int main(int argc,char *argv[])
{
int shmid,size;
if(argc != 3) return 0;
shmid = atoi(argv[1]);
if(strcmp(argv[2],"v") == 0) //查询共享内存
{
StatShm(shmid);
}
else if(strcmp(argv[2],"d") == 0) //删除共享内存
{
VERIFYERR(shmctl(shmid,IPC_RMID,NULL) < 0, "Delete Shm");
}
else //创建共享内存
{
size = atoi(argv[2]);
VERIFYERR(shmget(shmid,size,0666|IPC_CREAT|IPC_EXCL) < 0,"Create Shm");
}
return 0;
}
void main()
{
int shmid;
char *pmat = NULL;
char buf[1024];
int no;
/* 打开信号量 */
VERIFYERR((shmid = shmget(0x1234, 10*1024, 0666|IPC_CREAT)) == -1, "Open(Create) Shm");
/* 映射共享内存，地址存储与pmat处 */
VERIFYERR((pmat = (char *)shmat(shmid, 0, 0)) == 0, "Link Shm");
/* 输入更新的内存块号 */
printf("Please Input No.(0~9):");
scanf("%d", &no);
VERIFYERR(no < 0 || no > 9, "Input No.");
/* 输入更新的数据 */
printf("Please Input Data:");
memset(buf, 0, sizeof(buf));
scanf("%s", buf);
/* 更新共享内存数据 */;
memcpy(pmat+no*1024, buf, 1024);
/* 释放共享内存映射 */
shmdt(pmat);
}
//向共享内存中指定位置写入数据
int main(int argc, const char * argv[])
{
int shmid, no;
char * pmat = NULL, buf[1024];
/*打开共享内存*/
VERIFYERR((shmid = shmget(0x1234, 10 * 1024, 0666 | IPC_CREAT)) == -1, "Open shm");
/*映射共享内存， 地址存储在pmat处*/
VERIFYERR((pmat = (char *)shmat(shmid, 0, 0)) == 0, "Link shm");
/*输入更新的内存块*/
printf("Please Input No.(0-9):");
scanf("%d", &no);
VERIFYERR(no < 0 || no > 9, "Input No.");
/*输入更新的数据*/
printf("please Input Data:");
memset(buf, 0, sizeof(buf));
scanf("%s", buf);
/*更新共享内存数据*/
memcpy(pmat + no * 1024, buf, 1024);
printf("%s", pmat + no*1024);
/*释放共享内存映射*/
shmdt(pmat);
return 0;
}