fs/proc/array.c

/* */
This source file includes following definitions.
read_core
get_loadavg
get_kstat
get_uptime
get_meminfo
get_version
get_task
get_phys_addr
get_array
get_env
get_arg
get_wchan
get_stat
get_statm
get_maps
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 addres recalculation for
  14  *                      EVERY character on the current page.
  15  *                      <middelin@calvin.iaf.nl>
  16  */
  17 
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/sched.h>
  21 #include <linux/kernel.h>
  22 #include <linux/kernel_stat.h>
  23 #include <linux/tty.h>
  24 #include <linux/user.h>
  25 #include <linux/a.out.h>
  26 #include <linux/string.h>
  27 #include <linux/mman.h>
  28 
  29 #include <asm/segment.h>
  30 #include <asm/io.h>
  31 
  32 #define LOAD_INT(x) ((x) >> FSHIFT)
  33 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  34 
  35 #ifdef CONFIG_DEBUG_MALLOC
  36 int get_malloc(char * buffer);
  37 #endif
  38 
  39 static int read_core(struct inode * inode, struct file * file,char * buf, int count)
     /*  */
  40 {
  41         unsigned long p = file->f_pos;
  42         int read;
  43         int count1;
  44         char * pnt;
  45         struct user dump;
  46 
  47         memset(&dump, 0, sizeof(struct user));
  48         dump.magic = CMAGIC;
  49         dump.u_dsize = high_memory >> 12;
  50 
  51         if (count < 0)
  52                 return -EINVAL;
  53         if (p >= high_memory + PAGE_SIZE)
  54                 return 0;
  55         if (count > high_memory + PAGE_SIZE - p)
  56                 count = high_memory + PAGE_SIZE - p;
  57         read = 0;
  58 
  59         if (p < sizeof(struct user) && count > 0) {
  60                 count1 = count;
  61                 if (p + count1 > sizeof(struct user))
  62                         count1 = sizeof(struct user)-p;
  63                 pnt = (char *) &dump + p;
  64                 memcpy_tofs(buf,(void *) pnt, count1);
  65                 buf += count1;
  66                 p += count1;
  67                 count -= count1;
  68                 read += count1;
  69         }
  70 
  71         while (p < 2*PAGE_SIZE && count > 0) {
  72                 put_fs_byte(0,buf);
  73                 buf++;
  74                 p++;
  75                 count--;
  76                 read++;
  77         }
  78         memcpy_tofs(buf,(void *) (p - PAGE_SIZE),count);
  79         read += count;
  80         file->f_pos += read;
  81         return read;
  82 }
  83 
  84 static int get_loadavg(char * buffer)
     /*  */
  85 {
  86         int a, b, c;
  87 
  88         a = avenrun[0] + (FIXED_1/200);
  89         b = avenrun[1] + (FIXED_1/200);
  90         c = avenrun[2] + (FIXED_1/200);
  91         return sprintf(buffer,"%d.%02d %d.%02d %d.%02d\n",
  92                 LOAD_INT(a), LOAD_FRAC(a),
  93                 LOAD_INT(b), LOAD_FRAC(b),
  94                 LOAD_INT(c), LOAD_FRAC(c));
  95 }
  96 
  97 static int get_kstat(char * buffer)
     /*  */
  98 {
  99         int i, len;
 100         unsigned sum = 0;
 101 
 102         for (i = 0 ; i < 16 ; i++)
 103                 sum += kstat.interrupts[i];
 104         len = sprintf(buffer,
 105                 "cpu  %u %u %u %lu\n"
 106                 "disk %u %u %u %u\n"
 107                 "page %u %u\n"
 108                 "swap %u %u\n"
 109                 "intr %u",
 110                 kstat.cpu_user,
 111                 kstat.cpu_nice,
 112                 kstat.cpu_system,
 113                 jiffies - (kstat.cpu_user + kstat.cpu_nice + kstat.cpu_system),
 114                 kstat.dk_drive[0],
 115                 kstat.dk_drive[1],
 116                 kstat.dk_drive[2],
