驱动编译错误 variable `globalvar_fops' has initializer but incomplete type
#include <linux/module.h>
#include <linux/init.h>
#include </usr/src/linux-2.4.20-8/include/linux/fs.h>
#include <asm/uaccess.h>
#include <linux/kernel.h>
#include <errno.h>
#ifndef __KERNEL__
#define __KERNEL__
#endif
#ifndef MODULE
#define MODULE
#endif
MODULE_LICENSE ( "GPL ");
#define MAJOR_NUM 254
static ssize_tglobalvar_read(struct file *, char *, size_t , loff_t * );
static ssize_t globalvar_write(struct file *, const char *, size_t , loff_t *);
static int global_var=0;
static ssize_t globalvar_read(struct file *filp, char * buf, size_t len, loff_t *off)
{
if(copy_to_user(buf, &global_var, sizeof(int)))
{
return -EFAULT;
}
return sizeof(int);
}
static ssize_t globalvar_write(struct file *filp, const char *buf, size_t len, loff_t *off)
{
if(copy_from_user(&global_var, buf,sizeof(int)))
{
return -EFAULT;
}
return sizeof(int);
}
static struct file_operations globalvar_fops =
{
read: globalvar_read,
write: globalvar_write,
} ;
static int __init globalvar_init(void)
{
intret;
ret = register_chrdev(MAJOR_NUM, "glovalvar ", &globalvar_fops);
if(ret)
{
printk( "global register failure ");
}
else
{
printk( "global register sucess ");
}
return ret;
}
static int __exit globalvar_exit(void)
{
intret;
ret = unregister_chrdev(MAJOR_NUM, "globalvar ");
if(ret)
{
printk( "gloval unregister failure ");
}
else
{
printk( "global unregistr success ");
}
return ret;
}
module_init(globalvar_init);
module_exit(globalvar_exit);
编译之
[root@localhost xu]# gcc -D_KERNEL_ -DMODULE -DLINUX -I /usr/src/linux-2.4.20-8/include -c -o globalvar.o globalvar.c
............
globalvar.c: At top level:
globalvar.c:23: warning: `struct file ' declared inside parameter list
globalvar.c:23: warning: its scope is only this definition or declaration, which is probably not what you want
globalvar.c:24: warning: `struct file ' declared inside parameter list
globalvar.c:30: warning: `struct file ' declared inside parameter list
globalvar.c:31: conflicting types for `globalvar_read '
globalvar.c:23: previous declaration of `globalvar_read '
globalvar.c:41: warning: `struct file ' declared inside parameter list
globalvar.c:42: conflicting types for `globalvar_write '
globalvar.c:24: previous declaration of `globalvar_write '
globalvar.c:51: variable `globalvar_fops ' has initializer but incomplete type
globalvar.c:53: unknown field `read ' specified in initializer
globalvar.c:53: warning: excess elements in struct initializer
globalvar.c:53: warning: (near initialization for `globalvar_fops ')
globalvar.c:54: unknown field `write ' specified in initializer
globalvar.c:54: warning: excess elements in struct initializer
globalvar.c:54: warning: (near initialization for `globalvar_fops ')
globalvar.c: In function `__cleanup_module_inline ':
globalvar.c:96: warning: return from incompatible pointer type
globalvar.c: At top level:
globalvar.c:51: storage size of `globalvar_fops ' isn 't known
我是在 red hat 9 下编译的 usr/src/linux-2.4.20-8/include 是安装时自带的源码目录 gcc是red hat 9 自带的 gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
将#include <linux/fs.h> 改为
#include </usr/src/linux-2.4.20-8/include/linux/fs.h>
也不对
总是出现这样的错误：
variable `globalvar_fops ' has initializer but incomplete type
storage size of `globalvar_fops ' isn 't known
这困扰我几天了，刚学习驱动就这样困难，请高手指点！！非常感谢！
[解决办法]
gcc -D _KERNEL_ -DMODULE -DLINUX -I /usr/src/linux-2.4.20-8/include -c -o globalvar.o globalvar.c
