static ssize_t myread(int fd, void *buf, size_t len);
static ssize_t mywrite(int fd, void *buf, size_t len);
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#if HAVE_GSSAPI
static int check_gss_err(OM_uint32 major_status, OM_uint32 minor_status, const char *function);
static char *GSSAPI_token(const char *server);