fs/proc/array.c

/* */
This source file includes following definitions.
get_loadavg
get_uptime
get_meminfo
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 #define KSTK_EIP(stack) (((char *)stack)[1019])
  23 #define KSTK_ESP(stack) (((char *)stack)[1022])
  24 
  25 #define _SSIZE(stack)   (TASK_SIZE - KSTK_ESP(stack))
  26 #define SSIZE(stack)    (KSTK_ESP(stack) ? _SSIZE(stack) : 0)
  27 
  28 #define VSIZE(task,stack) ((task)->brk + 1023 + SSIZE(stack))
  29 
  30 
  31 static int get_loadavg(char * buffer)
     /*  */
  32 {
  33         int a, b, c;
  34 
  35         a = avenrun[0] + (FIXED_1/200);
  36         b = avenrun[1] + (FIXED_1/200);
  37         c = avenrun[2] + (FIXED_1/200);
  38         return sprintf(buffer,"%d.%02d %d.%02d %d.%02d\n",
  39                 LOAD_INT(a), LOAD_FRAC(a),
  40                 LOAD_INT(b), LOAD_FRAC(b),
  41                 LOAD_INT(c), LOAD_FRAC(c));
  42 }
  43 
  44 static int get_uptime(char * buffer)
     /*  */
  45 {
  46         return sprintf(buffer,"%d\n",(jiffies+jiffies_offset)/HZ);
  47 }
  48 
  49 static int get_meminfo(char * buffer)
     /*  */
  50 {
  51         struct sysinfo i;
  52 
  53         si_meminfo(&i);
  54         si_swapinfo(&i);
  55         return sprintf(buffer, "        total:   used:    free:   shared:  buffers:\n"
  56                 "Mem:  %8d %8d %8d %8d %8d\n"
  57                 "Swap: %8d %8d %8d\n",
  58                 i.totalram, i.totalram-i.freeram, i.freeram, i.sharedram, i.bufferram,
  59                 i.totalswap, i.totalswap-i.freeswap, i.freeswap);
  60 }
  61 
  62 static struct task_struct ** get_task(pid_t pid)
     /*  */
  63 {
  64         struct task_struct ** p;
  65 
  66         p = task;
  67         while (++p < task+NR_TASKS) {
  68                 if (*p && (*p)->pid == pid)
  69                         return p;
  70         }
  71         return NULL;
  72 }
  73 
  74 static unsigned long get_phys_addr(struct task_struct ** p, unsigned long ptr)
     /*  */
  75 {
  76         unsigned long page;
  77 
  78         if (!p || !*p || ptr >= TASK_SIZE)
  79                 return 0;
  80         page = (*p)->tss.cr3;
  81         page += (ptr >> 20) & 0xffc;
  82         page = *(unsigned long *) page;
  83         if (!(page & 1))
  84                 return 0;
  85         page &= 0xfffff000;
  86         page += (ptr >> 10) & 0xffc;
  87         page = *(unsigned long *) page;
  88         if (!(page & 1))
  89                 return 0;
  90         page &= 0xfffff000;
  91         page += ptr & 0xfff;
  92         return page;
  93 }
  94 
  95 static int get_array(struct task_struct ** p, unsigned long start, unsigned long end, char * buffer)
     /*  */
  96 {
  97         unsigned long addr;
  98         int size = 0, result = 0;
  99         char c;
 100 
 101         if (start >= end)
 102                 return result;
 103         for (;;) {
 104                 addr = get_phys_addr(p, start);
 105                 if (!addr)
 106                         return result;
 107                 do {
 108                         c = *(char *) addr;
 109                         if (!c)
 110                                 result = size;
 111                         if (size < PAGE_SIZE)
 112                                 buffer[size++] = c;
 113                         else
 114                                 return result;
 115                         addr++;
 116                         start++;
 117                         if (start >= end)
 118                                 return result;
 119                 } while (!(addr & 0xfff));
 120         }
 121 }
 122 
 123 static int get_env(int pid, char * buffer)
     /*  */
 124 {
 125         struct task_struct ** p = get_task(pid);
 126 
 127         if (!p || !*p)
 128                 return 0;
 129         return get_array(p, (*p)->env_start, (*p)->env_end, buffer);
 130 }
 131 
 132 static int get_arg(int pid, char * buffer)
     /*  */
 133 {
 134         struct task_struct ** p = get_task(pid);
 135 
 136         if (!p || !*p)
 137                 return 0;
 138         return get_array(p, (*p)->arg_start, (*p)->arg_end, buffer);
 139 }
 140 
 141 static unsigned long get_wchan(struct task_struct *p)
