mirror of https://github.com/bitcoin/bitcoin.git
135 lines
3.0 KiB
C++
135 lines
3.0 KiB
C++
// Copyright (c) 2017-present The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <util/fs.h>
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#include <util/syserror.h>
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#ifndef WIN32
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#include <cstring>
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#include <fcntl.h>
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#include <sys/file.h>
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#include <sys/utsname.h>
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#include <unistd.h>
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#else
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#include <codecvt>
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#include <limits>
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#include <windows.h>
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#endif
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#include <cassert>
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#include <cerrno>
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#include <string>
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namespace fsbridge {
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FILE *fopen(const fs::path& p, const char *mode)
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{
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#ifndef WIN32
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return ::fopen(p.c_str(), mode);
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#else
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std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>,wchar_t> utf8_cvt;
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return ::_wfopen(p.wstring().c_str(), utf8_cvt.from_bytes(mode).c_str());
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#endif
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}
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fs::path AbsPathJoin(const fs::path& base, const fs::path& path)
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{
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assert(base.is_absolute());
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return path.empty() ? base : fs::path(base / path);
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}
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#ifndef WIN32
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static std::string GetErrorReason()
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{
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return SysErrorString(errno);
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}
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FileLock::FileLock(const fs::path& file)
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{
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fd = open(file.c_str(), O_RDWR);
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if (fd == -1) {
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reason = GetErrorReason();
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}
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}
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FileLock::~FileLock()
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{
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if (fd != -1) {
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close(fd);
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}
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}
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bool FileLock::TryLock()
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{
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if (fd == -1) {
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return false;
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}
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struct flock lock;
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lock.l_type = F_WRLCK;
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lock.l_whence = SEEK_SET;
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lock.l_start = 0;
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lock.l_len = 0;
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if (fcntl(fd, F_SETLK, &lock) == -1) {
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reason = GetErrorReason();
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return false;
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}
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return true;
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}
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#else
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static std::string GetErrorReason() {
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return Win32ErrorString(GetLastError());
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}
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FileLock::FileLock(const fs::path& file)
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{
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hFile = CreateFileW(file.wstring().c_str(), GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
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nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
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if (hFile == INVALID_HANDLE_VALUE) {
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reason = GetErrorReason();
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}
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}
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FileLock::~FileLock()
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{
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if (hFile != INVALID_HANDLE_VALUE) {
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CloseHandle(hFile);
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}
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}
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bool FileLock::TryLock()
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{
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if (hFile == INVALID_HANDLE_VALUE) {
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return false;
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}
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_OVERLAPPED overlapped = {};
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if (!LockFileEx(hFile, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY, 0, std::numeric_limits<DWORD>::max(), std::numeric_limits<DWORD>::max(), &overlapped)) {
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reason = GetErrorReason();
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return false;
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}
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return true;
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}
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#endif
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std::string get_filesystem_error_message(const fs::filesystem_error& e)
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{
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#ifndef WIN32
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return e.what();
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#else
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// Convert from Multi Byte to utf-16
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std::string mb_string(e.what());
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int size = MultiByteToWideChar(CP_ACP, 0, mb_string.data(), mb_string.size(), nullptr, 0);
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std::wstring utf16_string(size, L'\0');
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MultiByteToWideChar(CP_ACP, 0, mb_string.data(), mb_string.size(), &*utf16_string.begin(), size);
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// Convert from utf-16 to utf-8
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return std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>, wchar_t>().to_bytes(utf16_string);
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#endif
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}
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} // namespace fsbridge
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