test_write.c

内核空间地址向用户空间地址的映射实例

#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int main(int argc,char **argv)
{
	int fd = 0;
	int pid = 0;
	char buffer[20] = {'\0'};
	char write_buffer[20] = {'\0'};

	strcpy(write_buffer,"zhanglinbao");

	fd = open("/dev/hello",O_RDWR | O_CREAT | O_TRUNC);
	//fd = open("/dev/hello",O_RDONLY);
	printf("fd=%d\n",fd);
	if(fd < 0) {
		perror("/dev/hello");
		return -1;
	}

	write(fd,write_buffer,sizeof(write_buffer)-1);

	close(fd);

	return 0;
}