- int (*msasl_read) (CONNECTION * conn, char *buf, size_t len);
- int (*msasl_write) (CONNECTION * conn, const char *buf, size_t count);
+ int (*msasl_read) (CONNECTION * conn, char *buf, ssize_t len);
+ int (*msasl_write) (CONNECTION * conn, const char *buf, ssize_t count);