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READ z/OS Communications Server: IP Sockets Application Programming Interface Guide and Reference SC27-3660-00 |
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The READ call reads the data on socket s. This is the conventional TCP⁄IP read data operation. If a datagram packet is too long to fit in the supplied buffer, datagram sockets discard extra bytes. For stream sockets, data is processed as streams of information
with no boundaries separating the data. For example, if programs
A and B are connected with a stream socket and program A sends 1000
bytes, each call to this function can return any number of bytes,
up to the entire 1000 bytes. The number of bytes returned will be
contained in RETCODE. Therefore, programs using stream sockets should
place this call in a loop that repeats until all data has been received.
Note: See EZACIC05 for a subroutine
that will translate ASCII input data to EBCDIC.
The following requirements apply to this call:
Figure 1 shows an example of READ call instructions. Figure 1. READ call instruction
example
For equivalent PL/I and assembler language declarations, see Converting parameter descriptions. |
Copyright IBM Corporation 1990, 2014
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