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 = *PAGE_DIR_OFFSET((*p)->tss.cr3,ptr);
  93         if (!(page & 1))
  94                 return 0;
  95         page &= PAGE_MASK;
  96         page += PAGE_PTR(ptr);
  97         page = *(unsigned long *) page;
  98         if (!(page & 1))
  99                 return 0;
 100         page &= PAGE_MASK;
 101         page += ptr & ~PAGE_MASK;
 102         return page;
 103 }
 104 
 105 static int get_array(struct task_struct ** p, unsigned long start, unsigned long end, char * buffer)
     /*  */
 106 {
 107         unsigned long addr;
 108         int size = 0, result = 0;
 109         char c;
 110 
 111         if (start >= end)
 112                 return result;
 113         for (;;) {
 114                 addr = get_phys_addr(p, start);
 115                 if (!addr)
 116                         return result;
 117                 do {
 118                         c = *(char *) addr;
 119                         if (!c)
 120                                 result = size;
 121                         if (size < PAGE_SIZE)
 122                                 buffer[size++] = c;
 123                         else
 124                                 return result;
 125                         addr++;
 126                         start++;
 127                         if (start >= end)
 128                                 return result;
 129                 } while (!(addr & ~PAGE_MASK));
 130         }
 131 }
 132 
 133 static int get_env(int pid, char * buffer)
     /*  */
 134 {
 135         struct task_struct ** p = get_task(pid);
 136 
 137         if (!p || !*p)
 138                 return 0;
 139         return get_array(p, (*p)->env_start, (*p)->env_end, buffer);
 140 }
 141 
 142 static int get_arg(int pid, char * buffer)
     /*  */
 143 {
 144         struct task_struct ** p = get_task(pid);
 145 
 146         if (!p || !*p)
 147                 return 0;
 148         return get_array(p, (*p)->arg_start, (*p)->arg_end, buffer);
 149 }
 150 
 151 static unsigned long get_wchan(struct task_struct *p)
     /*  */
 152 {
 153         unsigned long ebp, eip;
 154         unsigned long stack_page;
 155         int count = 0;
 156 
 157         if (!p || p == current || p->state == TASK_RUNNING)
 158                 return 0;
 159         stack_page = p->kernel_stack_page;
 160         if (!stack_page)
 161                 return 0;
 162         ebp = p->tss.ebp;
 163         do {
 164                 if (ebp < stack_page || ebp >= 4092+stack_page)
 165                         return 0;
 166                 eip = *(unsigned long *) (ebp+4);
 167                 if ((void *)eip != sleep_on &&
 168                     (void *)eip != interruptible_sleep_on)
 169                         return eip;
 170                 ebp = *(unsigned long *) ebp;
 171         } while (count++ < 16);
 172         return 0;
 173 }
 174 
 175 #define KSTK_EIP(stack) (((unsigned long *)stack)[1019])
 176 #define KSTK_ESP(stack) (((unsigned long *)stack)[1022])
 177 
 178 static int get_stat(int pid, char * buffer)
     /*  */
 179 {
 180         struct task_struct ** p = get_task(pid);
 181         unsigned long sigignore=0, sigcatch=0, bit=1, wchan;
 182         unsigned long vsize, eip, esp;
 183         int i,tty_pgrp;
 184         char state;
 185 
 186         if (!p || !*p)
 187                 return 0;
 188         if ((*p)->state < 0 || (*p)->state > 5)
 189                 state = '.';
 190         else
 191                 state = "RSDZTD"[(*p)->state];
 192         eip = esp = 0;
 193         vsize = (*p)->kernel_stack_page;
 194         if (vsize) {
 195                 eip = KSTK_EIP(vsize);
 196                 esp = KSTK_ESP(vsize);
 197                 vsize = (*p)->brk + PAGE_SIZE-1;
 198                 if (esp)
 199                         vsize += TASK_SIZE - esp;
 200         }
 201         wchan = get_wchan(*p);
 202         for(i=0; i<32; ++i) {
 203                 switch((int) (*p)->sigaction[i].sa_handler) {
 204                 case 1: sigignore |= bit; break;
 205                 case 0: break;
 206                 default: sigcatch |= bit;
 207                 } bit <<= 1;
 208         }
 209         tty_pgrp = (*p)->tty;
 210         if (tty_pgrp > 0 && tty_table[tty_pgrp])
 211                 tty_pgrp = tty_table[tty_pgrp]->pgrp;
 212         else
 213                 tty_pgrp = -1;
 214         return sprintf(buffer,"%d (%s) %c %d %d %d %d %d %u %u \
 215 %u %u %u %d %d %d %d %d %d %u %u %d %u %u %u %u %u %u %u %u %d \
 216 %d %d %d %u\n",
 217                 pid,
 218                 (*p)->comm,
 219                 state,
 220                 (*p)->p_pptr->pid,
 221                 (*p)->pgrp,
 222                 (*p)->session,
 223                 (*p)->tty,
 224                 tty_pgrp,
 225                 (*p)->flags,
 226                 (*p)->min_flt,
 227                 (*p)->cmin_flt,
 228                 (*p)->maj_flt,
 229                 (*p)->cmaj_flt,
 230                 (*p)->utime,
 231                 (*p)->stime,
 232                 (*p)->cutime,
 233                 (*p)->cstime,
 234                 (*p)->counter,  /* this is the kernel priority ---
 235                                    subtract 30 in your user-level program. */
 236                 (*p)->priority, /* this is the nice value ---
 237                                    subtract 15 in your user-level program. */
 238                 (*p)->timeout,
 239                 (*p)->it_real_value,
 240                 (*p)->start_time,
 241                 vsize,
 242                 (*p)->rss, /* you might want to shift this left 3 */
 243                 (*p)->rlim[RLIMIT_RSS].rlim_cur,
 244                 (*p)->start_code,
