X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FSupport%2FFileSystem.h;h=800f4ebe7a32a581d4d6d6651b5033808a5e69da;hb=c1b49b56d4132efa2e06deb8f23508d0de4c8800;hp=bffc234f93db423841589928128c8456f8e868d0;hpb=a2ea78f1320c08018e28f82f8fb543fa7b4bb52d;p=oota-llvm.git diff --git a/include/llvm/Support/FileSystem.h b/include/llvm/Support/FileSystem.h index bffc234f93d..800f4ebe7a3 100644 --- a/include/llvm/Support/FileSystem.h +++ b/include/llvm/Support/FileSystem.h @@ -24,8 +24,8 @@ // //===----------------------------------------------------------------------===// -#ifndef LLVM_SUPPORT_FILE_SYSTEM_H -#define LLVM_SUPPORT_FILE_SYSTEM_H +#ifndef LLVM_SUPPORT_FILESYSTEM_H +#define LLVM_SUPPORT_FILESYSTEM_H #include "llvm/ADT/IntrusiveRefCntPtr.h" #include "llvm/ADT/OwningPtr.h" @@ -33,6 +33,7 @@ #include "llvm/ADT/Twine.h" #include "llvm/Support/DataTypes.h" #include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/TimeValue.h" #include "llvm/Support/system_error.h" #include #include @@ -40,7 +41,7 @@ #include #include -#if HAVE_SYS_STAT_H +#ifdef HAVE_SYS_STAT_H #include #endif @@ -95,30 +96,28 @@ struct space_info { uint64_t available; }; - enum perms { - no_perms = 0, - owner_read = 0400, - owner_write = 0200, - owner_exe = 0100, - owner_all = owner_read | owner_write | owner_exe, - group_read = 040, - group_write = 020, - group_exe = 010, - group_all = group_read | group_write | group_exe, - others_read = 04, - others_write = 02, - others_exe = 01, - others_all = others_read | others_write | others_exe, - all_all = owner_all | group_all | others_all, - set_uid_on_exe = 04000, - set_gid_on_exe = 02000, - sticky_bit = 01000, - perms_mask = all_all | set_uid_on_exe | set_gid_on_exe | sticky_bit, - perms_not_known = 0xFFFF, - add_perms = 0x1000, - remove_perms = 0x2000, - symlink_perms = 0x4000 + no_perms = 0, + owner_read = 0400, + owner_write = 0200, + owner_exe = 0100, + owner_all = owner_read | owner_write | owner_exe, + group_read = 040, + group_write = 020, + group_exe = 010, + group_all = group_read | group_write | group_exe, + others_read = 04, + others_write = 02, + others_exe = 01, + others_all = others_read | others_write | others_exe, + all_read = owner_read | group_read | others_read, + all_write = owner_write | group_write | others_write, + all_exe = owner_exe | group_exe | others_exe, + all_all = owner_all | group_all | others_all, + set_uid_on_exe = 04000, + set_gid_on_exe = 02000, + sticky_bit = 01000, + perms_not_known = 0xFFFF }; // Helper functions so that you can use & and | to manipulate perms bits: @@ -151,6 +150,10 @@ class file_status #if defined(LLVM_ON_UNIX) dev_t fs_st_dev; ino_t fs_st_ino; + time_t fs_st_mtime; + uid_t fs_st_uid; + gid_t fs_st_gid; + off_t fs_st_size; #elif defined (LLVM_ON_WIN32) uint32_t LastWriteTimeHigh; uint32_t LastWriteTimeLow; @@ -161,18 +164,51 @@ class file_status uint32_t FileIndexLow; #endif friend bool equivalent(file_status A, file_status B); - friend error_code status(const Twine &path, file_status &result); + friend error_code getUniqueID(const Twine Path, uint64_t &Result); file_type Type; perms Perms; public: - explicit file_status(file_type v=file_type::status_error, - perms prms=perms_not_known) - : Type(v), Perms(prms) {} + file_status() : Type(file_type::status_error) {} + file_status(file_type Type) : Type(Type) {} + + #if defined(LLVM_ON_UNIX) + file_status(file_type Type, perms Perms, dev_t Dev, ino_t Ino, time_t MTime, + uid_t UID, gid_t GID, off_t Size) + : fs_st_dev(Dev), fs_st_ino(Ino), fs_st_mtime(MTime), fs_st_uid(UID), + fs_st_gid(GID), fs_st_size(Size), Type(Type), Perms(Perms) {} + #elif defined(LLVM_ON_WIN32) + file_status(file_type Type, uint32_t LastWriteTimeHigh, + uint32_t LastWriteTimeLow, uint32_t VolumeSerialNumber, + uint32_t FileSizeHigh, uint32_t FileSizeLow, + uint32_t FileIndexHigh, uint32_t FileIndexLow) + : LastWriteTimeHigh(LastWriteTimeHigh), + LastWriteTimeLow(LastWriteTimeLow), + VolumeSerialNumber(VolumeSerialNumber), FileSizeHigh(FileSizeHigh), + FileSizeLow(FileSizeLow), FileIndexHigh(FileIndexHigh), + FileIndexLow(FileIndexLow), Type(Type), Perms(perms_not_known) {} + #endif // getters file_type type() const { return Type; } perms permissions() const { return Perms; } - + TimeValue getLastModificationTime() const; + + #if defined(LLVM_ON_UNIX) + uint32_t getUser() const { return fs_st_uid; } + uint32_t