root/fs/proc/array.c

/* */

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. get_statm
18. get_maps
19. get_root_array
20. get_process_array
21. fill_array
22. 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  * 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 
  27 #include <linux/types.h>
  28 #include <linux/errno.h>
  29 #include <linux/sched.h>
  30 #include <linux/kernel.h>
  31 #include <linux/kernel_stat.h>
  32 #include <linux/tty.h>
  33 #include <linux/user.h>
  34 #include <linux/a.out.h>
  35 #include <linux/string.h>
  36 #include <linux/mman.h>
  37 #include <linux/proc_fs.h>
  38 #include <linux/ioport.h>
  39 #include <linux/config.h>
  40 #include <linux/delay.h>
  41 
  42 #include <asm/segment.h>
  43 #include <asm/io.h>
  44 
  45 #define LOAD_INT(x) ((x) >> FSHIFT)
  46 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  47 
  48 #ifdef CONFIG_DEBUG_MALLOC
  49 int get_malloc(char * buffer);
  50 #endif
  51 
  52 static int read_core(struct inode * inode, struct file * file,char * buf, int count)
     /*  */
  53 {
  54         unsigned long p = file->f_pos;
  55         int read;
  56         int count1;
  57         char * pnt;
  58         struct user dump;
  59 
  60         memset(&dump, 0, sizeof(struct user));
  61         dump.magic = CMAGIC;
  62         dump.u_dsize = high_memory >> 12;
  63 
  64         if (count < 0)
  65                 return -EINVAL;
  66         if (p >= high_memory + PAGE_SIZE)
  67                 return 0;
  68         if (count > high_memory + PAGE_SIZE - p)
  69                 count = high_memory + PAGE_SIZE - p;
  70         read = 0;
  71 
  72         if (p < sizeof(struct user) && count > 0) {
  73                 count1 = count;
  74                 if (p + count1 > sizeof(struct user))
  75                         count1 = sizeof(struct user)-p;
  76                 pnt = (char *) &dump + p;
  77                 memcpy_tofs(buf,(void *) pnt, count1);
  78                 buf += count1;
  79                 p += count1;
  80                 count -= count1;
  81                 read += count1;
  82         }
  83 
  84         while (p < 2*PAGE_SIZE && count > 0) {
  85                 put_fs_byte(0,buf);
  86                 buf++;
  87                 p++;
  88                 count--;
  89                 read++;
  90         }
  91         memcpy_tofs(buf,(void *) (p - PAGE_SIZE),count);
  92         read += count;
  93         file->f_pos += read;
  94         return read;
  95 }
  96 
  97 static struct file_operations proc_kcore_operations = {
  98         NULL,           /* lseek */
  99         read_core,
 100 };
 101 
 102 struct inode_operations proc_kcore_inode_operations = {
 103         &proc_kcore_operations, 
 104 };
 105 
 106 #ifdef CONFIG_PROFILE
 107 
 108 extern unsigned long prof_len;
 109 extern unsigned long * prof_buffer;
 110 /*
 111  * This function accesses profiling information. The returned data is
 112  * binary: the sampling step and the actual contents of the profile
 113  * buffer. Use of the program readprofile is recommended in order to
 114  * get meaningful info out of these data.