     /*  */
 142 {
 143         unsigned long ebp, eip;
 144         unsigned long stack_page;
 145         int count = 0;
 146 
 147         if (!p || p == current)
 148                 return 0;
 149         ebp = p->tss.ebp;
 150         stack_page = p->kernel_stack_page;
 151         do {
 152                 if (ebp < stack_page || ebp >= 4092+stack_page)
 153                         return 0;
 154                 eip = *(unsigned long *) (ebp+4);
 155                 if ((void *)eip != sleep_on &&
 156                     (void *)eip != interruptible_sleep_on)
 157                         return eip;
 158                 ebp = *(unsigned long *) ebp;
 159         } while (count++ < 16);
 160         return 0;
 161 }
 162 
 163 static int get_stat(int pid, char * buffer)
     /*  */
 164 {
 165         struct task_struct ** p = get_task(pid);
 166         unsigned long sigignore=0, sigcatch=0, bit=1, wchan;
 167         int i;
 168         char state;
 169 
 170         if (!p || !*p)
 171                 return 0;
 172         if ((*p)->state < 0 || (*p)->state > 5)
 173                 state = '.';
 174         else
 175                 state = "RSDZTD"[(*p)->state];
 176         wchan = get_wchan(*p);
 177         for(i=0; i<32; ++i) {
 178                 switch((int) (*p)->sigaction[i].sa_handler) {
 179                 case 1: sigignore |= bit; break;
 180                 case 0: break;
 181                 default: sigcatch |= bit;
 182                 } bit <<= 1;
 183         }
 184         return sprintf(buffer,"%d (%s) %c %d %d %d %d %d %u %u \
 185 %u %u %u %d %d %d %d %d %d %u %u %d %u %u %u %u %u %u %u %u %d \
 186 %d %d %d %u\n",
 187                 pid,
 188                 (*p)->comm,
 189                 state,
 190                 (*p)->p_pptr->pid,
 191                 (*p)->pgrp,
 192                 (*p)->session,
 193                 (*p)->tty,
 194                 ((*p)->tty == -1) ? -1 :
 195                        tty_table[(*p)->tty]->pgrp,
 196                 (*p)->flags,
 197                 (*p)->min_flt,
 198                 (*p)->cmin_flt,
 199                 (*p)->maj_flt,
 200                 (*p)->cmaj_flt,
 201                 (*p)->utime,
 202                 (*p)->stime,
 203                 (*p)->cutime,
 204                 (*p)->cstime,
 205                 (*p)->counter,  /* this is the kernel priority ---
 206                                    subtract 30 in your user-level program. */
 207                 (*p)->priority, /* this is the nice value ---
 208                                    subtract 15 in your user-level program. */
 209                 (*p)->timeout,
 210                 (*p)->it_real_value,
 211                 (*p)->start_time,
 212                 VSIZE((*p),(*p)->kernel_stack_page),
 213                 (*p)->rss, /* you might want to shift this left 3 */
 214                 (*p)->rlim[RLIMIT_RSS].rlim_cur,
 215                 (*p)->start_code,
 216                 (*p)->end_code,
 217                 (*p)->start_stack,
 218                 KSTK_ESP((*p)->kernel_stack_page),
 219                 KSTK_EIP((*p)->kernel_stack_page),
 220                 (*p)->signal,
 221                 (*p)->blocked,
 222                 sigignore,
 223                 sigcatch,
 224                 wchan);
 225 }
 226 
 227 static int get_statm(int pid, char * buffer)
     /*  */
 228 {
 229         struct task_struct ** p = get_task(pid);
 230         int i, tpag;
 231         int size=0, resident=0, share=0, trs=0, lrs=0, drs=0, dt=0;
 232         unsigned long ptbl, *buf, *pte, *pagedir, map_nr;
 233 
 234         if (!p || !*p)
 235                 return 0;
 236         tpag = (*p)->end_code / PAGE_SIZE;
 237         if ((*p)->state != TASK_ZOMBIE) {
 238           pagedir = (void *)((*p)->tss.cr3 + ((*p)->start_code >> 20));
 239           for (i = 0; i < 0x300; ++i) {
 240             if ((ptbl = pagedir[i]) == 0) {
 241               tpag -= 1024;
 242               continue;
 243             }
 244             buf = (void *)(ptbl & 0xfffff000);
 245             for (pte = buf; pte < (buf + 1024); ++pte) {
 246               if (*pte != 0) {
 247                 ++size;
