share_memory.c

linux编程的简单例子

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdio.h>
#include <stdlib.h>

#define BUFSZ 2048
int main()
{
	int shmid;
	char *shmadd;
	if((shmid=shmget(IPC_PRIVATE,BUFSZ,0666))<0){
		perror("shmget");
		exit(1);
	}
	else
		printf("created shared-memory: %d\n",shmid);
		system("ipcs -m");
	if((shmadd=shmat(shmid,0,0))<(char *)0){
		perror("shmat");
		exit(1);
	}
	else
		printf("attached shared-memory\n");
	system("ipcs -m");
	if((shmdt(shmadd))<0){
		perror("shmdt");
		exit(1);
	}
	else
		printf("deleted shared-memory\n");
	system("ipcs -m");
	exit(0);
}