map_normalfileread.c

关于进程间通信的代码集锦2

#include <sys/mman.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
typedef struct{
	char name[4];
	int age;
}people;

int main(int argc,char** argv)
{
	int fd,i;
	people* p_map;	
	fd=open(argv[1],O_CREAT|O_RDWR,00777);
	p_map=(people*)mmap(NULL,sizeof(people)*10,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0);
	for(i=0;i<10;i++)
	{
		printf("name: %s age %d;\n",(*(p_map+i)).name,(*(p_map+i)).age);
	}
	munmap(p_map,sizeof(people)*10);

	return 0;
}