mirror of
https://github.com/facebook/sapling.git
synced 2024-10-05 06:18:07 +03:00
695c24f493
Summary: These don't compile on Windows, and in order to get mode/win to compile, we need to avoid compiling their contents. Ideally, we could do that in the TARGETS files with the select statement, but that's not available in fbcode. Thus, we do the next best thing: ifdef the file entirely. Reviewed By: wez Differential Revision: D23871728 fbshipit-source-id: b4d9df6503eaa008e649afd7bdc665cd37a9585d
149 lines
3.2 KiB
C++
149 lines
3.2 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#ifndef _WIN32
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#include "XAttr.h"
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#include <folly/Exception.h>
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#include <folly/File.h>
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namespace facebook {
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namespace eden {
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std::string getxattr(folly::StringPiece path, folly::StringPiece name) {
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folly::File file(path, O_RDONLY);
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return fgetxattr(file.fd(), name);
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}
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std::string fgetxattr(int fd, folly::StringPiece name) {
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std::string result;
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// Reasonable ballpark for most attributes we might want; this saves
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// us from an extra syscall to query the size in the common case.
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result.resize(64, 0);
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auto namestr = name.str();
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// We loop until we either hit a hard error or succeed in extracting
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// the requested information.
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while (true) {
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// First, try to read into the buffer at its existing size.
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auto size = ::fgetxattr(
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fd,
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namestr.c_str(),
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&result[0],
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result.size()
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#ifdef __APPLE__
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,
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0, // position
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0 // options
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#endif
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);
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if (size != -1) {
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result.resize(size);
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return result;
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}
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// ERANGE means that the buffer wasn't large enough. Any other
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// error terminates our attempt to get the attribute.
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if (errno != ERANGE) {
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folly::throwSystemError("fgetxattr");
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}
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// Got the wrong size, query to find out what we should have used
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size = ::fgetxattr(
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fd,
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namestr.c_str(),
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nullptr,
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0
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#ifdef __APPLE__
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,
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0, // position
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0 // options
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#endif
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);
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if (size < 0) {
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folly::throwSystemError("fgetxattr to query the size failed");
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}
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// Make sure we have room for a trailing NUL byte.
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result.resize(size + 1, 0);
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}
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}
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void fsetxattr(int fd, folly::StringPiece name, folly::StringPiece value) {
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auto namestr = name.str();
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folly::checkUnixError(::fsetxattr(
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fd,
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namestr.c_str(),
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value.data(),
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value.size()
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#ifdef __APPLE__
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,
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0 // position
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#endif
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,
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0 // allow create and replace
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));
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}
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std::vector<std::string> listxattr(folly::StringPiece path) {
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std::string buf;
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auto pathStr = path.str();
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buf.resize(128, 0);
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while (true) {
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auto size = ::listxattr(
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pathStr.c_str(),
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&buf[0],
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buf.size()
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#ifdef __APPLE__
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,
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XATTR_NOFOLLOW
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#endif
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);
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if (size != -1) {
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// Success; parse the result in a list of names separated by NUL
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// bytes, terminated by a NUL byte.
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std::vector<std::string> result;
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// Don't include the final terminator in the size, as that just causes
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// the split array to contain a final empty name.
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folly::split('\0', folly::StringPiece(buf.data(), size - 1), result);
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return result;
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}
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if (errno != ERANGE) {
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folly::throwSystemError("listxattr");
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}
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// Query for the size
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size = ::listxattr(
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pathStr.c_str(),
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nullptr,
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0
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#ifdef __APPLE__
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,
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XATTR_NOFOLLOW
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#endif
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);
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if (size == -1) {
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folly::throwSystemError("listxattr");
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}
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buf.resize(size, 0);
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}
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}
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} // namespace eden
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} // namespace facebook
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#endif
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