#include <sys/shm.h>#include <sys/types.h>#include <sys/ipc.h>#include <stdio.h>#include <sys/stat.h>/*VERIFYERR(a, b)是定義宏，當a成立是，它打印失敗信息，否則打印成功信息。*/#define VERIFYERR(a, b)  \	if (a) \	{\		fprintf(stderr, "%s failed.\n", b);  \		return;\	}\	else \		fprintf(stderr, "%s success.\n", b);  void main(){	int shmid;	char *pmat = NULL;	char buf[1024];	int no;	/* 打開信號量 */		VERIFYERR((shmid = shmget(0x1234, 10*1024, 0666|IPC_CREAT)) == -1, "Open(Create) Shm");	/* 映射共享內存，地址存儲與pmat處 */	VERIFYERR((pmat = (char *)shmat(shmid, 0, 0)) == 0, "Link Shm");	/* 輸入更新的內存塊號 */	printf("Please Input No.(0~9):");	scanf("%d", &no);	VERIFYERR(no < 0 || no > 9, "Input No.");	/* 輸入更新的數據 */	printf("Please Input Data:");	memset(buf, 0, sizeof(buf));	scanf("%s", buf);	/* 更新共享內存數據 */;	memcpy(pmat+no*1024, buf, 1024);	/* 釋放共享內存映射 */	shmdt(pmat);}