X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=fd.c;h=9b6c6917232eb5063bb3acaad51a24ea53226389;hp=ea16bdda993aff814fa41684af53506e46242a4f;hb=d9566a07057f68b0effd404e2da7817555f35383;hpb=8acdfc3d6d124581d0b624e61e0047f576eb4748

diff --git a/fd.c b/fd.c
index ea16bdda..9b6c6917 100644
--- a/fd.c
+++ b/fd.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2006-2011 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2012 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -541,6 +541,22 @@ 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)