什么时候检查EINTR并重复函数调用？

参见sigaction：http
:
//pubs.opengroup.org/onlinepubs/009695399/functions/sigaction.html

SA_RESTART  This flag affects the behavior of interruptible functions; that is, those   specified to fail with errno set to EINTR. If set, and a function specified   as interruptible is interrupted by this signal, the function shall restart   and shall not fail with EINTR unless otherwise specified. If the flag is not   set, interruptible functions interrupted by this signal shall fail with errno   set to EINTR.

默认情况下，您具有SA_RESTART行为，因此，如果您不使用信号，则不必担心EINTR。