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Annotation of linux/fs/ioctl.c, revision 1.1

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

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