/tmp/bitcoin/src/util/fs.cpp
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1 | | // Copyright (c) 2017-present The Bitcoin Core developers |
2 | | // Distributed under the MIT software license, see the accompanying |
3 | | // file COPYING or http://www.opensource.org/licenses/mit-license.php. |
4 | | |
5 | | #include <util/fs.h> |
6 | | |
7 | | #include <util/check.h> |
8 | | #include <util/syserror.h> |
9 | | |
10 | | #include <cerrno> |
11 | | #include <string> |
12 | | |
13 | | #ifndef WIN32 |
14 | | #include <fcntl.h> |
15 | | #include <unistd.h> |
16 | | #else |
17 | | #include <limits> |
18 | | #include <windows.h> |
19 | | #endif |
20 | | |
21 | | namespace fsbridge { |
22 | | |
23 | | FILE *fopen(const fs::path& p, const char *mode) |
24 | 439k | { |
25 | 439k | #ifndef WIN32 |
26 | 439k | return ::fopen(p.c_str(), mode); |
27 | | #else |
28 | | return ::fopen(p.utf8string().c_str(), mode); |
29 | | #endif |
30 | 439k | } |
31 | | |
32 | | fs::path AbsPathJoin(const fs::path& base, const fs::path& path) |
33 | 17.3k | { |
34 | 17.3k | assert(base.is_absolute()); |
35 | 17.3k | return path.empty() ? base : fs::path(base / path); |
36 | 17.3k | } |
37 | | |
38 | | #ifndef WIN32 |
39 | | |
40 | | static std::string GetErrorReason() |
41 | 4 | { |
42 | 4 | return SysErrorString(errno); |
43 | 4 | } |
44 | | |
45 | | FileLock::FileLock(const fs::path& file) |
46 | 4.46k | { |
47 | 4.46k | fd = open(file.c_str(), O_RDWR); |
48 | 4.46k | if (fd == -1) { |
49 | 0 | reason = GetErrorReason(); |
50 | 0 | } |
51 | 4.46k | } |
52 | | |
53 | | FileLock::~FileLock() |
54 | 2.23k | { |
55 | 2.23k | if (fd != -1) { |
56 | 2.23k | close(fd); |
57 | 2.23k | } |
58 | 2.23k | } |
59 | | |
60 | | bool FileLock::TryLock() |
61 | 4.46k | { |
62 | 4.46k | if (fd == -1) { |
63 | 0 | return false; |
64 | 0 | } |
65 | | |
66 | 4.46k | struct flock lock; |
67 | 4.46k | lock.l_type = F_WRLCK; |
68 | 4.46k | lock.l_whence = SEEK_SET; |
69 | 4.46k | lock.l_start = 0; |
70 | 4.46k | lock.l_len = 0; |
71 | 4.46k | if (fcntl(fd, F_SETLK, &lock) == -1) { |
72 | 4 | reason = GetErrorReason(); |
73 | 4 | return false; |
74 | 4 | } |
75 | | |
76 | 4.46k | return true; |
77 | 4.46k | } |
78 | | #else |
79 | | |
80 | | static std::string GetErrorReason() { |
81 | | return Win32ErrorString(GetLastError()); |
82 | | } |
83 | | |
84 | | FileLock::FileLock(const fs::path& file) |
85 | | { |
86 | | hFile = CreateFileW(file.wstring().c_str(), GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, |
87 | | nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr); |
88 | | if (hFile == INVALID_HANDLE_VALUE) { |
89 | | reason = GetErrorReason(); |
90 | | } |
91 | | } |
92 | | |
93 | | FileLock::~FileLock() |
94 | | { |
95 | | if (hFile != INVALID_HANDLE_VALUE) { |
96 | | CloseHandle(hFile); |
97 | | } |
98 | | } |
99 | | |
100 | | bool FileLock::TryLock() |
101 | | { |
102 | | if (hFile == INVALID_HANDLE_VALUE) { |
103 | | return false; |
104 | | } |
105 | | _OVERLAPPED overlapped = {}; |
106 | | if (!LockFileEx(hFile, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY, 0, std::numeric_limits<DWORD>::max(), std::numeric_limits<DWORD>::max(), &overlapped)) { |
107 | | reason = GetErrorReason(); |
108 | | return false; |
109 | | } |
110 | | return true; |
111 | | } |
112 | | #endif |
113 | | |
114 | | } // namespace fsbridge |