> I get core dumps and bad behaviour from programs linked against the
> shared libc. All these programs have been compiled before the following
> change to src/lib/libc/gen/errlist.c (1.8 1998/02/08 19:07:13 kleink) came up:
> 
> 143a145,150
> >       "Authentication error",                 /* 80 - EAUTH */
> >       "Need authenticator",                   /* 81 - ENEEDAUTH */
> > 
> > /* SystemV IPC */
> >       "Identifier removed",                   /* 82 - EIDRM */
> >       "No message of desired type",           /* 83 - ENOMSG */
> 
> Is it possible for this change to break old programs?


Yes. Programs that reference `sys_errlist[]' directly, import both
the name and the size (since it's a data item) from the library at
link time.

Hence, any change to the size of the array constitutes an incompatible
interface change that should result in a new major version number.

Since we're not ready yet to bump the major on libc, these additions
must be implemented using the `internal versioning' scheme.

-pk