ADD file via upload

fs/ioctl.c

@@ -0,0 +1,46 @@
+/*
+ *  linux/fs/ioctl.c
+ *
+ *  (C) 1991  Linus Torvalds
+ */
+
+#include <string.h>
+#include <errno.h>
+#include <sys/stat.h>
+
+#include <linux/sched.h>
+
+extern int tty_ioctl(int dev, int cmd, int arg);
+
+typedef int (*ioctl_ptr)(int dev,int cmd,int arg);
+
+#define NRDEVS ((sizeof (ioctl_table))/(sizeof (ioctl_ptr)))
+
+static ioctl_ptr ioctl_table[]={
+	NULL,		/* nodev */
+	NULL,		/* /dev/mem */
+	NULL,		/* /dev/fd */
+	NULL,		/* /dev/hd */
+	tty_ioctl,	/* /dev/ttyx */
+	tty_ioctl,	/* /dev/tty */
+	NULL,		/* /dev/lp */
+	NULL};		/* named pipes */
+	
+
+int sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
+{	
+	struct file * filp;
+	int dev,mode;
+
+	if (fd >= NR_OPEN || !(filp = current->filp[fd]))
+		return -EBADF;
+	mode=filp->f_inode->i_mode;
+	if (!S_ISCHR(mode) && !S_ISBLK(mode))
+		return -EINVAL;
+	dev = filp->f_inode->i_zone[0];
+	if (MAJOR(dev) >= NRDEVS)
+		return -ENODEV;
+	if (!ioctl_table[MAJOR(dev)])
+		return -ENOTTY;
+	return ioctl_table[MAJOR(dev)](dev,cmd,arg);
+}