From: Jim Meyering <jim@meyering.net>
Date: Mon, 24 Oct 2005 16:07:36 +0000 (+0000)
Subject: (tac_file): When determining whether a file is seekable,
X-Git-Tag: v6.0~1463
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=91795f6fa29eac96e3a18d1c2198c66f3fca364a;p=thirdparty%2Fcoreutils.git

(tac_file): When determining whether a file is seekable,
also test whether it is a tty.  Using only the lseek-based test would
give a false positive on Solaris.  Reported by Peter Fales.
---

diff --git a/src/tac.c b/src/tac.c
index c5fbe24e6a..0b68a0ef3d 100644
--- a/src/tac.c
+++ b/src/tac.c
@@ -547,9 +547,9 @@ tac_file (const char *filename)
 
   file_size = lseek (fd, (off_t) 0, SEEK_END);
 
-  ok = (0 <= file_size
-	? tac_seekable (fd, filename)
-	: tac_nonseekable (fd, filename));
+  ok = (file_size < 0 || isatty (fd)
+	? tac_nonseekable (fd, filename)
+	: tac_seekable (fd, filename));
 
   if (!is_stdin && close (fd) != 0)
     {