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