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Annotation of linux/fs/ioctl.c, revision 1.1.1.2

1.1.1.2 ! root        1: /*
        !             2:  *  linux/fs/ioctl.c
        !             3:  *
        !             4:  *  (C) 1991  Linus Torvalds
        !             5:  */
        !             6: 
1.1       root        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)
                     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:                panic("unknown device for ioctl");
                     43:        if (!ioctl_table[MAJOR(dev)])
                     44:                return -ENOTTY;
                     45:        return ioctl_table[MAJOR(dev)](dev,cmd,arg);
                     46: }

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