13 pub type ssize_t = isize;  typedef
499     pub fn read(fd: c_int, ptr: *mut c_void, size: size_t) -> ssize_t;  in read()  argument
504     pub fn write(fd: c_int, ptr: *const c_void, size: size_t) -> ssize_t;  in write()  argument
662     ) -> ssize_t;  in readlinkat()  argument
683     pub fn pread(fd: c_int, buf: *mut c_void, count: size_t, offset: off_t) -> ssize_t;  in pread()  argument
684     pub fn pwrite(fd: c_int, buf: *const c_void, count: size_t, offset: off_t) -> ssize_t;  in pwrite()  argument
704     pub fn send(socket: c_int, buf: *const c_void, len: size_t, flags: c_int) -> ssize_t;  in send()  argument
705     pub fn recv(socket: c_int, buf: *mut c_void, len: size_t, flags: c_int) -> ssize_t;  in recv()  argument
710     pub fn readlink(path: *const c_char, buf: *mut c_char, bufsz: size_t) -> ssize_t;  in readlink()  argument
723     pub fn getline(lineptr: *mut *mut c_char, n: *mut size_t, stream: *mut FILE) -> ssize_t;  in getline()  argument
726     pub fn writev(fd: c_int, iov: *const crate::iovec, iovcnt: c_int) -> ssize_t;  in writev()  argument
727     pub fn readv(fd: c_int, iov: *const crate::iovec, iovcnt: c_int) -> ssize_t;  in readv()  argument
728     pub fn pwritev(fd: c_int, iov: *const crate::iovec, iovcnt: c_int, offset: off_t) -> ssize_t;  in pwritev()  argument
729     pub fn preadv(fd: c_int, iov: *const crate::iovec, iovcnt: c_int, offset: off_t) -> ssize_t;  in preadv()  argument