92   void *cookie;  member
102        void *cookie,  in fcreader()  argument
107   fccookie *c = (fccookie *) cookie;  in fcreader()
109   if ((result = c->readfn (c->cookie, buf, n)) < 0 && errno)  in fcreader()
116        void *cookie,  in fcwriter()  argument
121   fccookie *c = (fccookie *) cookie;  in fcwriter()
125       c->fp->_seek64 (cookie, 0, SEEK_END);  in fcwriter()
127       c->fp->_seek (cookie, 0, SEEK_END);  in fcwriter()
131   if ((result = c->writefn (c->cookie, buf, n)) < 0 && errno)  in fcwriter()
138        void *cookie,  in fcseeker()  argument
142   fccookie *c = (fccookie *) cookie;  in fcseeker()
150   if (c->seekfn (c->cookie, &offset, whence) < 0 && errno)  in fcseeker()
165        void *cookie,  in fcseeker64()  argument
170   fccookie *c = (fccookie *) cookie;  in fcseeker64()
172   if (c->seekfn (c->cookie, &offset, whence) < 0 && errno)  in fcseeker64()
180        void *cookie)  in fccloser()  argument
183   fccookie *c = (fccookie *) cookie;  in fccloser()
187       if ((result = c->closefn (c->cookie)) < 0 && errno)  in fccloser()
196        void *cookie,  in fopencookie()  argument
229   c->cookie = cookie;  in fopencookie()