root/fs/proc/array.c

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DEFINITIONS

This source file includes following definitions.
  1. read_core
  2. read_profile
  3. write_profile
  4. get_loadavg
  5. get_kstat
  6. get_uptime
  7. get_meminfo
  8. get_version
  9. get_cpuinfo
  10. get_task
  11. get_phys_addr
  12. get_array
  13. get_env
  14. get_arg
  15. get_wchan
  16. get_stat
  17. statm_pte_range
  18. statm_pmd_range
  19. statm_pgd_range
  20. get_statm
  21. read_maps
  22. get_root_array
  23. get_process_array
  24. fill_array
  25. array_read
  26. arraylong_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  * 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    :  Some minor additions for cpuinfo
  18  *                      <danny@ow.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 
  30 #include <linux/types.h>
  31 #include <linux/errno.h>
  32 #include <linux/sched.h>
  33 #include <linux/kernel.h>
  34 #include <linux/kernel_stat.h>
  35 #include <linux/tty.h>
  36 #include <linux/user.h>
  37 #include <linux/a.out.h>
  38 #include <linux/string.h>
  39 #include <linux/mman.h>
  40 #include <linux/proc_fs.h>
  41 #include <linux/ioport.h>
  42 #include <linux/config.h>
  43 #include <linux/delay.h>
  44 #include <linux/mm.h>
  45 
  46 #include <asm/segment.h>
  47 #include <asm/pgtable.h>
  48 #include <asm/io.h>
  49 
  50 #define LOAD_INT(x) ((x) >> FSHIFT)
  51 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  52 
  53 #ifdef CONFIG_DEBUG_MALLOC
  54 int get_malloc(char * buffer);
  55 #endif
  56 
  57 
  58 static int read_core(struct inode * inode, struct file * file,char * buf, int count)
     /* [previous][next][first][last][top][bottom][index][help] */
  59 {
  60         unsigned long p = file->f_pos;
  61         int read;
  62         int count1;
  63         char * pnt;
  64         struct user dump;
  65 
  66         memset(&dump, 0, sizeof(struct user));
  67         dump.magic = CMAGIC;
  68         dump.u_dsize = high_memory >> 12;
  69 
  70         if (count < 0)
  71                 return -EINVAL;
  72         if (p >= high_memory + PAGE_SIZE)
  73                 return 0;
  74         if (count > high_memory + PAGE_SIZE - p)
  75                 count = high_memory + PAGE_SIZE - p;
  76         read = 0;
  77 
  78         if (p < sizeof(struct user) && count > 0) {
  79                 count1 = count;
  80                 if (p + count1 > sizeof(struct user))
  81                         count1 = sizeof(struct user)-p;
  82                 pnt = (char *) &dump + p;
  83                 memcpy_tofs(buf,(void *) pnt, count1);
  84                 buf += count1;
  85                 p += count1;
  86                 count -= count1;
  87                 read += count1;
  88         }
  89 
  90         while (p < 2*PAGE_SIZE && count > 0) {
  91                 put_fs_byte(0,buf);
  92                 buf++;
  93                 p++;
  94                 count--;
  95                 read++;
  96         }
  97         memcpy_tofs(buf,(void *) (p - PAGE_SIZE),count);
  98         read += count;
  99         file->f_pos += read;
 100         return read;
 101 }
 102 
 103 static struct file_operations proc_kcore_operations = {
 104         NULL,           /* lseek */
 105         read_core,
 106 };
 107 
 108 struct inode_operations proc_kcore_inode_operations = {
 109         &proc_kcore_operations, 
 110 };
 111 
 112 
 113 #ifdef CONFIG_PROFILE
 114 
 115 extern unsigned long prof_len;
 116 extern unsigned long * prof_buffer;
 117 /*
 118  * This function accesses profiling information. The returned data is
 119  * binary: the sampling step and the actual contents of the profile
 120  * buffer. Use of the program readprofile is recommended in order to
 121  * get meaningful info out of these data.
