root/fs/proc/array.c

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DEFINITIONS

This source file includes following definitions.
  1. read_core
  2. get_loadavg
  3. get_kstat
  4. get_uptime
  5. get_meminfo
  6. get_version
  7. get_task
  8. get_phys_addr
  9. get_array
  10. get_env
  11. get_arg
  12. get_wchan
  13. get_stat
  14. get_statm
  15. get_maps
  16. array_read

   1 /*
   2  *  linux/fs/proc/array.c
   3  *
   4  *  Copyright (C) 1992  by Linus Torvalds
   5  *  based on ideas by Darren Senn
   6  *
   7  *  stat,statm extensions by Michael K. Johnson, johnsonm@stolaf.edu
   8  */
   9 
  10 #include <linux/types.h>
  11 #include <linux/errno.h>
  12 #include <linux/sched.h>
  13 #include <linux/kernel.h>
  14 #include <linux/kernel_stat.h>
  15 #include <linux/tty.h>
  16 #include <linux/user.h>
  17 #include <linux/a.out.h>
  18 #include <linux/string.h>
  19 #include <linux/mman.h>
  20 
  21 #include <asm/segment.h>
  22 #include <asm/io.h>
  23 
  24 #define LOAD_INT(x) ((x) >> FSHIFT)
  25 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  26 
  27 #ifdef CONFIG_DEBUG_MALLOC
  28 int get_malloc(char * buffer);
  29 #endif
  30 
  31 static int read_core(struct inode * inode, struct file * file,char * buf, int count)
     /* [previous][next][first][last][top][bottom][index][help] */
  32 {
  33         unsigned long p = file->f_pos;
  34         int read;
  35         int count1;
  36         char * pnt;
  37         struct user dump;
  38 
  39         memset(&dump, 0, sizeof(struct user));
  40         dump.magic = CMAGIC;
  41         dump.u_dsize = high_memory >> 12;
  42 
  43         if (count < 0)
  44                 return -EINVAL;
  45         if (p >= high_memory)
  46                 return 0;
  47         if (count > high_memory - p)
  48                 count = high_memory - p;
  49         read = 0;
  50 
  51         if (p < sizeof(struct user) && count > 0) {
  52                 count1 = count;
  53                 if (p + count1 > sizeof(struct user))
  54                         count1 = sizeof(struct user)-p;
  55                 pnt = (char *) &dump + p;
  56                 memcpy_tofs(buf,(void *) pnt, count1);
  57                 buf += count1;
  58                 p += count1;
  59                 count -= count1;
  60                 read += count1;
  61         }
  62 
  63         while (p < 2*PAGE_SIZE && count > 0) {
  64                 put_fs_byte(0,buf);
  65                 buf++;
  66                 p++;
  67                 count--;
  68                 read++;
  69         }
  70         memcpy_tofs(buf,(void *) (p - PAGE_SIZE),count);
  71         read += count;
  72         file->f_pos += read;
  73         return read;
  74 }
  75 
  76 static int get_loadavg(char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
  77 {
  78         int a, b, c;
  79 
  80         a = avenrun[0] + (FIXED_1/200);
  81         b = avenrun[1] + (FIXED_1/200);
  82         c = avenrun[2] + (FIXED_1/200);
  83         return sprintf(buffer,"%d.%02d %d.%02d %d.%02d\n",
  84                 LOAD_INT(a), LOAD_FRAC(a),
  85                 LOAD_INT(b), LOAD_FRAC(b),
  86                 LOAD_INT(c), LOAD_FRAC(c));
  87 }
  88 
  89 static int get_kstat(char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
  90 {
  91         return sprintf(buffer,  "cpu  %u %u %u %lu\n"
  92                                 "disk %u %u %u %u\n"
  93                                 "page %u %u\n"
  94                                 "swap %u %u\n"
  95                                 "intr %u\n"
  96                                 "ctxt %u\n"
  97                                 "btime %lu\n",
  98                 kstat.cpu_user,
  99                 kstat.cpu_nice,
 100                 kstat.cpu_system,
