561 lines
25 KiB
Ada
561 lines
25 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- G N A T . O S _ L I B --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1995-2002 Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- Operating system interface facilities
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-- This package contains types and procedures for interfacing to the
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-- underlying OS. It is used by the GNAT compiler and by tools associated
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-- with the GNAT compiler, and therefore works for the various operating
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-- systems to which GNAT has been ported. This package will undoubtedly
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-- grow as new services are needed by various tools.
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-- This package tends to use fairly low-level Ada in order to not bring
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-- in large portions of the RTL. For example, functions return access
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-- to string as part of avoiding functions returning unconstrained types.
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-- Except where specifically noted, these routines are portable across
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-- all GNAT implementations on all supported operating systems.
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with System;
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with Unchecked_Deallocation;
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package GNAT.OS_Lib is
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pragma Elaborate_Body (OS_Lib);
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type String_Access is access all String;
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-- General purpose string access type. Some of the functions in this
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-- package allocate string results on the heap, and return a value of
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-- this type. Note that the caller is responsible for freeing this
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-- String to avoid memory leaks.
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procedure Free is new Unchecked_Deallocation
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(Object => String, Name => String_Access);
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-- This procedure is provided for freeing returned values of type
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-- String_Access
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type String_List is array (Positive range <>) of String_Access;
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type String_List_Access is access all String_List;
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-- General purpose array and pointer for list of string accesses
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procedure Free (Arg : in out String_List_Access);
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-- Frees the given array and all strings that its elements reference,
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-- and then sets the argument to null. Provided for freeing returned
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-- values of this type (including Argument_List_Access).
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---------------------
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-- Time/Date Stuff --
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---------------------
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-- The OS's notion of time is represented by the private type OS_Time.
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-- This is the type returned by the File_Time_Stamp functions to obtain
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-- the time stamp of a specified file. Functions and a procedure (modeled
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-- after the similar subprograms in package Calendar) are provided for
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-- extracting information from a value of this type. Although these are
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-- called GM, the intention is not that they provide GMT times in all
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-- cases but rather the actual (time-zone independent) time stamp of the
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-- file (of course in Unix systems, this *is* in GMT form).
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type OS_Time is private;
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subtype Year_Type is Integer range 1900 .. 2099;
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subtype Month_Type is Integer range 1 .. 12;
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subtype Day_Type is Integer range 1 .. 31;
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subtype Hour_Type is Integer range 0 .. 23;
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subtype Minute_Type is Integer range 0 .. 59;
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subtype Second_Type is Integer range 0 .. 59;
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function GM_Year (Date : OS_Time) return Year_Type;
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function GM_Month (Date : OS_Time) return Month_Type;
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function GM_Day (Date : OS_Time) return Day_Type;
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function GM_Hour (Date : OS_Time) return Hour_Type;
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function GM_Minute (Date : OS_Time) return Minute_Type;
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function GM_Second (Date : OS_Time) return Second_Type;
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procedure GM_Split
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(Date : OS_Time;
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Year : out Year_Type;
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Month : out Month_Type;
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Day : out Day_Type;
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Hour : out Hour_Type;
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Minute : out Minute_Type;
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Second : out Second_Type);
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----------------
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-- File Stuff --
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----------------
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-- These routines give access to the open/creat/close/read/write level
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-- of I/O routines in the typical C library (these functions are not
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-- part of the ANSI C standard, but are typically available in all
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-- systems). See also package Interfaces.C_Streams for access to the
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-- stream level routines.
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-- Note on file names. If a file name is passed as type String in any
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-- of the following specifications, then the name is a normal Ada string
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-- and need not be NUL-terminated. However, a trailing NUL character is
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-- permitted, and will be ignored (more accurately, the NUL and any
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-- characters that follow it will be ignored).
