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FileSystemPosix.cpp
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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"
27 
28 #include "llvm/Support/Errno.h"
29 #include "llvm/Support/FileSystem.h"
30 
31 using namespace lldb;
32 using namespace lldb_private;
33 
34 const char *FileSystem::DEV_NULL = "/dev/null";
35 
36 Status FileSystem::Symlink(const FileSpec &src, const FileSpec &dst) {
37  Status error;
38  if (::symlink(dst.GetCString(), src.GetCString()) == -1)
39  error.SetErrorToErrno();
40  return error;
41 }
42 
43 Status FileSystem::Readlink(const FileSpec &src, FileSpec &dst) {
44  Status error;
45  char buf[PATH_MAX];
46  ssize_t count = ::readlink(src.GetPath().c_str(), buf, sizeof(buf) - 1);
47  if (count < 0)
48  error.SetErrorToErrno();
49  else {
50  buf[count] = '\0'; // Success
51  dst.SetFile(buf, FileSpec::Style::native);
52  }
53  return error;
54 }
55 
56 Status FileSystem::ResolveSymbolicLink(const FileSpec &src, FileSpec &dst) {
57  char resolved_path[PATH_MAX];
58  if (!src.GetPath(resolved_path, sizeof(resolved_path))) {
59  return Status("Couldn't get the canonical path for %s", src.GetCString());
60  }
61 
62  char real_path[PATH_MAX + 1];
63  if (realpath(resolved_path, real_path) == nullptr) {
64  Status err;
65  err.SetErrorToErrno();
66  return err;
67  }
68 
69  dst = FileSpec(real_path);
70 
71  return Status();
72 }
73 
74 FILE *FileSystem::Fopen(const char *path, const char *mode) {
75  Collect(path);
76  return llvm::sys::RetryAfterSignal(nullptr, ::fopen, path, mode);
77 }
78 
79 int FileSystem::Open(const char *path, int flags, int mode) {
80  Collect(path);
81  return llvm::sys::RetryAfterSignal(-1, ::open, path, flags, mode);
82 }
FileSystem.h
Host.h
lldb_private::FileSpec::GetCString
const char * GetCString(bool denormalize=true) const
Definition: FileSpec.cpp:364
lldb_private::FileSpec
Definition: FileSpec.h:56
error
static llvm::raw_ostream & error(Stream &strm)
Definition: CommandReturnObject.cpp:17
StreamString.h
lldb_private::Status
Definition: Status.h:44
lldb_private::Status::SetErrorToErrno
void SetErrorToErrno()
Set the current error to errno.
Definition: Status.cpp:224
Status.h
lldb_private
A class that represents a running process on the host machine.
Definition: SBCommandInterpreterRunOptions.h:16
lldb_private::FileSpec::SetFile
void SetFile(llvm::StringRef path, Style style)
Change the file specified with a new path.
Definition: FileSpec.cpp:174
PATH_MAX
#define PATH_MAX
Definition: windows/PosixApi.h:25
lldb_private::FileSpec::GetPath
size_t GetPath(char *path, size_t max_path_length, bool denormalize=true) const
Extract the full path to the file.
Definition: FileSpec.cpp:348
lldb
Definition: SBAddress.h:15