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/ninline.h>
  77
  78 #include <asm/uaccess.h>
  79 #include <asm/pgtable.h>
  80 #include <asm/io.h>
  81 #include <asm/processor.h>
  82
  83 /* Gcc optimizes away "strlen(x)" for constant x */
  84 #define ADDBUF(buffer, string) \
  85 do { memcpy(buffer, string, strlen(string)); \
  86      buffer += strlen(string); } while (0)
  87
  88 static inline char * task_name(struct task_struct *p, char * buf)
  89 {
  90         int i;
  91         char * name;
  92
  93         ADDBUF(buf, "Name:\t");
  94         name = p->comm;
  95         i = sizeof(p->comm);
  96         do {
  97                 unsigned char c = *name;
  98                 name++;
  99                 i--;
 100                 *buf = c;
 101                 if (!c)
 102                         break;
 103                 if (c == '\\') {
 104                         buf[1] = c;
 105                         buf += 2;
 106                         continue;
 107                 }
 108                 if (c == '\n') {
 109                         buf[0] = '\\';
 110                         buf[1] = 'n';
 111                         buf += 2;
 112                         continue;
 113                 }
 114                 buf++;
 115         } while (i);
 116         *buf = '\n';
 117         return buf+1;
 118 }
 119
 120 /*
 121  * The task state array is a strange "bitmap" of
 122  * reasons to sleep. Thus "running" is zero, and
 123  * you can test for combinations of others with
 124  * simple bit tests.
 125  */
 126 static const char *task_state_array[] = {
 127         "R (running)",          /*  0 */
 128         "S (sleeping)",         /*  1 */
 129         "D (disk sleep)",       /*  2 */
 130         "T (stopped)",          /*  4 */
 131         "Z (zombie)",           /*  8 */
 132         "X (dead)",             /* 16 */
 133         "H (on hold)"           /* 32 */
 134 };
 135
 136 static inline const char * get_task_state(struct task_struct *tsk)
 137 {
 138         unsigned int state = tsk->state & (TASK_RUNNING |
 139                                            TASK_INTERRUPTIBLE |
 140                                            TASK_UNINTERRUPTIBLE |
 141                                            TASK_ZOMBIE |
 142                                            TASK_STOPPED |
 143                                            TASK_ONHOLD);
 144         const char **p = &task_state_array[0];
 145
 146         while (state) {
 147                 p++;
 148                 state >>= 1;
 149         }
 150         return *p;
 151 }
 152
 153 static inline char * task_state(struct task_struct *p, char *buffer)
 154 {
 155         struct group_info *group_info;
 156         int g;
 157         pid_t ppid;
 158
 159         read_lock(&tasklist_lock);
 160         ppid = vx_map_tgid(current->vx_info, p->real_parent->pid);
 161         buffer += sprintf(buffer,
 162                 "State:\t%s\n"
 163                 "SleepAVG:\t%lu%%\n"
 164                 "Tgid:\t%d\n"
 165                 "Pid:\t%d\n"
 166                 "PPid:\t%d\n"
 167                 "TracerPid:\t%d\n"
 168                 "Uid:\t%d\t%d\t%d\t%d\n"
 169                 "Gid:\t%d\t%d\t%d\t%d\n",
 170                 get_task_state(p),
 171                 (p->sleep_avg/1024)*100/(1020000000/1024),
 172                 p->tgid,
 173                 p->pid, p->pid ? ppid : 0,
 174                 p->pid && p->ptrace ? p->parent->pid : 0,
 175                 p->uid, p->euid, p->suid, p->fsuid,
 176                 p->gid, p->egid, p->sgid, p->fsgid);
 177         read_unlock(&tasklist_lock);
 178         task_lock(p);
 179         buffer += sprintf(buffer,
 180                 "FDSize:\t%d\n"
 181                 "Groups:\t",
 182                 p->files ? p->files->max_fds : 0);
 183
 184         group_info = p->group_info;
