1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
/* glib-unixprivate.h - Unix specific integration private functions
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __G_UNIXPRIVATE_H__
#define __G_UNIXPRIVATE_H__
#include "config.h"
#ifndef G_OS_UNIX
#error "This header may only be used on UNIX"
#endif
/* To make bionic export pipe2() */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#include "gmacros.h"
#include "gtypes.h"
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
G_BEGIN_DECLS
static inline gboolean
g_unix_open_pipe_internal (int *fds,
gboolean close_on_exec,
gboolean nonblock)
{
#ifdef HAVE_PIPE2
do
{
int ecode;
int flags = 0;
if (close_on_exec)
flags |= O_CLOEXEC;
if (nonblock)
flags |= O_NONBLOCK;
/* Atomic */
ecode = pipe2 (fds, flags);
if (ecode == -1 && errno != ENOSYS)
return FALSE;
else if (ecode == 0)
return TRUE;
/* Fall through on -ENOSYS, we must be running on an old kernel */
}
while (FALSE);
#endif
if (pipe (fds) == -1)
return FALSE;
if (close_on_exec)
{
if (fcntl (fds[0], F_SETFD, FD_CLOEXEC) == -1 ||
fcntl (fds[1], F_SETFD, FD_CLOEXEC) == -1)
{
int saved_errno = errno;
close (fds[0]);
close (fds[1]);
fds[0] = -1;
fds[1] = -1;
errno = saved_errno;
return FALSE;
}
}
if (nonblock)
{
#ifdef O_NONBLOCK
int flags = O_NONBLOCK;
#else
int flags = O_NDELAY;
#endif
if (fcntl (fds[0], F_SETFL, flags) == -1 ||
fcntl (fds[1], F_SETFL, flags) == -1)
{
int saved_errno = errno;
close (fds[0]);
close (fds[1]);
fds[0] = -1;
fds[1] = -1;
errno = saved_errno;
return FALSE;
}
}
return TRUE;
}
G_END_DECLS
#endif /* __G_UNIXPRIVATE_H__ */
|
