1 /* @(#)nixread.c 1.14 09/06/30 Copyright 1986, 1996-2009 J. Schilling */
2 /*
3 * Non interruptable extended read
4 *
5 * Copyright (c) 1986, 1996-2009 J. Schilling
6 */
7 /*
8 * The contents of this file are subject to the terms of the
9 * Common Development and Distribution License, Version 1.0 only
10 * (the "License"). You may not use this file except in compliance
11 * with the License.
12 *
13 * See the file CDDL.Schily.txt in this distribution for details.
14 * A copy of the CDDL is also available via the Internet at
15 * http://www.opensource.org/licenses/cddl1.txt
16 *
17 * When distributing Covered Code, include this CDDL HEADER in each
18 * file and include the License file CDDL.Schily.txt from this distribution.
19 */
20
21 #include "schilyio.h"
22
23 EXPORT ssize_t
_nixread(f,buf,count)24 _nixread(f, buf, count)
25 int f;
26 void *buf;
27 size_t count;
28 {
29 register char *p = (char *)buf;
30 register ssize_t ret;
31 register int total = 0;
32 int oerrno = geterrno();
33
34 if ((ret = (ssize_t)count) < 0) {
35 seterrno(EINVAL);
36 return ((ssize_t)-1);
37 }
38 while (count > 0) {
39 while ((ret = read(f, p, count)) < 0) {
40 if (geterrno() == EINTR) {
41 /*
42 * Set back old 'errno' so we don't change the
43 * errno visible to the outside if we did
44 * not fail.
45 */
46 seterrno(oerrno);
47 continue;
48 }
49 return (ret); /* Any other error */
50 }
51 if (ret == 0) /* Something went wrong */
52 break;
53
54 total += ret;
55 count -= ret;
56 p += ret;
57 }
58 return (total);
59 }
60