[Bug nscd/15139] New: getpwuid_r does not return ERANGE consistently

[tsegismo at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15139

             Bug #: 15139
           Summary: getpwuid_r does not return ERANGE consistently
           Product: glibc
           Version: 2.12
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nscd
        AssignedTo: unassigned@sourceware.org
        ReportedBy: tsegismo@redhat.com
                CC: drepper.fsp@gmail.com
    Classification: Unclassified


Hi,

I have a problem when calling getpwuid_r on a RHEL6 64 bit machine and as it
seems, it does not return ERANGE consistently.

Here are the details.

In my Java project we use a library called Sigar to do things we can't do with
pure Java code. In particular, we use Sigar to determine user name from user
id.

On a 64 bit RHEL6 machine, Sigar fails to find a particular user (hudson,
uid=600, LDAP database). The code involved uses getpwuid_r which returns
ERANGE.

I tried two things:
* I downloaded the library sources [1], changed the value of R_SIZE_MAX to 2048
and rebuilt it; then it worked
* I extracted the original code as a simple program [2] and kept original
R_SIZE_MAX value (1024); it was also able to find the user name (prints
'hudson') 

How come the same piece of code works alone and not through the Sigar library?
May the code in getXXbyYY_r.c behave differently in different contexts?
getpwuid_r does not return ERANGE consistently?

Thanks for your help.

[1] http://tinyurl.com/d2hkgtq (see sigar_user_name_get function)
[2] http://pastebin.com/1bXycrnW

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