 185         get_group_info(group_info);
 186         task_unlock(p);
 187
 188         for (g = 0; g < min(group_info->ngroups,NGROUPS_SMALL); g++)
 189                 buffer += sprintf(buffer, "%d ", GROUP_AT(group_info,g));
 190         put_group_info(group_info);
 191
 192         buffer += sprintf(buffer, "\n");
 193         return buffer;
 194 }
 195
 196 static char * render_sigset_t(const char *header, sigset_t *set, char *buffer)
 197 {
 198         int i, len;
 199
 200         len = strlen(header);
 201         memcpy(buffer, header, len);
 202         buffer += len;
 203
 204         i = _NSIG;
 205         do {
 206                 int x = 0;
 207
 208                 i -= 4;
 209                 if (sigismember(set, i+1)) x |= 1;
 210                 if (sigismember(set, i+2)) x |= 2;
 211                 if (sigismember(set, i+3)) x |= 4;
 212                 if (sigismember(set, i+4)) x |= 8;
 213                 *buffer++ = (x < 10 ? '0' : 'a' - 10) + x;
 214         } while (i >= 4);
 215
 216         *buffer++ = '\n';
 217         *buffer = 0;
 218         return buffer;
 219 }
 220
 221 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
 222                                     sigset_t *catch)
 223 {
 224         struct k_sigaction *k;
 225         int i;
 226
 227         k = p->sighand->action;
 228         for (i = 1; i <= _NSIG; ++i, ++k) {
 229                 if (k->sa.sa_handler == SIG_IGN)
 230                         sigaddset(ign, i);
 231                 else if (k->sa.sa_handler != SIG_DFL)
 232                         sigaddset(catch, i);
 233         }
 234 }
 235
 236 static inline char * task_sig(struct task_struct *p, char *buffer)
 237 {
 238         sigset_t pending, shpending, blocked, ignored, caught;
 239         int num_threads = 0;
 240
 241         sigemptyset(&pending);
 242         sigemptyset(&shpending);
 243         sigemptyset(&blocked);
 244         sigemptyset(&ignored);
 245         sigemptyset(&caught);
 246
 247         /* Gather all the data with the appropriate locks held */
 248         read_lock(&tasklist_lock);
 249         if (p->sighand) {
 250                 spin_lock_irq(&p->sighand->siglock);
 251                 pending = p->pending.signal;
 252                 shpending = p->signal->shared_pending.signal;
 253                 blocked = p->blocked;
 254                 collect_sigign_sigcatch(p, &ignored, &caught);
 255                 num_threads = atomic_read(&p->signal->count);
 256                 spin_unlock_irq(&p->sighand->siglock);
 257         }
 258         read_unlock(&tasklist_lock);
 259
 260         buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
 261
 262         /* render them all */
 263         buffer = render_sigset_t("SigPnd:\t", &pending, buffer);
 264         buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer);
 265         buffer = render_sigset_t("SigBlk:\t", &blocked, buffer);
 266         buffer = render_sigset_t("SigIgn:\t", &ignored, buffer);
 267         buffer = render_sigset_t("SigCgt:\t", &caught, buffer);
 268
 269         return buffer;
 270 }
 271
 272 static inline char *task_cap(struct task_struct *p, char *buffer)
 273 {
 274     return buffer + sprintf(buffer, "CapInh:\t%016x\n"
 275                             "CapPrm:\t%016x\n"
 276                             "CapEff:\t%016x\n",
 277                             cap_t(p->cap_inheritable),
 278                             cap_t(p->cap_permitted),
 279                             cap_t(p->cap_effective));
 280 }
 281
 282 extern char *task_mem(struct mm_struct *, char *);
 283 int proc_pid_status(struct task_struct *task, char * buffer)
 284 {
 285         char * orig = buffer;
 286 #ifdef  CONFIG_VSERVER_LEGACY
 287         struct vx_info *vxi;
 288         struct nx_info *nxi;
 289 #endif
 290         struct mm_struct *mm = get_task_mm(task);
 291
 292         buffer = task_name(task, buffer);