 101                 jiffies - (kstat.cpu_user + kstat.cpu_nice + kstat.cpu_system),
 102                 kstat.dk_drive[0],
 103                 kstat.dk_drive[1],
 104                 kstat.dk_drive[2],
 105                 kstat.dk_drive[3],
 106                 kstat.pgpgin,
 107                 kstat.pgpgout,
 108                 kstat.pswpin,
 109                 kstat.pswpout,
 110                 kstat.interrupts,
 111                 kstat.context_swtch,
 112                 xtime.tv_sec - jiffies / HZ);
 113 }
 114 
 115 
 116 static int get_uptime(char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 117 {
 118         unsigned long uptime;
 119         unsigned long idle;
 120 
 121         uptime = jiffies;
 122         idle = task[0]->utime + task[0]->stime;
 123         return sprintf(buffer,"%lu.%02lu %lu.%02lu\n",
 124                 uptime / HZ,
 125                 uptime % HZ,
 126                 idle / HZ,
 127                 idle % HZ);
 128 }
 129 
 130 static int get_meminfo(char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 131 {
 132         struct sysinfo i;
 133 
 134         si_meminfo(&i);
 135         si_swapinfo(&i);
 136         return sprintf(buffer, "        total:   used:    free:   shared:  buffers:\n"
 137                 "Mem:  %8lu %8lu %8lu %8lu %8lu\n"
 138                 "Swap: %8lu %8lu %8lu\n",
 139                 i.totalram, i.totalram-i.freeram, i.freeram, i.sharedram, i.bufferram,
 140                 i.totalswap, i.totalswap-i.freeswap, i.freeswap);
 141 }
 142 
 143 static int get_version(char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 144 {
 145         extern char *linux_banner;
 146 
 147         strcpy(buffer, linux_banner);
 148         return strlen(buffer);
 149 }
 150 
 151 static struct task_struct ** get_task(pid_t pid)
     /* [previous][next][first][last][top][bottom][index][help] */
 152 {
 153         struct task_struct ** p;
 154 
 155         p = task;
 156         while (++p < task+NR_TASKS) {
 157                 if (*p && (*p)->pid == pid)
 158                         return p;
 159         }
 160         return NULL;
 161 }
 162 
 163 static unsigned long get_phys_addr(struct task_struct ** p, unsigned long ptr)
     /* [previous][next][first][last][top][bottom][index][help] */
 164 {
 165         unsigned long page;
 166 
 167         if (!p || !*p || ptr >= TASK_SIZE)
 168                 return 0;
 169         page = *PAGE_DIR_OFFSET((*p)->tss.cr3,ptr);
 170         if (!(page & 1))
 171                 return 0;
 172         page &= PAGE_MASK;
 173         page += PAGE_PTR(ptr);
 174         page = *(unsigned long *) page;
 175         if (!(page & 1))
 176                 return 0;
 177         page &= PAGE_MASK;
 178         page += ptr & ~PAGE_MASK;
 179         return page;
 180 }
 181 
 182 static int get_array(struct task_struct ** p, unsigned long start, unsigned long end, char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 183 {
 184         unsigned long addr;
 185         int size = 0, result = 0;
 186         char c;
 187 
 188         if (start >= end)
 189                 return result;
 190         for (;;) {
 191                 addr = get_phys_addr(p, start);
 192                 if (!addr)
 193                         return result;
 194                 do {
 195                         c = *(char *) addr;
 196                         if (!c)
 197                                 result = size;
 198                         if (size < PAGE_SIZE)
 199                                 buffer[size++] = c;
 200                         else
 201                                 return result;
 202                         addr++;
 203                         start++;
 204                         if (start >= end)
