shm_read.c

关于进程间通信的代码集锦

#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/types.h>
#include <unistd.h>

typedef struct{
	char name[4];
	int age;
}people;

int main(int argc,char** argv)
{
	int shm_id,i;
	key_t key;
	people* p_map;
	char* name="/dev/shm/myshm2";
	key=ftok(name,0);
	if(key==-1)
	{
		perror("ftok error");
	}
	shm_id=shmget(key,4096,IPC_CREAT);
	if(shm_id==-1)
	{
		perror("shmget error");
		return;
	}
	p_map=(people*)shmat(shm_id,NULL,0);
	for(i=0;i<10;i++)
	{
		printf("name:%s\n",(*(p_map+i)).name);
		printf("age:%d\n",(*(p_map+i)).age);
	}
	if(shmdt(p_map)==-1)
	{
		perror("detach error.");
	}

	return 0;
}