 117                 kstat.dk_drive[3],
 118                 kstat.pgpgin,
 119                 kstat.pgpgout,
 120                 kstat.pswpin,
 121                 kstat.pswpout,
 122                 sum);
 123         for (i = 0 ; i < 16 ; i++)
 124                 len += sprintf(buffer + len, " %u", kstat.interrupts[i]);
 125         len += sprintf(buffer + len,
 126                 "\nctxt %u\n"
 127                 "btime %lu\n",
 128                 kstat.context_swtch,
 129                 xtime.tv_sec - jiffies / HZ);
 130         return len;
 131 }
 132 
 133 
 134 static int get_uptime(char * buffer)
     /*  */
 135 {
 136         unsigned long uptime;
 137         unsigned long idle;
 138 
 139         uptime = jiffies;
 140         idle = task[0]->utime + task[0]->stime;
 141         return sprintf(buffer,"%lu.%02lu %lu.%02lu\n",
 142                 uptime / HZ,
 143                 uptime % HZ,
 144                 idle / HZ,
 145                 idle % HZ);
 146 }
 147 
 148 static int get_meminfo(char * buffer)
     /*  */
 149 {
 150         struct sysinfo i;
 151 
 152         si_meminfo(&i);
 153         si_swapinfo(&i);
 154         return sprintf(buffer, "        total:   used:    free:   shared:  buffers:\n"
 155                 "Mem:  %8lu %8lu %8lu %8lu %8lu\n"
 156                 "Swap: %8lu %8lu %8lu\n",
 157                 i.totalram, i.totalram-i.freeram, i.freeram, i.sharedram, i.bufferram,
 158                 i.totalswap, i.totalswap-i.freeswap, i.freeswap);
 159 }
 160 
 161 static int get_version(char * buffer)
     /*  */
 162 {
 163         extern char *linux_banner;
 164 
 165         strcpy(buffer, linux_banner);
 166         return strlen(buffer);
 167 }
 168 
 169 static struct task_struct ** get_task(pid_t pid)
     /*  */
 170 {
 171         struct task_struct ** p;
 172 
 173         p = task;
 174         while (++p < task+NR_TASKS) {
 175                 if (*p && (*p)->pid == pid)
 176                         return p;
 177         }
 178         return NULL;
 179 }
 180 
 181 static unsigned long get_phys_addr(struct task_struct ** p, unsigned long ptr)
     /*  */
 182 {
 183         unsigned long page;
 184 
 185         if (!p || !*p || ptr >= TASK_SIZE)
 186                 return 0;
 187         page = *PAGE_DIR_OFFSET((*p)->tss.cr3,ptr);
 188         if (!(page & PAGE_PRESENT))
 189                 return 0;
 190         page &= PAGE_MASK;
 191         page += PAGE_PTR(ptr);
 192         page = *(unsigned long *) page;
 193         if (!(page & PAGE_PRESENT))
 194                 return 0;
 195         page &= PAGE_MASK;
 196         page += ptr & ~PAGE_MASK;
 197         return page;
 198 }
 199 
 200 static int get_array(struct task_struct ** p, unsigned long start, unsigned long end, char * buffer)
     /*  */
 201 {
 202         unsigned long addr;
 203         int size = 0, result = 0;
 204         char c;
 205 
 206         if (start >= end)
 207                 return result;
 208         for (;;) {
 209                 addr = get_phys_addr(p, start);
 210                 if (!addr)
 211                         goto ready;
 212                 do {
 213                         c = *(char *) addr;
 214                         if (!c)
 215                                 result = size;
 216                         if (size < PAGE_SIZE)
 217                                 buffer[size++] = c;
 218                         else
 219                                 goto ready;
 220                         addr++;
 221                         start++;
 222                         if (!c && start >= end)
 223                                 goto ready;
 224                 } while (addr & ~PAGE_MASK);
 225         }
