1 /* @(#)ffileread.c	1.13 09/06/30 Copyright 1986, 1996-2009 J. Schilling */
2 /*
3  *	Copyright (c) 1986, 1996-2009 J. Schilling
4  */
5 /*
6  * The contents of this file are subject to the terms of the
7  * Common Development and Distribution License, Version 1.0 only
8  * (the "License").  You may not use this file except in compliance
9  * with the License.
10  *
11  * See the file CDDL.Schily.txt in this distribution for details.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file CDDL.Schily.txt from this distribution.
15  */
16 
17 #include "schilyio.h"
18 
19 EXPORT ssize_t
20 ffileread(f, buf, len)
21 	register FILE	*f;
22 	void	*buf;
23 	size_t	len;
24 {
25 	register int		fd;
26 	register ssize_t	ret;
27 		int		oerrno = geterrno();
28 
29 	down2(f, _IOREAD, _IORW);
30 	fd = fileno(f);
31 
32 	while ((ret = read(fd, buf, len)) < 0 && geterrno() == EINTR) {
33 		/*
34 		 * Set back old 'errno' so we don't change the errno visible
35 		 * to the outside if we did not fail.
36 		 */
37 		seterrno(oerrno);
38 	}
39 	return (ret);
40 }
41