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9b391c513e
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120800 91177308-0d34-0410-b5e6-96231b3b80d8
299 lines
8.6 KiB
C++
299 lines
8.6 KiB
C++
//===- llvm/Support/Unix/PathV2.cpp - Unix Path Implementation --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Unix specific implementation of the PathV2 API.
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only generic UNIX code that
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//=== is guaranteed to work on *all* UNIX variants.
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//===----------------------------------------------------------------------===//
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#include "Unix.h"
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#if HAVE_STDIO_H
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#include <stdio.h>
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#endif
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using namespace llvm;
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namespace {
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struct AutoFD {
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int FileDescriptor;
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AutoFD(int fd) : FileDescriptor(fd) {}
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~AutoFD() {
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if (FileDescriptor >= 0)
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::close(FileDescriptor);
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}
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int take() {
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int ret = FileDescriptor;
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FileDescriptor = -1;
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return ret;
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}
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operator int() const {return FileDescriptor;}
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};
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error_code TempDir(SmallVectorImpl<char> &result) {
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// FIXME: Don't use TMPDIR if program is SUID or SGID enabled.
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const char *dir = 0;
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(dir = std::getenv("TMPDIR" )) ||
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(dir = std::getenv("TMP" )) ||
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(dir = std::getenv("TEMP" )) ||
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(dir = std::getenv("TEMPDIR")) ||
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#ifdef P_tmpdir
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(dir = P_tmpdir) ||
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#endif
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(dir = "/tmp");
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result.set_size(0);
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StringRef d(dir);
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result.append(d.begin(), d.end());
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return make_error_code(errc::success);
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}
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}
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namespace llvm {
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namespace sys {
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namespace path {
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error_code current_path(SmallVectorImpl<char> &result) {
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long size = ::pathconf(".", _PC_PATH_MAX);
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result.reserve(size + 1);
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result.set_size(size + 1);
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if (::getcwd(result.data(), result.size()) == 0)
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return error_code(errno, system_category());
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result.set_size(strlen(result.data()));
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return make_error_code(errc::success);
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}
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} // end namespace path
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namespace fs{
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error_code copy_file(const Twine &from, const Twine &to, copy_option copt) {
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// Get arguments.
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SmallString<128> from_storage;
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SmallString<128> to_storage;
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StringRef f = from.toNullTerminatedStringRef(from_storage);
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StringRef t = to.toNullTerminatedStringRef(to_storage);
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const size_t buf_sz = 32768;
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char buffer[buf_sz];
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int from_file = -1, to_file = -1;
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// Open from.
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if ((from_file = ::open(f.begin(), O_RDONLY)) < 0)
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return error_code(errno, system_category());
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AutoFD from_fd(from_file);
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// Stat from.
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struct stat from_stat;
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if (::stat(f.begin(), &from_stat) != 0)
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return error_code(errno, system_category());
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// Setup to flags.
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int to_flags = O_CREAT | O_WRONLY;
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if (copt == copy_option::fail_if_exists)
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to_flags |= O_EXCL;
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// Open to.
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if ((to_file = ::open(t.begin(), to_flags, from_stat.st_mode)) < 0)
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return error_code(errno, system_category());
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AutoFD to_fd(to_file);
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// Copy!
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ssize_t sz, sz_read = 1, sz_write;
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while (sz_read > 0 &&
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(sz_read = ::read(from_fd, buffer, buf_sz)) > 0) {
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// Allow for partial writes - see Advanced Unix Programming (2nd Ed.),
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// Marc Rochkind, Addison-Wesley, 2004, page 94
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sz_write = 0;
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do {
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if ((sz = ::write(to_fd, buffer + sz_write, sz_read - sz_write)) < 0) {
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sz_read = sz; // cause read loop termination.
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break; // error.
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}
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sz_write += sz;
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} while (sz_write < sz_read);
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}
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// After all the file operations above the return value of close actually
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// matters.
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if (::close(from_fd.take()) < 0) sz_read = -1;
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if (::close(to_fd.take()) < 0) sz_read = -1;
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// Check for errors.
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if (sz_read < 0)
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return error_code(errno, system_category());
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return make_error_code(errc::success);
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}
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error_code create_directory(const Twine &path, bool &existed) {
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SmallString<128> path_storage;
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StringRef p = path.toNullTerminatedStringRef(path_storage);
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if (::mkdir(p.begin(), 0700) == -1) {
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if (errno != EEXIST)
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return error_code(errno, system_category());
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existed = true;
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} else
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existed = false;
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return make_error_code(errc::success);
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}
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error_code create_hard_link(const Twine &to, const Twine &from) {
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// Get arguments.
