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(dst.GetPath().c_str(), 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(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 56Status 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 75FILE *FileSystem::Fopen(const char *path, const char *mode) { 76 return llvm::sys::RetryAfterSignal(nullptr, ::fopen, path, 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(path, flags, mode); }; 83 return llvm::sys::RetryAfterSignal(-1, lambda); 84} 85