e5656d43dc
Now that the SPDX tag is in all tty files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Jiri Slaby <jslaby@suse.com> Cc: James Hogan <jhogan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
69 lines
1.3 KiB
C
69 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/tty.h>
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#include <linux/module.h>
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/*
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* n_null.c - Null line discipline used in the failure path
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*
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* Copyright (C) Intel 2017
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*/
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static int n_null_open(struct tty_struct *tty)
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{
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return 0;
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}
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static void n_null_close(struct tty_struct *tty)
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{
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}
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static ssize_t n_null_read(struct tty_struct *tty, struct file *file,
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unsigned char __user * buf, size_t nr)
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{
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return -EOPNOTSUPP;
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}
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static ssize_t n_null_write(struct tty_struct *tty, struct file *file,
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const unsigned char *buf, size_t nr)
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{
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return -EOPNOTSUPP;
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}
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static void n_null_receivebuf(struct tty_struct *tty,
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const unsigned char *cp, char *fp,
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int cnt)
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{
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}
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static struct tty_ldisc_ops null_ldisc = {
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.owner = THIS_MODULE,
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.magic = TTY_LDISC_MAGIC,
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.name = "n_null",
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.open = n_null_open,
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.close = n_null_close,
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.read = n_null_read,
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.write = n_null_write,
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.receive_buf = n_null_receivebuf
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};
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static int __init n_null_init(void)
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{
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BUG_ON(tty_register_ldisc(N_NULL, &null_ldisc));
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return 0;
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}
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static void __exit n_null_exit(void)
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{
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tty_unregister_ldisc(N_NULL);
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}
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module_init(n_null_init);
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module_exit(n_null_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Alan Cox");
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MODULE_ALIAS_LDISC(N_NULL);
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MODULE_DESCRIPTION("Null ldisc driver");
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