 122  */
 123 static int read_profile(struct inode *inode, struct file *file, char *buf, int count)
     /* [previous][next][first][last][top][bottom][index][help] */
 124 {
 125     unsigned long p = file->f_pos;
 126         int read;
 127         char * pnt;
 128         unsigned long sample_step = 1 << CONFIG_PROFILE_SHIFT;
 129 
 130         if (count < 0)
 131             return -EINVAL;
 132         if (p >= (prof_len+1)*sizeof(unsigned long))
 133             return 0;
 134         if (count > (prof_len+1)*sizeof(unsigned long) - p)
 135             count = (prof_len+1)*sizeof(unsigned long) - p;
 136     read = 0;
 137 
 138     while (p < sizeof(unsigned long) && count > 0) {
 139         put_fs_byte(*((char *)(&sample_step)+p),buf);
 140                 buf++; p++; count--; read++;
 141     }
 142     pnt = (char *)prof_buffer + p - sizeof(unsigned long);
 143         memcpy_tofs(buf,(void *)pnt,count);
 144         read += count;
 145         file->f_pos += read;
 146         return read;
 147 }
 148 
 149 /* Writing to /proc/profile resets the counters */
 150 static int write_profile(struct inode * inode, struct file * file, char * buf, int count)
     /* [previous][next][first][last][top][bottom][index][help] */
 151 {
 152     int i=prof_len;
 153 
 154     while (i--)
 155             prof_buffer[i]=0UL;
 156     return count;
 157 }
 158 
 159 static struct file_operations proc_profile_operations = {
 160         NULL,           /* lseek */
 161         read_profile,
 162         write_profile,
 163 };
 164 
 165 struct inode_operations proc_profile_inode_operations = {
 166         &proc_profile_operations, 
 167 };
 168 
 169 #endif /* CONFIG_PROFILE */
 170 
 171 
 172 static int get_loadavg(char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 173 {
 174         int a, b, c;
 175 
 176         a = avenrun[0] + (FIXED_1/200);
 177         b = avenrun[1] + (FIXED_1/200);
 178         c = avenrun[2] + (FIXED_1/200);
 179         return sprintf(buffer,"%d.%02d %d.%02d %d.%02d %d/%d\n",
 180                 LOAD_INT(a), LOAD_FRAC(a),
 181                 LOAD_INT(b), LOAD_FRAC(b),
 182                 LOAD_INT(c), LOAD_FRAC(c),
 183                 nr_running, nr_tasks);
 184 }
 185 
 186 static int get_kstat(char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 187 {
 188         int i, len;
 189         unsigned sum = 0;
 190 
 191         for (i = 0 ; i < 16 ; i++)
 192                 sum += kstat.interrupts[i];
 193         len = sprintf(buffer,
 194                 "cpu  %u %u %u %lu\n"
 195                 "disk %u %u %u %u\n"
 196                 "page %u %u\n"
 197                 "swap %u %u\n"
 198                 "intr %u",
 199                 kstat.cpu_user,
 200                 kstat.cpu_nice,
 201                 kstat.cpu_system,
 202                 jiffies - (kstat.cpu_user + kstat.cpu_nice + kstat.cpu_system),
 203                 kstat.dk_drive[0],
 204                 kstat.dk_drive[1],
 205                 kstat.dk_drive[2],
 206                 kstat.dk_drive[3],
 207                 kstat.pgpgin,
 208                 kstat.pgpgout,
 209                 kstat.pswpin,
 210                 kstat.pswpout,
 211                 sum);
 212         for (i = 0 ; i < 16 ; i++)
 213                 len += sprintf(buffer + len, " %u", kstat.interrupts[i]);
 214         len += sprintf(buffer + len,
 215                 "\nctxt %u\n"
 216                 "btime %lu\n",
 217                 kstat.context_swtch,
 218                 xtime.tv_sec - jiffies / HZ);
 219         return len;
 220 }
 221 
 222 
 223 static int get_uptime(char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 224 {
 225         unsigned long uptime;
 226         unsigned long idle;
 227 
 228         uptime = jiffies;
 229         idle = task[0]->utime + task[0]->stime;
 230 
 231         /* The formula for the fraction parts really is ((t * 100) / HZ) % 100, but
 232            that would overflow about every five days at HZ == 100.
 233            Therefore the identity a = (a / b) * b + a % b is used so that it is
 234            calculated as (((t / HZ) * 100) + ((t % HZ) * 100) / HZ) % 100.
 235            The part in front of the '+' always evaluates as 0 (mod 100). All divisions
 236            in the above formulas are truncating. For HZ being a power of 10, the
 237            calculations simplify to the version in the #else part (if the printf
 238            format is adapted to the same number of digits as zeroes in HZ.
