fs/proc/array.c

/* */
This source file includes following definitions.
get_loadavg
get_uptime
get_meminfo
get_version
get_task
get_phys_addr
get_array
get_env
get_arg
get_wchan
get_stat
get_statm
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/tty.h>
  15 
  16 #include <asm/segment.h>
  17 #include <asm/io.h>
  18 
  19 #define LOAD_INT(x) ((x) >> FSHIFT)
  20 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  21 
  22 #ifdef CONFIG_DEBUG_MALLOC
  23 int get_malloc(char * buffer);
  24 #endif
  25 
  26 static int get_loadavg(char * buffer)
     /*  */
  27 {
  28         int a, b, c;
  29 
  30         a = avenrun[0] + (FIXED_1/200);
  31         b = avenrun[1] + (FIXED_1/200);
  32         c = avenrun[2] + (FIXED_1/200);
  33         return sprintf(buffer,"%d.%02d %d.%02d %d.%02d\n",
  34                 LOAD_INT(a), LOAD_FRAC(a),
  35                 LOAD_INT(b), LOAD_FRAC(b),
  36                 LOAD_INT(c), LOAD_FRAC(c));
  37 }
  38 
  39 static int get_uptime(char * buffer)
     /*  */
  40 {
  41         unsigned long uptime;
  42         unsigned long idle;
  43 
  44         uptime = jiffies + jiffies_offset;
  45         idle = task[0]->utime + task[0]->stime;
  46         return sprintf(buffer,"%d.%02d %d.%02d\n",
  47                 uptime / HZ,
  48                 uptime % HZ,
  49                 idle / HZ,
  50                 idle % HZ);
  51 }
  52 
  53 static int get_meminfo(char * buffer)
     /*  */
  54 {
  55         struct sysinfo i;
  56 
  57         si_meminfo(&i);
  58         si_swapinfo(&i);
  59         return sprintf(buffer, "        total:   used:    free:   shared:  buffers:\n"
  60                 "Mem:  %8d %8d %8d %8d %8d\n"
  61                 "Swap: %8d %8d %8d\n",
  62                 i.totalram, i.totalram-i.freeram, i.freeram, i.sharedram, i.bufferram,
  63                 i.totalswap, i.totalswap-i.freeswap, i.freeswap);
  64 }
  65 
  66 static int get_version(char * buffer)
     /*  */
  67 {
  68         extern char *linux_banner;
  69 
  70         strcpy(buffer, linux_banner);
  71         return strlen(buffer);
  72 }
  73 
  74 static struct task_struct ** get_task(pid_t pid)
     /*  */
  75 {
  76         struct task_struct ** p;
  77 
  78         p = task;
  79         while (++p < task+NR_TASKS) {
  80                 if (*p && (*p)->pid == pid)
  81                         return p;
  82         }
  83         return NULL;
  84 }
  85 
  86 static unsigned long get_phys_addr(struct task_struct ** p, unsigned long ptr)
     /*  */
  87 {
  88         unsigned long page;
  89 
  90         if (!p || !*p || ptr >= TASK_SIZE)
  91                 return 0;
  92         page = (*p)->tss.cr3;
  93         page += (ptr >> 20) & 0xffc;
  94         page = *(unsigned long *) page;
  95         if (!(page & 1))
  96                 return 0;
  97         page &= 0xfffff000;
  98         page += (ptr >> 10) & 0xffc;
  99         page = *(unsigned long *) page;
 100         if (!(page & 1))
 101                 return 0;
 102         page &= 0xfffff000;
 103         page += ptr & 0xfff;
 104         return page;
 105 }
 106 
 107 static int get_array(struct task_struct ** p, unsigned long start, unsigned long end, char * buffer)
     /*  */
 108 {
 109         unsigned long addr;
 110         int size = 0, result = 0;
 111         char c;
 112 
 113         if (start >= end)
 114                 return result;
 115         for (;;) {
 116                 addr = get_phys_addr(p, start);
 117                 if (!addr)
 118                         return result;
 119                 do {
 120                         c = *(char *) addr;
 121                         if (!c)
 122                                 result = size;
 123                         if (size < PAGE_SIZE)
 124                                 buffer[size++] = c;
 125                         else
 126                                 return result;
 127                         addr++;
 128                         start++;
 129                         if (start >= end)
 130                                 return result;
 131                 } while (!(addr & 0xfff));
 132         }
 133 }
 134 
 135 static int get_env(int pid, char * buffer)
     /*  */
 136 {
 137         struct task_struct ** p = get_task(pid);
 138 
 139         if (!p || !*p)
 140                 return 0;
 141         return get_array(p, (*p)->env_start, (*p)->env_end, buffer);
 142 }
 143 
 144 static int get_arg(int pid, char * buffer)
     /*  */
 145 {
 146         struct task_struct ** p = get_task(pid);
 147 
 148         if (!p || !*p)
 149                 return 0;
 150         return get_array(p, (*p)->arg_start, (*p)->arg_end, buffer);
 151 }
 152 
