Simon Chopin 7399dea960 testlib: add expected argument to fcntl(F_DUPFD) ...

The F_DUPFD and its relative F_DUPFD_CLOEXEC both expect an int argument
as extra argument, being the minimal value for the new FD. This argument
must be within the accepted range (see ulimit -H -n).

This was detected in Ubuntu during testing against the latest glibc,
stracing resulted in:

107244 fcntl(1, F_DUPFD_CLOEXEC, 1847846346272) = -1 EINVAL (Invalid argument)

On the system in question (ppc64el machine running Ubuntu Questing), the
relevant limit is 524288.

For the fix we use 3 as a reasonable floor value, as in the first one
after stderr. It also happens to be the one used in revokefs/main.c.

Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/2121039

2025-08-28 11:21:18 +00:00

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