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From: "Pedro F. Giffuni" <pfg@FreeBSD.org>
Date: Tue, 22 Jul 2014 16:19:01 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r268984 - head/lib/libc/stdio
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Author: pfg
Date: Tue Jul 22 16:19:01 2014
New Revision: 268984
URL: http://svnweb.freebsd.org/changeset/base/268984

Log:
  ftello: return 1 when seeking offset on an append stream.
  
  Obtained from:	Apple Inc. (Libc 997.90.3)
  Phabric:	D442
  MFC after:	2 weeks

Modified:
  head/lib/libc/stdio/ftell.c

Modified: head/lib/libc/stdio/ftell.c
==============================================================================
--- head/lib/libc/stdio/ftell.c	Tue Jul 22 16:10:56 2014	(r268983)
+++ head/lib/libc/stdio/ftell.c	Tue Jul 22 16:19:01 2014	(r268984)
@@ -97,6 +97,8 @@ _ftello(FILE *fp, fpos_t *offset)
 	 * Find offset of underlying I/O object, then
 	 * adjust for buffered bytes.
 	 */
+	if (__sflush(fp))	/* may adjust seek offset on append stream */
+		return (1);
 	if (fp->_flags & __SOFF)
 		pos = fp->_offset;
 	else {