1/*
2 * Copyright (C) 2016 Igalia S.L.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. 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 *
13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include <wtf/UniStdExtras.h>
28
29#include <fcntl.h>
30
31namespace WTF {
32
33bool setCloseOnExec(int fileDescriptor)
34{
35 int returnValue = -1;
36 do {
37 int flags = fcntl(fileDescriptor, F_GETFD);
38 if (flags != -1)
39 returnValue = fcntl(fileDescriptor, F_SETFD, flags | FD_CLOEXEC);
40 } while (returnValue == -1 && errno == EINTR);
41
42 return returnValue != -1;
43}
44
45int dupCloseOnExec(int fileDescriptor)
46{
47 int duplicatedFileDescriptor = -1;
48#ifdef F_DUPFD_CLOEXEC
49 while ((duplicatedFileDescriptor = fcntl(fileDescriptor, F_DUPFD_CLOEXEC, 0)) == -1 && errno == EINTR) { }
50 if (duplicatedFileDescriptor != -1)
51 return duplicatedFileDescriptor;
52
53#endif
54
55 while ((duplicatedFileDescriptor = dup(fileDescriptor)) == -1 && errno == EINTR) { }
56 if (duplicatedFileDescriptor == -1)
57 return -1;
58
59 if (!setCloseOnExec(duplicatedFileDescriptor)) {
60 closeWithRetry(duplicatedFileDescriptor);
61 return -1;
62 }
63
64 return duplicatedFileDescriptor;
65}
66
67bool setNonBlock(int fileDescriptor)
68{
69 int returnValue = -1;
70
71 int flags = fcntl(fileDescriptor, F_GETFL, 0);
72 while ((returnValue = fcntl(fileDescriptor, F_SETFL, flags | O_NONBLOCK)) == -1 && errno == EINTR) { }
73
74 return returnValue != -1;
75}
76
77} // namespace WTF
78