getGroup() const { return fs_st_gid; } + uint64_t getSize() const { return fs_st_size; } + #elif defined (LLVM_ON_WIN32) + uint32_t getUser() const { + return 9999; // Not applicable to Windows, so... + } + uint32_t getGroup() const { + return 9999; // Not applicable to Windows, so... + } + uint64_t getSize() const { + return (uint64_t(FileSizeHigh) << 32) + FileSizeLow; + } + #endif + // setters void type(file_type v) { Type = v; } void permissions(perms p) { Perms = p; } @@ -181,7 +217,7 @@ public: /// file_magic - An "enum class" enumeration of file types based on magic (the first /// N bytes of the file). struct file_magic { - enum _ { + enum Impl { unknown = 0, ///< Unrecognized file bitcode, ///< Bitcode file archive, ///< ar style archive file @@ -193,27 +229,27 @@ struct file_magic { macho_executable, ///< Mach-O Executable macho_fixed_virtual_memory_shared_lib, ///< Mach-O Shared Lib, FVM macho_core, ///< Mach-O Core File - macho_preload_executabl, ///< Mach-O Preloaded Executable + macho_preload_executable, ///< Mach-O Preloaded Executable macho_dynamically_linked_shared_lib, ///< Mach-O dynlinked shared lib macho_dynamic_linker, ///< The Mach-O dynamic linker macho_bundle, ///< Mach-O Bundle file macho_dynamically_linked_shared_lib_stub, ///< Mach-O Shared lib stub macho_dsym_companion, ///< Mach-O dSYM companion file + macho_universal_binary, ///< Mach-O universal binary coff_object, ///< COFF object file pecoff_executable ///< PECOFF executable file }; bool is_object() const { - return v_ == unknown ? false : true; + return V == unknown ? false : true; } - file_magic() : v_(unknown) {} - file_magic(_ v) : v_(v) {} - explicit file_magic(int v) : v_(_(v)) {} - operator int() const {return v_;} + file_magic() : V(unknown) {} + file_magic(Impl V) : V(V) {} + operator Impl() const { return V; } private: - int v_; + Impl V; }; /// @} @@ -253,6 +289,13 @@ error_code copy_file(const Twine &from, const Twine &to, /// otherwise a platform specific error_code. error_code create_directories(const Twine &path, bool &existed); +/// @brief Convenience function for clients that don't need to know if the +/// directory existed or not. +inline error_code create_directories(const Twine &Path) { + bool Existed; + return create_directories(Path, Existed); +} + /// @brief Create the directory in path. /// /// @param path Directory to create. @@ -261,6 +304,13 @@ error_code create_directories(const Twine &path, bool &existed); /// otherwise a platform specific error_code. error_code create_directory(const Twine &path, bool &existed); +/// @brief Convenience function for clients that don't need to know if the +/// directory existed or not. +inline error_code create_directory(const Twine &Path) { + bool Existed; + return create_directory(Path, Existed); +} + /// @brief Create a hard link from \a from to \a to. /// /// @param to The path to hard link to. @@ -280,7 +330,7 @@ error_code create_symlink(const Twine &to, const Twine &from); /// @brief Get the current path. /// /// @param result Holds the current path on return. -/// @results errc::success if the current path has been stored in result, +/// @returns errc::success if the current path has been stored in result, /// otherwise a platform specific error_code. error_code current_path(SmallVectorImpl &result); @@ -289,19 +339,33 @@ error_code current_path(SmallVectorImpl &result); /// @param path Input path. /// @param existed Set to true if \a path existed, false if it did not. /// undefined otherwise. -/// @results errc::success if path has been removed and existed has been +/// @returns errc::success if path has been removed and existed has been /// successfully set, otherwise a platform specific error_code. error_code remove(const Twine &path, bool &existed); +/// @brief Convenience function for clients that don't need to know if the file +/// existed or not. +inline error_code remove(const Twine &Path) { + bool Existed; + return remove(Path, Existed); +} + /// @brief Recursively remove all files below \a path, then \a path. Files are /// removed as if by POSIX remove(). /// /// @param path Input path. /// @param num_removed Number of files removed. -/// @results errc::success if path has been removed and num_removed has been +/// @returns errc::success if path has been removed and num_removed has been /// successfully set, otherwise a platform specific error_code. error_code