/Users/eugenesiegel/btc/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 | | #include <util/syserror.h> |
7 | | |
8 | | #ifndef WIN32 |
9 | | #include <cstring> |
10 | | #include <fcntl.h> |
11 | | #include <sys/file.h> |
12 | | #include <sys/utsname.h> |
13 | | #include <unistd.h> |
14 | | #else |
15 | | #include <codecvt> |
16 | | #include <limits> |
17 | | #include <windows.h> |
18 | | #endif |
19 | | |
20 | | #include <cassert> |
21 | | #include <cerrno> |
22 | | #include <string> |
23 | | |
24 | | namespace fsbridge { |
25 | | |
26 | | FILE *fopen(const fs::path& p, const char *mode) |
27 | 20.3M | { |
28 | 20.3M | #ifndef WIN32 |
29 | 20.3M | return ::fopen(p.c_str(), mode); |
30 | | #else |
31 | | std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>,wchar_t> utf8_cvt; |
32 | | return ::_wfopen(p.wstring().c_str(), utf8_cvt.from_bytes(mode).c_str()); |
33 | | #endif |
34 | 20.3M | } |
35 | | |
36 | | fs::path AbsPathJoin(const fs::path& base, const fs::path& path) |
37 | 0 | { |
38 | 0 | assert(base.is_absolute()); |
39 | 0 | return path.empty() ? base : fs::path(base / path); |
40 | 0 | } |
41 | | |
42 | | #ifndef WIN32 |
43 | | |
44 | | static std::string GetErrorReason() |
45 | 0 | { |
46 | 0 | return SysErrorString(errno); |
47 | 0 | } |
48 | | |
49 | | FileLock::FileLock(const fs::path& file) |
50 | 0 | { |
51 | 0 | fd = open(file.c_str(), O_RDWR); |
52 | 0 | if (fd == -1) { |
53 | 0 | reason = GetErrorReason(); |
54 | 0 | } |
55 | 0 | } |
56 | | |
57 | | FileLock::~FileLock() |
58 | 0 | { |
59 | 0 | if (fd != -1) { |
60 | 0 | close(fd); |
61 | 0 | } |
62 | 0 | } |
63 | | |
64 | | bool FileLock::TryLock() |
65 | 0 | { |
66 | 0 | if (fd == -1) { |
67 | 0 | return false; |
68 | 0 | } |
69 | | |
70 | 0 | struct flock lock; |
71 | 0 | lock.l_type = F_WRLCK; |
72 | 0 | lock.l_whence = SEEK_SET; |
73 | 0 | lock.l_start = 0; |
74 | 0 | lock.l_len = 0; |
75 | 0 | if (fcntl(fd, F_SETLK, &lock) == -1) { |
76 | 0 | reason = GetErrorReason(); |
77 | 0 | return false; |
78 | 0 | } |
79 | | |
80 | 0 | return true; |
81 | 0 | } |
82 | | #else |
83 | | |
84 | | static std::string GetErrorReason() { |
85 | | return Win32ErrorString(GetLastError()); |
86 | | } |
87 | | |
88 | | FileLock::FileLock(const fs::path& file) |
89 | | { |
90 | | hFile = CreateFileW(file.wstring().c_str(), GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, |
91 | | nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr); |
92 | | if (hFile == INVALID_HANDLE_VALUE) { |
93 | | reason = GetErrorReason(); |
94 | | } |
95 | | } |
96 | | |
97 | | FileLock::~FileLock() |
98 | | { |
99 | | if (hFile != INVALID_HANDLE_VALUE) { |
100 | | CloseHandle(hFile); |
101 | | } |
102 | | } |
103 | | |
104 | | bool FileLock::TryLock() |
105 | | { |
106 | | if (hFile == INVALID_HANDLE_VALUE) { |
107 | | return false; |
108 | | } |
109 | | _OVERLAPPED overlapped = {}; |
110 | | if (!LockFileEx(hFile, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY, 0, std::numeric_limits<DWORD>::max(), std::numeric_limits<DWORD>::max(), &overlapped)) { |
111 | | reason = GetErrorReason(); |
112 | | return false; |
113 | | } |
114 | | return true; |
115 | | } |
116 | | #endif |
117 | | |
118 | | } // namespace fsbridge |