Most of the programs in previous chapters are based on a model of I/O in which read and write operations are blocking. These programs obtain their input from a single source, either the standard input stream or a disk file, and they send their output to a single source, either the standard output stream or a disk file. The exceptions are the programs in Chapters 12, 13, and 14, some of which open message queues and pipes in nonblocking mode, but only because this is needed to keep these facilities from closing prematurely or to prevent deadlock or some other unwanted behavior.
When a process issues a blocking read, ...
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