 115  */
 116 static int read_profile(struct inode *inode, struct file *file, char *buf, int count)
     /*  */
 117 {
 118     unsigned long p = file->f_pos;
 119         int read;
 120         char * pnt;
 121         unsigned long sample_step = 1 << CONFIG_PROFILE_SHIFT;
 122 
 123         if (count < 0)
 124             return -EINVAL;
 125         if (p >= (prof_len+1)*sizeof(unsigned long))
 126             return 0;
 127         if (count > (prof_len+1)*sizeof(unsigned long) - p)
 128             count = (prof_len+1)*sizeof(unsigned long) - p;
 129     read = 0;
 130 
 131     while (p < sizeof(unsigned long) && count > 0) {
 132         put_fs_byte(*((char *)(&sample_step)+p),buf);
 133                 buf++; p++; count--; read++;
 134     }
 135     pnt = (char *)prof_buffer + p - sizeof(unsigned long);
 136         memcpy_tofs(buf,(void *)pnt,count);
 137         read += count;
 138         file->f_pos += read;
 139         return read;
 140 }
 141 
 142 /* Writing to /proc/profile resets the counters */
 143 static int write_profile(struct inode * inode, struct file * file, char * buf, int count)
     /*  */
 144 {
 145     int i=prof_len;
 146 
 147     while (i--)
 148             prof_buffer[i]=0UL;
 149     return count;
 150 }
 151 
 152 static struct file_operations proc_profile_operations = {
 153         NULL,           /* lseek */
 154         read_profile,
 155         write_profile,
 156 };
 157 
 158 struct inode_operations proc_profile_inode_operations = {
 159         &proc_profile_operations, 
 160 };
 161 
 162 #endif /* CONFIG_PROFILE */
 163 
 164 static int get_loadavg(char * buffer)
     /*  */
 165 {
 166         int a, b, c;
 167 
 168         a = avenrun[0] + (FIXED_1/200);
 169         b = avenrun[1] + (FIXED_1/200);
 170         c = avenrun[2] + (FIXED_1/200);
 171         return sprintf(buffer,"%d.%02d %d.%02d %d.%02d\n",
 172                 LOAD_INT(a), LOAD_FRAC(a),
 173                 LOAD_INT(b), LOAD_FRAC(b),
 174                 LOAD_INT(c), LOAD_FRAC(c));
 175 }
 176 
 177 static int get_kstat(char * buffer)
     /*  */
 178 {
 179         int i, len;
 180         unsigned sum = 0;
 181 
 182         for (i = 0 ; i < 16 ; i++)
 183                 sum += kstat.interrupts[i];
 184         len = sprintf(buffer,
 185                 "cpu  %u %u %u %lu\n"
 186                 "disk %u %u %u %u\n"
 187                 "page %u %u\n"
 188                 "swap %u %u\n"
 189                 "intr %u",
 190                 kstat.cpu_user,
 191                 kstat.cpu_nice,
 192                 kstat.cpu_system,
 193                 jiffies - (kstat.cpu_user + kstat.cpu_nice + kstat.cpu_system),
 194                 kstat.dk_drive[0],
 195                 kstat.dk_drive[1],
 196                 kstat.dk_drive[2],
 197                 kstat.dk_drive[3],
 198                 kstat.pgpgin,
 199                 kstat.pgpgout,
 200                 kstat.pswpin,
 201                 kstat.pswpout,
 202                 sum);
 203         for (i = 0 ; i < 16 ; i++)
 204                 len += sprintf(buffer + len, " %u", kstat.interrupts[i]);
 205         len += sprintf(buffer + len,
 206                 "\nctxt %u\n"
 207                 "btime %lu\n",
 208                 kstat.context_swtch,
 209                 xtime.tv_sec - jiffies / HZ);
 210         return len;
 211 }
 212 
 213 
 214 static int get_uptime(char * buffer)
     /*  */
 215 {
 216         unsigned long uptime;
 217         unsigned long idle;
 218 
 219         uptime = jiffies;
 220         idle = task[0]->utime + task[0]->stime;
 221 
 222         /* The formula for the fraction parts really is ((t * 100) / HZ) % 100, but
 223            that would overflow about every five days at HZ == 100.
 224            Therefore the identity a = (a / b) * b + a % b is used so that it is
 225            calculated as (((t / HZ) * 100) + ((t % HZ) * 100) / HZ) % 100.
 226            The part in front of the '+' always evaluates as 0 (mod 100). All divisions
 227            in the above formulas are truncating. For HZ being a power of 10, the
 228            calculations simplify to the version in the #else part (if the printf
 229            format is adapted to the same number of digits as zeroes in HZ.
