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