1//===-- FileSystemPosix.cpp -----------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "lldb/Host/FileSystem.h"
10
11// C includes
12#include <fcntl.h>
13#include <unistd.h>
14
15// lldb Includes
16#include "lldb/Host/Host.h"
17#include "lldb/Utility/Status.h"
18#include "lldb/Utility/StreamString.h"
19
20#include "llvm/Support/Errno.h"
21#include "llvm/Support/FileSystem.h"
22
23using namespace lldb;
24using namespace lldb_private;
25
26const char *FileSystem::DEV_NULL = "/dev/null";
27
28Status FileSystem::Symlink(const FileSpec &src, const FileSpec &dst) {
29 Status error;
30 if (::symlink(from: dst.GetPath().c_str(), to: src.GetPath().c_str()) == -1)
31 return Status::FromErrno();
32 return error;
33}
34
35Status FileSystem::Readlink(const FileSpec &src, FileSpec &dst) {
36 Status error;
37 char buf[PATH_MAX];
38 ssize_t count = ::readlink(path: src.GetPath().c_str(), buf: buf, len: sizeof(buf) - 1);
39 if (count < 0)
40 return Status::FromErrno();
41
42 buf[count] = '\0'; // Success
43 dst.SetFile(path: buf, style: FileSpec::Style::native);
44
45 return error;
46}
47
48Status FileSystem::ResolveSymbolicLink(const FileSpec &src, FileSpec &dst) {
49 char resolved_path[PATH_MAX];
50 if (!src.GetPath(path: resolved_path, max_path_length: sizeof(resolved_path))) {
51 return Status::FromErrorStringWithFormat(
52 format: "Couldn't get the canonical path for %s", src.GetPath().c_str());
53 }
54
55 char real_path[PATH_MAX + 1];
56 if (realpath(name: resolved_path, resolved: real_path) == nullptr) {
57 return Status::FromErrno();
58 }
59
60 dst = FileSpec(real_path);
61
62 return Status();
63}
64
65FILE *FileSystem::Fopen(const char *path, const char *mode) {
66 return llvm::sys::RetryAfterSignal(Fail: nullptr, F&: ::fopen, As: path, As: mode);
67}
68
69int FileSystem::Open(const char *path, int flags, int mode) {
70 // Call ::open in a lambda to avoid overload resolution in RetryAfterSignal
71 // when open is overloaded, such as in Bionic.
72 auto lambda = [&]() { return ::open(file: path, oflag: flags, mode); };
73 return llvm::sys::RetryAfterSignal(Fail: -1, F: lambda);
74}
75

source code of lldb/source/Host/posix/FileSystemPosix.cpp