 226 ready:
 227         /* remove the trailing blanks, used to fillout argv,envp space */
 228         while (result>0 && buffer[result-1]==' ')
 229                 result--;
 230         return result;
 231 }
 232 
 233 static int get_env(int pid, char * buffer)
     /*  */
 234 {
 235         struct task_struct ** p = get_task(pid);
 236 
 237         if (!p || !*p)
 238                 return 0;
 239         return get_array(p, (*p)->env_start, (*p)->env_end, buffer);
 240 }
 241 
 242 static int get_arg(int pid, char * buffer)
     /*  */
 243 {
 244         struct task_struct ** p = get_task(pid);
 245 
 246         if (!p || !*p)
 247                 return 0;
 248         return get_array(p, (*p)->arg_start, (*p)->arg_end, buffer);
 249 }
 250 
 251 static unsigned long get_wchan(struct task_struct *p)
     /*  */
 252 {
 253         unsigned long ebp, eip;
 254         unsigned long stack_page;
 255         int count = 0;
 256 
 257         if (!p || p == current || p->state == TASK_RUNNING)
 258                 return 0;
 259         stack_page = p->kernel_stack_page;
 260         if (!stack_page)
 261                 return 0;
 262         ebp = p->tss.ebp;
 263         do {
 264                 if (ebp < stack_page || ebp >= 4092+stack_page)
 265                         return 0;
 266                 eip = *(unsigned long *) (ebp+4);
 267                 if ((void *)eip != sleep_on &&
 268                     (void *)eip != interruptible_sleep_on)
 269                         return eip;
 270                 ebp = *(unsigned long *) ebp;
 271         } while (count++ < 16);
 272         return 0;
 273 }
 274 
 275 #define KSTK_EIP(stack) (((unsigned long *)stack)[1019])
 276 #define KSTK_ESP(stack) (((unsigned long *)stack)[1022])
 277 
 278 static int get_stat(int pid, char * buffer)
     /*  */
 279 {
 280         struct task_struct ** p = get_task(pid);
 281         unsigned long sigignore=0, sigcatch=0, bit=1, wchan;
 282         unsigned long vsize, eip, esp;
 283         int i,tty_pgrp;
 284         char state;
 285 
 286         if (!p || !*p)
 287                 return 0;
 288         if ((*p)->state < 0 || (*p)->state > 5)
 289                 state = '.';
 290         else
 291                 state = "RSDZTD"[(*p)->state];
 292         eip = esp = 0;
 293         vsize = (*p)->kernel_stack_page;
 294         if (vsize) {
 295                 eip = KSTK_EIP(vsize);
 296                 esp = KSTK_ESP(vsize);
 297                 vsize = (*p)->brk - (*p)->start_code + PAGE_SIZE-1;
 298                 if (esp)
 299                         vsize += TASK_SIZE - esp;
 300         }
 301         wchan = get_wchan(*p);
 302         for(i=0; i<32; ++i) {
 303                 switch((int) (*p)->sigaction[i].sa_handler) {
 304                 case 1: sigignore |= bit; break;
 305                 case 0: break;
 306                 default: sigcatch |= bit;
 307                 } bit <<= 1;
 308         }
 309         tty_pgrp = (*p)->tty;
 310         if (tty_pgrp > 0 && tty_table[tty_pgrp])
 311                 tty_pgrp = tty_table[tty_pgrp]->pgrp;
 312         else
 313                 tty_pgrp = -1;
 314         return sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
 315 %lu %lu %lu %ld %ld %ld %ld %ld %ld %lu %lu %ld %lu %u %u %lu %lu %lu %lu %lu %lu \
 316 %lu %lu %lu %lu\n",
 317                 pid,
 318                 (*p)->comm,
 319                 state,
 320                 (*p)->p_pptr->pid,
 321                 (*p)->pgrp,
 322                 (*p)->session,
 323                 (*p)->tty,
 324                 tty_pgrp,
 325                 (*p)->flags,
 326                 (*p)->min_flt,
 327                 (*p)->cmin_flt,
