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