 153 static unsigned long get_wchan(struct task_struct *p)
     /*  */
 154 {
 155         unsigned long ebp, eip;
 156         unsigned long stack_page;
 157         int count = 0;
 158 
 159         if (!p || p == current || p->state == TASK_RUNNING)
 160                 return 0;
 161         stack_page = p->kernel_stack_page;
 162         if (!stack_page)
 163                 return 0;
 164         ebp = p->tss.ebp;
 165         do {
 166                 if (ebp < stack_page || ebp >= 4092+stack_page)
 167                         return 0;
 168                 eip = *(unsigned long *) (ebp+4);
 169                 if ((void *)eip != sleep_on &&
 170                     (void *)eip != interruptible_sleep_on)
 171                         return eip;
 172                 ebp = *(unsigned long *) ebp;
 173         } while (count++ < 16);
 174         return 0;
 175 }
 176 
 177 #define KSTK_EIP(stack) (((unsigned long *)stack)[1019])
 178 #define KSTK_ESP(stack) (((unsigned long *)stack)[1022])
 179 
 180 static int get_stat(int pid, char * buffer)
     /*  */
 181 {
 182         struct task_struct ** p = get_task(pid);
 183         unsigned long sigignore=0, sigcatch=0, bit=1, wchan;
 184         unsigned long vsize, eip, esp;
 185         int i,tty_pgrp;
 186         char state;
 187 
 188         if (!p || !*p)
 189                 return 0;
 190         if ((*p)->state < 0 || (*p)->state > 5)
 191                 state = '.';
 192         else
 193                 state = "RSDZTD"[(*p)->state];
 194         eip = esp = 0;
 195         vsize = (*p)->kernel_stack_page;
 196         if (vsize) {
 197                 eip = KSTK_EIP(vsize);
 198                 esp = KSTK_ESP(vsize);
 199                 vsize = (*p)->brk + 4095;
 200                 if (esp)
 201                         vsize += TASK_SIZE - esp;
 202         }
 203         wchan = get_wchan(*p);
 204         for(i=0; i<32; ++i) {
 205                 switch((int) (*p)->sigaction[i].sa_handler) {
 206                 case 1: sigignore |= bit; break;
 207                 case 0: break;
 208                 default: sigcatch |= bit;
 209                 } bit <<= 1;
 210         }
 211         tty_pgrp = (*p)->tty;
 212         if (tty_pgrp > 0 && tty_table[tty_pgrp])
 213                 tty_pgrp = tty_table[tty_pgrp]->pgrp;
 214         else
 215                 tty_pgrp = -1;
 216         return sprintf(buffer,"%d (%s) %c %d %d %d %d %d %u %u \
 217 %u %u %u %d %d %d %d %d %d %u %u %d %u %u %u %u %u %u %u %u %d \
 218 %d %d %d %u\n",
 219                 pid,
 220                 (*p)->comm,
 221                 state,
 222                 (*p)->p_pptr->pid,
 223                 (*p)->pgrp,
 224                 (*p)->session,
 225                 (*p)->tty,
 226                 tty_pgrp,
 227                 (*p)->flags,
 228                 (*p)->min_flt,
 229                 (*p)->cmin_flt,
 230                 (*p)->maj_flt,
 231                 (*p)->cmaj_flt,
 232                 (*p)->utime,
 233                 (*p)->stime,
 234                 (*p)->cutime,
 235                 (*p)->cstime,
 236                 (*p)->counter,  /* this is the kernel priority ---
 237                                    subtract 30 in your user-level program. */
 238                 (*p)->priority, /* this is the nice value ---
 239                                    subtract 15 in your user-level program. */
 240                 (*p)->timeout,
 241                 (*p)->it_real_value,
 242                 (*p)->start_time,
 243                 vsize,
 244                 (*p)->rss, /* you might want to shift this left 3 */
 245                 (*p)->rlim[RLIMIT_RSS].rlim_cur,
 246                 (*p)->start_code,
 247                 (*p)->end_code,
 248                 (*p)->start_stack,
 249                 esp,
 250                 eip,
 251                 (*p)->signal,
 252                 (*p)->blocked,
 253                 sigignore,
 254                 sigcatch,
 255                 wchan);
 256 }
 257 
 258 static int get_statm(int pid, char * buffer)
     /*  */
 259 {
 260         struct task_struct ** p = get_task(pid);
 261         int i, tpag;
 262         int size=0, resident=0, share=0, trs=0, lrs=0, drs=0, dt=0;
 263         unsigned long ptbl, *buf, *pte, *pagedir, map_nr;
 264 
 265         if (!p || !*p)
 266                 return 0;
 267         tpag = (*p)->end_code / PAGE_SIZE;
 268         if ((*p)->state != TASK_ZOMBIE) {
 269           pagedir = (unsigned long *)((*p)->tss.cr3 + ((*p)->start_code >> 20));
 270           for (i = 0; i < 0x300; ++i) {
 271             if ((ptbl = pagedir[i]) == 0) {
 272               tpag -= 1024;
 273               continue;
 274             }
