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/*
* linux/fs/ioctl.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#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/smp.h>
#include <linux/smp_lock.h>
#include <linux/fcntl.h> /* for f_flags values */
#include <asm/uaccess.h>
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;
if ((error = get_user(block, (int *) arg)) != 0)
return error;
block = filp->f_inode->i_op->bmap(filp->f_inode,block);
return put_user(block, (int *) arg);
case FIGETBSZ:
if (filp->f_inode->i_sb == NULL)
return -EBADF;
return put_user(filp->f_inode->i_sb->s_blocksize,
(int *) arg);
case FIONREAD:
return put_user(filp->f_inode->i_size - filp->f_pos,
(int *) arg);
}
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;
unsigned int flag;
int on, error = -EBADF;
lock_kernel();
if (fd >= NR_OPEN || !(filp = current->files->fd[fd]))
goto out;
error = 0;
switch (cmd) {
case FIOCLEX:
FD_SET(fd, ¤t->files->close_on_exec);
break;
case FIONCLEX:
FD_CLR(fd, ¤t->files->close_on_exec);
break;
case FIONBIO:
if ((error = get_user(on, (int *)arg)) != 0)
break;
flag = O_NONBLOCK;
#ifdef __sparc__
/* SunOS compatability item. */
if(O_NONBLOCK != O_NDELAY)
flag |= O_NDELAY;
#endif
if (on)
filp->f_flags |= flag;
else
filp->f_flags &= ~flag;
break;
case FIOASYNC: /* O_SYNC is not yet implemented,
but it's here for completeness. */
if ((error = get_user(on, (int *)arg)) != 0)
break;
if (on)
filp->f_flags |= O_SYNC;
else
filp->f_flags &= ~O_SYNC;
break;
default:
if (filp->f_inode && S_ISREG(filp->f_inode->i_mode))
error = file_ioctl(filp, cmd, arg);
else if (filp->f_op && filp->f_op->ioctl)
error = filp->f_op->ioctl(filp->f_inode, filp, cmd, arg);
else
error = -ENOTTY;
}
out:
unlock_kernel();
return error;
}
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