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[Bug libc/6724] New: Format incompatiblity between 31/64 bit utmp


The utmp structure contains long type fields what makes it
incompatible between 32 and 64 bit systems.  For biarch architectures
like x86 and ppc therefore a compat macro (__WORDSIZE_COMPAT32)
assures that always the 32 bit variant is used. This avoids problems
when co-existing 32 and 64 programs access utmp/wtmp using the libc
interface.

Quite some time ago Martin tried to define this macro also for
s390/s390x:
http://sources.redhat.com/ml/libc-hacker/2002-10/msg00040.html

Unfortunately that patch never made it into glibc.  Fixing it
afterwards is a bit more difficult since there already is a lot of
64bit code passing a 64bit struct utmp to glibc functions.

-- 
           Summary: Format incompatiblity between 31/64 bit utmp
           Product: glibc
           Version: 2.4
            Status: NEW
          Severity: critical
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: krebbel1 at de dot ibm dot com
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: s390x-ibm-linux
  GCC host triplet: s390x-ibm-linux
GCC target triplet: s390x-ibm-linux


http://sourceware.org/bugzilla/show_bug.cgi?id=6724

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