ldd_ch2_HelloModule

kernelwind

最简单的模块例子，编写代码：
/root/ldd/hello/hello.c
/root/ldd/hello/Makefile

#make -C /usr/src/linux M=/root/ldd/hello/ modules

附代码:
/* hello.c */
#include   /* headfile which any module will need */
#include     /* related Macro of init&exit */
MODULE_LICENSE("Dual BSD/GPL");

static int hello_init(void)
{
printk("hello module init\n");
return 0;
}

static void hello_exit(void)
{
printk("hello module exit\n");
}

module_init(hello_init);
module_exit(hello_exit);
/* Makefile */
obj-m := hello.o

或更通用的Makefile

/* Makefile */
# If KERNELRELEASE is defined, we've been invoked from the
# kernel build system and can use its language.
ifneq ($(KERNELRELEASE),)
    obj-m := hello.o

# Otherwise we were called directly from the command
# line; invoke the kernel build system.
else
    KERNELDIR ?= /lib/modules/$(shell uname -r)/build
    PWD  := $(shell pwd)

default:
    $(MAKE) -C $(KERNELDIR) M=$(PWD) modules

endif


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