remove_all(const Twine &path, uint32_t &num_removed); +/// @brief Convenience function for clients that don't need to know how many +/// files were removed. +inline error_code remove_all(const Twine &Path) { + uint32_t Removed; + return remove_all(Path, Removed); +} + /// @brief Rename \a from to \a to. Files are renamed as if by POSIX rename(). /// /// @param from The path to rename from. @@ -323,7 +387,7 @@ error_code resize_file(const Twine &path, uint64_t size); /// @brief Does file exist? /// /// @param status A file_status previously returned from stat. -/// @results True if the file represented by status exists, false if it does +/// @returns True if the file represented by status exists, false if it does /// not. bool exists(file_status status); @@ -332,7 +396,7 @@ bool exists(file_status status); /// @param path Input path. /// @param result Set to true if the file represented by status exists, false if /// it does not. Undefined otherwise. -/// @results errc::success if result has been successfully set, otherwise a +/// @returns errc::success if result has been successfully set, otherwise a /// platform specific error_code. error_code exists(const Twine &path, bool &result); @@ -343,6 +407,18 @@ inline bool exists(const Twine &path) { return !exists(path, result) && result; } +/// @brief Can we execute this file? +/// +/// @param Path Input path. +/// @returns True if we can execute it, false otherwise. +bool can_execute(const Twine &Path); + +/// @brief Can we write this file? +/// +/// @param Path Input path. +/// @returns True if we can write to it, false otherwise. +bool can_write(const Twine &Path); + /// @brief Do file_status's represent the same thing? /// /// @param A Input file_status. @@ -350,7 +426,7 @@ inline bool exists(const Twine &path) { /// /// assert(status_known(A) || status_known(B)); /// -/// @results True if A and B both represent the same file system entity, false +/// @returns True if A and B both represent the same file system entity, false /// otherwise. bool equivalent(file_status A, file_status B); @@ -362,7 +438,7 @@ bool equivalent(file_status A, file_status B); /// @param B Input path B. /// @param result Set to true if stat(A) and stat(B) have the same device and /// inode (or equivalent). -/// @results errc::success if result has been successfully set, otherwise a +/// @returns errc::success if result has been successfully set, otherwise a /// platform specific error_code. error_code equivalent(const Twine &A, const Twine &B, bool &result); @@ -373,18 +449,10 @@ inline bool equivalent(const Twine &A, const Twine &B) { return !equivalent(A, B, result) && result; } -/// @brief Get file size. -/// -/// @param path Input path. -/// @param result Set to the size of the file in \a path. -/// @returns errc::success if result has been successfully set, otherwise a -/// platform specific error_code. -error_code file_size(const Twine &path, uint64_t &result); - /// @brief Does status represent a directory? /// /// @param status A file_status previously returned from status. -/// @results status.type() == file_type::directory_file. +/// @returns status.type() == file_type::directory_file. bool is_directory(file_status status); /// @brief Is path a directory? @@ -392,14 +460,14 @@ bool is_directory(file_status status); /// @param path Input path. /// @param result Set to true if \a path is a directory, false if it is not. /// Undefined otherwise. -/// @results errc::success if result has been successfully set, otherwise a +/// @returns errc::success if result has been successfully set, otherwise a /// platform specific error_code. error_code is_directory(const Twine &path, bool &result); /// @brief Does status represent a regular file? /// /// @param status A file_status previously returned from status. -/// @results status_known(status) && status.type() == file_type::regular_file. +/// @returns status_known(status) && status.type() == file_type::regular_file. bool is_regular_file(file_status status); /// @brief Is path a regular file? @@ -407,15 +475,24 @@ bool is_regular_file(file_status status); /// @param path Input path. /// @param result Set to true if \a path is a regular file, false if it is not. /// Undefined otherwise. -/// @results errc::success if result has been successfully set, otherwise a +/// @returns errc::success if result has been successfully set, otherwise a /// platform specific error_code. error_code is_regular_file(const Twine &path, bool &result); +/// @brief Simpler version of is_regular_file for clients that don't need to +/// differentiate between an error and false. +inline bool is_regular_file(const Twine &Path) { + bool Result; + if (is_regular_file(Path, Result)) + return false; + return Result; +} + /// @brief Does this status represent something that exists but is not a /// directory, regular file, or symlink? /// /// @param status A file_status previously returned from status. -/// @results exists(s) && !is_regular_file(s) && !is_directory(s) && +/// @returns exists(s) && !is_regular_file(s) && !is_directory(s) && /// !is_symlink(s) bool is_other(file_status status); @@ -425,7 +502,7 @@ bool is_other(file_status status); /// @param path Input path. /// @param result Set to true if \a path exists, but is not a directory, regular /// file, or a symlink, false if it does not. Undefined otherwise. -/// @results errc::success if result has been successfully set, otherwise a +/// @returns errc::success if result has been successfully set, otherwise a /// platform specific error_code. error_code is_other(const Twine &path, bool &result); @@ -440,7 +517,7 @@ bool is_symlink(file_status status); /// @param path Input path. /// @param result Set to true if \a path is a symlink, false if it is not. /// Undefined otherwise. -/// @results errc::success if result has been successfully set, otherwise a +/// @returns errc::success if result has been successfully set, otherwise a /// platform specific error_code. error_code is_symlink(const Twine &path, bool &result); @@ -448,53 +525,122 @@ error_code is_symlink(const Twine &path, bool &result); /// /// @param path Input path. /// @param result Set to the file status. -/// @results errc::success if result has been successfully set, otherwise a +/// @returns errc::success if result has been successfully set, otherwise a /// platform specific error_code. error_code status(const Twine &path, file_status &result); -/// @brief Modifies permission bits on a file +/// @brief A version for when a file descriptor is already available. +error_code status(int FD, file_status &Result); + +/// @brief Get file size. /// -/// @param path Input path. -/// @results errc::success if permissions have been changed, otherwise a +/// @param Path Input path. +/// @param Result Set to the size of the file in \a Path. +/// @returns errc::success if result has been successfully set, otherwise a /// platform specific error_code. -error_code permissions(const Twine &path, perms prms); +inline error_code file_size(const Twine &Path, uint64_t &Result) { + file_status Status; + error_code EC = status(Path, Status); + if (EC) + return EC; + Result = Status.getSize(); + return error_code::success(); +} + +error_code setLastModificationAndAccessTime(int FD, TimeValue Time); /// @brief Is status available? /// /// @param s Input file status. -/// @results True if status() != status_error. +/// @returns True if status() != status_error. bool status_known(file_status s); /// @brief Is status available? /// /// @param path Input path. /// @param result Set to true if status() != status_error. -/// @results errc::success if result has been successfully set, otherwise a +/// @returns errc::success if result has been successfully set, otherwise a /// platform specific error_code. error_code status_known(const Twine &path, bool &result); -/// @brief Generate a unique path and open it as a file. +/// @brief Create a uniquely named file. /// /// Generates a unique path suitable for a temporary file and then opens it as a /// file. The name is based on \a model with '%' replaced by a random char in /// [0-9a-f]. If \a model is not an absolute path, a suitable temporary /// directory will be prepended. /// +/// Example: clang-%%-%%-%%-%%-%%.s => clang-a0-b1-c2-d3-e4.s +/// /// This is an atomic operation. Either the file is created and opened, or the /// file system is left untouched. /// -/// clang-%%-%%-%%-%%-%%.s => /tmp/clang-a0-b1-c2-d3-e4.s +/// The intendend use is for files that are to be kept, possibly after +/// renaming them. For example, when running 'clang -c foo.o', the file can +/// be first created as foo-abc123.o and then renamed. /// -/// @param model Name to base unique path off of. -/// @param result_fd Set to the opened file's file descriptor. -/// @param