base.c




/*
* linux/fs/proc/base.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*
* proc base directory handling functions
*/

#include <asm/segment.h>

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>

static struct file_operations proc_base_operations = {
NULL, /* lseek - default */
NULL, /* read - bad */
NULL, /* write - bad */
proc_readdir, /* readdir */
NULL, /* select - default */
NULL, /* ioctl - default */
NULL, /* mmap */
NULL, /* no special open code */
NULL, /* no special release code */
NULL /* can't fsync */
};

/*
* proc directories can do almost nothing..
*/
static struct inode_operations proc_base_inode_operations = {
&proc_base_operations, /* default base directory file-ops */
NULL, /* create */
proc_lookup, /* lookup */
NULL, /* link */
NULL, /* unlink */
NULL, /* symlink */
NULL, /* mkdir */
NULL, /* rmdir */
NULL, /* mknod */
NULL, /* rename */
NULL, /* readlink */
NULL, /* follow_link */
NULL, /* readpage */
NULL, /* writepage */
NULL, /* bmap */
NULL, /* truncate */
NULL /* permission */
};

static void proc_pid_fill_inode(struct inode * inode)
{
struct task_struct * p;
int pid = inode->i_ino >> 16;
int ino = inode->i_ino & 0xffff;

for_each_task(p) {
if (p->pid == pid) {
if (p->dumpable || ino == PROC_PID_INO) {
inode->i_uid = p->euid;
inode->i_gid = p->gid;
}
return;
}
}
}

/*
* This is really a pseudo-entry, and only links
* backwards to the parent with no link from the
* root directory to this. This way we can have just
* one entry for every /proc/<pid>/ directory.
*/
struct proc_dir_entry proc_pid = {
PROC_PID_INO, 5, "<pid>",
S_IFDIR | S_IRUGO | S_IXUGO, 2, 0, 0,
0, &proc_base_inode_operations,
NULL, proc_pid_fill_inode,
NULL, &proc_root, NULL
};

void proc_base_init(void)
{
proc_register(&proc_pid, &(struct proc_dir_entry) {
PROC_PID_STATUS, 6, "status",
S_IFREG | S_IRUGO, 1, 0, 0,
0, &proc_array_inode_operations,
NULL, proc_pid_fill_inode,
});
proc_register(&proc_pid, &(struct proc_dir_entry) {
PROC_PID_MEM, 3, "mem",
S_IFREG | S_IRUSR | S_IWUSR, 1, 0, 0,
0, &proc_mem_inode_operations,
NULL, proc_pid_fill_inode,
});
proc_register(&proc_pid, &(struct proc_dir_entry) {
PROC_PID_CWD, 3, "cwd",
S_IFLNK | S_IRWXU, 1, 0, 0,
0, &proc_link_inode_operations,
NULL, proc_pid_fill_inode,
});
proc_register(&proc_pid, &(struct proc_dir_entry) {
PROC_PID_ROOT, 4, "root",
S_IFLNK | S_IRWXU, 1, 0, 0,
0, &proc_link_inode_operations,
NULL, proc_pid_fill_inode,
});
proc_register(&proc_pid, &(struct proc_dir_entry) {
PROC_PID_EXE, 3, "exe",
S_IFLNK | S_IRWXU, 1, 0, 0,
0, &proc_link_inode_operations,
NULL, proc_pid_fill_inode,
});
proc_register(&proc_pid, &(struct proc_dir_entry) {
PROC_PID_FD, 2, "fd",
S_IFDIR | S_IRUSR | S_IXUSR, 1, 0, 0,
0, &proc_fd_inode_operations,
NULL, proc_pid_fill_inode,
});
proc_register(&proc_pid, &(struct proc_dir_entry) {
PROC_PID_ENVIRON, 7, "environ",
S_IFREG | S_IRUSR, 1, 0, 0,
0, &proc_array_inode_operations,
NULL, proc_pid_fill_inode,
});
proc_register(&proc_pid, &(struct proc_dir_entry) {
PROC_PID_CMDLINE, 7, "cmdline",
S_IFREG | S_IRUGO, 1, 0, 0,
0, &proc_array_inode_operations,
NULL, proc_pid_fill_inode,
});
proc_register(&proc_pid, &(struct proc_dir_entry) {
PROC_PID_STAT, 4, "stat",
S_IFREG | S_IRUGO, 1, 0, 0,
0, &proc_array_inode_operations,
NULL, proc_pid_fill_inode,
});
proc_register(&proc_pid, &(struct proc_dir_entry) {
PROC_PID_STATM, 5, "statm",
S_IFREG | S_IRUGO, 1, 0, 0,
0, &proc_array_inode_operations,
NULL, proc_pid_fill_inode,
});
proc_register(&proc_pid, &(struct proc_dir_entry) {
PROC_PID_MAPS, 4, "maps",
S_IFIFO | S_IRUGO, 1, 0, 0,
0, &proc_arraylong_inode_operations,
NULL, proc_pid_fill_inode,
});
};