 230          */
 231 #if HZ!=100
 232         return sprintf(buffer,"%lu.%02lu %lu.%02lu\n",
 233                 uptime / HZ,
 234                 (((uptime % HZ) * 100) / HZ) % 100,
 235                 idle / HZ,
 236                 (((idle % HZ) * 100) / HZ) % 100);
 237 #else
 238         return sprintf(buffer,"%lu.%02lu %lu.%02lu\n",
 239                 uptime / HZ,
 240                 uptime % HZ,
 241                 idle / HZ,
 242                 idle % HZ);
 243 #endif
 244 }
 245 
 246 static int get_meminfo(char * buffer)
     /*  */
 247 {
 248         struct sysinfo i;
 249 
 250         si_meminfo(&i);
 251         si_swapinfo(&i);
 252         return sprintf(buffer, "        total:   used:    free:   shared:  buffers:\n"
 253                 "Mem:  %8lu %8lu %8lu %8lu %8lu\n"
 254                 "Swap: %8lu %8lu %8lu\n",
 255                 i.totalram, i.totalram-i.freeram, i.freeram, i.sharedram, i.bufferram,
 256                 i.totalswap, i.totalswap-i.freeswap, i.freeswap);
 257 }
 258 
 259 static int get_version(char * buffer)
     /*  */
 260 {
 261         extern char *linux_banner;
 262 
 263         strcpy(buffer, linux_banner);
 264         return strlen(buffer);
 265 }
 266 
 267 static int get_cpuinfo(char * buffer)
     /*  */
 268 {
 269 #ifdef __i386__
 270         char *model[2][9]={{"DX","SX","DX/2","4","SX/2","6",
 271                                 "7","DX/4"},
 272                         {"Pentium 60/66","Pentium 90/100","3",
 273                                 "4","5","6","7","8"}};
 274         char mask[2];
 275         mask[0] = x86_mask+'@';
 276         mask[1] = '\0';
 277         return sprintf(buffer,"cpu\t\t: %c86\n"
 278                               "model\t\t: %s\n"
 279                               "mask\t\t: %s\n"
 280                               "vid\t\t: %s\n"
 281                               "fdiv_bug\t: %s\n"
 282                               "math\t\t: %s\n"
 283                               "hlt\t\t: %s\n"
 284                               "wp\t\t: %s\n"
 285                               "Integrated NPU\t: %s\n"
 286                               "Enhanced VM86\t: %s\n"
 287                               "IO Breakpoints\t: %s\n"
 288                               "4MB Pages\t: %s\n"
 289                               "TS Counters\t: %s\n"
 290                               "Pentium MSR\t: %s\n"
 291                               "Mach. Ch. Exep.\t: %s\n"
 292                               "CMPXCHGB8B\t: %s\n"
 293                               "BogoMips\t: %lu.%02lu\n",
 294                               x86+'0', 
 295                               x86_model ? model[x86-4][x86_model-1] : "Unknown",
 296                               x86_mask ? mask : "Unknown",
 297                               x86_vendor_id,
 298                               fdiv_bug ? "yes" : "no",
 299                               hard_math ? "yes" : "no",
 300                               hlt_works_ok ? "yes" : "no",
 301                               wp_works_ok ? "yes" : "no",
 302                               x86_capability & 1 ? "yes" : "no",
 303                               x86_capability & 2 ? "yes" : "no",
 304                               x86_capability & 4 ? "yes" : "no",
 305                               x86_capability & 8 ? "yes" : "no",
 306                               x86_capability & 16 ? "yes" : "no",
 307                               x86_capability & 32 ? "yes" : "no",
 308                               x86_capability & 128 ? "yes" : "no",
 309                               x86_capability & 256 ? "yes" : "no",
 310                               loops_per_sec/500000, (loops_per_sec/5000) % 100
 311                               );
 312 #else
 313         return 0;
 314 #endif
 315 }
 316 
 317 static struct task_struct ** get_task(pid_t pid)
     /*  */
 318 {
 319         struct task_struct ** p;
 320 
 321         p = task;
