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