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ioctl.c

Version: ~ [ 2.4.0 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *  linux/fs/ioctl.c
  3  *
  4  *  Copyright (C) 1991, 1992  Linus Torvalds
  5  */
  6 
  7 #include <linux/mm.h>
  8 #include <linux/smp_lock.h>
  9 #include <linux/file.h>
 10 
 11 #include <asm/uaccess.h>
 12 
 13 static int file_ioctl(struct file *filp,unsigned int cmd,unsigned long arg)
 14 {
 15         int error;
 16         int block;
 17         struct inode * inode = filp->f_dentry->d_inode;
 18 
 19         switch (cmd) {
 20                 case FIBMAP:
 21                 {
 22                         struct address_space *mapping = inode->i_mapping;
 23                         int res;
 24                         /* do we support this mess? */
 25                         if (!mapping->a_ops->bmap)
 26                                 return -EINVAL;
 27                         if (!capable(CAP_SYS_RAWIO))
 28                                 return -EPERM;
 29                         if ((error = get_user(block, (int *) arg)) != 0)
 30                                 return error;
 31 
 32                         res = mapping->a_ops->bmap(mapping, block);
 33                         return put_user(res, (int *) arg);
 34                 }
 35                 case FIGETBSZ:
 36                         if (inode->i_sb == NULL)
 37                                 return -EBADF;
 38                         return put_user(inode->i_sb->s_blocksize, (int *) arg);
 39                 case FIONREAD:
 40                         return put_user(inode->i_size - filp->f_pos, (int *) arg);
 41         }
 42         if (filp->f_op && filp->f_op->ioctl)
 43                 return filp->f_op->ioctl(inode, filp, cmd, arg);
 44         return -ENOTTY;
 45 }
 46 
 47 
 48 asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
 49 {       
 50         struct file * filp;
 51         unsigned int flag;
 52         int on, error = -EBADF;
 53 
 54         filp = fget(fd);
 55         if (!filp)
 56                 goto out;
 57         error = 0;
 58         lock_kernel();
 59         switch (cmd) {
 60                 case FIOCLEX:
 61                         set_close_on_exec(fd, 1);
 62                         break;
 63 
 64                 case FIONCLEX:
 65                         set_close_on_exec(fd, 0);
 66                         break;
 67 
 68                 case FIONBIO:
 69                         if ((error = get_user(on, (int *)arg)) != 0)
 70                                 break;
 71                         flag = O_NONBLOCK;
 72 #ifdef __sparc__
 73                         /* SunOS compatibility item. */
 74                         if(O_NONBLOCK != O_NDELAY)
 75                                 flag |= O_NDELAY;
 76 #endif
 77                         if (on)
 78                                 filp->f_flags |= flag;
 79                         else
 80                                 filp->f_flags &= ~flag;
 81                         break;
 82 
 83                 case FIOASYNC:
 84                         if ((error = get_user(on, (int *)arg)) != 0)
 85                                 break;
 86                         flag = on ? FASYNC : 0;
 87 
 88                         /* Did FASYNC state change ? */
 89                         if ((flag ^ filp->f_flags) & FASYNC) {
 90                                 if (filp->f_op && filp->f_op->fasync)
 91                                         error = filp->f_op->fasync(fd, filp, on);
 92                                 else error = -ENOTTY;
 93                         }
 94                         if (error != 0)
 95                                 break;
 96 
 97                         if (on)
 98                                 filp->f_flags |= FASYNC;
 99                         else
100                                 filp->f_flags &= ~FASYNC;
101                         break;
102 
103                 default:
104                         error = -ENOTTY;
105                         if (S_ISREG(filp->f_dentry->d_inode->i_mode))
106                                 error = file_ioctl(filp, cmd, arg);
107                         else if (filp->f_op && filp->f_op->ioctl)
108                                 error = filp->f_op->ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
109         }
110         unlock_kernel();
111         fput(filp);
112 
113 out:
114         return error;
115 }
116

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Linux Cross Reference Linux/fs/ioctl.c

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Linux/fs/ioctl.c