We have a program, written in C, that uses RPC to communicate with another program (also written in C) on the same Linux server (in some production setups, the second C program would on another machine, therefore RPC instead of IPC).
When called from other C programs, CRON or the command line, it works as expected and has been doing so for many years, so it's safe to say it generally works.
The same program, called from a Groovy script, fails, apparently with network problems.
In the C program,
svc_register(xprt, prognum, versnum, dispatch, protocol)
[ "myprogram", "someoption", "someprogram" ].execute()
Apparently, calling RPC based C-programs from Groovy does indeed work.
The problem could be narrowed down to the issue that "(int)sysconf (_SC_OPEN_MAX)", which is used to determine the number of fds in svc_fdset (a structure used to get replies from rpc-requests) does fail in case of being used by a C program called from Groovy.