namespace sys {
-class self_process;
-
-/// \brief Generic base class which exposes information about an operating
-/// system process.
-///
-/// This base class is the core interface behind any OS process. It exposes
-/// methods to query for generic information about a particular process.
-///
-/// Subclasses implement this interface based on the mechanisms available, and
-/// can optionally expose more interfaces unique to certain process kinds.
-class process {
-protected:
- /// \brief Only specific subclasses of process objects can be destroyed.
- virtual ~process();
-
-public:
- /// \brief Operating system specific type to identify a process.
- ///
- /// Note that the windows one is defined to 'unsigned long' as this is the
- /// documented type for DWORD on windows, and we don't want to pull in the
- /// Windows headers here.
-#if defined(LLVM_ON_UNIX)
- typedef pid_t id_type;
-#elif defined(LLVM_ON_WIN32)
- typedef unsigned long id_type; // Must match the type of DWORD.
-#else
-#error Unsupported operating system.
-#endif
-
- /// \brief Get the operating system specific identifier for this process.
- virtual id_type get_id() = 0;
-
- /// \brief Get the user time consumed by this process.
- ///
- /// Note that this is often an approximation and may be zero on platforms
- /// where we don't have good support for the functionality.
- virtual TimeValue get_user_time() const = 0;
-
- /// \brief Get the system time consumed by this process.
- ///
- /// Note that this is often an approximation and may be zero on platforms
- /// where we don't have good support for the functionality.
- virtual TimeValue get_system_time() const = 0;
-
- /// \brief Get the wall time consumed by this process.
- ///
- /// Note that this is often an approximation and may be zero on platforms
- /// where we don't have good support for the functionality.
- virtual TimeValue get_wall_time() const = 0;
-
- /// \name Static factory routines for processes.
- /// @{
-
- /// \brief Get the process object for the current process.
- static self_process *get_self();
-
- /// @}
-
-};
-
-/// \brief The specific class representing the current process.
-///
-/// The current process can both specialize the implementation of the routines
-/// and can expose certain information not available for other OS processes.
-class self_process : public process {
- friend class process;
-
- /// \brief Private destructor, as users shouldn't create objects of this
- /// type.
- virtual ~self_process();
-
-public:
- id_type get_id() override;
- TimeValue get_user_time() const override;
- TimeValue get_system_time() const override;
- TimeValue get_wall_time() const override;
-
- /// \name Process configuration (sysconf on POSIX)
- /// @{
-
- /// \brief Get the virtual memory page size.
- ///
- /// Query the operating system for this process's page size.
- size_t page_size() const { return PageSize; };
-
- /// @}
-
-private:
- /// \name Cached process state.
- /// @{
-
- /// \brief Cached page size, this cannot vary during the life of the process.
- size_t PageSize;
-
- /// @}
-
- /// \brief Constructor, used by \c process::get_self() only.
- self_process();
-};
-
/// \brief A collection of legacy interfaces for querying information about the
/// current executing process.
class Process {
public:
+ static unsigned getPageSize();
+
/// \brief Return process memory usage.
/// This static function will return the total amount of memory allocated
/// by the process. This only counts the memory allocated via the malloc,
ArrayRef<const char *> ArgsFromMain,
SpecificBumpPtrAllocator<char> &ArgAllocator);
+ // This functions ensures that the standard file descriptors (input, output,
+ // and error) are properly mapped to a file descriptor before we use any of
+ // them. This should only be called by standalone programs, library
+ // components should not call this.
+ static std::error_code FixupStandardFileDescriptors();
+
+ // This function safely closes a file descriptor. It is not safe to retry
+ // close(2) when it returns with errno equivalent to EINTR; this is because
+ // *nixen cannot agree if the file descriptor is, in fact, closed when this
+ // occurs.
+ //
+ // N.B. Some operating systems, due to thread cancellation, cannot properly
+ // guarantee that it will or will not be closed one way or the other!
+ static std::error_code SafelyCloseFileDescriptor(int FD);
+
/// This function determines if the standard input is connected directly
/// to a user's input (keyboard probably), rather than coming from a file
/// or pipe.
projects / oota-llvm.git / blobdiff