 205                                 return result;
 206                 } while (!(addr & ~PAGE_MASK));
 207         }
 208 }
 209 
 210 static int get_env(int pid, char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 211 {
 212         struct task_struct ** p = get_task(pid);
 213 
 214         if (!p || !*p)
 215                 return 0;
 216         return get_array(p, (*p)->env_start, (*p)->env_end, buffer);
 217 }
 218 
 219 static int get_arg(int pid, char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 220 {
 221         struct task_struct ** p = get_task(pid);
 222 
 223         if (!p || !*p)
 224                 return 0;
 225         return get_array(p, (*p)->arg_start, (*p)->arg_end, buffer);
 226 }
 227 
 228 static unsigned long get_wchan(struct task_struct *p)
     /* [previous][next][first][last][top][bottom][index][help] */
 229 {
 230         unsigned long ebp, eip;
 231         unsigned long stack_page;
 232         int count = 0;
 233 
 234         if (!p || p == current || p->state == TASK_RUNNING)
 235                 return 0;
 236         stack_page = p->kernel_stack_page;
 237         if (!stack_page)
 238                 return 0;
 239         ebp = p->tss.ebp;
 240         do {
 241                 if (ebp < stack_page || ebp >= 4092+stack_page)
 242                         return 0;
 243                 eip = *(unsigned long *) (ebp+4);
 244                 if ((void *)eip != sleep_on &&
 245                     (void *)eip != interruptible_sleep_on)
 246                         return eip;
 247                 ebp = *(unsigned long *) ebp;
 248         } while (count++ < 16);
 249         return 0;
 250 }
 251 
 252 #define KSTK_EIP(stack) (((unsigned long *)stack)[1019])
 253 #define KSTK_ESP(stack) (((unsigned long *)stack)[1022])
 254 
 255 static int get_stat(int pid, char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 256 {
 257         struct task_struct ** p = get_task(pid);
 258         unsigned long sigignore=0, sigcatch=0, bit=1, wchan;
 259         unsigned long vsize, eip, esp;
 260         int i,tty_pgrp;
 261         char state;
 262 
 263         if (!p || !*p)
 264                 return 0;
 265         if ((*p)->state < 0 || (*p)->state > 5)
 266                 state = '.';
 267         else
 268                 state = "RSDZTD"[(*p)->state];
 269         eip = esp = 0;
 270         vsize = (*p)->kernel_stack_page;
 271         if (vsize) {
 272                 eip = KSTK_EIP(vsize);
 273                 esp = KSTK_ESP(vsize);
 274                 vsize = (*p)->brk - (*p)->start_code + PAGE_SIZE-1;
 275                 if (esp)
 276                         vsize += TASK_SIZE - esp;
 277         }
 278         wchan = get_wchan(*p);
 279         for(i=0; i<32; ++i) {
 280                 switch((int) (*p)->sigaction[i].sa_handler) {
 281                 case 1: sigignore |= bit; break;
 282                 case 0: break;
 283                 default: sigcatch |= bit;
 284                 } bit <<= 1;
 285         }
 286         tty_pgrp = (*p)->tty;
 287         if (tty_pgrp > 0 && tty_table[tty_pgrp])
 288                 tty_pgrp = tty_table[tty_pgrp]->pgrp;
 289         else
 290                 tty_pgrp = -1;
 291         return sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
 292 %lu %lu %lu %ld %ld %ld %ld %ld %ld %lu %lu %ld %lu %u %u %lu %lu %lu %lu %lu %lu \
 293 %lu %lu %lu %lu\n",
 294                 pid,
 295                 (*p)->comm,
 296                 state,
 297                 (*p)->p_pptr->pid,
 298                 (*p)->pgrp,
 299                 (*p)->session,
 300                 (*p)->tty,
 301                 tty_pgrp,
 302                 (*p)->flags,
 303                 (*p)->min_flt,
 304                 (*p)->cmin_flt,
 305                 (*p)->maj_flt,
