-extern ssize_t _sysio_validx(const struct intnl_xtvec *xtv, size_t xtvlen,
- const struct iovec *iov, size_t iovlen,
- _SYSIO_OFF_T limit);
-extern ssize_t _sysio_enumerate_extents(const struct intnl_xtvec *xtv,
- size_t xtvlen,
- const struct iovec *iov,
- size_t iovlen,
- ssize_t (*f)(const struct iovec *,
- int,
- _SYSIO_OFF_T,
- ssize_t,
- void *),
- void *arg);
-extern ssize_t _sysio_enumerate_iovec(const struct iovec *iov,
- size_t count,
- _SYSIO_OFF_T off,
- ssize_t limit,
- ssize_t (*f)(void *,
- size_t,
- _SYSIO_OFF_T,
- void *),
- void *arg);
-extern ssize_t _sysio_doio(const struct intnl_xtvec *xtv, size_t xtvlen,
- const struct iovec *iov, size_t iovlen,
- ssize_t (*f)(void *, size_t, _SYSIO_OFF_T, void *),
- void *arg);