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
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/*
* Copyright (C) 2012-2015 Max Kellermann <max@duempel.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "FileDescriptor.hxx"
#include <sys/stat.h>
#include <fcntl.h>
#ifndef WIN32
#include <poll.h>
#endif
#ifdef USE_EVENTFD
#include <sys/eventfd.h>
#endif
#ifdef USE_SIGNALFD
#include <sys/signalfd.h>
#endif
#ifdef HAVE_INOTIFY_INIT
#include <sys/inotify.h>
#endif
#ifndef O_NOCTTY
#define O_NOCTTY 0
#endif
#ifndef O_CLOEXEC
#define O_CLOEXEC 0
#endif
bool
FileDescriptor::Open(const char *pathname, int flags)
{
fd = ::open(pathname, flags);
return IsDefined();
}
bool
FileDescriptor::OpenReadOnly(const char *pathname)
{
return Open(pathname, O_RDONLY | O_NOCTTY | O_CLOEXEC);
}
#ifndef WIN32
bool
FileDescriptor::OpenNonBlocking(const char *pathname)
{
return Open(pathname, O_RDWR | O_NOCTTY | O_CLOEXEC | O_NONBLOCK);
}
bool
FileDescriptor::CreatePipe(FileDescriptor &r, FileDescriptor &w)
{
int fds[2];
#ifdef HAVE_PIPE2
const int flags = O_CLOEXEC;
const int result = pipe2(fds, flags);
#else
const int result = pipe(fds);
#endif
if (result < 0)
return false;
r = FileDescriptor(fds[0]);
w = FileDescriptor(fds[1]);
return true;
}
void
FileDescriptor::SetNonBlocking()
{
assert(IsDefined());
int flags = fcntl(fd, F_GETFL);
fcntl(fd, F_SETFL, flags | O_NONBLOCK);
}
void
FileDescriptor::SetBlocking()
{
assert(IsDefined());
int flags = fcntl(fd, F_GETFL);
fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
}
#endif
#ifdef USE_EVENTFD
bool
FileDescriptor::CreateEventFD(unsigned initval)
{
fd = ::eventfd(initval, EFD_NONBLOCK|EFD_CLOEXEC);
return fd >= 0;
}
#endif
#ifdef USE_SIGNALFD
bool
FileDescriptor::CreateSignalFD(const sigset_t *mask)
{
int new_fd = ::signalfd(fd, mask, SFD_NONBLOCK|SFD_CLOEXEC);
if (new_fd < 0)
return false;
fd = new_fd;
return true;
}
#endif
#ifdef HAVE_INOTIFY_INIT
bool
FileDescriptor::CreateInotify()
{
#ifdef HAVE_INOTIFY_INIT1
int new_fd = inotify_init1(IN_CLOEXEC|IN_NONBLOCK);
#else
int new_fd = inotify_init();
#endif
if (new_fd < 0)
return false;
#ifndef HAVE_INOTIFY_INIT1
SetNonBlocking();
#endif
fd = new_fd;
return true;
}
#endif
bool
FileDescriptor::Rewind()
{
assert(IsDefined());
return lseek(fd, 0, SEEK_SET) == 0;
}
off_t
FileDescriptor::GetSize() const
{
struct stat st;
return ::fstat(fd, &st) >= 0
? (long)st.st_size
: -1;
}
#ifndef WIN32
int
FileDescriptor::Poll(short events, int timeout) const
{
assert(IsDefined());
struct pollfd pfd;
pfd.fd = fd;
pfd.events = events;
int result = poll(&pfd, 1, timeout);
return result > 0
? pfd.revents
: result;
}
int
FileDescriptor::WaitReadable(int timeout) const
{
return Poll(POLLIN, timeout);
}
int
FileDescriptor::WaitWritable(int timeout) const
{
return Poll(POLLOUT, timeout);
}
#endif
|
