root/fs/ioctl.c

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DEFINITIONS

This source file includes following definitions.
  1. sys_ioctl

   1 /*
   2  *  linux/fs/ioctl.c
   3  *
   4  *  (C) 1991  Linus Torvalds
   5  */
   6 
   7 #include <string.h>
   8 #include <errno.h>
   9 #include <sys/stat.h>
  10 
  11 #include <linux/sched.h>
  12 
  13 extern int tty_ioctl(int dev, int cmd, int arg);
  14 
  15 typedef int (*ioctl_ptr)(int dev,int cmd,int arg);
  16 
  17 #define NRDEVS ((sizeof (ioctl_table))/(sizeof (ioctl_ptr)))
  18 
  19 static ioctl_ptr ioctl_table[]={
  20         NULL,           /* nodev */
  21         NULL,           /* /dev/mem */
  22         NULL,           /* /dev/fd */
  23         NULL,           /* /dev/hd */
  24         tty_ioctl,      /* /dev/ttyx */
  25         tty_ioctl,      /* /dev/tty */
  26         NULL,           /* /dev/lp */
  27         NULL};          /* named pipes */
  28         
  29 
  30 int sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
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  31 {       
  32         struct file * filp;
  33         int dev,mode;
  34 
  35         if (fd >= NR_OPEN || !(filp = current->filp[fd]))
  36                 return -EBADF;
  37         mode=filp->f_inode->i_mode;
  38         if (!S_ISCHR(mode) && !S_ISBLK(mode))
  39                 return -EINVAL;
  40         dev = filp->f_inode->i_zone[0];
  41         if (MAJOR(dev) >= NRDEVS)
  42                 return -ENODEV;
  43         if (!ioctl_table[MAJOR(dev)])
  44                 return -ENOTTY;
  45         return ioctl_table[MAJOR(dev)](dev,cmd,arg);
  46 }

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