- extern uschar *os_getcwd(uschar *, size_t);
-#endif
-
-#ifdef OS_PIPE_RW_EINTR
- extern ssize_t os_pipe_read(int fd, void * buf, size_t count);
- extern ssize_t os_pipe_write(int fd, void * buf, size_t count);
- extern ssize_t os_pipe_writev(int fd, const struct iovec * iov, int iovcnt);
-#else
-# define os_pipe_read(fd, buf, count) read(fd, buf, count)
-# define os_pipe_write(fd, buf, count) write(fd, buf, count)
-# define os_pipe_writev(fd, buf, count) writev(fd, buf, count)