result_path Set to the opened file's absolute path. -/// @param makeAbsolute If true and @model is not an absolute path, a temp -/// directory will be prepended. -/// @results errc::success if result_{fd,path} have been successfully set, +/// @param Model Name to base unique path off of. +/// @param ResultFD Set to the opened file's file descriptor. +/// @param ResultPath Set to the opened file's absolute path. +/// @returns errc::success if Result{FD,Path} have been successfully set, /// otherwise a platform specific error_code. -error_code unique_file(const Twine &model, int &result_fd, - SmallVectorImpl &result_path, - bool makeAbsolute = true, unsigned mode = 0600); +error_code createUniqueFile(const Twine &Model, int &ResultFD, + SmallVectorImpl &ResultPath, + unsigned Mode = all_read | all_write); + +/// @brief Simpler version for clients that don't want an open file. +error_code createUniqueFile(const Twine &Model, + SmallVectorImpl &ResultPath); + +/// @brief Create a file in the system temporary directory. +/// +/// The filename is of the form prefix-random_chars.suffix. Since the directory +/// is not know to the caller, Prefix and Suffix cannot have path separators. +/// The files are created with mode 0600. +/// +/// This should be used for things like a temporary .s that is removed after +/// running the assembler. +error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix, + int &ResultFD, + SmallVectorImpl &ResultPath); + +/// @brief Simpler version for clients that don't want an open file. +error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix, + SmallVectorImpl &ResultPath); + +error_code createUniqueDirectory(const Twine &Prefix, + SmallVectorImpl &ResultPath); + +enum OpenFlags { + F_None = 0, + + /// F_Excl - When opening a file, this flag makes raw_fd_ostream + /// report an error if the file already exists. + F_Excl = 1, + + /// F_Append - When opening a file, if it already exists append to the + /// existing file instead of returning an error. This may not be specified + /// with F_Excl. + F_Append = 2, + + /// F_Binary - The file should be opened in binary mode on platforms that + /// make this distinction. + F_Binary = 4 +}; + +inline OpenFlags operator|(OpenFlags A, OpenFlags B) { + return OpenFlags(unsigned(A) | unsigned(B)); +} + +inline OpenFlags &operator|=(OpenFlags &A, OpenFlags B) { + A = A | B; + return A; +} + +error_code openFileForWrite(const Twine &Name, int &ResultFD, OpenFlags Flags, + unsigned Mode = 0666); + +error_code openFileForRead(const Twine &Name, int &ResultFD); /// @brief Canonicalize path. /// @@ -503,7 +649,7 @@ error_code unique_file(const Twine &model, int &result_fd, /// /// @param path Input path. /// @param result Set to the canonicalized version of \a path. -/// @results errc::success if result has been successfully set, otherwise a +/// @returns errc::success if result has been successfully set, otherwise a /// platform specific error_code. error_code canonicalize(const Twine &path, SmallVectorImpl &result); @@ -511,7 +657,7 @@ error_code canonicalize(const Twine &path, SmallVectorImpl &result); /// /// @param path Input path. /// @param magic Byte sequence to compare \a path's first len(magic) bytes to. -/// @results errc::success if result has been successfully set, otherwise a +/// @returns errc::success if result has been successfully set, otherwise a /// platform specific error_code. error_code has_magic(const Twine &path, const Twine &magic, bool &result); @@ -522,7 +668,7 @@ error_code has_magic(const Twine &path, const Twine &magic, bool &result); /// @param result Set to the first \a len bytes in the file pointed to by /// \a path. Or the entire file if file_size(path) < len, in which /// case result.size() returns the size of the file. -/// @results errc::success if result has been successfully set, +/// @returns errc::success if result has been successfully set, /// errc::value_too_large if len is larger then the file pointed to by /// \a path, otherwise a platform specific error_code. error_code get_magic(const Twine &path, uint32_t len, @@ -534,48 +680,12 @@ file_magic identify_magic(StringRef magic); /// @brief Get and identify \a path's type based on its content. /// /// @param path Input path. -/// @param result Set to the type of file, or LLVMFileType::Unknown_FileType. -/// @results errc::success if result has been