t2.c

linux源代码

#include <stdio.h>
#include <fcntl.h>
#include <sys/mman.h>

#define NAMESIZE 32

struct score_st {
	char name[NAMESIZE];
	int math;
	int chinese;
};

int
main()
{
	int i;
	int fd;
	struct score_st *score;

	fd=open("/tmp/scores", O_RDONLY);
	if (fd==-1) {
		perror("open()");
		exit(1);
	}

	score=mmap(NULL, sizeof(struct score_st)*32, PROT_READ, MAP_PRIVATE, fd, 0);
	if (score==MAP_FAILED) {
		perror("mmap()");
		exit(1);
	}

	close(fd);

	for (i=0;i<32;++i) {
		printf("Name: %s\tMath=%d\tChinese=%d\n", score[i].name, score[i].math, score[i].chinese);
	}

	mummap(score, sizeof(struct score_st)*32);

	exit(0);
}