changed dev_sck_sendfile_stream to handle return value of 0 by sendfile as if it's EWOULDBLOCK

lib/err.c

@@ -404,4 +404,3 @@ void hio_seterrufmtwithsyserr (hio_t* hio, int syserr_type, int syserr_code, con
 		}
 	}*/
 }
-

lib/hio-cfg.h.in

@@ -30,8 +30,7 @@
 /* Define to 1 if you have the `CRYPTO_cleanup_all_ex_data' function. */
 #undef HAVE_CRYPTO_CLEANUP_ALL_EX_DATA
 
-/* Define to 1 if you have the <dirent.h> header file, and it defines `DIR'.
-   */
+/* Define to 1 if you have the <dirent.h> header file, and it defines `DIR'. */
 #undef HAVE_DIRENT_H
 
 /* Define to 1 if you have the `dirfd' function. */

lib/sck.c

@@ -1122,6 +1122,7 @@ static int dev_sck_sendfile_stream (hio_dev_t* dev, hio_syshnd_t in_fd, hio_foff
 			return -1;
 		}
 		*len = x;
+		if (x == 0) return 0; /* treat it like EWOULDBLOCK? */
 #else
 		hio_seterrnum (hio, HIO_ENOIMPL);
 		return -1;