Viewing file:  ioctl.c (2.7 KB) -rw-r--r--
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/*
* linux/fs/ioctl.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#include <linux/mm.h>
#include <linux/smp_lock.h>
#include <linux/file.h>
#include <asm/uaccess.h>
#include <asm/ioctls.h>
static int file_ioctl(struct file *filp,unsigned int cmd,unsigned long arg)
{
int error;
int block;
struct inode * inode = filp->f_dentry->d_inode;
switch (cmd) {
case FIBMAP:
{
struct address_space *mapping = inode->i_mapping;
int res;
/* do we support this mess? */
if (!mapping->a_ops->bmap)
return -EINVAL;
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
if ((error = get_user(block, (int *) arg)) != 0)
return error;
res = mapping->a_ops->bmap(mapping, block);
return put_user(res, (int *) arg);
}
case FIGETBSZ:
if (inode->i_sb == NULL)
return -EBADF;
return put_user(inode->i_sb->s_blocksize, (int *) arg);
case FIONREAD:
return put_user(inode->i_size - filp->f_pos, (int *) arg);
}
if (filp->f_op && filp->f_op->ioctl)
return filp->f_op->ioctl(inode, filp, cmd, arg);
return -ENOTTY;
}
asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
{
struct file * filp;
unsigned int flag;
int on, error = -EBADF;
filp = fget(fd);
if (!filp)
goto out;
error = 0;
lock_kernel();
switch (cmd) {
case FIOCLEX:
set_close_on_exec(fd, 1);
break;
case FIONCLEX:
set_close_on_exec(fd, 0);
break;
case FIONBIO:
if ((error = get_user(on, (int *)arg)) != 0)
break;
flag = O_NONBLOCK;
#ifdef __sparc__
/* SunOS compatibility item. */
if(O_NONBLOCK != O_NDELAY)
flag |= O_NDELAY;
#endif
if (on)
filp->f_flags |= flag;
else
filp->f_flags &= ~flag;
break;
case FIOASYNC:
if ((error = get_user(on, (int *)arg)) != 0)
break;
flag = on ? FASYNC : 0;
/* Did FASYNC state change ? */
if ((flag ^ filp->f_flags) & FASYNC) {
if (filp->f_op && filp->f_op->fasync)
error = filp->f_op->fasync(fd, filp, on);
else error = -ENOTTY;
}
if (error != 0)
break;
if (on)
filp->f_flags |= FASYNC;
else
filp->f_flags &= ~FASYNC;
break;
case FIOQSIZE:
if (S_ISDIR(filp->f_dentry->d_inode->i_mode) ||
S_ISREG(filp->f_dentry->d_inode->i_mode) ||
S_ISLNK(filp->f_dentry->d_inode->i_mode)) {
loff_t res = inode_get_bytes(filp->f_dentry->d_inode);
error = copy_to_user((loff_t *)arg, &res, sizeof(res)) ? -EFAULT : 0;
}
else
error = -ENOTTY;
break;
default:
error = -ENOTTY;
if (S_ISREG(filp->f_dentry->d_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_dentry->d_inode, filp, cmd, arg);
}
unlock_kernel();
fput(filp);
out:
return error;
}
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