+extern size_t
+full_read(int fd, void *buf, size_t n);
+
+extern size_t
+full_write(int fd, const void *buf, size_t n);
+
+extern size_t
+full_pread(int fd, void *buf, size_t nbyte, off_t offset);
+
+extern size_t
+full_pwrite(int fd, const void *buf, size_t count, off_t offset);
+
+#ifdef __WIN32__
+struct iovec {
+ void *iov_base;
+ size_t iov_len;
+};
+#else
+struct iovec;
+#endif
+
+extern size_t
+full_writev(int fd, struct iovec *iov, int iovcnt);
+
+extern off_t
+filedes_offset(int fd);
+
+#ifndef __WIN32__
+# define O_BINARY 0
+#endif
+