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/*
* linux/fs/ioctl.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#include <asm/segment.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/termios.h>
#include <linux/fcntl.h> /* for f_flags values */
static int file_ioctl(struct file *filp,unsigned int cmd,unsigned long arg)
{
int error;
int block;
switch (cmd) {
case FIBMAP:
if (filp->f_inode->i_op == NULL)
return -EBADF;
if (filp->f_inode->i_op->bmap == NULL)
return -EINVAL;
error = verify_area(VERIFY_WRITE,(void *) arg,4);
if (error)
return error;
block = get_fs_long((long *) arg);
block = filp->f_inode->i_op->bmap(filp->f_inode,block);
put_fs_long(block,(long *) arg);
return 0;
case FIGETBSZ:
if (filp->f_inode->i_sb == NULL)
return -EBADF;
error = verify_area(VERIFY_WRITE,(void *) arg,4);
if (error)
return error;
put_fs_long(filp->f_inode->i_sb->s_blocksize,
(long *) arg);
return 0;
case FIONREAD:
error = verify_area(VERIFY_WRITE,(void *) arg,sizeof(int));
if (error)
return error;
put_fs_long(filp->f_inode->i_size - filp->f_pos,
(int *) arg);
return 0;
}
if (filp->f_op && filp->f_op->ioctl)
return filp->f_op->ioctl(filp->f_inode, filp, cmd, arg);
return -ENOTTY;
}
asmlinkage int sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
{
struct file * filp;
int on;
if (fd >= NR_OPEN || !(filp = current->files->fd[fd]))
return -EBADF;
switch (cmd) {
case FIOCLEX:
FD_SET(fd, ¤t->files->close_on_exec);
return 0;
case FIONCLEX:
FD_CLR(fd, ¤t->files->close_on_exec);
return 0;
case FIONBIO:
on = verify_area(VERIFY_READ, (unsigned int *)arg,
sizeof(unsigned int));
if(on)
return on;
on = get_user((unsigned int *) arg);
if (on)
filp->f_flags |= O_NONBLOCK;
else
filp->f_flags &= ~O_NONBLOCK;
return 0;
case FIOASYNC: /* O_SYNC is not yet implemented,
but it's here for completeness. */
on = verify_area(VERIFY_READ, (unsigned int *)arg,
sizeof(unsigned int));
if(on)
return on;
on = get_user ((unsigned int *) arg);
if (on)
filp->f_flags |= O_SYNC;
else
filp->f_flags &= ~O_SYNC;
return 0;
default:
if (filp->f_inode && S_ISREG(filp->f_inode->i_mode))
return file_ioctl(filp, cmd, arg);
if (filp->f_op && filp->f_op->ioctl)
return filp->f_op->ioctl(filp->f_inode, filp, cmd, arg);
return -ENOTTY;
}
}
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