add configure script argument to workaround broken cuserid() function

[shanedsnyder]

In GitLab by @shanedsnyder on Sep 24, 2015, 16:25

We need a configure-time argument to work around cuserid() segmentation faults by replacing that logic with getenv("LOGNAME"). I don't see a way to handle this at run time.

[shanedsnyder]

In GitLab by @shanedsnyder on Sep 24, 2015, 16:25

Remember to document this in the Cray installation recipe as well.

[shanedsnyder]

In GitLab by @shanedsnyder on Sep 24, 2015, 16:25

The first step is to update the runtime logic for determining user id, so that it tries each of cuserid(), getenv("LOGNAME"), and finally sprintf(..., getuid()). Testing on surveyor (BG/P) and VEAS (BG/Q) confirm that the LOGNAME environment variable is not set by default on those systems, so they will fall back directly to getuid() if cuserid() does not work.

The --disable-cuserid configure argument will activate ifdef wrappers around the cuserid() portion of the code.

[shanedsnyder]

In GitLab by @shanedsnyder on Sep 24, 2015, 16:25

This is complete in svn now and tested on Beagle. The documentation for darshan-runtime has been updated accordingly.