 275             buf = (unsigned long *)(ptbl & 0xfffff000);
 276             for (pte = buf; pte < (buf + 1024); ++pte) {
 277               if (*pte != 0) {
 278                 ++size;
 279                 if (*pte & 1) {
 280                   ++resident;
 281                   if (tpag > 0)
 282                     ++trs;
 283                   else
 284                     ++drs;
 285                   if (i >= 15 && i < 0x2f0) {
 286                     ++lrs;
 287                     if (*pte & 0x40)
 288                       ++dt;
 289                     else
 290                       --drs;
 291                   }
 292                   map_nr = MAP_NR(*pte);
 293                   if (map_nr < (high_memory / 4096) && mem_map[map_nr] > 1)
 294                     ++share;
 295                 }
 296               }
 297               --tpag;
 298             }
 299           }
 300         }
 301         return sprintf(buffer,"%d %d %d %d %d %d %d\n",
 302                        size, resident, share, trs, lrs, drs, dt);
 303 }
 304 
 305 static int array_read(struct inode * inode, struct file * file,char * buf, int count)
     /*  */
 306 {
 307         char * page;
 308         int length;
 309         int end;
 310         unsigned int type, pid;
 311 
 312         if (count < 0)
 313                 return -EINVAL;
 314         page = (char *) get_free_page(GFP_KERNEL);
 315         if (!page)
 316                 return -ENOMEM;
 317         type = inode->i_ino;
 318         pid = type >> 16;
 319         type &= 0x0000ffff;
 320         switch (type) {
 321                 case 2:
 322                         length = get_loadavg(page);
 323                         break;
 324                 case 3:
 325                         length = get_uptime(page);
 326                         break;
 327                 case 4:
 328                         length = get_meminfo(page);
 329                         break;
 330                 case 6:
 331                         length = get_version(page);
 332                         break;
 333                 case 9:
 334                         length = get_env(pid, page);
 335                         break;
 336                 case 10:
 337                         length = get_arg(pid, page);
 338                         break;
 339                 case 11:
 340                         length = get_stat(pid, page);
 341                         break;
 342                 case 12:
 343                         length = get_statm(pid, page);
 344                         break;
 345 #ifdef CONFIG_DEBUG_MALLOC
 346                 case 13:
 347                         length = get_malloc(page);
 348                         break;
 349 #endif
 350                 default:
 351                         free_page((unsigned long) page);
 352                         return -EBADF;
 353         }
 354         if (file->f_pos >= length) {
 355                 free_page((unsigned long) page);
 356                 return 0;
 357         }
 358         if (count + file->f_pos > length)
 359                 count = length - file->f_pos;
 360         end = count + file->f_pos;
 361         memcpy_tofs(buf, page + file->f_pos, count);
 362         free_page((unsigned long) page);
 363         file->f_pos = end;
 364         return count;
 365 }
 366 
 367 static struct file_operations proc_array_operations = {
 368         NULL,           /* array_lseek */
 369         array_read,
 370         NULL,           /* array_write */
 371         NULL,           /* array_readdir */
 372         NULL,           /* array_select */
 373         NULL,           /* array_ioctl */
 374         NULL,           /* mmap */
 375         NULL,           /* no special open code */
 376         NULL,           /* no special release code */
 377         NULL            /* can't fsync */
 378 };
 379 
 380 struct inode_operations proc_array_inode_operations = {
 381         &proc_array_operations, /* default base directory file-ops */
 382         NULL,                   /* create */
 383         NULL,                   /* lookup */
 384         NULL,                   /* link */
 385         NULL,                   /* unlink */
 386         NULL,                   /* symlink */
 387         NULL,                   /* mkdir */
 388         NULL,                   /* rmdir */
 389         NULL,                   /* mknod */
 390         NULL,                   /* rename */
 391         NULL,                   /* readlink */
 392         NULL,                   /* follow_link */
 393         NULL,                   /* bmap */
 394         NULL,                   /* truncate */
 395         NULL                    /* permission */
 396 };
/* */
root/fs/proc/array.c

DEFINITIONS