 239          */
 240 #if HZ!=100
 241         return sprintf(buffer,"%lu.%02lu %lu.%02lu\n",
 242                 uptime / HZ,
 243                 (((uptime % HZ) * 100) / HZ) % 100,
 244                 idle / HZ,
 245                 (((idle % HZ) * 100) / HZ) % 100);
 246 #else
 247         return sprintf(buffer,"%lu.%02lu %lu.%02lu\n",
 248                 uptime / HZ,
 249                 uptime % HZ,
 250                 idle / HZ,
 251                 idle % HZ);
 252 #endif
 253 }
 254 
 255 static int get_meminfo(char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 256 {
 257         struct sysinfo i;
 258 
 259         si_meminfo(&i);
 260         si_swapinfo(&i);
 261         return sprintf(buffer, "        total:   used:    free:   shared:  buffers:\n"
 262                 "Mem:  %8lu %8lu %8lu %8lu %8lu\n"
 263                 "Swap: %8lu %8lu %8lu\n",
 264                 i.totalram, i.totalram-i.freeram, i.freeram, i.sharedram, i.bufferram,
 265                 i.totalswap, i.totalswap-i.freeswap, i.freeswap);
 266 }
 267 
 268 static int get_version(char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 269 {
 270         extern char *linux_banner;
 271 
 272         strcpy(buffer, linux_banner);
 273         return strlen(buffer);
 274 }
 275 
 276 static int get_cpuinfo(char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 277 {
 278 #ifdef __i386__
 279         char *model[2][9]={{"DX","SX","DX/2","4","SX/2","6",
 280                                 "DX/2-WB","DX/4"},
 281                         {"Pentium 60/66","Pentium 90/100","3",
 282                                 "4","5","6","7","8"}};
 283         char mask[2];
 284         mask[0] = x86_mask+'@';
 285         mask[1] = '\0';
 286         return sprintf(buffer,"cpu\t\t: %c86\n"
 287                               "model\t\t: %s\n"
 288                               "mask\t\t: %s\n"
 289                               "vid\t\t: %s\n"
 290                               "fdiv_bug\t: %s\n"
 291                               "math\t\t: %s\n"
 292                               "hlt\t\t: %s\n"
 293                               "wp\t\t: %s\n"
 294                               "Integrated NPU\t: %s\n"
 295                               "Enhanced VM86\t: %s\n"
 296                               "IO Breakpoints\t: %s\n"
 297                               "4MB Pages\t: %s\n"
 298                               "TS Counters\t: %s\n"
 299                               "Pentium MSR\t: %s\n"
 300                               "Mach. Ch. Exep.\t: %s\n"
 301                               "CMPXCHGB8B\t: %s\n"
 302                               "BogoMips\t: %lu.%02lu\n",
 303                               x86+'0', 
 304                               x86_model ? model[x86-4][x86_model-1] : "Unknown",
 305                               x86_mask ? mask : "Unknown",
 306                               x86_vendor_id,
 307                               fdiv_bug ? "yes" : "no",
 308                               hard_math ? "yes" : "no",
 309                               hlt_works_ok ? "yes" : "no",
 310                               wp_works_ok ? "yes" : "no",
 311                               x86_capability & 1 ? "yes" : "no",
 312                               x86_capability & 2 ? "yes" : "no",
 313                               x86_capability & 4 ? "yes" : "no",
 314                               x86_capability & 8 ? "yes" : "no",
 315                               x86_capability & 16 ? "yes" : "no",
 316                               x86_capability & 32 ? "yes" : "no",
 317                               x86_capability & 128 ? "yes" : "no",
 318                               x86_capability & 256 ? "yes" : "no",
 319                               loops_per_sec/500000, (loops_per_sec/5000) % 100
 320                               );
 321 #else
 322         return 0;
 323 #endif
 324 }
 325 
 326 static struct task_struct ** get_task(pid_t pid)
     /* [previous][next][first][last][top][bottom][index][help] */
 327 {
 328         struct task_struct ** p;
 329 
 330         p = task;
 331         while (++p < task+NR_TASKS) {
 332                 if (*p && (*p)->pid == pid)
 333                         return p;
 334         }
 335         return NULL;
 336 }
 337 
 338 static unsigned long get_phys_addr(struct task_struct * p, unsigned long ptr)
     /* [previous][next][first][last][top][bottom][index][help] */
 339 {
 340         pgd_t *page_dir;
 341         pmd_t *page_middle;
 342         pte_t pte;
 343 
 344         if (!p || ptr >= TASK_SIZE)
 345                 return 0;
 346         page_dir = pgd_offset(p,ptr);
 347         if (pgd_none(*page_dir))
