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
31 using namespace lldb;
32 using namespace lldb_private;
33
34 const char *FileSystem::DEV_NULL = "/dev/null";
35
Symlink(const FileSpec & src,const FileSpec & dst)36 Status FileSystem::Symlink(const FileSpec &src, const FileSpec &dst) {
37 Status error;
38 if (::symlink(dst.GetPath().c_str(), src.GetPath().c_str()) == -1)
39 error.SetErrorToErrno();
40 return error;
41 }
42
Readlink(const FileSpec & src,FileSpec & dst)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
ResolveSymbolicLink(const FileSpec & src,FileSpec & dst)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",
60 src.GetPath().c_str());
61 }
62
63 char real_path[PATH_MAX + 1];
64 if (realpath(resolved_path, 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
Fopen(const char * path,const char * mode)75 FILE *FileSystem::Fopen(const char *path, const char *mode) {
76 return llvm::sys::RetryAfterSignal(nullptr, ::fopen, path, mode);
77 }
78
Open(const char * path,int flags,int mode)79 int 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(path, flags, mode); };
83 return llvm::sys::RetryAfterSignal(-1, lambda);
84 }
85