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
23 using namespace lldb;
24 using namespace lldb_private;
25
26 const char *FileSystem::DEV_NULL = "/dev/null";
27
Symlink(const FileSpec & src,const FileSpec & dst)28 Status FileSystem::Symlink(const FileSpec &src, const FileSpec &dst) {
29 Status error;
30 if (::symlink(dst.GetPath().c_str(), src.GetPath().c_str()) == -1)
31 return Status::FromErrno();
32 return error;
33 }
34
Readlink(const FileSpec & src,FileSpec & dst)35 Status FileSystem::Readlink(const FileSpec &src, FileSpec &dst) {
36 Status error;
37 char buf[PATH_MAX];
38 ssize_t count = ::readlink(src.GetPath().c_str(), buf, sizeof(buf) - 1);
39 if (count < 0)
40 return Status::FromErrno();
41
42 buf[count] = '\0'; // Success
43 dst.SetFile(buf, FileSpec::Style::native);
44
45 return error;
46 }
47
ResolveSymbolicLink(const FileSpec & src,FileSpec & dst)48 Status FileSystem::ResolveSymbolicLink(const FileSpec &src, FileSpec &dst) {
49 char resolved_path[PATH_MAX];
50 if (!src.GetPath(resolved_path, sizeof(resolved_path))) {
51 return Status::FromErrorStringWithFormat(
52 "Couldn't get the canonical path for %s", src.GetPath().c_str());
53 }
54
55 char real_path[PATH_MAX + 1];
56 if (realpath(resolved_path, real_path) == nullptr) {
57 return Status::FromErrno();
58 }
59
60 dst = FileSpec(real_path);
61
62 return Status();
63 }
64
Fopen(const char * path,const char * mode)65 FILE *FileSystem::Fopen(const char *path, const char *mode) {
66 return llvm::sys::RetryAfterSignal(nullptr, ::fopen, path, mode);
67 }
68
Open(const char * path,int flags,int mode)69 int 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(path, flags, mode); };
73 return llvm::sys::RetryAfterSignal(-1, lambda);
74 }
75