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_STOPPED |
 146                                            TASK_ONHOLD);
 147         const char **p = &task_state_array[0];
 148
 149         while (state) {
 150                 p++;
 151                 state >>= 1;
 152         }
 153         return *p;
 154 }
 155
 156 static inline char * task_state(struct task_struct *p, char *buffer)
 157 {
 158         struct group_info *group_info;
 159         int g;
 160         pid_t ppid;
 161
 162         read_lock(&tasklist_lock);
 163         ppid = vx_map_tgid(current->vx_info, p->real_parent->pid);
 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, p->pid ? ppid : 0,
 177                 p->pid && 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
 244         sigemptyset(&pending);
 245         sigemptyset(&shpending);
 246         sigemptyset(&blocked);
 247         sigemptyset(&ignored);
 248         sigemptyset(&caught);
 249
 250         /* Gather all the data with the appropriate locks held */
 251         read_lock(&tasklist_lock);
 252         if (p->sighand) {
 253                 spin_lock_irq(&p->sighand->siglock);
 254                 pending = p->pending.signal;
 255                 shpending = p->signal->shared_pending.signal;
 256                 blocked = p->blocked;
 257                 collect_sigign_sigcatch(p, &ignored, &caught);
 258                 num_threads = atomic_read(&p->signal->count);
 259                 spin_unlock_irq(&p->sighand->siglock);
 260         }
 261         read_unlock(&tasklist_lock);
 262
 263         buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
 264
 265         /* render them all */
 266         buffer = render_sigset_t("SigPnd:\t", &pending, buffer);
 267         buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer);
 268         buffer = render_sigset_t("SigBlk:\t", &blocked, buffer);
 269         buffer = render_sigset_t("SigIgn:\t", &ignored, buffer);
 270         buffer = render_sigset_t("SigCgt:\t", &caught, buffer);
 271
 272         return buffer;
 273 }
 274
 275 static inline char *task_cap(struct task_struct *p, char *buffer)
 276 {
 277     return buffer + sprintf(buffer, "CapInh:\t%016x\n"
 278                             "CapPrm:\t%016x\n"
 279                             "CapEff:\t%016x\n",
 280                             cap_t(p->cap_inheritable),
 281                             cap_t(p->cap_permitted),
 282                             cap_t(p->cap_effective));
 283 }
 284
 285 extern char *task_mem(struct mm_struct *, char *);
 286 int proc_pid_status(struct task_struct *task, char * buffer)
 287 {
 288         char * orig = buffer;
 289 #ifdef  CONFIG_VSERVER_LEGACY
 290         struct vx_info *vxi;
 291         struct nx_info *nxi;
 292 #endif
 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
 305 #ifdef  CONFIG_VSERVER_LEGACY
 306         buffer += sprintf (buffer,"s_context: %d\n", vx_task_xid(task));
 307         vxi = task_get_vx_info(task);
 308         if (vxi) {
 309                 buffer += sprintf (buffer,"ctxflags: %08llx\n"
 310                         ,(unsigned long long)vxi->vx_flags);
 311                 buffer += sprintf (buffer,"initpid: %d\n"
 312                         ,vxi->vx_initpid);
 313         } else {
 314                 buffer += sprintf (buffer,"ctxflags: none\n");
 315                 buffer += sprintf (buffer,"initpid: none\n");
 316         }
 317         put_vx_info(vxi);
 318         nxi = task_get_nx_info(task);
 319         if (nxi) {
 320                 int i;
 321
 322                 buffer += sprintf (buffer,"ipv4root:");
 323                 for (i=0; i<nxi->nbipv4; i++){
 324                         buffer += sprintf (buffer," %08x/%08x"
 325                                 ,nxi->ipv4[i]
 326                                 ,nxi->mask[i]);
 327                 }
 328                 *buffer++ = '\n';
 329                 buffer += sprintf (buffer,"ipv4root_bcast: %08x\n"
 330                         ,nxi->v4_bcast);
 331         } else {
 332                 buffer += sprintf (buffer,"ipv4root: 0\n");
 333                 buffer += sprintf (buffer,"ipv4root_bcast: 0\n");
 334         }
 335         put_nx_info(nxi);
 336 #endif
 337 #if defined(CONFIG_ARCH_S390)
 338         buffer = task_show_regs(task, buffer);
 339 #endif
 340         return buffer - orig;
 341 }
 342
 343 extern unsigned long task_vsize(struct mm_struct *);
 344 int proc_pid_stat(struct task_struct *task, char * buffer)
 345 {
 346         unsigned long vsize, eip, esp, wchan;
 347         long priority, nice;
 348         unsigned long long bias_jiffies;
 349         int tty_pgrp = -1, tty_nr = 0;
 350         sigset_t sigign, sigcatch;
 351         char state;
 352         int res;
 353         pid_t ppid, pgid = -1, sid = -1;
 354         int num_threads = 0;
 355         struct mm_struct *mm;
 356         unsigned long long start_time;
 357