 348                 return 0;
 349         if (pgd_bad(*page_dir)) {
 350                 printk("bad page directory entry %08lx\n", pgd_val(*page_dir));
 351                 pgd_clear(page_dir);
 352                 return 0;
 353         }
 354         page_middle = pmd_offset(page_dir,ptr);
 355         if (pmd_none(*page_middle))
 356                 return 0;
 357         if (pmd_bad(*page_middle)) {
 358                 printk("bad page middle entry %08lx\n", pmd_val(*page_middle));
 359                 pmd_clear(page_middle);
 360                 return 0;
 361         }
 362         pte = *pte_offset(page_middle,ptr);
 363         if (!pte_present(pte))
 364                 return 0;
 365         return pte_page(pte) + (ptr & ~PAGE_MASK);
 366 }
 367 
 368 static int get_array(struct task_struct ** p, unsigned long start, unsigned long end, char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 369 {
 370         unsigned long addr;
 371         int size = 0, result = 0;
 372         char c;
 373 
 374         if (start >= end)
 375                 return result;
 376         for (;;) {
 377                 addr = get_phys_addr(*p, start);
 378                 if (!addr)
 379                         goto ready;
 380                 do {
 381                         c = *(char *) addr;
 382                         if (!c)
 383                                 result = size;
 384                         if (size < PAGE_SIZE)
 385                                 buffer[size++] = c;
 386                         else
 387                                 goto ready;
 388                         addr++;
 389                         start++;
 390                         if (!c && start >= end)
 391                                 goto ready;
 392                 } while (addr & ~PAGE_MASK);
 393         }
 394 ready:
 395         /* remove the trailing blanks, used to fill out argv,envp space */
 396         while (result>0 && buffer[result-1]==' ')
 397                 result--;
 398         return result;
 399 }
 400 
 401 static int get_env(int pid, char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 402 {
 403         struct task_struct ** p = get_task(pid);
 404 
 405         if (!p || !*p)
 406                 return 0;
 407         return get_array(p, (*p)->mm->env_start, (*p)->mm->env_end, buffer);
 408 }
 409 
 410 static int get_arg(int pid, char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 411 {
 412         struct task_struct ** p = get_task(pid);
 413 
 414         if (!p || !*p)
 415                 return 0;
 416         return get_array(p, (*p)->mm->arg_start, (*p)->mm->arg_end, buffer);
 417 }
 418 
 419 static unsigned long get_wchan(struct task_struct *p)
     /* [previous][next][first][last][top][bottom][index][help] */
 420 {
 421 #ifdef __i386__
 422         unsigned long ebp, eip;
 423         unsigned long stack_page;
 424         int count = 0;
 425 
 426         if (!p || p == current || p->state == TASK_RUNNING)
 427                 return 0;
 428         stack_page = p->kernel_stack_page;
 429         if (!stack_page)
 430                 return 0;
 431         ebp = p->tss.ebp;
 432         do {
 433                 if (ebp < stack_page || ebp >= 4092+stack_page)
 434                         return 0;
 435                 eip = *(unsigned long *) (ebp+4);
 436                 if ((void *)eip != sleep_on &&
 437                     (void *)eip != interruptible_sleep_on)
 438                         return eip;
 439                 ebp = *(unsigned long *) ebp;
 440         } while (count++ < 16);
 441 #endif
 442         return 0;
 443 }
 444 
 445 #define KSTK_EIP(stack) (((unsigned long *)stack)[1019])
 446 #define KSTK_ESP(stack) (((unsigned long *)stack)[1022])
 447 
 448 static int get_stat(int pid, char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 449 {
 450         struct task_struct ** p = get_task(pid);
 451         unsigned long sigignore=0, sigcatch=0, bit=1, wchan;
 452         unsigned long vsize, eip, esp;
 453         int i,tty_pgrp;
 454         char state;
 455 
 456         if (!p || !*p)
 457                 return 0;
 458         if ((*p)->state < 0 || (*p)->state > 5)
 459                 state = '.';
 460         else
 461                 state = "RSDZTD"[(*p)->state];
 462         eip = esp = 0;
 463         vsize = (*p)->kernel_stack_page;
 464         if (vsize) {
 465                 eip = KSTK_EIP(vsize);
 466                 esp = KSTK_ESP(vsize);
 467                 vsize = (*p)->mm->brk - (*p)->mm->start_code + PAGE_SIZE-1;
 468                 if (esp)
 469                         vsize += TASK_SIZE - esp;