 322         while (++p < task+NR_TASKS) {
 323                 if (*p && (*p)->pid == pid)
 324                         return p;
 325         }
 326         return NULL;
 327 }
 328 
 329 static unsigned long get_phys_addr(struct task_struct ** p, unsigned long ptr)
     /*  */
 330 {
 331         unsigned long page;
 332 
 333         if (!p || !*p || ptr >= TASK_SIZE)
 334                 return 0;
 335         page = *PAGE_DIR_OFFSET(*p,ptr);
 336         if (!(page & PAGE_PRESENT))
 337                 return 0;
 338         page &= PAGE_MASK;
 339         page += PAGE_PTR(ptr);
 340         page = *(unsigned long *) page;
 341         if (!(page & PAGE_PRESENT))
 342                 return 0;
 343         page &= PAGE_MASK;
 344         page += ptr & ~PAGE_MASK;
 345         return page;
 346 }
 347 
 348 static int get_array(struct task_struct ** p, unsigned long start, unsigned long end, char * buffer)
     /*  */
 349 {
 350         unsigned long addr;
 351         int size = 0, result = 0;
 352         char c;
 353 
 354         if (start >= end)
 355                 return result;
 356         for (;;) {
 357                 addr = get_phys_addr(p, start);
 358                 if (!addr)
 359                         goto ready;
 360                 do {
 361                         c = *(char *) addr;
 362                         if (!c)
 363                                 result = size;
 364                         if (size < PAGE_SIZE)
 365                                 buffer[size++] = c;
 366                         else
 367                                 goto ready;
 368                         addr++;
 369                         start++;
 370                         if (!c && start >= end)
 371                                 goto ready;
 372                 } while (addr & ~PAGE_MASK);
 373         }
 374 ready:
 375         /* remove the trailing blanks, used to fill out argv,envp space */
 376         while (result>0 && buffer[result-1]==' ')
 377                 result--;
 378         return result;
 379 }
 380 
 381 static int get_env(int pid, char * buffer)
     /*  */
 382 {
 383         struct task_struct ** p = get_task(pid);
 384 
 385         if (!p || !*p)
 386                 return 0;
 387         return get_array(p, (*p)->mm->env_start, (*p)->mm->env_end, buffer);
 388 }
 389 
 390 static int get_arg(int pid, char * buffer)
     /*  */
 391 {
 392         struct task_struct ** p = get_task(pid);
 393 
 394         if (!p || !*p)
 395                 return 0;
 396         return get_array(p, (*p)->mm->arg_start, (*p)->mm->arg_end, buffer);
 397 }
 398 
 399 static unsigned long get_wchan(struct task_struct *p)
     /*  */
 400 {
 401 #ifdef __i386__
 402         unsigned long ebp, eip;
 403         unsigned long stack_page;
 404         int count = 0;
 405 
 406         if (!p || p == current || p->state == TASK_RUNNING)
 407                 return 0;
 408         stack_page = p->kernel_stack_page;
 409         if (!stack_page)
 410                 return 0;
 411         ebp = p->tss.ebp;
 412         do {
 413                 if (ebp < stack_page || ebp >= 4092+stack_page)
 414                         return 0;
 415                 eip = *(unsigned long *) (ebp+4);
 416                 if ((void *)eip != sleep_on &&
 417                     (void *)eip != interruptible_sleep_on)
 418                         return eip;
 419                 ebp = *(unsigned long *) ebp;
 420         } while (count++ < 16);
 421 #endif
 422         return 0;
 423 }
 424 
 425 #define KSTK_EIP(stack) (((unsigned long *)stack)[1019])
 426 #define KSTK_ESP(stack) (((unsigned long *)stack)[1022])
 427 
 428 static int get_stat(int pid, char * buffer)
     /*  */
 429 {
 430         struct task_struct ** p = get_task(pid);
 431         unsigned long sigignore=0, sigcatch=0, bit=1, wchan;
 432         unsigned long vsize, eip, esp;
 433         int i,tty_pgrp;
 434         char state;
