patch-2.3.27 linux/fs/proc/fd.c

• Lines: 200
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.26/linux/fs/proc/fd.c
• Orig date: Mon Oct 4 15:49:30 1999

diff -u --recursive --new-file v2.3.26/linux/fs/proc/fd.c linux/fs/proc/fd.c
@@ -1,199 +0,0 @@
-/*
- *  linux/fs/proc/fd.c
- *
- *  Copyright (C) 1991, 1992 Linus Torvalds
- *
- *  proc fd directory handling functions
- *
- *  01-May-98 Edgar Toernig <froese@gmx.de>
- *	Added support for more than 256 fds.
- *	Limit raised to 32768.
- */
-
-#include <linux/errno.h>
-#include <linux/sched.h>
-#include <linux/file.h>
-#include <linux/proc_fs.h>
-#include <linux/stat.h>
-
-#include <asm/uaccess.h>
-
-static int proc_readfd(struct file *, void *, filldir_t);
-static struct dentry *proc_lookupfd(struct inode *, struct dentry *);
-
-static struct file_operations proc_fd_operations = {
-	NULL,			/* lseek - default */
-	NULL,			/* read - bad */
-	NULL,			/* write - bad */
-	proc_readfd,		/* readdir */
-	NULL,			/* poll - default */
-	NULL,			/* ioctl - default */
-	NULL,			/* mmap */
-	NULL,			/* no special open code */
-	NULL,			/* flush */
-	NULL,			/* no special release code */
-	NULL			/* can't fsync */
-};
-
-/*
- * proc directories can do almost nothing..
- */
-struct inode_operations proc_fd_inode_operations = {
-	&proc_fd_operations,	/* default base directory file-ops */
-	NULL,			/* create */
-	proc_lookupfd,		/* lookup */
-	NULL,			/* link */
-	NULL,			/* unlink */
-	NULL,			/* symlink */
-	NULL,			/* mkdir */
-	NULL,			/* rmdir */
-	NULL,			/* mknod */
-	NULL,			/* rename */
-	NULL,			/* readlink */
-	NULL,			/* follow_link */
-	NULL,			/* get_block */
-	NULL,			/* readpage */
-	NULL,			/* writepage */
-	NULL,			/* flushpage */
-	NULL,			/* truncate */
-	proc_permission,	/* permission */
-	NULL,			/* smap */
-	NULL			/* revalidate */
-};
-
-/*
- * NOTE! Normally we'd indicate that a file does not
- * exist by creating a negative dentry and returning
- * a successful return code. However, for this case
- * we do not want to create negative dentries, because
- * the state of the world can change behind our backs.
- *
- * Thus just return -ENOENT instead.
- */
-static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry)
-{
-	unsigned int ino, pid, fd, c;
-	struct task_struct * p;
-	struct file * file;
-	struct inode *inode;
-	const char *name;
-	int len, err;
-
-	err = -ENOENT;
-	ino = dir->i_ino;
-	pid = ino >> 16;
-	ino &= 0x0000ffff;
-
-	if (!pid || ino != PROC_PID_FD)
-		goto out;
-
-	fd = 0;
-	len = dentry->d_name.len;
-	name = dentry->d_name.name;
-	if (len > 1 && *name == '0') goto out;
-	while (len-- > 0) {
-		c = *name - '0';
-		name++;
-		if (c > 9)
-			goto out;
-		fd *= 10;
-		fd += c;
-		if (fd & 0xffff8000)
-			goto out;
-	}
-
-	read_lock(&tasklist_lock);
-	file = NULL;
-	p = find_task_by_pid(pid);
-	if (p && p->files)
-		file = fcheck_task(p, fd);
-	read_unlock(&tasklist_lock);
-
-	/*
-	 *	File handle is invalid if it is out of range, if the process
-	 *	has no files (Zombie) if the file is closed, or if its inode
-	 *	is NULL
-	 */
-
-	if (!file)
-		goto out;
-
-	ino = (pid << 16) + PROC_PID_FD_DIR + fd;
-	inode = proc_get_inode(dir->i_sb, ino, NULL);
-	if (inode) {
-		dentry->d_op = &proc_dentry_operations;
-		d_add(dentry, inode);
-		return NULL;
-	}
-out:
-	return ERR_PTR(err);
-}
-
-#define NUMBUF 10
-
-static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir)
-{
-	struct inode *inode = filp->f_dentry->d_inode;
-	struct task_struct *p, *tmp;
-	unsigned int fd, pid, ino;
-	int retval;
-	char buf[NUMBUF];
-
-	retval = 0;
-	ino = inode->i_ino;
-	pid = ino >> 16;
-	ino &= 0x0000ffff;
-	if (ino != PROC_PID_FD)
-		goto out;
-
-	for (fd = filp->f_pos; fd < 2; fd++, filp->f_pos++) {
-		ino = inode->i_ino;
-		if (fd)
-			ino = (ino & 0xffff0000) | PROC_PID_INO;
-		if (filldir(dirent, "..", fd+1, fd, ino) < 0)
-			goto out;
-	}
-
-	read_lock(&tasklist_lock);
-	p = find_task_by_pid(pid);
-	if (!p)
-		goto out_unlock;
-
-	for (fd -= 2 ; p->files && fd < p->files->max_fds; fd++, filp->f_pos++)
-	{
-		unsigned int i,j;
-
-		if (!fcheck_task(p, fd))
-			continue;
-
-		j = NUMBUF;
-		i = fd;
-		do {
-			j--;
-			buf[j] = '0' + (i % 10);
-			i /= 10;
-		} while (i);
-
-		/* Drop the task lock, as the filldir function may block */
-		read_unlock(&tasklist_lock);
-
-		ino = (pid << 16) + PROC_PID_FD_DIR + fd;
-		if (filldir(dirent, buf+j, NUMBUF-j, fd+2, ino) < 0)
-			goto out;
-
-		read_lock(&tasklist_lock);
-		/*
-		 * filldir() might have slept, so we must
-		 * re-validate "p". This is fast enough due
-		 * to the pidhash
-		 */
-		tmp = find_task_by_pid(pid);
-		if (p != tmp)
-			break;
-	}
-out_unlock:
-	read_unlock(&tasklist_lock);
-
-out:
-	return retval;
-}