(task);
 295
 296         buffer = task_name(task, buffer);
 297         buffer = task_state(task, buffer);
 298
 299         if (mm) {
 300                 buffer = task_mem(mm, buffer);
 301                 mmput(mm);
 302         }
 303         buffer = task_sig(task, buffer);
 304         buffer = task_cap(task, buffer);
 305
 306 #ifdef  CONFIG_VSERVER_LEGACY
 307         buffer += sprintf (buffer,"s_context: %d\n", vx_task_xid(task));
 308         vxi = task_get_vx_info(task);
 309         if (vxi) {
 310                 buffer += sprintf (buffer,"ctxflags: %08llx\n"
 311                         ,(unsigned long long)vxi->vx_flags);
 312                 buffer += sprintf (buffer,"initpid: %d\n"
 313                         ,vxi->vx_initpid);
 314         } else {
 315                 buffer += sprintf (buffer,"ctxflags: none\n");
 316                 buffer += sprintf (buffer,"initpid: none\n");
 317         }
 318         put_vx_info(vxi);
 319         nxi = task_get_nx_info(task);
 320         if (nxi) {
 321                 int i;
 322
 323                 buffer += sprintf (buffer,"ipv4root:");
 324                 for (i=0; i<nxi->nbipv4; i++){
 325                         buffer += sprintf (buffer," %08x/%08x"
 326                                 ,nxi->ipv4[i]
 327                                 ,nxi->mask[i]);
 328                 }
 329                 *buffer++ = '\n';
 330                 buffer += sprintf (buffer,"ipv4root_bcast: %08x\n"
 331                         ,nxi->v4_bcast);
 332         } else {
 333                 buffer += sprintf (buffer,"ipv4root: 0\n");
 334                 buffer += sprintf (buffer,"ipv4root_bcast: 0\n");
 335         }
 336         put_nx_info(nxi);
 337 #endif
 338 #if defined(CONFIG_ARCH_S390)
 339         buffer = task_show_regs(task, buffer);
 340 #endif
 341         return buffer - orig;
 342 }
 343
 344 extern unsigned long task_vsize(struct mm_struct *);
 345 int proc_pid_stat(struct task_struct *task, char * buffer)
 346 {
 347         unsigned long vsize, eip, esp, wchan;
 348         long priority, nice;
 349         unsigned long long bias_jiffies;
 350         int tty_pgrp = -1, tty_nr = 0;
 351         sigset_t sigign, sigcatch;
 352         char state;
 353         int res;
 354         pid_t ppid, pgid = -1, sid = -1;
 355         int num_threads = 0;
 356         struct mm_struct *mm;
 357         unsigned long long start_time;
 358
 359         state = *get_task_state(task);
 360         vsize = eip = esp = 0;
 361         bias_jiffies = INITIAL_JIFFIES;
 362
 363         task_lock(task);
 364         if (__vx_task_flags(task, VXF_VIRT_UPTIME, 0)) {
 365                 bias_jiffies = task->vx_info->cvirt.bias_jiffies;
 366                 /* hmm, do we need that? */
 367                 if (bias_jiffies > task->start_time)
 368                         bias_jiffies = task->start_time;
 369         }
 370
 371         mm = task->mm;
 372         if(mm)
 373                 mm = mmgrab(mm);
 374         task_unlock(task);
 375         if (mm) {
 376                 down_read(&mm->mmap_sem);
 377                 vsize = task_vsize(mm);
 378                 eip = KSTK_EIP(task);
 379                 esp = KSTK_ESP(task);
 380                 up_read(&mm->mmap_sem);
 381         }
 382
 383         wchan = 0;
 384         if (current->uid == task->uid || current->euid == task->uid ||
 385                                                         capable(CAP_SYS_NICE))
 386                 wchan = get_wchan(task);
 387
 388         sigemptyset(&sigign);
 389         sigemptyset(&sigcatch);
 390         read_lock(&tasklist_lock);
 391         if (task->sighand) {
 392                 spin_lock_irq(&task->sighand->siglock);
 393                 num_threads = atomic_read(&task->signal->count);
 394                 collect_sigign_sigcatch(task, &sigign, &sigcatch);
 395                 spin_unlock_irq(&task->sighand->siglock);
 396         }
 397         if (task->signal) {
 398                 if (task->signal->tty) {
 399                         tty_pgrp = task->signal->tty->pgrp;
 400                         tty_nr = new_encode_dev(tty_devnum(task->signal->tty));
 401                 }