 435 
 436         if (!p || !*p)
 437                 return 0;
 438         if ((*p)->state < 0 || (*p)->state > 5)
 439                 state = '.';
 440         else
 441                 state = "RSDZTD"[(*p)->state];
 442         eip = esp = 0;
 443         vsize = (*p)->kernel_stack_page;
 444         if (vsize) {
 445                 eip = KSTK_EIP(vsize);
 446                 esp = KSTK_ESP(vsize);
 447                 vsize = (*p)->mm->brk - (*p)->mm->start_code + PAGE_SIZE-1;
 448                 if (esp)
 449                         vsize += TASK_SIZE - esp;
 450         }
 451         wchan = get_wchan(*p);
 452         for(i=0; i<32; ++i) {
 453                 switch((unsigned long) (*p)->sigaction[i].sa_handler) {
 454                 case 1: sigignore |= bit; break;
 455                 case 0: break;
 456                 default: sigcatch |= bit;
 457                 } bit <<= 1;
 458         }
 459         if ((*p)->tty)
 460                 tty_pgrp = (*p)->tty->pgrp;
 461         else
 462                 tty_pgrp = -1;
 463         return sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
 464 %lu %lu %lu %ld %ld %ld %ld %ld %ld %lu %lu %ld %lu %lu %lu %lu %lu %lu %lu %lu %lu \
 465 %lu %lu %lu %lu\n",
 466                 pid,
 467                 (*p)->comm,
 468                 state,
 469                 (*p)->p_pptr->pid,
 470                 (*p)->pgrp,
 471                 (*p)->session,
 472                 (*p)->tty ? (*p)->tty->device : 0,
 473                 tty_pgrp,
 474                 (*p)->flags,
 475                 (*p)->mm->min_flt,
 476                 (*p)->mm->cmin_flt,
 477                 (*p)->mm->maj_flt,
 478                 (*p)->mm->cmaj_flt,
 479                 (*p)->utime,
 480                 (*p)->stime,
 481                 (*p)->cutime,
 482                 (*p)->cstime,
 483                 (*p)->counter,  /* this is the kernel priority ---
 484                                    subtract 30 in your user-level program. */
 485                 (*p)->priority, /* this is the nice value ---
 486                                    subtract 15 in your user-level program. */
 487                 (*p)->timeout,
 488                 (*p)->it_real_value,
 489                 (*p)->start_time,
 490                 vsize,
 491                 (*p)->mm->rss, /* you might want to shift this left 3 */
 492                 (*p)->rlim[RLIMIT_RSS].rlim_cur,
 493                 (*p)->mm->start_code,
 494                 (*p)->mm->end_code,
 495                 (*p)->mm->start_stack,
 496                 esp,
 497                 eip,
 498                 (*p)->signal,
 499                 (*p)->blocked,
 500                 sigignore,
 501                 sigcatch,
 502                 wchan);
 503 }
 504 
 505 static int get_statm(int pid, char * buffer)
     /*  */
 506 {
 507         struct task_struct ** p = get_task(pid);
 508         int i, tpag;
 509         int size=0, resident=0, share=0, trs=0, lrs=0, drs=0, dt=0;
 510         unsigned long ptbl, *buf, *pte, *pagedir, map_nr;
 511 
 512         if (!p || !*p)
 513                 return 0;
 514         tpag = (*p)->mm->end_code / PAGE_SIZE;
 515         if ((*p)->state != TASK_ZOMBIE) {
 516           pagedir = PAGE_DIR_OFFSET(*p, 0);
 517           for (i = 0; i < 0x300; ++i) {
 518             if ((ptbl = pagedir[i]) == 0) {
 519               tpag -= PTRS_PER_PAGE;
 520               continue;
 521             }
 522             buf = (unsigned long *)(ptbl & PAGE_MASK);
 523             for (pte = buf; pte < (buf + PTRS_PER_PAGE); ++pte) {
 524               if (*pte != 0) {
 525                 ++size;
 526                 if (*pte & 1) {
 527                   ++resident;
 528                   if (tpag > 0)
 529                     ++trs;
 530                   else
 531                     ++drs;
 532                   if (i >= 15 && i < 0x2f0) {
 533                     ++lrs;
