TCP Sockets on V4R5: bind() woes

Hello,

after being busy with other things for quite some time, I'm coming back to getting along with socket programming in C on OS/400. Quite old, though: V4R5. This intentionally.

Half a year ago, I finished a UDP socket based "daemon" which works just great.

https://github.com/PoC-dev/asterisk-translate-clid


But I struggle with getting a simple TCP server to run based on that code. It compiles fine, but emits a

bind(): failed: The value specified for the argument is not correct.

on the bind() call at line 166.

Server code: https://leela.pocnet.net/~poc/txrepd.c

If you want to compile and test-run yourself, you need to add an entry to the TCP services table: GO CFGTCP => 21 => 1. The entry is expected to be "sa-txrep", as to be seen in line 151 of the code.


When I compare the code steps with the TCP Server example code from Chris Hird, I can't see any obvious error.

https://github.com/ChrisHird/OSTOOLS/blob/master/QCSRC/TESTSVR.C


Any hints well appreciated! Thanks!!

:wq! PoC

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