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 <dirent.h>
13#include <fcntl.h>
14#include <sys/mount.h>
15#include <sys/param.h>
16#include <sys/stat.h>
17#include <sys/types.h>
18#include <unistd.h>
19#if defined(__NetBSD__)
20#include <sys/statvfs.h>
21#endif
22
23// lldb Includes
24#include "lldb/Host/Host.h"
25#include "lldb/Utility/Status.h"
26#include "lldb/Utility/StreamString.h"
27
28#include "llvm/Support/Errno.h"
29#include "llvm/Support/FileSystem.h"
30
31using namespace lldb;
32using namespace lldb_private;
33
34const char *FileSystem::DEV_NULL = "/dev/null";
35
36Status FileSystem::Symlink(const FileSpec &src, const FileSpec &dst) {
37 Status error;
38 if (::symlink(from: dst.GetPath().c_str(), to: src.GetPath().c_str()) == -1)
39 error.SetErrorToErrno();
40 return error;
41}
42
43Status FileSystem::Readlink(const FileSpec &src, FileSpec &dst) {
44 Status error;
45 char buf[PATH_MAX];
46 ssize_t count = ::readlink(path: src.GetPath().c_str(), buf: buf, len: sizeof(buf) - 1);
47 if (count < 0)
48 error.SetErrorToErrno();
49 else {
50 buf[count] = '\0'; // Success
51 dst.SetFile(path: buf, style: FileSpec::Style::native);
52 }
53 return error;
54}
55
56Status FileSystem::ResolveSymbolicLink(const FileSpec &src, FileSpec &dst) {
57 char resolved_path[PATH_MAX];
58 if (!src.GetPath(path: resolved_path, max_path_length: sizeof(resolved_path))) {
59 return Status("Couldn't get the canonical path for %s",
60 src.GetPath().c_str());
61 }
62
63 char real_path[PATH_MAX + 1];
64 if (realpath(name: resolved_path, resolved: real_path) == nullptr) {
65 Status err;
66 err.SetErrorToErrno();
67 return err;
68 }
69
70 dst = FileSpec(real_path);
71
72 return Status();
73}
74
75FILE *FileSystem::Fopen(const char *path, const char *mode) {
76 return llvm::sys::RetryAfterSignal(Fail: nullptr, F&: ::fopen, As: path, As: mode);
77}
78
79int FileSystem::Open(const char *path, int flags, int mode) {
80 // Call ::open in a lambda to avoid overload resolution in RetryAfterSignal
81 // when open is overloaded, such as in Bionic.
82 auto lambda = [&]() { return ::open(file: path, oflag: flags, mode); };
83 return llvm::sys::RetryAfterSignal(Fail: -1, F: lambda);
84}
85

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