From 832abd818e6f5b988e3ae64ce422c3cf2fc5d4e7 Mon Sep 17 00:00:00 2001 From: Thadeu Lima de Souza Cascardo Date: Tue, 18 May 2010 16:12:14 -0400 Subject: [PATCH] Simple hello world module. --- Makefile | 1 + hello.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 62 insertions(+) create mode 100644 Makefile create mode 100644 hello.c diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..d4757ee --- /dev/null +++ b/Makefile @@ -0,0 +1 @@ +obj-m := hello.o diff --git a/hello.c b/hello.c new file mode 100644 index 0000000..8a5a20b --- /dev/null +++ b/hello.c @@ -0,0 +1,61 @@ +/* + * Copyright (C) 2010 Thadeu Lima de Souza Cascardo + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + + +#include +#include +#include +#include +#include + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Thadeu Lima de Souza Cascardo "); +MODULE_DESCRIPTION("Hello, world"); + +static int size = 1; +module_param_named(size, size, int, S_IRUGO | S_IWUSR); + +struct hello { + int times; + char greeting[0]; +}; + +static struct hello *hello; + +static char default_greeting[] = "Hello, world!\n"; + +static int hello_init(void) +{ + hello = kmalloc(sizeof(*hello) + sizeof(default_greeting), GFP_KERNEL); + if (!hello) + return -ENOMEM; + memcpy(hello->greeting, default_greeting, sizeof(default_greeting)); + printk("%s\n", hello->greeting); + printk("%p %p %p\n", hello, hello->greeting, + container_of(&hello->greeting, struct hello, greeting)); + printk("size %d\n", ARRAY_SIZE(default_greeting)); + return 0; +} + +static __exit void hello_exit(void) +{ + kfree(hello); +} + +module_init(hello_init); +module_exit(hello_exit); -- 2.20.1