 306                 (*p)->cmaj_flt,
 307                 (*p)->utime,
 308                 (*p)->stime,
 309                 (*p)->cutime,
 310                 (*p)->cstime,
 311                 (*p)->counter,  /* this is the kernel priority ---
 312                                    subtract 30 in your user-level program. */
 313                 (*p)->priority, /* this is the nice value ---
 314                                    subtract 15 in your user-level program. */
 315                 (*p)->timeout,
 316                 (*p)->it_real_value,
 317                 (*p)->start_time,
 318                 vsize,
 319                 (*p)->rss, /* you might want to shift this left 3 */
 320                 (*p)->rlim[RLIMIT_RSS].rlim_cur,
 321                 (*p)->start_code,
 322                 (*p)->end_code,
 323                 (*p)->start_stack,
 324                 esp,
 325                 eip,
 326                 (*p)->signal,
 327                 (*p)->blocked,
 328                 sigignore,
 329                 sigcatch,
 330                 wchan);
 331 }
 332 
 333 static int get_statm(int pid, char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 334 {
 335         struct task_struct ** p = get_task(pid);
 336         int i, tpag;
 337         int size=0, resident=0, share=0, trs=0, lrs=0, drs=0, dt=0;
 338         unsigned long ptbl, *buf, *pte, *pagedir, map_nr;
 339 
 340         if (!p || !*p)
 341                 return 0;
 342         tpag = (*p)->end_code / PAGE_SIZE;
 343         if ((*p)->state != TASK_ZOMBIE) {
 344           pagedir = (unsigned long *) (*p)->tss.cr3;
 345           for (i = 0; i < 0x300; ++i) {
 346             if ((ptbl = pagedir[i]) == 0) {
 347               tpag -= PTRS_PER_PAGE;
 348               continue;
 349             }
 350             buf = (unsigned long *)(ptbl & PAGE_MASK);
 351             for (pte = buf; pte < (buf + PTRS_PER_PAGE); ++pte) {
 352               if (*pte != 0) {
 353                 ++size;
 354                 if (*pte & 1) {
 355                   ++resident;
 356                   if (tpag > 0)
 357                     ++trs;
 358                   else
 359                     ++drs;
 360                   if (i >= 15 && i < 0x2f0) {
 361                     ++lrs;
 362                     if (*pte & 0x40)
 363                       ++dt;
 364                     else
 365                       --drs;
 366                   }
 367                   map_nr = MAP_NR(*pte);
 368                   if (map_nr < (high_memory / PAGE_SIZE) && mem_map[map_nr] > 1)
 369                     ++share;
 370                 }
 371               }
 372               --tpag;
 373             }
 374           }
 375         }
 376         return sprintf(buffer,"%d %d %d %d %d %d %d\n",
 377                        size, resident, share, trs, lrs, drs, dt);
 378 }
 379 
 380 static int get_maps(int pid, char *buf)
     /* [previous][next][first][last][top][bottom][index][help] */
 381 {
 382         int sz = 0;
 383         struct task_struct **p = get_task(pid);
 384         struct vm_area_struct *map;
 385 
 386         if (!p || !*p)
 387                 return 0;
 388 
 389         for(map = (*p)->mmap; map != NULL; map = map->vm_next) {
 390                 char str[7], *cp = str;
 391                 int prot = map->vm_page_prot;
 392                 int perms, flags;
 393                 int end = sz + 80;      /* Length of line */
 394                 dev_t dev;
 395                 unsigned long ino;
 396 
 397                 /*
 398                  * This tries to get an "rwxsp" string out of silly
 399                  * intel page permissions.  The vm_area_struct should
 400                  * probably have the original mmap args preserved.