 534                     if (*pte & 0x40)
 535                       ++dt;
 536                     else
 537                       --drs;
 538                   }
 539                   map_nr = MAP_NR(*pte);
 540                   if (map_nr < (high_memory / PAGE_SIZE) && mem_map[map_nr] > 1)
 541                     ++share;
 542                 }
 543               }
 544               --tpag;
 545             }
 546           }
 547         }
 548         return sprintf(buffer,"%d %d %d %d %d %d %d\n",
 549                        size, resident, share, trs, lrs, drs, dt);
 550 }
 551 
 552 static int get_maps(int pid, char *buf)
     /*  */
 553 {
 554         int sz = 0;
 555         struct task_struct **p = get_task(pid);
 556         struct vm_area_struct *map;
 557 
 558         if (!p || !*p)
 559                 return 0;
 560 
 561         for(map = (*p)->mm->mmap; map != NULL; map = map->vm_next) {
 562                 char str[7], *cp = str;
 563                 int flags;
 564                 int end = sz + 80;      /* Length of line */
 565                 dev_t dev;
 566                 unsigned long ino;
 567 
 568                 flags = map->vm_flags;
 569 
 570                 *cp++ = flags & VM_READ ? 'r' : '-';
 571                 *cp++ = flags & VM_WRITE ? 'w' : '-';
 572                 *cp++ = flags & VM_EXEC ? 'x' : '-';
 573                 *cp++ = flags & VM_SHARED ? 's' : 'p';
 574                 *cp++ = 0;
 575                 
 576                 if (end >= PAGE_SIZE) {
 577                         sprintf(buf+sz, "...\n");
 578                         break;
 579                 }
 580                 
 581                 if (map->vm_inode != NULL) {
 582                         dev = map->vm_inode->i_dev;
 583                         ino = map->vm_inode->i_ino;
 584                 } else {
 585                         dev = 0;
 586                         ino = 0;
 587                 }
 588 
 589                 sz += sprintf(buf+sz, "%08lx-%08lx %s %08lx %02x:%02x %lu\n",
 590                               map->vm_start, map->vm_end, str, map->vm_offset,
 591                               MAJOR(dev),MINOR(dev), ino);
 592                 if (sz > end) {
 593                         printk("get_maps: end(%d) < sz(%d)\n", end, sz);
 594                         break;
 595                 }
 596         }
 597         
 598         return sz;
 599 }
 600 
 601 extern int get_module_list(char *);
 602 extern int get_device_list(char *);
 603 extern int get_filesystem_list(char *);
 604 extern int get_ksyms_list(char *);
 605 extern int get_irq_list(char *);
 606 extern int get_dma_list(char *);
 607 extern int get_cpuinfo(char *);
 608 extern int get_pci_list(char*);
 609 
 610 static int get_root_array(char * page, int type)
     /*  */
 611 {
 612         switch (type) {
 613                 case PROC_LOADAVG:
 614                         return get_loadavg(page);
 615 
 616                 case PROC_UPTIME:
 617                         return get_uptime(page);
 618 
 619                 case PROC_MEMINFO:
 620                         return get_meminfo(page);
 621 
 622 #ifdef CONFIG_PCI
 623                 case PROC_PCI:
 624                         return get_pci_list(page);
 625 #endif
 626                         
 627                 case PROC_CPUINFO:
 628                         return get_cpuinfo(page);
 629 
 630                 case PROC_VERSION:
 631                         return get_version(page);
 632 
 633 #ifdef CONFIG_DEBUG_MALLOC
 634                 case PROC_MALLOC:
 635                         return get_malloc(page);
 636 #endif
 637 
 638                 case PROC_MODULES:
 639                         return get_module_list(page);
 640 
 641                 case PROC_STAT:
 642                         return get_kstat(page);
 643 
 644                 case PROC_DEVICES:
 645                         return get_device_list(page);
 646 