successfully set, otherwise a +/// @param result Set to the type of file, or file_magic::unknown. +/// @returns errc::success if result has been successfully set, otherwise a /// platform specific error_code. error_code identify_magic(const Twine &path, file_magic &result); -/// @brief Get library paths the system linker uses. -/// -/// @param result Set to the list of system library paths. -/// @results errc::success if result has been successfully set, otherwise a -/// platform specific error_code. -error_code GetSystemLibraryPaths(SmallVectorImpl &result); - -/// @brief Get bitcode library paths the system linker uses -/// + LLVM_LIB_SEARCH_PATH + LLVM_LIBDIR. -/// -/// @param result Set to the list of bitcode library paths. -/// @results errc::success if result has been successfully set, otherwise a -/// platform specific error_code. -error_code GetBitcodeLibraryPaths(SmallVectorImpl &result); - -/// @brief Find a library. -/// -/// Find the path to a library using its short name. Use the system -/// dependent library paths to locate the library. -/// -/// c => /usr/lib/libc.so -/// -/// @param short_name Library name one would give to the system linker. -/// @param result Set to the absolute path \a short_name represents. -/// @results errc::success if result has been successfully set, otherwise a -/// platform specific error_code. -error_code FindLibrary(const Twine &short_name, SmallVectorImpl &result); - -/// @brief Get absolute path of main executable. -/// -/// @param argv0 The program name as it was spelled on the command line. -/// @param MainAddr Address of some symbol in the executable (not in a library). -/// @param result Set to the absolute path of the current executable. -/// @results errc::success if result has been successfully set, otherwise a -/// platform specific error_code. -error_code GetMainExecutable(const char *argv0, void *MainAddr, - SmallVectorImpl &result); +error_code getUniqueID(const Twine Path, uint64_t &Result); /// This class represents a memory mapped file. It is based on /// boost::iostreams::mapped_file. @@ -596,18 +706,18 @@ private: mapmode Mode; uint64_t Size; void *Mapping; -#if LLVM_ON_WIN32 +#ifdef LLVM_ON_WIN32 int FileDescriptor; void *FileHandle; void *FileMappingHandle; #endif - error_code init(int FD, uint64_t Offset); + error_code init(int FD, bool CloseFD, uint64_t Offset); public: typedef char char_type; -#if LLVM_USE_RVALUE_REFERENCES +#if LLVM_HAS_RVALUE_REFERENCES mapped_file_region(mapped_file_region&&); mapped_file_region &operator =(mapped_file_region&&); #endif @@ -633,8 +743,10 @@ public: error_code &ec); /// \param fd An open file descriptor to map. mapped_file_region takes - /// ownership. It must have been opended in the correct mode. + /// ownership if closefd is true. It must have been opended in the correct + /// mode. mapped_file_region(int fd, + bool closefd, mapmode mode, uint64_t length, uint64_t offset, @@ -647,7 +759,7 @@ public: char *data() const; /// Get a const view of the data. Modifying this memory has undefined - /// behaivor. + /// behavior. const char *const_data() const; /// \returns The minimum alignment offset must be. @@ -664,7 +776,7 @@ public: /// to the file. If false, the file will be mapped read-only /// and the buffer will be read-only. /// @param result Set to the start address of the mapped buffer. -/// @results errc::success if result has been successfully set, otherwise a +/// @returns errc::success if result has been successfully set, otherwise a /// platform specific error_code. error_code map_file_pages(const Twine &path, off_t file_offset, size_t size, bool map_writable, void *&result); @@ -674,11 +786,14 @@ error_code map_file_pages(const Twine &path, off_t file_offset, size_t size, /// /// @param base Pointer to the start of the buffer. /// @param size Byte length of the range to unmmap. -/// @results errc::success if result has been successfully set, otherwise a +/// @returns errc::success if result has been successfully set, otherwise a /// platform specific error_code. error_code unmap_file_pages(void *base, size_t size); - +/// Return the path to the main executable, given the value of argv[0] from +/// program startup and the address of main itself. In extremis, this function +/// may fail and return an empty path. +std::string getMainExecutable(const char *argv0, void *MainExecAddr); /// @} /// @name Iterators