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type File_Descriptor is private;
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-- Corresponds to the int file handle values used in the C routines,
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Standin : constant File_Descriptor;
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Standout : constant File_Descriptor;
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Standerr : constant File_Descriptor;
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-- File descriptors for standard input output files
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Invalid_FD : constant File_Descriptor;
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-- File descriptor returned when error in opening/creating file;
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type Mode is (Binary, Text);
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for Mode'Size use Integer'Size;
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for Mode use (Binary => 0, Text => 1);
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-- Used in all the Open and Create calls to specify if the file is to be
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-- opened in binary mode or text mode. In systems like Unix, this has no
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-- effect, but in systems capable of text mode translation, the use of
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-- Text as the mode parameter causes the system to do CR/LF translation
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-- and also to recognize the DOS end of file character on input. The use
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-- of Text where appropriate allows programs to take a portable Unix view
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-- of DOs-format files and process them appropriately.
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function Open_Read
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(Name : String;
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Fmode : Mode)
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return File_Descriptor;
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-- Open file Name for reading, returning file descriptor File descriptor
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-- returned is Invalid_FD if file cannot be opened.
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function Open_Read_Write
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(Name : String;
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Fmode : Mode)
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return File_Descriptor;
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-- Open file Name for both reading and writing, returning file
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-- descriptor. File descriptor returned is Invalid_FD if file cannot be
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-- opened.
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function Create_File
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(Name : String;
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Fmode : Mode)
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return File_Descriptor;
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-- Creates new file with given name for writing, returning file descriptor
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-- for subsequent use in Write calls. File descriptor returned is
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-- Invalid_FD if file cannot be successfully created
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function Create_New_File
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(Name : String;
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Fmode : Mode)
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return File_Descriptor;
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-- Create new file with given name for writing, returning file descriptor
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-- for subsequent use in Write calls. This differs from Create_File in
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-- that it fails if the file already exists. File descriptor returned is
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-- Invalid_FD if the file exists or cannot be created.
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Temp_File_Len : constant Integer := 12;
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-- Length of name returned by Create_Temp_File call (GNAT-XXXXXX & NUL)
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subtype Temp_File_Name is String (1 .. Temp_File_Len);
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-- String subtype set by Create_Temp_File
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procedure Create_Temp_File
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(FD : out File_Descriptor;
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Name : out Temp_File_Name);
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-- Create and open for writing a temporary file. The name of the
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-- file and the File Descriptor are returned. The File Descriptor
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-- returned is Invalid_FD in the case of failure. No mode parameter
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-- is provided. Since this is a temporary file, there is no point in
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-- doing text translation on it.
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procedure Close (FD : File_Descriptor);
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pragma Import (C, Close, "close");
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-- Close file referenced by FD
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procedure Delete_File (Name : String; Success : out Boolean);
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-- Deletes file. Success is set True or False indicating if the delete is
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-- successful.
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procedure Rename_File
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(Old_Name : String;
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New_Name : String;
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Success : out Boolean);
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-- Rename a file. Success is set True or False indicating if the rename is
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-- successful.
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function Read
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(FD : File_Descriptor;
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A : System.Address;
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N : Integer)
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return Integer;
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pragma Import (C, Read, "read");
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-- Read N bytes to address A from file referenced by FD. Returned value
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-- is count of bytes actually read, which can be less than N at EOF.
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function Write
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(FD : File_Descriptor;
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A : System.Address;
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N : Integer)
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return Integer;
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pragma Import (C, Write, "write");
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-- Write N bytes from address A to file referenced by FD. The returned
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-- value is the number of bytes written, which can be less than N if
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-- a disk full condition was detected.
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Seek_Cur : constant := 1;
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Seek_End : constant := 2;
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Seek_Set : constant := 0;
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-- Used to indicate origin for Lseek call
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procedure Lseek
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(FD : File_Descriptor;
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offset : Long_Integer;
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origin : Integer);
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pragma Import (C, Lseek, "lseek");
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-- Sets the current file pointer to the indicated offset value,
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-- relative to the current position (origin = SEEK_CUR), end of
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-- file (origin = SEEK_END), or start of file (origin = SEEK_SET).