 245                 (*p)->end_code,
 246                 (*p)->start_stack,
 247                 esp,
 248                 eip,
 249                 (*p)->signal,
 250                 (*p)->blocked,
 251                 sigignore,
 252                 sigcatch,
 253                 wchan);
 254 }
 255 
 256 static int get_statm(int pid, char * buffer)
     /*  */
 257 {
 258         struct task_struct ** p = get_task(pid);
 259         int i, tpag;
 260         int size=0, resident=0, share=0, trs=0, lrs=0, drs=0, dt=0;
 261         unsigned long ptbl, *buf, *pte, *pagedir, map_nr;
 262 
 263         if (!p || !*p)
 264                 return 0;
 265         tpag = (*p)->end_code / PAGE_SIZE;
 266         if ((*p)->state != TASK_ZOMBIE) {
 267           pagedir = PAGE_DIR_OFFSET((*p)->tss.cr3,(*p)->start_code);
 268           for (i = 0; i < 0x300; ++i) {
 269             if ((ptbl = pagedir[i]) == 0) {
 270               tpag -= PTRS_PER_PAGE;
 271               continue;
 272             }
 273             buf = (unsigned long *)(ptbl & PAGE_MASK);
 274             for (pte = buf; pte < (buf + PTRS_PER_PAGE); ++pte) {
 275               if (*pte != 0) {
 276                 ++size;
 277                 if (*pte & 1) {
 278                   ++resident;
 279                   if (tpag > 0)
 280                     ++trs;
 281                   else
 282                     ++drs;
 283                   if (i >= 15 && i < 0x2f0) {
 284                     ++lrs;
 285                     if (*pte & 0x40)
 286                       ++dt;
 287                     else
 288                       --drs;
 289                   }
 290                   map_nr = MAP_NR(*pte);
 291                   if (map_nr < (high_memory / PAGE_SIZE) && mem_map[map_nr] > 1)
 292                     ++share;
 293                 }
 294               }
 295               --tpag;
 296             }
 297           }
 298         }
 299         return sprintf(buffer,"%d %d %d %d %d %d %d\n",
 300                        size, resident, share, trs, lrs, drs, dt);
 301 }
 302 
 303 static int array_read(struct inode * inode, struct file * file,char * buf, int count)
     /*  */
 304 {
 305         char * page;
 306         int length;
 307         int end;
 308         unsigned int type, pid;
 309 
 310         if (count < 0)
 311                 return -EINVAL;
 312         if (!(page = (char*) __get_free_page(GFP_KERNEL)))
 313                 return -ENOMEM;
 314         type = inode->i_ino;
 315         pid = type >> 16;
 316         type &= 0x0000ffff;
 317         switch (type) {
 318                 case 2:
 319                         length = get_loadavg(page);
 320                         break;
 321                 case 3:
 322                         length = get_uptime(page);
 323                         break;
 324                 case 4:
 325                         length = get_meminfo(page);
 326                         break;
 327                 case 6:
 328                         length = get_version(page);
 329                         break;
 330                 case 9:
 331                         length = get_env(pid, page);
 332                         break;
 333                 case 10:
 334                         length = get_arg(pid, page);
 335                         break;
 336                 case 11:
 337                         length = get_stat(pid, page);
 338                         break;
 339                 case 12:
 340                         length = get_statm(pid, page);
 341                         break;
 342 #ifdef CONFIG_DEBUG_MALLOC
 343                 case 13:
 344                         length = get_malloc(page);
 345                         break;
 346 #endif
 347                 default:
 348                         free_page((unsigned long) page);
 349                         return -EBADF;
 350         }
 351         if (file->f_pos >= length) {
 352                 free_page((unsigned long) page);
 353                 return 0;
 354         }
 355         if (count + file->f_pos > length)
 356                 count = length - file->f_pos;
 357         end = count + file->f_pos;
 358         memcpy_tofs(buf, page + file->f_pos, count);
 359         free_page((unsigned long) page);
 360         file->f_pos = end;
 361         return count;
 362 }
 363 
 364 static struct file_operations proc_array_operations = {
 365         NULL,           /* array_lseek */
 366         array_read,
 367         NULL,           /* array_write */
 368         NULL,           /* array_readdir */
 369         NULL,           /* array_select */
 370         NULL,           /* array_ioctl */
 371         NULL,           /* mmap */
 372         NULL,           /* no special open code */
 373         NULL,           /* no special release code */
 374         NULL            /* can't fsync */
 375 };
 376 
 377 struct inode_operations proc_array_inode_operations = {
 378         &proc_array_operations, /* default base directory file-ops */
 379         NULL,                   /* create */
 380         NULL,                   /* lookup */
 381         NULL,                   /* link */
 382         NULL,                   /* unlink */
 383         NULL,                   /* symlink */
 384         NULL,                   /* mkdir */
 385         NULL,                   /* rmdir */
 386         NULL,                   /* mknod */
 387         NULL,                   /* rename */
 388         NULL,                   /* readlink */
 389         NULL,                   /* follow_link */
 390         NULL,                   /* bmap */
 391         NULL,                   /* truncate */
 392         NULL                    /* permission */
 393 };
/* */
root/fs/proc/array.c

DEFINITIONS
