X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=fd.c;h=3a8406d9c9fd1454a0807c8584bae78aa1b2f543;hp=a04232f84b3fd239249c866cb5a109551ad2b926;hb=4744d937c4160898d1fe151257606430750e580c;hpb=f0e41e36c3f1a3a5bb6ff66d92d2814391d8f908

diff --git a/fd.c b/fd.c
index a04232f8..3a8406d9 100644
--- a/fd.c
+++ b/fd.c
@@ -617,6 +617,22 @@ int mmap_full_file(const char *path, int open_mode, void **map,
 		goto out;
 	}
 	*size = file_status.st_size;
+	/*
+	 * If the file is empty, *size is zero and mmap() would return EINVAL
+	 * (Invalid argument). This error is common enough to spend an extra
+	 * error code which explicitly states the problem.
+	 */
+	ret = -E_EMPTY;
+	if (*size == 0)
+		goto out;
+	/*
+	 * If fd refers to a directory, mmap() returns ENODEV (No such device),
+	 * at least on Linux. "Is a directory" seems to be more to the point.
+	 */
+	ret = -ERRNO_TO_PARA_ERROR(EISDIR);
+	if (S_ISDIR(file_status.st_mode))
+		goto out;
+
 	ret = para_mmap(*size, mmap_prot, mmap_flags, fd, 0, map);
 out:
 	if (ret < 0 || !fd_ptr)