 647                 case PROC_INTERRUPTS:
 648                         return get_irq_list(page);
 649 
 650                 case PROC_FILESYSTEMS:
 651                         return get_filesystem_list(page);
 652 
 653                 case PROC_KSYMS:
 654                         return get_ksyms_list(page);
 655 
 656                 case PROC_DMA:
 657                         return get_dma_list(page);
 658 
 659                 case PROC_IOPORTS:
 660                         return get_ioport_list(page);
 661         }
 662         return -EBADF;
 663 }
 664 
 665 static int get_process_array(char * page, int pid, int type)
     /*  */
 666 {
 667         switch (type) {
 668                 case PROC_PID_ENVIRON:
 669                         return get_env(pid, page);
 670                 case PROC_PID_CMDLINE:
 671                         return get_arg(pid, page);
 672                 case PROC_PID_STAT:
 673                         return get_stat(pid, page);
 674                 case PROC_PID_STATM:
 675                         return get_statm(pid, page);
 676                 case PROC_PID_MAPS:
 677                         return get_maps(pid, page);
 678         }
 679         return -EBADF;
 680 }
 681 
 682 
 683 static inline int fill_array(char * page, int pid, int type)
     /*  */
 684 {
 685         if (pid)
 686                 return get_process_array(page, pid, type);
 687         return get_root_array(page, type);
 688 }
 689 
 690 static int array_read(struct inode * inode, struct file * file,char * buf, int count)
     /*  */
 691 {
 692         unsigned long page;
 693         int length;
 694         int end;
 695         unsigned int type, pid;
 696 
 697         if (count < 0)
 698                 return -EINVAL;
 699         if (!(page = __get_free_page(GFP_KERNEL)))
 700                 return -ENOMEM;
 701         type = inode->i_ino;
 702         pid = type >> 16;
 703         type &= 0x0000ffff;
 704         length = fill_array((char *) page, pid, type);
 705         if (length < 0) {
 706                 free_page(page);
 707                 return length;
 708         }
 709         if (file->f_pos >= length) {
 710                 free_page(page);
 711                 return 0;
 712         }
 713         if (count + file->f_pos > length)
 714                 count = length - file->f_pos;
 715         end = count + file->f_pos;
 716         memcpy_tofs(buf, (char *) page + file->f_pos, count);
 717         free_page(page);
 718         file->f_pos = end;
 719         return count;
 720 }
 721 
 722 static struct file_operations proc_array_operations = {
 723         NULL,           /* array_lseek */
 724         array_read,
 725         NULL,           /* array_write */
 726         NULL,           /* array_readdir */
 727         NULL,           /* array_select */
 728         NULL,           /* array_ioctl */
 729         NULL,           /* mmap */
 730         NULL,           /* no special open code */
 731         NULL,           /* no special release code */
 732         NULL            /* can't fsync */
 733 };
 734 
 735 struct inode_operations proc_array_inode_operations = {
 736         &proc_array_operations, /* default base directory file-ops */
 737         NULL,                   /* create */
 738         NULL,                   /* lookup */
 739         NULL,                   /* link */
 740         NULL,                   /* unlink */
 741         NULL,                   /* symlink */
 742         NULL,                   /* mkdir */
 743         NULL,                   /* rmdir */
 744         NULL,                   /* mknod */
 745         NULL,                   /* rename */
 746         NULL,                   /* readlink */
 747         NULL,                   /* follow_link */
 748         NULL,                   /* bmap */
 749         NULL,                   /* truncate */
 750         NULL                    /* permission */
 751 };

/* */