POSIX Semaphores

The oflag argument is a bit mask that determines whether we are opening an existing semaphore or creating and opening a new semaphore. If oflag is 0, we are accessing an existing semaphore. If O_CREAT is specified in oflag, then a new semaphore is created if one with the given name doesn’t already exist. If oflag specifies both O_CREAT and O_EXCL, and a semaphore with the given name already exists, then sem_open() fails.

所以当， 名称已经重复而且出现了，而且没有设置 O_EXCL 并且设置了 O_CREAT 的时候，那么如何办。

If a blocked sem_wait() call is interrupted by a signal handler, then it fails with the error EINTR, regardless of whether the SA_RESTART flag was used when establishing the signal handler with sigaction().

Linux Programming Interface: Chapter 53

本站所有文章转发 CSDN 将按侵权追究法律责任，其它情况随意。