 358         state = *get_task_state(task);
 359         vsize = eip = esp = 0;
 360         bias_jiffies = INITIAL_JIFFIES;
 361
 362         task_lock(task);
 363         if (__vx_task_flags(task, VXF_VIRT_UPTIME, 0)) {
 364                 bias_jiffies = task->vx_info->cvirt.bias_jiffies;
 365                 /* hmm, do we need that? */
 366                 if (bias_jiffies > task->start_time)
 367                         bias_jiffies = task->start_time;
 368         }
 369
 370         mm = task->mm;
 371         if(mm)
 372                 mm = mmgrab(mm);
 373         task_unlock(task);
 374         if (mm) {
 375                 down_read(&mm->mmap_sem);
 376                 vsize = task_vsize(mm);
 377                 eip = KSTK_EIP(task);
 378                 esp = KSTK_ESP(task);
 379                 up_read(&mm->mmap_sem);
 380         }
 381
 382         wchan = get_wchan(task);
 383
 384         sigemptyset(&sigign);
 385         sigemptyset(&sigcatch);
 386         read_lock(&tasklist_lock);
 387         if (task->sighand) {
 388                 spin_lock_irq(&task->sighand->siglock);
 389                 num_threads = atomic_read(&task->signal->count);
 390                 collect_sigign_sigcatch(task, &sigign, &sigcatch);
 391                 spin_unlock_irq(&task->sighand->siglock);
 392         }
 393         if (task->signal) {
 394                 if (task->signal->tty) {
 395                         tty_pgrp = task->signal->tty->pgrp;
 396                         tty_nr = new_encode_dev(tty_devnum(task->signal->tty));
 397                 }
 398                 pgid = process_group(task);
 399                 sid = task->signal->session;
 400         }
 401         read_unlock(&tasklist_lock);
 402
 403         /* scale priority and nice values from timeslices to -20..20 */
 404         /* to make it look like a "normal" Unix priority/nice value  */
 405         priority = task_prio(task);
 406         nice = task_nice(task);
 407
 408         read_lock(&tasklist_lock);
 409         ppid = task->pid ? task->real_parent->pid : 0;
 410         read_unlock(&tasklist_lock);
 411
 412         /* Temporary variable needed for gcc-2.96 */
 413         start_time = jiffies_64_to_clock_t(task->start_time - bias_jiffies);
 414
 415         res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
 416 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d %ld %llu %lu %ld %lu %lu %lu %lu %lu \
 417 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu\n",
 418                 task->pid,
 419                 task->comm,
 420                 state,
 421                 ppid,
 422                 pgid,
 423                 sid,
 424                 tty_nr,
 425                 tty_pgrp,
 426                 task->flags,
 427                 task->min_flt,
 428                 task->cmin_flt,
 429                 task->maj_flt,
 430                 task->cmaj_flt,
 431                 jiffies_to_clock_t(task->utime),
 432                 jiffies_to_clock_t(task->stime),
 433                 jiffies_to_clock_t(task->cutime),
 434                 jiffies_to_clock_t(task->cstime),
 435                 priority,
 436                 nice,
 437                 num_threads,
 438                 jiffies_to_clock_t(task->it_real_value),
 439                 start_time,
 440                 vsize,
 441                 mm ? mm->rss : 0, /* you might want to shift this left 3 */
 442                 task->rlim[RLIMIT_RSS].rlim_cur,
 443                 mm ? mm->start_code : 0,
 444                 mm ? mm->end_code : 0,
 445                 mm ? mm->start_stack : 0,
 446                 esp,
 447                 eip,
 448                 /* The signal information here is obsolete.
 449                  * It must be decimal for Linux 2.0 compatibility.
 450                  * Use /proc/#/status for real-time signals.
 451                  */
 452                 task->pending.signal.sig[0] & 0x7fffffffUL,
 453                 task->blocked.sig[0] & 0x7fffffffUL,
 454                 sigign      .sig[0] & 0x7fffffffUL,
 455                 sigcatch    .sig[0] & 0x7fffffffUL,
 456                 wchan,
 457                 0UL,
 458                 0UL,
 459                 task->exit_signal,
 460                 task_cpu(task),
 461                 task->rt_priority,
 462                 task->policy);
 463         if(mm)
 464                 mmput(mm);
 465         return res;
 466 }
 467
 468 extern int task_statm(struct mm_struct *, int *, int *, int *, int *);
 469 int proc_pid_statm(struct task_struct *task, char *buffer)
 470 {
 471         int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
 472         struct mm_struct *mm = get_task_mm(task);
 473
 474         if (mm) {
 475                 down_read(&mm->mmap_sem);
 476                 size = task_statm(mm, &shared, &text, &data, &resident);
 477                 up_read(&mm->mmap_sem);
 478
 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 }