stdio.c revision 290001 
1/*
2 * Copyright (C) 2004, 2007, 2011, 2012  Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 2000, 2001  Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
16 */
17
18/* $Id$ */
19
20#include <config.h>
21
22#include <errno.h>
23#include <unistd.h>
24
25#include <isc/stdio.h>
26#include <isc/stat.h>
27
28#include "errno2result.h"
29
30isc_result_t
31isc_stdio_open(const char *filename, const char *mode, FILE **fp) {
32	FILE *f;
33
34	f = fopen(filename, mode);
35	if (f == NULL)
36		return (isc__errno2result(errno));
37	*fp = f;
38	return (ISC_R_SUCCESS);
39}
40
41isc_result_t
42isc_stdio_close(FILE *f) {
43	int r;
44
45	r = fclose(f);
46	if (r == 0)
47		return (ISC_R_SUCCESS);
48	else
49		return (isc__errno2result(errno));
50}
51
52isc_result_t
53isc_stdio_seek(FILE *f, long offset, int whence) {
54	int r;
55
56	r = fseek(f, offset, whence);
57	if (r == 0)
58		return (ISC_R_SUCCESS);
59	else
60		return (isc__errno2result(errno));
61}
62
63isc_result_t
64isc_stdio_read(void *ptr, size_t size, size_t nmemb, FILE *f, size_t *nret) {
65	isc_result_t result = ISC_R_SUCCESS;
66	size_t r;
67
68	clearerr(f);
69	r = fread(ptr, size, nmemb, f);
70	if (r != nmemb) {
71		if (feof(f))
72			result = ISC_R_EOF;
73		else
74			result = isc__errno2result(errno);
75	}
76	if (nret != NULL)
77		*nret = r;
78	return (result);
79}
80
81isc_result_t
82isc_stdio_write(const void *ptr, size_t size, size_t nmemb, FILE *f,
83	       size_t *nret)
84{
85	isc_result_t result = ISC_R_SUCCESS;
86	size_t r;
87
88	clearerr(f);
89	r = fwrite(ptr, size, nmemb, f);
90	if (r != nmemb)
91		result = isc__errno2result(errno);
92	if (nret != NULL)
93		*nret = r;
94	return (result);
95}
96
97isc_result_t
98isc_stdio_flush(FILE *f) {
99	int r;
100
101	r = fflush(f);
102	if (r == 0)
103		return (ISC_R_SUCCESS);
104	else
105		return (isc__errno2result(errno));
106}
107
108/*
109 * OpenBSD has deprecated ENOTSUP in favor of EOPNOTSUPP.
110 */
111#if defined(EOPNOTSUPP) && !defined(ENOTSUP)
112#define ENOTSUP EOPNOTSUPP
113#endif
114
115isc_result_t
116isc_stdio_sync(FILE *f) {
117	int r;
118
119	r = fsync(fileno(f));
120	/*
121	 * fsync is not supported on sockets and pipes which
122	 * result in EINVAL / ENOTSUP.
123	 */
124	if (r == 0 || errno == EINVAL || errno == ENOTSUP)
125		return (ISC_R_SUCCESS);
126	else
127		return (isc__errno2result(errno));
128}
129
130