xapian-core  1.4.19
fd.h
Go to the documentation of this file.
1 
4 /* Copyright (C) 2011,2012 Olly Betts
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to
8  * deal in the Software without restriction, including without limitation the
9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10  * sell copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22  * IN THE SOFTWARE.
23  */
24 
25 #ifndef XAPIAN_INCLUDED_FD_H
26 #define XAPIAN_INCLUDED_FD_H
27 
28 #include "safeunistd.h"
29 
30 class FD {
31  int fd;
32 
34  FD(const FD&) = delete;
35 
37  FD& operator=(const FD&) = delete;
38 
39  public:
40  FD() : fd(-1) { }
41 
42  FD(int fd_) : fd(fd_) { }
43 
44  ~FD() { if (fd != -1) ::close(fd); }
45 
46  FD& operator=(int fd_) {
47  if (fd != -1) ::close(fd);
48  fd = fd_;
49  return *this;
50  }
51 
52  operator int() const { return fd; }
53 
54  int close() {
55  // Don't check for -1 here, so that close(FD) sets errno as close(int)
56  // would.
57  int fd_to_close = fd;
58  fd = -1;
59  return ::close(fd_to_close);
60  }
61 };
62 
63 inline int close(FD& fd) {
64  return fd.close();
65 }
66 
67 #endif
int close(FD &fd)
Definition: fd.h:63
int close()
Definition: fd.h:54
FD(int fd_)
Definition: fd.h:42
int fd
Definition: fd.h:31
FD & operator=(int fd_)
Definition: fd.h:46
Definition: fd.h:30
FD & operator=(const FD &)=delete
Prevent assignment between FD objects.
~FD()
Definition: fd.h:44
<unistd.h>, but with compat.
FD()
Definition: fd.h:40