=-1); return key = k; } int createShm() { /** * function:创建共享内存 * return:返回共享内存的标识符 * @return */ int sid = shmget(key,SIZE,IPC_CREAT|IPC_EXCL|mode); assert(sid!=-1); return shmid = sid; } int getShm() { /** * function:获取共享内存 * return: 返回共享...
1. Create shared memory int shmget(key_t key, int size, int shmflg); if ((shm_id = shmget (mykey, sizeof (struct sharedbuf), 0600 | IFLAGS)) < 0) perror ("shmget"); 2. Attach shared memory char *buf = shmat (shm_id, 0, 0); 3. Read / Write shared memory sharedbuf->s...
identifierofa previously created shared memorysegment(when shmflg is zero and key does not have the valueIPC_PRIVATE),or to create anewset. shmget接口:作用是申请一个system V标准的共享内存 它有三个参数: (key值我们稍后再谈) 返回值是共享内存的标识符(和 key 不同!!!) size_t size : 表示要...
printf("Create semaphore error!\n"); exit(-1); } /* * Create shared memory */ if ( (fd = shm_open(SHM_NAME, O_CREAT | O_RDWR, 0666)) < 0) { printf("Create shm error!\n"); exit(-1); } if (ftruncate(fd, sizeof (person) * 10) < 0) { printf("Ftruncate shm error!
{cout<<"共享内存创建失败,原因是:"<<strerror(errno)<<endl;exit(2);}returnshmid;}intcreate_shared_memory(key_t key,int size){returnget_or_create_shared_memory(key,size,IPC_CREAT|IPC_EXCL|0666);}intget_shared_memory(key_t key,int size){returnget_or_create_shared_memory(key,size,IPC_...
针对您提供的错误信息 ORA-27125: unable to create shared memory segment linux-x86_64 error: 1: Operation not permitted,这通常指示权限不足或系统配置问题。以下是一些可能的解决步骤: 检查系统权限: 确保Oracle 数据库运行的用户(如 oracle 用户)有足够的权限来创建共享内存段。在某些 Linux 发行版中,可能需...
int get_or_create_shared_memory(key_t key, int size, int flag){int shmid = shmget(key, size, flag);//成功返回共享内存标识符,失败返回-1if(shmid == -1){cout << "共享内存创建失败,原因是:" << strerror(errno) << endl;exit(2);}return shmid;}int create_shared_memory(key_t key,...
File Sealing & memfd_create()文中举到的一个典型使用场景是,如果graphics client把它与graphics compoistor共享的内存交给compoistor去render,compoistor必须保证可以拿到这片内存。这里面的风险是client可能透过ftruncate()把这个memory shrink小,这样compositor就拿不到完整的buffer,会造成crash。所以compositor只愿意接受...
shmid=shmget(key,SHM_SIZE,IPC_CREAT|IPC_EXCL|0666);if(shmid<0){printf("failedtocreatesharememory ");return-1; } addr=shmat(shmid,NULL,0);if(addr<=0){printf("failedtomapsharememory ");return-1; }sprintf(addr,"%s","HelloWorld
{int shmid;char*addr;key_t key=ftok(SHM_PATH,0x6666);shmid=shmget(key,SHM_SIZE,IPC_CREAT|IPC_EXCL|0666);if(shmid<0){printf("failed to create share memory\n");return-1;}addr=shmat(shmid,NULL,0);if(addr<=0){printf("failed to map share memory\n");return-1;}sprintf(addr,"%s"...