 470         }
 471         wchan = get_wchan(*p);
 472         for(i=0; i<32; ++i) {
 473                 switch((unsigned long) (*p)->sigaction[i].sa_handler) {
 474                 case 1: sigignore |= bit; break;
 475                 case 0: break;
 476                 default: sigcatch |= bit;
 477                 } bit <<= 1;
 478         }
 479         if ((*p)->tty)
 480                 tty_pgrp = (*p)->tty->pgrp;
 481         else
 482                 tty_pgrp = -1;
 483         return sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
 484 %lu %lu %lu %ld %ld %ld %ld %ld %ld %lu %lu %ld %lu %lu %lu %lu %lu %lu %lu %lu %lu \
 485 %lu %lu %lu %lu\n",
 486                 pid,
 487                 (*p)->comm,
 488                 state,
 489                 (*p)->p_pptr->pid,
 490                 (*p)->pgrp,
 491                 (*p)->session,
 492                 (*p)->tty ? (*p)->tty->device : 0,
 493                 tty_pgrp,
 494                 (*p)->flags,
 495                 (*p)->mm->min_flt,
 496                 (*p)->mm->cmin_flt,
 497                 (*p)->mm->maj_flt,
 498                 (*p)->mm->cmaj_flt,
 499                 (*p)->utime,
 500                 (*p)->stime,
 501                 (*p)->cutime,
 502                 (*p)->cstime,
 503                 (*p)->counter,  /* this is the kernel priority ---
 504                                    subtract 30 in your user-level program. */
 505                 (*p)->priority, /* this is the nice value ---
 506                                    subtract 15 in your user-level program. */
 507                 (*p)->timeout,
 508                 (*p)->it_real_value,
 509                 (*p)->start_time,
 510                 vsize,
 511                 (*p)->mm->rss, /* you might want to shift this left 3 */
 512                 (*p)->rlim[RLIMIT_RSS].rlim_cur,
 513                 (*p)->mm->start_code,
 514                 (*p)->mm->end_code,
 515                 (*p)->mm->start_stack,
 516                 esp,
 517                 eip,
 518                 (*p)->signal,
 519                 (*p)->blocked,
 520                 sigignore,
 521                 sigcatch,
 522                 wchan);
 523 }
 524                 
 525 static inline void statm_pte_range(pmd_t * pmd, unsigned long address, unsigned long size,
     /* [previous][next][first][last][top][bottom][index][help] */
 526         int * pages, int * shared, int * dirty, int * total)
 527 {
 528         pte_t * pte;
 529         unsigned long end;
 530 
 531         if (pmd_none(*pmd))
 532                 return;
 533         if (pmd_bad(*pmd)) {
 534                 printk("statm_pte_range: bad pmd (%08lx)\n", pmd_val(*pmd));
 535                 pmd_clear(pmd);
 536                 return;
 537         }
 538         pte = pte_offset(pmd, address);
 539         address &= ~PMD_MASK;
 540         end = address + size;
 541         if (end > PMD_SIZE)
 542                 end = PMD_SIZE;
 543         do {
 544                 pte_t page = *pte;
 545 
 546                 address += PAGE_SIZE;
 547                 pte++;
 548                 if (pte_none(page))
 549                         continue;
 550                 ++*total;
 551                 if (!pte_present(page))
 552                         continue;
 553                 ++*pages;
 554                 if (pte_dirty(page))
 555                         ++*dirty;
 556                 if (pte_page(page) >= high_memory)
 557                         continue;
 558                 if (mem_map[MAP_NR(pte_page(page))] > 1)
 559                         ++*shared;
 560         } while (address < end);
 561 }
 562 
 563 static inline void statm_pmd_range(pgd_t * pgd, unsigned long address, unsigned long size,
     /* [previous][next][first][last][top][bottom][index][help] */
 564         int * pages, int * shared, int * dirty, int * total)
 565 {
 566         pmd_t * pmd;
 567         unsigned long end;
 568 
 569         if (pgd_none(*pgd))
 570                 return;
 571         if (pgd_bad(*pgd)) {
 572                 printk("statm_pmd_range: bad pgd (%08lx)\n", pgd_val(*pgd));
 573                 pgd_clear(pgd);
 574                 return;
 575         }
 576         pmd = pmd_offset(pgd, address);
 577         address &= ~PGDIR_MASK;
 578         end = address + size;
 579         if (end > PGDIR_SIZE)
 580                 end = PGDIR_SIZE;
 581         do {
 582                 statm_pte_range(pmd, address, end - address, pages, shared, dirty, total);
 583                 address = (address + PMD_SIZE) & PMD_MASK;
 584                 pmd++;
 585         } while (address < end);
 586 }
 587 
