This chapter applies to the signal-handling version of the
message passing library. Any AIX function that is interruptible by a signal may not behave as expected because the message passing subsystem uses timer signals to manage message traffic. For example, the user's program may not sleep for the full time, but may instead return quickly with an error code of EINTR. In this case, the sleep was interrupted by a signal. This example applies to the select system call as well.