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SmallString<128> from_storage;
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SmallString<128> to_storage;
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StringRef f = from.toNullTerminatedStringRef(from_storage);
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StringRef t = to.toNullTerminatedStringRef(to_storage);
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if (::link(t.begin(), f.begin()) == -1)
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return error_code(errno, system_category());
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return make_error_code(errc::success);
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}
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error_code create_symlink(const Twine &to, const Twine &from) {
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// Get arguments.
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SmallString<128> from_storage;
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SmallString<128> to_storage;
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StringRef f = from.toNullTerminatedStringRef(from_storage);
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StringRef t = to.toNullTerminatedStringRef(to_storage);
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if (::symlink(t.begin(), f.begin()) == -1)
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return error_code(errno, system_category());
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return make_error_code(errc::success);
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}
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error_code exists(const Twine &path, bool &result) {
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SmallString<128> path_storage;
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StringRef p = path.toNullTerminatedStringRef(path_storage);
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struct stat status;
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if (::stat(p.begin(), &status) == -1) {
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if (errno != ENOENT)
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return error_code(errno, system_category());
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result = false;
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} else
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result = true;
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return make_error_code(errc::success);
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}
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error_code unique_file(const Twine &model, int &result_fd,
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SmallVectorImpl<char> &result_path) {
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SmallString<128> Model;
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model.toVector(Model);
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// Null terminate.
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Model.c_str();
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// Make model absolute by prepending a temp directory if it's not already.
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bool absolute;
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if (error_code ec = path::is_absolute(Twine(Model), absolute)) return ec;
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if (!absolute) {
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SmallString<128> TDir;
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if (error_code ec = TempDir(TDir)) return ec;
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if (error_code ec = path::append(TDir, Twine(Model))) return ec;
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Model.swap(TDir);
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}
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// Replace '%' with random chars. From here on, DO NOT modify model. It may be
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// needed if the randomly chosen path already exists.
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SmallString<128> RandomPath;
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RandomPath.reserve(Model.size() + 1);
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::srand(::time(NULL));
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retry_random_path:
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// This is opened here instead of above to make it easier to track when to
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// close it. Collisions should be rare enough for the possible extra syscalls
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// not to matter.
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FILE *RandomSource = ::fopen("/dev/urandom", "r");
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RandomPath.set_size(0);
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for (SmallVectorImpl<char>::const_iterator i = Model.begin(),
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e = Model.end(); i != e; ++i) {
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if (*i == '%') {
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char val = 0;
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if (RandomSource)
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val = fgetc(RandomSource);
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else
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val = ::rand();
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RandomPath.push_back("0123456789abcdef"[val & 15]);
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} else
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RandomPath.push_back(*i);
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}
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if (RandomSource)
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::fclose(RandomSource);
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// Try to open + create the file.
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rety_open_create:
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int RandomFD = ::open(RandomPath.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600);
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if (RandomFD == -1) {
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// If the file existed, try again, otherwise, error.
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if (errno == EEXIST)
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goto retry_random_path;
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// The path prefix doesn't exist.
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if (errno == ENOENT) {
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StringRef p(RandomPath.begin(), RandomPath.size());
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SmallString<64> dir_to_create;
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for (path::const_iterator i = path::begin(p),
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e = --path::end(p); i != e; ++i) {
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if (error_code ec = path::append(dir_to_create, *i)) return ec;
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bool Exists;
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if (error_code ec = exists(Twine(dir_to_create), Exists)) return ec;
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if (!Exists) {
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// Don't try to create network paths.
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if (i->size() > 2 && (*i)[0] == '/' &&
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(*i)[1] == '/' &&
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(*i)[2] != '/')
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return error_code(ENOENT, system_category());
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if (::mkdir(dir_to_create.c_str(), 0700) == -1)
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return error_code(errno, system_category());
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}
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}
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goto rety_open_create;
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}
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return error_code(errno, system_category());
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}
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// Make the path absolute.
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char real_path_buff[PATH_MAX + 1];
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if (realpath(RandomPath.c_str(), real_path_buff) == NULL) {
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::close(RandomFD);
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::unlink(RandomPath.c_str());
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return error_code(errno, system_category());
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}
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result_path.set_size(0);
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StringRef d(real_path_buff);
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result_path.append(d.begin(), d.end());
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result_fd = RandomFD;
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return make_error_code(errc::success);
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}
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} // end namespace fs
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} // end namespace sys
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} // end namespace llvm
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