 588 static void statm_pgd_range(pgd_t * pgd, unsigned long address, unsigned long end,
     /* [previous][next][first][last][top][bottom][index][help] */
 589         int * pages, int * shared, int * dirty, int * total)
 590 {
 591         while (address < end) {
 592                 statm_pmd_range(pgd, address, end - address, pages, shared, dirty, total);
 593                 address = (address + PGDIR_SIZE) & PGDIR_MASK;
 594                 pgd++;
 595         }
 596 }
 597 
 598 static int get_statm(int pid, char * buffer)
     /* [previous][next][first][last][top][bottom][index][help] */
 599 {
 600         struct task_struct ** p = get_task(pid);
 601         int size=0, resident=0, share=0, trs=0, lrs=0, drs=0, dt=0;
 602 
 603         if (!p || !*p)
 604                 return 0;
 605         if ((*p)->state != TASK_ZOMBIE) {
 606                 struct vm_area_struct * vma = (*p)->mm->mmap;
 607 
 608                 while (vma) {
 609                         pgd_t *pgd = pgd_offset(*p, vma->vm_start);
 610                         int pages = 0, shared = 0, dirty = 0, total = 0;
 611 
 612                         statm_pgd_range(pgd, vma->vm_start, vma->vm_end, &pages, &shared, &dirty, &total);
 613                         resident += pages;
 614                         share += shared;
 615                         dt += dirty;
 616                         size += total;
 617                         if (vma->vm_flags & VM_EXECUTABLE)
 618                                 trs += pages;   /* text */
 619                         else if (vma->vm_flags & VM_GROWSDOWN)
 620                                 drs += pages;   /* stack */
 621                         else if (vma->vm_end > 0x60000000)
 622                                 lrs += pages;   /* library */
 623                         else
 624                                 drs += pages;
 625                         vma = vma->vm_next;
 626                 }
 627         }
 628         return sprintf(buffer,"%d %d %d %d %d %d %d\n",
 629                        size, resident, share, trs, lrs, drs, dt);
 630 }
 631 
 632 /*
 633  * The way we support synthetic files > 4K
 634  * - without storing their contents in some buffer and
 635  * - without walking through the entire synthetic file until we reach the
 636  *   position of the requested data
 637  * is to cleverly encode the current position in the file's f_pos field.
 638  * There is no requirement that a read() call which returns `count' bytes
 639  * of data increases f_pos by exactly `count'.
 640  *
 641  * This idea is Linus' one. Bruno implemented it.
 642  */
 643 
 644 /*
 645  * For the /proc/<pid>/maps file, we use fixed length records, each containing
 646  * a single line.
 647  */
 648 #define MAPS_LINE_LENGTH        1024
 649 #define MAPS_LINE_SHIFT         10
 650 /*
 651  * f_pos = (number of the vma in the task->mm->mmap list) * MAPS_LINE_LENGTH
 652  *         + (index into the line)
 653  */
 654 #define MAPS_LINE_FORMAT          "%08lx-%08lx %s %08lx %02x:%02x %lu\n"
 655 #define MAPS_LINE_MAX   49 /* sum of 8  1  8  1 4 1 8  1  2 1  2 1 10 1 */
 656 
 657 static int read_maps (int pid, struct file * file, char * buf, int count)
     /* [previous][next][first][last][top][bottom][index][help] */
 658 {
 659         struct task_struct ** p = get_task(pid);
 660         char * destptr;
 661         loff_t lineno;
 662         int column;
 663         struct vm_area_struct * map;
 664         int i;
 665 
 666         if (!p || !*p)
 667                 return -EINVAL;
 668 
 669         if (count == 0)
 670                 return 0;
 671 
 672         /* decode f_pos */
 673         lineno = file->f_pos >> MAPS_LINE_SHIFT;
 674         column = file->f_pos & (MAPS_LINE_LENGTH-1);
 675 
 676         /* quickly go to line lineno */
 677         for (map = (*p)->mm->mmap, i = 0; map && (i < lineno); map = map->vm_next, i++)
 678                 continue;
 679 
 680         destptr = buf;
 681 
 682         for ( ; map ; ) {
 683                 /* produce the next line */
 684                 char line[MAPS_LINE_MAX+1];
 685                 char str[5], *cp = str;
 686                 int flags;
 687                 dev_t dev;
 688                 unsigned long ino;
 689                 int len;
 690 
 691                 flags = map->vm_flags;
 692 
 693                 *cp++ = flags & VM_READ ? 'r' : '-';
 694                 *cp++ = flags & VM_WRITE ? 'w' : '-';
 695                 *cp++ = flags & VM_EXEC ? 'x' : '-';
 696                 *cp++ = flags & VM_MAYSHARE ? 's' : 'p';
 697                 *cp++ = 0;
 698 
 699                 if (map->vm_inode != NULL) {
