if shmFd == -1 { perror("Failed to open shared memory") } else { print("Shared memory opened successfully with descriptor \(shmFd)") } 方法二:使用Darwin模块 在macOS上,你可以导入Darwin模块来访问POSIX API: 代码语言:txt 复制 import Darwin let shmName = "/my_shm" let flags ...
int shm_fd = shm_open("/my_shm", O_CREAT | O_RDWR, 0666); if (shm_fd == -1) { // 创建或打开共享内存对象失败 perror("shm_open failed"); } 常见错误及处理: EACCES:权限不足,无法创建或打开共享内存对象。 EEXIST:当 O_CREAT 和O_EXCL 标志被设置,且共享内存对象已存在时。 ENOENT:...
1、首先要检查打印机是否处于联机状态，如果打印机没有联机是无法进行工作的，检查打印机与电脑之间的连线...
} ftruncate(shm_id,100);/*第二步:调整共享内存区大小,shmid问shm_open的返回值*/sem=sem_open(argv[1],O_CREAT,0644,0);/*创建信号量*/if(sem==SEM_FAILED) { printf("open semaphore error.errno=%d,desc=%s.\n", errno, strerror(errno));return-1; } ptr=mmap(NULL,100,PROT_READ|PROT_W...
shm_fd,0);if(p ==MAP_FAILED) { perror("mmap"); exit(1); } fd= open("/bin/ls", O_RDONLY,0);if(fd == -1) { perror("openls"); exit(1); } rc=read(fd, p, st.st_size);if(rc == -1) { perror("read");
perror("shm failed: "); goto _OUT; } //调整确定文件共享内存的空间 ret =ftruncate(fd, FILE_SIZE); if(-1 == ret) { perror("ftruncate faile: "); goto _OUT; } //映射目标文件的存储区 add_r = mmap(NULL, FILE_SIZE, PROT_READ, MAP_SHARED, fd, SEEK_SET); ...
A threadsafe iox_shm_open and iox_shm_unlink function A detailed error message which states why the shm segment creation failed.elfenpiff self-assigned this Mar 10, 2022 elfenpiff changed the title More detailed error message on windows shm failures Windows shm_open must be threadsafe Mar 10...
Squid doesn't run anymore. squid -z results in: FATAL: Ipc::Mem::Segment::create failed to ftruncate(/squid-cf__metadata.shm): (22) Invalid argument Trying to start squid before running squid -z results in the following error in /usr/loc...
【摘要】 shm_open 是一个用于在 POSIX(可移植操作系统接口)系统中创建和打开共享内存对象的系统调用。共享内存是一种进程间通信(IPC)机制,允许多个进程访问同一个内存段,从而实现数据的快速交换和同步。共享内存允许多个进程共享同一个内存段。shm_open(const char *name, int oflag, mode_t mode); 创建或打开...
0 || ret != (strlen(buffer)+1)) { perror("write failed"); exit(1); ...