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void catstrerror(string *reason, const char *what, int _errno)

{

    if (!reason)

  return;

    if (what)

  reason->append(what);

    reason->append(": errno: ");

    char nbuf[20];

    sprintf(nbuf, "%d", _errno);

    reason->append(nbuf);

    reason->append(" : ");

#ifdef sun

    // Note: sun strerror is noted mt-safe ??

    reason->append(strerror(_errno));

#else

#define ERRBUFSZ 200    

    char errbuf[ERRBUFSZ];

    // There are 2 versions of strerror_r. 

    // - The GNU one returns a pointer to the message (maybe

    //   static storage or supplied buffer).

    // - The POSIX one always stores in supplied buffer and

    //   returns 0 on success. As the possibility of error and

    //   error code are not specified, we're basically doomed

    //   cause we can't use a test on the 0 value to know if we

    //   were returned a pointer... 

    // Also couldn't find an easy way to disable the gnu version without

    // changing the cxxflags globally, so forget it. Recent gnu lib versions

    // normally default to the posix version.

    // At worse we get no message at all here.

    errbuf[0] = 0;

    strerror_r(_errno, errbuf, ERRBUFSZ);

    reason->append(errbuf);

#endif

}