 700                         dev = map->vm_inode->i_dev;
 701                         ino = map->vm_inode->i_ino;
 702                 } else {
 703                         dev = 0;
 704                         ino = 0;
 705                 }
 706 
 707                 len = sprintf(line, MAPS_LINE_FORMAT,
 708                               map->vm_start, map->vm_end, str, map->vm_offset,
 709                               MAJOR(dev),MINOR(dev), ino);
 710 
 711                 if (column >= len) {
 712                         column = 0; /* continue with next line at column 0 */
 713                         lineno++;
 714                         map = map->vm_next;
 715                         continue;
 716                 }
 717 
 718                 i = len-column;
 719                 if (i > count)
 720                         i = count;
 721                 memcpy_tofs(destptr, line+column, i);
 722                 destptr += i; count -= i;
 723                 column += i;
 724                 if (column >= len) {
 725                         column = 0; /* next time: next line at column 0 */
 726                         lineno++;
 727                         map = map->vm_next;
 728                 }
 729 
 730                 /* done? */
 731                 if (count == 0)
 732                         break;
 733 
 734                 /* By writing to user space, we might have slept.
 735                  * Stop the loop, to avoid a race condition.
 736                  */
 737                 if (*p != current)
 738                         break;
 739         }
 740 
 741         /* encode f_pos */
 742         file->f_pos = (lineno << MAPS_LINE_SHIFT) + column;
 743 
 744         return destptr-buf;
 745 }
 746 
 747 extern int get_module_list(char *);
 748 extern int get_device_list(char *);
 749 extern int get_filesystem_list(char *);
 750 extern int get_ksyms_list(char *);
 751 extern int get_irq_list(char *);
 752 extern int get_dma_list(char *);
 753 extern int get_cpuinfo(char *);
 754 extern int get_pci_list(char*);
 755 
 756 static int get_root_array(char * page, int type)
     /* [previous][next][first][last][top][bottom][index][help] */
 757 {
 758         switch (type) {
 759                 case PROC_LOADAVG:
 760                         return get_loadavg(page);
 761 
 762                 case PROC_UPTIME:
 763                         return get_uptime(page);
 764 
 765                 case PROC_MEMINFO:
 766                         return get_meminfo(page);
 767 
 768 #ifdef CONFIG_PCI
 769                 case PROC_PCI:
 770                         return get_pci_list(page);
 771 #endif
 772                         
 773                 case PROC_CPUINFO:
 774                         return get_cpuinfo(page);
 775 
 776                 case PROC_VERSION:
 777                         return get_version(page);
 778 
 779 #ifdef CONFIG_DEBUG_MALLOC
 780                 case PROC_MALLOC:
 781                         return get_malloc(page);
 782 #endif
 783 
 784                 case PROC_MODULES:
 785                         return get_module_list(page);
 786 
 787                 case PROC_STAT:
 788                         return get_kstat(page);
 789 
 790                 case PROC_DEVICES:
 791                         return get_device_list(page);
 792 
 793                 case PROC_INTERRUPTS:
 794                         return get_irq_list(page);
 795 
 796                 case PROC_FILESYSTEMS:
 797                         return get_filesystem_list(page);
 798 
 799                 case PROC_KSYMS:
 800                         return get_ksyms_list(page);
 801 
 802                 case PROC_DMA:
 803                         return get_dma_list(page);
 804 
 805                 case PROC_IOPORTS:
 806                         return get_ioport_list(page);
 807         }
 808         return -EBADF;
 809 }
 810 
 811 static int get_process_array(char * page, int pid, int type)
     /* [previous][next][first][last][top][bottom][index][help] */
 812 {
 813         switch (type) {
 814                 case PROC_PID_ENVIRON:
 815                         return get_env(pid, page);
 816                 case PROC_PID_CMDLINE:
 817                         return get_arg(pid, page);
 818                 case PROC_PID_STAT:
 819                         return get_stat(pid, page);
 820                 case PROC_PID_STATM:
 821                         return get_statm(pid, page);
 822         }
 823         return -EBADF;
 824 }
 825 
 826 
 827 static inline int fill_array(char * page, int pid, int type)
     /* [previous][next][first][last][top][bottom][index][help] */
 828 {
 829         if (pid)
