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ea4a0888 MM |
1 | /* scoped_fd, automatically close a file descriptor |
2 | ||
3 | Copyright (C) 2018 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #ifndef SCOPED_FD_H | |
21 | #define SCOPED_FD_H | |
22 | ||
ea4a0888 | 23 | #include <unistd.h> |
36033ef5 | 24 | #include "filestuff.h" |
ea4a0888 MM |
25 | |
26 | /* A smart-pointer-like class to automatically close a file descriptor. */ | |
27 | ||
28 | class scoped_fd | |
29 | { | |
30 | public: | |
31 | explicit scoped_fd (int fd = -1) noexcept : m_fd (fd) {} | |
32 | ~scoped_fd () | |
33 | { | |
34 | if (m_fd >= 0) | |
35 | close (m_fd); | |
36 | } | |
37 | ||
38 | DISABLE_COPY_AND_ASSIGN (scoped_fd); | |
39 | ||
40 | int release () noexcept | |
41 | { | |
42 | int fd = m_fd; | |
43 | m_fd = -1; | |
44 | return fd; | |
45 | } | |
46 | ||
36033ef5 TT |
47 | /* Like release, but return a gdb_file_up that owns the file |
48 | descriptor. On success, this scoped_fd will be released. On | |
49 | failure, return NULL and leave this scoped_fd in possession of | |
50 | the fd. */ | |
51 | gdb_file_up to_file (const char *mode) noexcept | |
52 | { | |
53 | gdb_file_up result (fdopen (m_fd, mode)); | |
54 | if (result != nullptr) | |
55 | m_fd = -1; | |
56 | return result; | |
57 | } | |
58 | ||
ea4a0888 MM |
59 | int get () const noexcept |
60 | { | |
61 | return m_fd; | |
62 | } | |
63 | ||
64 | private: | |
65 | int m_fd; | |
66 | }; | |
67 | ||
ea4a0888 | 68 | #endif /* SCOPED_FD_H */ |