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47 lines
977 B
47 lines
977 B
2 years ago
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/*
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* linux/fs/ioctl.c
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*
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* (C) 1991 Linus Torvalds
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*/
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#include <string.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <linux/sched.h>
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extern int tty_ioctl(int dev, int cmd, int arg);
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typedef int (*ioctl_ptr)(int dev,int cmd,int arg);
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#define NRDEVS ((sizeof (ioctl_table))/(sizeof (ioctl_ptr)))
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static ioctl_ptr ioctl_table[]={
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NULL, /* nodev */
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NULL, /* /dev/mem */
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NULL, /* /dev/fd */
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NULL, /* /dev/hd */
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tty_ioctl, /* /dev/ttyx */
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tty_ioctl, /* /dev/tty */
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NULL, /* /dev/lp */
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NULL}; /* named pipes */
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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 dev,mode;
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if (fd >= NR_OPEN || !(filp = current->filp[fd]))
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return -EBADF;
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mode=filp->f_inode->i_mode;
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if (!S_ISCHR(mode) && !S_ISBLK(mode))
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return -EINVAL;
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dev = filp->f_inode->i_zone[0];
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if (MAJOR(dev) >= NRDEVS)
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return -ENODEV;
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if (!ioctl_table[MAJOR(dev)])
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return -ENOTTY;
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return ioctl_table[MAJOR(dev)](dev,cmd,arg);
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}
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