 401                  */
 402                 
 403                 flags = perms = 0;
 404 
 405                 if ((prot & PAGE_READONLY) == PAGE_READONLY)
 406                         perms |= PROT_READ | PROT_EXEC;
 407                 if (prot & (PAGE_COW|PAGE_RW)) {
 408                         perms |= PROT_WRITE | PROT_READ;
 409                         flags = prot & PAGE_COW ? MAP_PRIVATE : MAP_SHARED;
 410                 }
 411 
 412                 *cp++ = perms & PROT_READ ? 'r' : '-';
 413                 *cp++ = perms & PROT_WRITE ? 'w' : '-';
 414                 *cp++ = perms & PROT_EXEC ? 'x' : '-';
 415                 *cp++ = flags & MAP_SHARED ? 's' : '-';
 416                 *cp++ = flags & MAP_PRIVATE ? 'p' : '-';
 417                 *cp++ = 0;
 418                 
 419                 if (end >= PAGE_SIZE) {
 420                         sprintf(buf+sz, "...\n");
 421                         break;
 422                 }
 423                 
 424                 if (map->vm_inode != NULL) {
 425                         dev = map->vm_inode->i_dev;
 426                         ino = map->vm_inode->i_ino;
 427                 } else {
 428                         dev = 0;
 429                         ino = 0;
 430                 }
 431 
 432                 sz += sprintf(buf+sz, "%08lx-%08lx %s %08lx %02x:%02x %lu\n",
 433                               map->vm_start, map->vm_end, str, map->vm_offset,
 434                               MAJOR(dev),MINOR(dev), ino);
 435                 if (sz > end) {
 436                         printk("get_maps: end(%d) < sz(%d)\n", end, sz);
 437                         break;
 438                 }
 439         }
 440         
 441         return sz;
 442 }
 443 
 444 asmlinkage int get_module_list( char *);
 445 
 446 static int array_read(struct inode * inode, struct file * file,char * buf, int count)
     /* [previous][next][first][last][top][bottom][index][help] */
 447 {
 448         char * page;
 449         int length;
 450         int end;
 451         unsigned int type, pid;
 452 
 453         if (count < 0)
 454                 return -EINVAL;
 455         if (!(page = (char*) __get_free_page(GFP_KERNEL)))
 456                 return -ENOMEM;
 457         type = inode->i_ino;
 458         pid = type >> 16;
 459         type &= 0x0000ffff;
 460         switch (type) {
 461                 case 2:
 462                         length = get_loadavg(page);
 463                         break;
 464                 case 3:
 465                         length = get_uptime(page);
 466                         break;
 467                 case 4:
 468                         length = get_meminfo(page);
 469                         break;
 470                 case 6:
 471                         length = get_version(page);
 472                         break;
 473                 case 9:
 474                         length = get_env(pid, page);
 475                         break;
 476                 case 10:
 477                         length = get_arg(pid, page);
 478                         break;
 479                 case 11:
 480                         length = get_stat(pid, page);
 481                         break;
 482                 case 12:
 483                         length = get_statm(pid, page);
 484                         break;
 485 #ifdef CONFIG_DEBUG_MALLOC
 486                 case 13:
 487                         length = get_malloc(page);
 488                         break;
 489 #endif
 490                 case 14:
 491                         free_page((unsigned long) page);
 492                         return read_core(inode, file, buf, count);
 493                 case 15:
 494                         length = get_maps(pid, page);
 495                         break;
 496                 case 16:
 497                         length = get_module_list(page);
 498                         break;
 499                 case 17:
 500                         length = get_kstat(page);
 501                         break;
 502                 default:
 503                         free_page((unsigned long) page);
 504                         return -EBADF;
 505         }
 506         if (file->f_pos >= length) {
 507                 free_page((unsigned long) page);
 508                 return 0;
 509         }
 510         if (count + file->f_pos > length)
 511                 count = length - file->f_pos;
 512         end = count + file->f_pos;
 513         memcpy_tofs(buf, page + file->f_pos, count);
 514         free_page((unsigned long) page);
 515         file->f_pos = end;
 516         return count;
 517 }
 518 
 519 static struct file_operations proc_array_operations = {
 520         NULL,           /* array_lseek */
 521         array_read,
 522         NULL,           /* array_write */
 523         NULL,           /* array_readdir */
 524         NULL,           /* array_select */
 525         NULL,           /* array_ioctl */
 526         NULL,           /* mmap */
 527         NULL,           /* no special open code */
 528         NULL,           /* no special release code */
 529         NULL            /* can't fsync */
 530 };
 531 
 532 struct inode_operations proc_array_inode_operations = {
 533         &proc_array_operations, /* default base directory file-ops */
 534         NULL,                   /* create */
 535         NULL,                   /* lookup */
 536         NULL,                   /* link */
 537         NULL,                   /* unlink */
 538         NULL,                   /* symlink */
 539         NULL,                   /* mkdir */
 540         NULL,                   /* rmdir */
 541         NULL,                   /* mknod */
 542         NULL,                   /* rename */
 543         NULL,                   /* readlink */
 544         NULL,                   /* follow_link */
 545         NULL,                   /* bmap */
 546         NULL,                   /* truncate */
 547         NULL                    /* permission */
 548 };

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