108   errno = 0;  in fcreader()
109   if ((result = c->readfn (c->cookie, buf, n)) < 0 && errno)  in fcreader()
110     _REENT_ERRNO(ptr) = errno;  in fcreader()
130   errno = 0;  in fcwriter()
131   if ((result = c->writefn (c->cookie, buf, n)) < 0 && errno)  in fcwriter()
132     _REENT_ERRNO(ptr) = errno;  in fcwriter()
149   errno = 0;  in fcseeker()
150   if (c->seekfn (c->cookie, &offset, whence) < 0 && errno)  in fcseeker()
151     _REENT_ERRNO(ptr) = errno;  in fcseeker()
171   errno = 0;  in fcseeker64()
172   if (c->seekfn (c->cookie, &offset, whence) < 0 && errno)  in fcseeker64()
173     _REENT_ERRNO(ptr) = errno;  in fcseeker64()
186       errno = 0;  in fccloser()
187       if ((result = c->closefn (c->cookie)) < 0 && errno)  in fccloser()
188 	_REENT_ERRNO(ptr) = errno;  in fccloser()