1/*
2 * Copyright (c) 2008 The Hewlett-Packard Development Company
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Nathan Binkert
29 */
30
31#include <cerrno>
32#include <cstdio>
33
34#include "base/atomicio.hh"
35
36ssize_t
37atomic_read(int fd, void *s, size_t n)
38{
39 char *p = reinterpret_cast<char *>(s);
| 1/*
2 * Copyright (c) 2008 The Hewlett-Packard Development Company
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Nathan Binkert
29 */
30
31#include <cerrno>
32#include <cstdio>
33
34#include "base/atomicio.hh"
35
36ssize_t
37atomic_read(int fd, void *s, size_t n)
38{
39 char *p = reinterpret_cast<char *>(s);
|
41
42 // Keep reading until we've gotten all of the data.
43 while (n > pos) {
44 ssize_t result = read(fd, p + pos, n - pos);
45
46 // We didn't get any more data, so we should probably punt,
47 // otherwise we'd just keep spinning
48 if (result == 0)
49 break;
50
51 // If there was an error, try again on EINTR/EAGAIN, pass the
52 // error up otherwise.
53 if (result == -1) {
54 if (errno == EINTR || errno == EAGAIN)
55 continue;
56 return result;
57 }
58
59 pos += result;
60 }
61
62 return pos;
63}
64
65ssize_t
66atomic_write(int fd, const void *s, size_t n)
67{
68 const char *p = reinterpret_cast<const char *>(s);
| 41
42 // Keep reading until we've gotten all of the data.
43 while (n > pos) {
44 ssize_t result = read(fd, p + pos, n - pos);
45
46 // We didn't get any more data, so we should probably punt,
47 // otherwise we'd just keep spinning
48 if (result == 0)
49 break;
50
51 // If there was an error, try again on EINTR/EAGAIN, pass the
52 // error up otherwise.
53 if (result == -1) {
54 if (errno == EINTR || errno == EAGAIN)
55 continue;
56 return result;
57 }
58
59 pos += result;
60 }
61
62 return pos;
63}
64
65ssize_t
66atomic_write(int fd, const void *s, size_t n)
67{
68 const char *p = reinterpret_cast<const char *>(s);
|
70
71 // Keep writing until we've written all of the data
72 while (n > pos) {
73 ssize_t result = write(fd, p + pos, n - pos);
74
75 // We didn't manage to write anything this time, so we should
76 // probably punt, otherwise we'd just keep spinning
77 if (result == 0)
78 break;
79
80 // If there was an error, try again on EINTR/EAGAIN, pass the
81 // error up otherwise.
82 if (result == -1) {
83 if (errno == EINTR || errno == EAGAIN)
84 continue;
85 return result;
86 }
87
88 pos += result;
89 }
90
91 return pos;
92}
| 70
71 // Keep writing until we've written all of the data
72 while (n > pos) {
73 ssize_t result = write(fd, p + pos, n - pos);
74
75 // We didn't manage to write anything this time, so we should
76 // probably punt, otherwise we'd just keep spinning
77 if (result == 0)
78 break;
79
80 // If there was an error, try again on EINTR/EAGAIN, pass the
81 // error up otherwise.
82 if (result == -1) {
83 if (errno == EINTR || errno == EAGAIN)
84 continue;
85 return result;
86 }
87
88 pos += result;
89 }
90
91 return pos;
92}
|