setresgid fails for GID > 65535 on s390

[Martin Schwidefsky]

> On a local s390 (32-bit) system with glibc-2.2.5-233 and 2.4.21-266
> kernel, setresgid() fails for users with gid > 65535. Replacing the
> glibc-2.2 with glibc-2.3 helps.  Looking through the glibc code, it
> seemed like glibc is supporting a 16-bit setresgid(). The problem does
> not occur on x86.  man page of setresgid() mentions that the prototype
> of setresgid() is not available in glibc-2.2 but is available in higher
> versions (2.3).  Can anybody suggest on how we can make setresgid() work
> for large gid's ( gid > 65535 ) on glibc-2.2.5-233, or how the changes
> in glibc-2.3 can be backported to glibc-2.2 for setresgid() call.

The glibc-2-2-5 branch in the CVS is fine. It's the distributions
glibc package that has it wrong.

blue skies,
   Martin

Martin Schwidefsky
Linux for zSeries Development & Services
IBM Deutschland Entwicklung GmbH