 293         buffer = task_state(task, buffer);
 294
 295         if (mm) {
 296                 buffer = task_mem(mm, buffer);
 297                 mmput(mm);
 298         }
 299         buffer = task_sig(task, buffer);
 300         buffer = task_cap(task, buffer);
 301
 302 #ifdef  CONFIG_VSERVER_LEGACY
 303         buffer += sprintf (buffer,"s_context: %d\n", vx_task_xid(task));
 304         vxi = task_get_vx_info(task);
 305         if (vxi) {
 306                 buffer += sprintf (buffer,"ctxflags: %08llx\n"
 307                         ,vxi->vx_flags);
 308                 buffer += sprintf (buffer,"initpid: %d\n"
 309                         ,vxi->vx_initpid);
 310         } else {
 311                 buffer += sprintf (buffer,"ctxflags: none\n");
 312                 buffer += sprintf (buffer,"initpid: none\n");
 313         }
 314         put_vx_info(vxi);
 315         nxi = task_get_nx_info(task);
 316         if (nxi) {
 317                 int i;
 318
 319                 buffer += sprintf (buffer,"ipv4root:");
 320                 for (i=0; i<nxi->nbipv4; i++){
 321                         buffer += sprintf (buffer," %08x/%08x"
 322                                 ,nxi->ipv4[i]
 323                                 ,nxi->mask[i]);
 324                 }
 325                 *buffer++ = '\n';
 326                 buffer += sprintf (buffer,"ipv4root_bcast: %08x\n"
 327                         ,nxi->v4_bcast);
 328                 buffer += sprintf (buffer,"ipv4root_refcnt: %d\n"
 329                         ,atomic_read(&nxi->nx_refcount));
 330         } else {
 331                 buffer += sprintf (buffer,"ipv4root: 0\n");
 332                 buffer += sprintf (buffer,"ipv4root_bcast: 0\n");
 333         }
 334         put_nx_info(nxi);
 335 #endif
 336 #if defined(CONFIG_ARCH_S390)
 337         buffer = task_show_regs(task, buffer);
 338 #endif
 339         return buffer - orig;
 340 }
 341
 342 extern unsigned long task_vsize(struct mm_struct *);
 343 int proc_pid_stat(struct task_struct *task, char * buffer)
 344 {
 345         unsigned long vsize, eip, esp, wchan;
 346         long priority, nice;
 347         unsigned long long bias_jiffies;
 348         int tty_pgrp = -1, tty_nr = 0;
 349         sigset_t sigign, sigcatch;
 350         char state;
 351         int res;
 352         pid_t ppid, pgid = -1, sid = -1;
 353         int num_threads = 0;
 354         struct mm_struct *mm;
 355         unsigned long long start_time;
 356
 357         state = *get_task_state(task);
 358         vsize = eip = esp = 0;
 359         bias_jiffies = INITIAL_JIFFIES;
 360
 361         task_lock(task);
 362         if (__vx_task_flags(task, VXF_VIRT_UPTIME, 0)) {
 363                 bias_jiffies = task->vx_info->cvirt.bias_jiffies;
 364                 /* hmm, do we need that? */
 365                 if (bias_jiffies > task->start_time)
 366                         bias_jiffies = task->start_time;
 367         }
 368
 369         mm = task->mm;
 370         if(mm)
 371                 mm = mmgrab(mm);
 372         task_unlock(task);
 373         if (mm) {
 374                 down_read(&mm->mmap_sem);
 375                 vsize = task_vsize(mm);
 376                 eip = KSTK_EIP(task);
 377                 esp = KSTK_ESP(task);
 378                 up_read(&mm->mmap_sem);
 379         }
 380
 381         wchan = 0;
 382         if (current->uid == task->uid || current->euid == task->uid ||
 383                                                         capable(CAP_SYS_NICE))
 384                 wchan = get_wchan(task);
 385
 386         sigemptyset(&sigign);
 387         sigemptyset(&sigcatch);
 388         read_lock(&tasklist_lock);
 389         if (task->sighand) {
 390                 spin_lock_irq(&task->sighand->siglock);
 391                 num_threads = atomic_read(&task->signal->count);