 402                 pgid = process_group(task);
 403                 sid = task->signal->session;
 404         }
 405         read_unlock(&tasklist_lock);
 406
 407         /* scale priority and nice values from timeslices to -20..20 */
 408         /* to make it look like a "normal" Unix priority/nice value  */
 409         priority = task_prio(task);
 410         nice = task_nice(task);
 411
 412         read_lock(&tasklist_lock);
 413         ppid = task->pid ? task->real_parent->pid : 0;
 414         read_unlock(&tasklist_lock);
 415
 416         /* Temporary variable needed for gcc-2.96 */
 417         start_time = jiffies_64_to_clock_t(task->start_time - bias_jiffies);
 418
 419         res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
 420 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d %ld %llu %lu %ld %lu %lu %lu %lu %lu \
 421 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu\n",
 422                 task->pid,
 423                 task->comm,
 424                 state,
 425                 ppid,
 426                 pgid,
 427                 sid,
 428                 tty_nr,
 429                 tty_pgrp,
 430                 task->flags,
 431                 task->min_flt,
 432                 task->cmin_flt,
 433                 task->maj_flt,
 434                 task->cmaj_flt,
 435                 jiffies_to_clock_t(task->utime),
 436                 jiffies_to_clock_t(task->stime),
 437                 jiffies_to_clock_t(task->cutime),
 438                 jiffies_to_clock_t(task->cstime),
 439                 priority,
 440                 nice,
 441                 num_threads,
 442                 jiffies_to_clock_t(task->it_real_value),
 443                 start_time,
 444                 vsize,
 445                 mm ? mm->rss : 0, /* you might want to shift this left 3 */
 446                 task->rlim[RLIMIT_RSS].rlim_cur,
 447                 mm ? mm->start_code : 0,
 448                 mm ? mm->end_code : 0,
 449                 mm ? mm->start_stack : 0,
 450                 esp,
 451                 eip,
 452                 /* The signal information here is obsolete.
 453                  * It must be decimal for Linux 2.0 compatibility.
 454                  * Use /proc/#/status for real-time signals.
 455                  */
 456                 task->pending.signal.sig[0] & 0x7fffffffUL,
 457                 task->blocked.sig[0] & 0x7fffffffUL,
 458                 sigign      .sig[0] & 0x7fffffffUL,
 459                 sigcatch    .sig[0] & 0x7fffffffUL,
 460                 wchan,
 461                 0UL,
 462                 0UL,
 463                 task->exit_signal,
 464                 task_cpu(task),
 465                 task->rt_priority,
 466                 task->policy);
 467         if(mm)
 468                 mmput(mm);
 469         return res;
 470 }
 471
 472 extern int task_statm(struct mm_struct *, int *, int *, int *, int *);
 473 int proc_pid_statm(struct task_struct *task, char *buffer)
 474 {
 475         int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
 476         struct mm_struct *mm = get_task_mm(task);
 477
 478         if (mm) {
 479                 down_read(&mm->mmap_sem);
 480                 size = task_statm(mm, &shared, &text, &data, &resident);
 481                 up_read(&mm->mmap_sem);
 482
 483                 mmput(mm);
 484         }
 485
 486         return sprintf(buffer,"%d %d %d %d %d %d %d\n",
 487                        size, resident, shared, text, lib, data, 0);
 488 }
 489
 490
 491 int proc_pid_delay(struct task_struct *task, char * buffer)
 492 {
 493         int res;
 494
 495         res  = sprintf(buffer,"%u %llu %llu %u %llu %u %llu\n",
 496                        get_delay(task,runs),
 497                        (unsigned long long)get_delay(task,runcpu_total),
 498                        (unsigned long long)get_delay(task,waitcpu_total),
 499                        get_delay(task,num_iowaits),
 500                        (unsigned long long)get_delay(task,iowait_total),
 501                        get_delay(task,num_memwaits),
 502                        (unsigned long long)get_delay(task,mem_iowait_total)
 503                 );
 504         return res;
 505 }
 506