 248                 if (*pte & 1) {
 249                   ++resident;
 250                   if (tpag > 0)
 251                     ++trs;
 252                   else
 253                     ++drs;
 254                   if (i >= 15 && i < 0x2f0) {
 255                     ++lrs;
 256                     if (*pte & 0x40)
 257                       ++dt;
 258                     else
 259                       --drs;
 260                   }
 261                   map_nr = MAP_NR(*pte);
 262                   if (map_nr < (high_memory / 4096) && mem_map[map_nr] > 1)
 263                     ++share;
 264                 }
 265               }
 266               --tpag;
 267             }
 268           }
 269         }
 270         return sprintf(buffer,"%d %d %d %d %d %d %d\n",
 271                        size, resident, share, trs, lrs, drs, dt);
 272 }
 273 
 274 static int array_read(struct inode * inode, struct file * file,char * buf, int count)
     /*  */
 275 {
 276         char * page;
 277         int length;
 278         int end;
 279         int type, pid;
 280 
 281         if (count < 0)
 282                 return -EINVAL;
 283         page = (char *) get_free_page(GFP_KERNEL);
 284         if (!page)
 285                 return -ENOMEM;
 286         type = inode->i_ino;
 287         pid = type >> 16;
 288         type &= 0x0000ffff;
 289         switch (type) {
 290                 case 2:
 291                         length = get_loadavg(page);
 292                         break;
 293                 case 3:
 294                         length = get_uptime(page);
 295                         break;
 296                 case 4:
 297                         length = get_meminfo(page);
 298                         break;
 299                 case 9:
 300                         length = get_env(pid, page);
 301                         break;
 302                 case 10:
 303                         length = get_arg(pid, page);
 304                         break;
 305                 case 11:
 306                         length = get_stat(pid, page);
 307                         break;
 308                 case 12:
 309                         length = get_statm(pid, page);
 310                         break;
 311                 default:
 312                         free_page((unsigned long) page);
 313                         return -EBADF;
 314         }
 315         if (file->f_pos >= length) {
 316                 free_page((unsigned long) page);
 317                 return 0;
 318         }
 319         if (count + file->f_pos > length)
 320                 count = length - file->f_pos;
 321         end = count + file->f_pos;
 322         memcpy_tofs(buf, page + file->f_pos, count);
 323         free_page((unsigned long) page);
 324         file->f_pos = end;
 325         return count;
 326 }
 327 
 328 static struct file_operations proc_array_operations = {
 329         NULL,           /* array_lseek */
 330         array_read,
 331         NULL,           /* array_write */
 332         NULL,           /* array_readdir */
 333         NULL,           /* array_select */
 334         NULL,           /* array_ioctl */
 335         NULL,           /* mmap */
 336         NULL,           /* no special open code */
 337         NULL            /* no special release code */
 338 };
 339 
 340 struct inode_operations proc_array_inode_operations = {
 341         &proc_array_operations, /* default base directory file-ops */
 342         NULL,                   /* create */
 343         NULL,                   /* lookup */
 344         NULL,                   /* link */
 345         NULL,                   /* unlink */
 346         NULL,                   /* symlink */
 347         NULL,                   /* mkdir */
 348         NULL,                   /* rmdir */
 349         NULL,                   /* mknod */
 350         NULL,                   /* rename */
 351         NULL,                   /* readlink */
 352         NULL,                   /* follow_link */
 353         NULL,                   /* bmap */
 354         NULL,                   /* truncate */
 355         NULL                    /* permission */
 356 };
/* */
root/fs/proc/array.c

DEFINITIONS