 392                 collect_sigign_sigcatch(task, &sigign, &sigcatch);
 393                 spin_unlock_irq(&task->sighand->siglock);
 394         }
 395         if (task->signal) {
 396                 if (task->signal->tty) {
 397                         tty_pgrp = task->signal->tty->pgrp;
 398                         tty_nr = new_encode_dev(tty_devnum(task->signal->tty));
 399                 }
 400                 pgid = process_group(task);
 401                 sid = task->signal->session;
 402         }
 403         read_unlock(&tasklist_lock);
 404
 405         /* scale priority and nice values from timeslices to -20..20 */
 406         /* to make it look like a "normal" Unix priority/nice value  */
 407         priority = task_prio(task);
 408         nice = task_nice(task);
 409
 410         read_lock(&tasklist_lock);
 411         ppid = task->pid ? task->real_parent->pid : 0;
 412         read_unlock(&tasklist_lock);
 413
 414         /* Temporary variable needed for gcc-2.96 */
 415         start_time = jiffies_64_to_clock_t(task->start_time - bias_jiffies);
 416
 417         res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
 418 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d %ld %llu %lu %ld %lu %lu %lu %lu %lu \
 419 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu\n",
 420                 task->pid,
 421                 task->comm,
 422                 state,
 423                 ppid,
 424                 pgid,
 425                 sid,
 426                 tty_nr,
 427                 tty_pgrp,
 428                 task->flags,
 429                 task->min_flt,
 430                 task->cmin_flt,
 431                 task->maj_flt,
 432                 task->cmaj_flt,
 433                 jiffies_to_clock_t(task->utime),
 434                 jiffies_to_clock_t(task->stime),
 435                 jiffies_to_clock_t(task->cutime),
 436                 jiffies_to_clock_t(task->cstime),
 437                 priority,
 438                 nice,
 439                 num_threads,
 440                 jiffies_to_clock_t(task->it_real_value),
 441                 start_time,
 442                 vsize,
 443                 mm ? mm->rss : 0, /* you might want to shift this left 3 */
 444                 task->rlim[RLIMIT_RSS].rlim_cur,
 445                 mm ? mm->start_code : 0,
 446                 mm ? mm->end_code : 0,
 447                 mm ? mm->start_stack : 0,
 448                 esp,
 449                 eip,
 450                 /* The signal information here is obsolete.
 451                  * It must be decimal for Linux 2.0 compatibility.
 452                  * Use /proc/#/status for real-time signals.
 453                  */
 454                 task->pending.signal.sig[0] & 0x7fffffffUL,
 455                 task->blocked.sig[0] & 0x7fffffffUL,
 456                 sigign      .sig[0] & 0x7fffffffUL,
 457                 sigcatch    .sig[0] & 0x7fffffffUL,
 458                 wchan,
 459                 0UL,
 460                 0UL,
 461                 task->exit_signal,
 462                 task_cpu(task),
 463                 task->rt_priority,
 464                 task->policy);
 465         if(mm)
 466                 mmput(mm);
 467         return res;
 468 }
 469
 470 extern int task_statm(struct mm_struct *, int *, int *, int *, int *);
 471 int proc_pid_statm(struct task_struct *task, char *buffer)
 472 {
 473         int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
 474         struct mm_struct *mm = get_task_mm(task);
 475
 476         if (mm) {
 477                 down_read(&mm->mmap_sem);
 478                 size = task_statm(mm, &shared, &text, &data, &resident);
 479                 up_read(&mm->mmap_sem);
 480
 481                 mmput(mm);
 482         }
 483
 484         return sprintf(buffer,"%d %d %d %d %d %d %d\n",
 485                        size, resident, shared, text, lib, data, 0);
 486 }