 830                 return get_process_array(page, pid, type);
 831         return get_root_array(page, type);
 832 }
 833 
 834 static int array_read(struct inode * inode, struct file * file,char * buf, int count)
     /* [previous][next][first][last][top][bottom][index][help] */
 835 {
 836         unsigned long page;
 837         int length;
 838         int end;
 839         unsigned int type, pid;
 840 
 841         if (count < 0)
 842                 return -EINVAL;
 843         if (!(page = __get_free_page(GFP_KERNEL)))
 844                 return -ENOMEM;
 845         type = inode->i_ino;
 846         pid = type >> 16;
 847         type &= 0x0000ffff;
 848         length = fill_array((char *) page, pid, type);
 849         if (length < 0) {
 850                 free_page(page);
 851                 return length;
 852         }
 853         if (file->f_pos >= length) {
 854                 free_page(page);
 855                 return 0;
 856         }
 857         if (count + file->f_pos > length)
 858                 count = length - file->f_pos;
 859         end = count + file->f_pos;
 860         memcpy_tofs(buf, (char *) page + file->f_pos, count);
 861         free_page(page);
 862         file->f_pos = end;
 863         return count;
 864 }
 865 
 866 static struct file_operations proc_array_operations = {
 867         NULL,           /* array_lseek */
 868         array_read,
 869         NULL,           /* array_write */
 870         NULL,           /* array_readdir */
 871         NULL,           /* array_select */
 872         NULL,           /* array_ioctl */
 873         NULL,           /* mmap */
 874         NULL,           /* no special open code */
 875         NULL,           /* no special release code */
 876         NULL            /* can't fsync */
 877 };
 878 
 879 struct inode_operations proc_array_inode_operations = {
 880         &proc_array_operations, /* default base directory file-ops */
 881         NULL,                   /* create */
 882         NULL,                   /* lookup */
 883         NULL,                   /* link */
 884         NULL,                   /* unlink */
 885         NULL,                   /* symlink */
 886         NULL,                   /* mkdir */
 887         NULL,                   /* rmdir */
 888         NULL,                   /* mknod */
 889         NULL,                   /* rename */
 890         NULL,                   /* readlink */
 891         NULL,                   /* follow_link */
 892         NULL,                   /* bmap */
 893         NULL,                   /* truncate */
 894         NULL                    /* permission */
 895 };
 896 
 897 static int arraylong_read (struct inode * inode, struct file * file, char * buf, int count)
     /* [previous][next][first][last][top][bottom][index][help] */
 898 {
 899         unsigned int pid = inode->i_ino >> 16;
 900         unsigned int type = inode->i_ino & 0x0000ffff;
 901 
 902         if (count < 0)
 903                 return -EINVAL;
 904 
 905         switch (type) {
 906                 case PROC_PID_MAPS:
 907                         return read_maps(pid, file, buf, count);
 908         }
 909         return -EINVAL;
 910 }
 911 
 912 static struct file_operations proc_arraylong_operations = {
 913         NULL,           /* array_lseek */
 914         arraylong_read,
 915         NULL,           /* array_write */
 916         NULL,           /* array_readdir */
 917         NULL,           /* array_select */
 918         NULL,           /* array_ioctl */
 919         NULL,           /* mmap */
 920         NULL,           /* no special open code */
 921         NULL,           /* no special release code */
 922         NULL            /* can't fsync */
 923 };
 924 
 925 struct inode_operations proc_arraylong_inode_operations = {
 926         &proc_arraylong_operations,     /* default base directory file-ops */
 927         NULL,                   /* create */
 928         NULL,                   /* lookup */
 929         NULL,                   /* link */
 930         NULL,                   /* unlink */
 931         NULL,                   /* symlink */
 932         NULL,                   /* mkdir */
 933         NULL,                   /* rmdir */
 934         NULL,                   /* mknod */
 935         NULL,                   /* rename */
 936         NULL,                   /* readlink */
 937         NULL,                   /* follow_link */
 938         NULL,                   /* bmap */
 939         NULL,                   /* truncate */
 940         NULL                    /* permission */
 941 };

/* [previous][next][first][last][top][bottom][index][help] */