 328                 (*p)->maj_flt,
 329                 (*p)->cmaj_flt,
 330                 (*p)->utime,
 331                 (*p)->stime,
 332                 (*p)->cutime,
 333                 (*p)->cstime,
 334                 (*p)->counter,  /* this is the kernel priority ---
 335                                    subtract 30 in your user-level program. */
 336                 (*p)->priority, /* this is the nice value ---
 337                                    subtract 15 in your user-level program. */
 338                 (*p)->timeout,
 339                 (*p)->it_real_value,
 340                 (*p)->start_time,
 341                 vsize,
 342                 (*p)->rss, /* you might want to shift this left 3 */
 343                 (*p)->rlim[RLIMIT_RSS].rlim_cur,
 344                 (*p)->start_code,
 345                 (*p)->end_code,
 346                 (*p)->start_stack,
 347                 esp,
 348                 eip,
 349                 (*p)->signal,
 350                 (*p)->blocked,
 351                 sigignore,
 352                 sigcatch,
 353                 wchan);
 354 }
 355 
 356 static int get_statm(int pid, char * buffer)
     /*  */
 357 {
 358         struct task_struct ** p = get_task(pid);
 359         int i, tpag;
 360         int size=0, resident=0, share=0, trs=0, lrs=0, drs=0, dt=0;
 361         unsigned long ptbl, *buf, *pte, *pagedir, map_nr;
 362 
 363         if (!p || !*p)
 364                 return 0;
 365         tpag = (*p)->end_code / PAGE_SIZE;
 366         if ((*p)->state != TASK_ZOMBIE) {
 367           pagedir = (unsigned long *) (*p)->tss.cr3;
 368           for (i = 0; i < 0x300; ++i) {
 369             if ((ptbl = pagedir[i]) == 0) {
 370               tpag -= PTRS_PER_PAGE;
 371               continue;
 372             }
 373             buf = (unsigned long *)(ptbl & PAGE_MASK);
 374             for (pte = buf; pte < (buf + PTRS_PER_PAGE); ++pte) {
 375               if (*pte != 0) {
 376                 ++size;
 377                 if (*pte & 1) {
 378                   ++resident;
 379                   if (tpag > 0)
 380                     ++trs;
 381                   else
 382                     ++drs;
 383                   if (i >= 15 && i < 0x2f0) {
 384                     ++lrs;
 385                     if (*pte & 0x40)
 386                       ++dt;
 387                     else
 388                       --drs;
 389                   }
 390                   map_nr = MAP_NR(*pte);
 391                   if (map_nr < (high_memory / PAGE_SIZE) && mem_map[map_nr] > 1)
 392                     ++share;
 393                 }
 394               }
 395               --tpag;
 396             }
 397           }
 398         }
 399         return sprintf(buffer,"%d %d %d %d %d %d %d\n",
 400                        size, resident, share, trs, lrs, drs, dt);
 401 }
 402 
 403 static int get_maps(int pid, char *buf)
     /*  */
 404 {
 405         int sz = 0;
 406         struct task_struct **p = get_task(pid);
 407         struct vm_area_struct *map;
 408 
 409         if (!p || !*p)
 410                 return 0;
 411 
 412         for(map = (*p)->mmap; map != NULL; map = map->vm_next) {
 413                 char str[7], *cp = str;
 414                 int prot = map->vm_page_prot;
 415                 int perms, flags;
 416                 int end = sz + 80;      /* Length of line */
 417                 dev_t dev;
 418                 unsigned long ino;
 419 
 420                 /*
 421                  * This tries to get an "rwxsp" string out of silly
 422                  * intel page permissions.  The vm_area_struct should
 423                  * probably have the original mmap args preserved.
