fs/proc/root.c

/* */
This source file includes following definitions.
proc_lookuproot
proc_readroot
   1 /*
   2  *  linux/fs/proc/root.c
   3  *
   4  *  Copyright (C) 1991, 1992 Linus Torvalds
   5  *
   6  *  proc root directory handling functions
   7  */
   8 
   9 #include <asm/segment.h>
  10 
  11 #include <linux/errno.h>
  12 #include <linux/sched.h>
  13 #include <linux/proc_fs.h>
  14 #include <linux/stat.h>
  15 #include <linux/config.h>
  16 
  17 static int proc_readroot(struct inode *, struct file *, struct dirent *, int);
  18 static int proc_lookuproot(struct inode *,const char *,int,struct inode **);
  19 
  20 static struct file_operations proc_root_operations = {
  21         NULL,                   /* lseek - default */
  22         NULL,                   /* read - bad */
  23         NULL,                   /* write - bad */
  24         proc_readroot,          /* readdir */
  25         NULL,                   /* select - default */
  26         NULL,                   /* ioctl - default */
  27         NULL,                   /* mmap */
  28         NULL,                   /* no special open code */
  29         NULL,                   /* no special release code */
  30         NULL                    /* no fsync */
  31 };
  32 
  33 /*
  34  * proc directories can do almost nothing..
  35  */
  36 struct inode_operations proc_root_inode_operations = {
  37         &proc_root_operations,  /* default base directory file-ops */
  38         NULL,                   /* create */
  39         proc_lookuproot,        /* lookup */
  40         NULL,                   /* link */
  41         NULL,                   /* unlink */
  42         NULL,                   /* symlink */
  43         NULL,                   /* mkdir */
  44         NULL,                   /* rmdir */
  45         NULL,                   /* mknod */
  46         NULL,                   /* rename */
  47         NULL,                   /* readlink */
  48         NULL,                   /* follow_link */
  49         NULL,                   /* bmap */
  50         NULL,                   /* truncate */
  51         NULL                    /* permission */
  52 };
  53 
  54 static struct proc_dir_entry root_dir[] = {
  55         { PROC_ROOT_INO,        1, "." },
  56         { PROC_ROOT_INO,        2, ".." },
  57         { PROC_LOADAVG,         7, "loadavg" },
  58         { PROC_UPTIME,          6, "uptime" },
  59         { PROC_MEMINFO,         7, "meminfo" },
  60         { PROC_KMSG,            4, "kmsg" },
  61         { PROC_VERSION,         7, "version" },
  62 #ifdef CONFIG_PCI
  63         { PROC_PCI,             3, "pci"  },
  64 #endif
  65         { PROC_CPUINFO,         7, "cpuinfo" },
  66         { PROC_SELF,            4, "self" },    /* will change inode # */
  67         { PROC_NET,             3, "net" },
  68 #ifdef CONFIG_DEBUG_MALLOC
  69         { PROC_MALLOC,          6, "malloc" },
  70 #endif
  71         { PROC_KCORE,           5, "kcore" },
  72         { PROC_MODULES,         7, "modules" },
  73         { PROC_STAT,            4, "stat" },
  74         { PROC_DEVICES,         7, "devices" },
  75         { PROC_INTERRUPTS,      10,"interrupts" },
  76         { PROC_FILESYSTEMS,     11,"filesystems" },
  77         { PROC_KSYMS,           5, "ksyms" },
  78         { PROC_DMA,             3, "dma" },
  79         { PROC_IOPORTS,         7, "ioports"},
  80 #ifdef CONFIG_PROFILE
  81         { PROC_PROFILE,         7, "profile"},
  82 #endif
  83 };
  84 
  85 #define NR_ROOT_DIRENTRY ((sizeof (root_dir))/(sizeof (root_dir[0])))
  86 
  87 static int proc_lookuproot(struct inode * dir,const char * name, int len,
     /*  */
  88         struct inode ** result)
  89 {
  90         unsigned int pid, c;
  91         int i, ino;
  92 
  93         *result = NULL;
  94         if (!dir)
  95                 return -ENOENT;
  96         if (!S_ISDIR(dir->i_mode)) {
  97                 iput(dir);
  98                 return -ENOENT;
  99         }
 100         i = NR_ROOT_DIRENTRY;
 101         while (i-- > 0 && !proc_match(len,name,root_dir+i))
 102                 /* nothing */;
 103         if (i >= 0) {
 104                 ino = root_dir[i].low_ino;
 105                 if (ino == PROC_ROOT_INO) {
 106                         *result = dir;
 107                         return 0;
 108                 }
 109                 if (ino == PROC_SELF) /* self modifying inode ... */
 110                         ino = (current->pid << 16) + 2;
 111         } else {
 112                 pid = 0;
 113                 while (len-- > 0) {
 114                         c = *name - '0';
 115                         name++;
 116                         if (c > 9) {
 117                                 pid = 0;
 118                                 break;
 119                         }
 120                         pid *= 10;
 121                         pid += c;
 122                         if (pid & 0xffff0000) {
 123                                 pid = 0;
 124                                 break;
 125                         }
 126                 }
 127                 for (i = 0 ; i < NR_TASKS ; i++)
 128                         if (task[i] && task[i]->pid == pid)
 129                                 break;
 130                 if (!pid || i >= NR_TASKS) {
 131                         iput(dir);
 132                         return -ENOENT;
 133                 }
 134                 ino = (pid << 16) + 2;
 135         }
 136         if (!(*result = iget(dir->i_sb,ino))) {
 137                 iput(dir);
 138                 return -ENOENT;
 139         }
 140         iput(dir);
 141         return 0;
 142 }
 143 
 144 static int proc_readroot(struct inode * inode, struct file * filp,
     /*  */
 145         struct dirent * dirent, int count)
 146 {
 147         struct task_struct * p;
 148         unsigned int nr,pid;
 149         int i,j;
 150 
 151         if (!inode || !S_ISDIR(inode->i_mode))
 152                 return -EBADF;
 153 repeat:
 154         nr = filp->f_pos;
 155         if (nr < NR_ROOT_DIRENTRY) {
 156                 struct proc_dir_entry * de = root_dir + nr;
 157 
 158                 filp->f_pos++;
 159                 i = de->namelen;
 160                 put_fs_long(de->low_ino, &dirent->d_ino);
 161                 put_fs_word(i,&dirent->d_reclen);
 162                 put_fs_byte(0,i+dirent->d_name);
 163                 j = i;
 164                 while (i--)
 165                         put_fs_byte(de->name[i], i+dirent->d_name);
 166                 return j;
 167         }
 168         nr -= NR_ROOT_DIRENTRY;
 169         if (nr >= NR_TASKS)
 170                 return 0;
 171         filp->f_pos++;
 172         p = task[nr];
 173         if (!p || !(pid = p->pid))
 174                 goto repeat;
 175         if (pid & 0xffff0000)
 176                 goto repeat;
 177         j = 10;
 178         i = 1;
 179         while (pid >= j) {
 180                 j *= 10;
 181                 i++;
 182         }
 183         j = i;
 184         put_fs_long((pid << 16)+2, &dirent->d_ino);
 185         put_fs_word(i, &dirent->d_reclen);
 186         put_fs_byte(0, i+dirent->d_name);
 187         while (i--) {
 188                 put_fs_byte('0'+(pid % 10), i+dirent->d_name);
 189                 pid /= 10;
 190         }
 191         return j;
 192 }
/* */
root/fs/proc/root.c

DEFINITIONS
