Open System Services System Calls Reference Manual (G06.29+, H06.08+, J06.03+)

System Functions (r) read(2)
The use of this function with the POSIX User Thread Model library conforms to industry stan-
dards as follows:
• IEEE Std 1003.1-2004, POSIX System Application Program Interface
• When a signal arrives during a call to a thread-aware read() function, the thread-aware
read() retries the I/O operation instead of returning the errno value [EINTR] with the
following exception. If the thread-aware fork() function is called by a signal handler
that is running on a thread performing a thread-aware read() call, the thread-aware
read() call in the child process returns [EINTR] to the application.
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