 424                  */
 425                 
 426                 flags = perms = 0;
 427 
 428                 if ((prot & PAGE_READONLY) == PAGE_READONLY)
 429                         perms |= PROT_READ | PROT_EXEC;
 430                 if (prot & (PAGE_COW|PAGE_RW)) {
 431                         perms |= PROT_WRITE | PROT_READ;
 432                         flags = prot & PAGE_COW ? MAP_PRIVATE : MAP_SHARED;
 433                 }
 434 
 435                 *cp++ = perms & PROT_READ ? 'r' : '-';
 436                 *cp++ = perms & PROT_WRITE ? 'w' : '-';
 437                 *cp++ = perms & PROT_EXEC ? 'x' : '-';
 438                 *cp++ = flags & MAP_SHARED ? 's' : '-';
 439                 *cp++ = flags & MAP_PRIVATE ? 'p' : '-';
 440                 *cp++ = 0;
 441                 
 442                 if (end >= PAGE_SIZE) {
 443                         sprintf(buf+sz, "...\n");
 444                         break;
 445                 }
 446                 
 447                 if (map->vm_inode != NULL) {
 448                         dev = map->vm_inode->i_dev;
 449                         ino = map->vm_inode->i_ino;
 450                 } else {
 451                         dev = 0;
 452                         ino = 0;
 453                 }
 454 
 455                 sz += sprintf(buf+sz, "%08lx-%08lx %s %08lx %02x:%02x %lu\n",
 456                               map->vm_start, map->vm_end, str, map->vm_offset,
 457                               MAJOR(dev),MINOR(dev), ino);
 458                 if (sz > end) {
 459                         printk("get_maps: end(%d) < sz(%d)\n", end, sz);
 460                         break;
 461                 }
 462         }
 463         
 464         return sz;
 465 }
 466 
 467 extern int get_module_list(char *);
 468 extern int get_device_list(char *);
 469 
 470 static int array_read(struct inode * inode, struct file * file,char * buf, int count)
     /*  */
 471 {
 472         char * page;
 473         int length;
 474         int end;
 475         unsigned int type, pid;
 476 
 477         if (count < 0)
 478                 return -EINVAL;
 479         if (!(page = (char*) __get_free_page(GFP_KERNEL)))
 480                 return -ENOMEM;
 481         type = inode->i_ino;
 482         pid = type >> 16;
 483         type &= 0x0000ffff;
 484         switch (type) {
 485                 case 2:
 486                         length = get_loadavg(page);
 487                         break;
 488                 case 3:
 489                         length = get_uptime(page);
 490                         break;
 491                 case 4:
 492                         length = get_meminfo(page);
 493                         break;
 494                 case 6:
 495                         length = get_version(page);
 496                         break;
 497                 case 9:
 498                         length = get_env(pid, page);
 499                         break;
 500                 case 10:
 501                         length = get_arg(pid, page);
 502                         break;
 503                 case 11:
 504                         length = get_stat(pid, page);
 505                         break;
 506                 case 12:
 507                         length = get_statm(pid, page);
 508                         break;
 509 #ifdef CONFIG_DEBUG_MALLOC
 510                 case 13:
 511                         length = get_malloc(page);
 512                         break;
 513 #endif
 514                 case 14:
 515                         free_page((unsigned long) page);
 516                         return read_core(inode, file, buf, count);
 517                 case 15:
 518                         length = get_maps(pid, page);
 519                         break;
 520                 case 16:
 521                         length = get_module_list(page);
 522                         break;
 523                 case 17:
 524                         length = get_kstat(page);
 525                         break;
 526                 case 18:
 527                         length = get_device_list(page);
 528                         break;
 529                 default:
 530                         free_page((unsigned long) page);
 531                         return -EBADF;
 532         }
 533         if (file->f_pos >= length) {
 534                 free_page((unsigned long) page);
 535                 return 0;
 536         }
 537         if (count + file->f_pos > length)
 538                 count = length - file->f_pos;
 539         end = count + file->f_pos;
 540         memcpy_tofs(buf, page + file->f_pos, count);
 541         free_page((unsigned long) page);
 542         file->f_pos = end;
 543         return count;
 544 }
 545 
 546 static struct file_operations proc_array_operations = {
 547         NULL,           /* array_lseek */
 548         array_read,
 549         NULL,           /* array_write */
 550         NULL,           /* array_readdir */
 551         NULL,           /* array_select */
 552         NULL,           /* array_ioctl */
 553         NULL,           /* mmap */
 554         NULL,           /* no special open code */
 555         NULL,           /* no special release code */
 556         NULL            /* can't fsync */
 557 };
 558 
 559 struct inode_operations proc_array_inode_operations = {
 560         &proc_array_operations, /* default base directory file-ops */
 561         NULL,                   /* create */
 562         NULL,                   /* lookup */
 563         NULL,                   /* link */
 564         NULL,                   /* unlink */
 565         NULL,                   /* symlink */
 566         NULL,                   /* mkdir */
 567         NULL,                   /* rmdir */
 568         NULL,                   /* mknod */
 569         NULL,                   /* rename */
 570         NULL,                   /* readlink */
 571         NULL,                   /* follow_link */
 572         NULL,                   /* bmap */
 573         NULL,                   /* truncate */
 574         NULL                    /* permission */
 575 };
/* */
root/fs/proc/array.c

DEFINITIONS
