=-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...
AI代码解释 intget_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);}returnshmid;}intcreate_shared_memory(key_t key,int size){retur...
memfd_create memfd_create() creates an anonymous file and returns a file descriptor that refers to it. The file behaves like a regular file, and so can be modified, truncated, memory-mapped, and so on. However, unlike a regular file, it lives in RAM and has a volatile backing storage....
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!!!) ...
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...
{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"...
27125, 00000, "unable to create sharedmemory segment" // *Cause: shmget() call failed // *Action: contact Oracle support 解决方法如下: [root@rac2 ~]# id oracle uid=500(oracle) gid=501(oinstall)groups=501(oinstall),502(dba),503(asmadmin),504(oper) ...
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