Semantic issues are those issues which arise when trying to implement some aspects of IEEE 1003.1-1990 in an environment for which it was not designed, e.g., a network environment. IEEE 1003.1-1990 applies only to local file systems. Some capabilities cannot be implemented within the context of IEEE 1003.1-1990 in a network environment. Semantic issues include sending a SIGPIPE signal when using a remote FIFO (see sec. 2.1), guaranteeing that data written by one process will not be interleaved with data written by another process (see sec. 2.2), and returning the value of l_pid by fcntl() (see sec. 2.3).