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function File_Length (FD : File_Descriptor) return Long_Integer;
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pragma Import (C, File_Length, "__gnat_file_length");
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-- Get length of file from file descriptor FD
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function File_Time_Stamp (Name : String) return OS_Time;
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-- Given the name of a file or directory, Name, obtains and returns the
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-- time stamp. This function can be used for an unopend file.
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function File_Time_Stamp (FD : File_Descriptor) return OS_Time;
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-- Get time stamp of file from file descriptor FD
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function Normalize_Pathname
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(Name : String;
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Directory : String := "")
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return String;
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-- Returns a file name as an absolute path name, resolving all relative
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-- directories, and symbolic links. The parameter Directory is a fully
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-- resolved path name for a directory, or the empty string (the default).
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-- Name is the name of a file, which is either relative to the given
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-- directory name, if Directory is non-null, or to the current working
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-- directory if Directory is null. The result returned is the normalized
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-- name of the file. For most cases, if two file names designate the same
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-- file through different paths, Normalize_Pathname will return the same
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-- canonical name in both cases. However, there are cases when this is
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-- not true; for example, this is not true in Unix for two hard links
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-- designating the same file.
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--
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-- If Name cannot be resolved or is null on entry (for example if there is
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-- a circularity in symbolic links: A is a symbolic link for B, while B is
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-- a symbolic link for A), then Normalize_Pathname returns an empty string.
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--
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-- In VMS, if Name follows the VMS syntax file specification, it is first
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-- converted into Unix syntax. If the conversion fails, Normalize_Pathname
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-- returns an empty string.
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function Is_Absolute_Path (Name : String) return Boolean;
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-- Returns True if Name is an absolute path name, i.e. it designates
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-- a directory absolutely, rather than relative to another directory.
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function Is_Regular_File (Name : String) return Boolean;
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-- Determines if the given string, Name, is the name of an existing
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-- regular file. Returns True if so, False otherwise.
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function Is_Directory (Name : String) return Boolean;
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-- Determines if the given string, Name, is the name of a directory.
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-- Returns True if so, False otherwise.
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function Is_Writable_File (Name : String) return Boolean;
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-- Determines if the given string, Name, is the name of an existing
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-- file that is writable. Returns True if so, False otherwise.
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function Locate_Exec_On_Path
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(Exec_Name : String)
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return String_Access;
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-- Try to locate an executable whose name is given by Exec_Name in the
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-- directories listed in the environment Path. If the Exec_Name doesn't
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-- have the executable suffix, it will be appended before the search.
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-- Otherwise works like Locate_Regular_File below.
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--
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-- Note that this function allocates some memory for the returned value.
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-- This memory needs to be deallocated after use.
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function Locate_Regular_File
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(File_Name : String;
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Path : String)
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return String_Access;
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-- Try to locate a regular file whose name is given by File_Name in the
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-- directories listed in Path. If a file is found, its full pathname is
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-- returned; otherwise, a null pointer is returned. If the File_Name given
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-- is an absolute pathname, then Locate_Regular_File just checks that the
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-- file exists and is a regular file. Otherwise, the Path argument is
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-- parsed according to OS conventions, and for each directory in the Path
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-- a check is made if File_Name is a relative pathname of a regular file
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-- from that directory.
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--
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-- Note that this function allocates some memory for the returned value.
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-- This memory needs to be deallocated after use.
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function Get_Debuggable_Suffix return String_Access;
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-- Return the debuggable suffix convention. Usually this is the same as
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-- the convention for Get_Executable_Suffix. The result is allocated on
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-- the heap and should be freed when no longer needed to avoid storage
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-- leaks.
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function Get_Executable_Suffix return String_Access;
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-- Return the executable suffix convention. The result is allocated on
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-- the heap and should be freed when no longer needed to avoid storage
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-- leaks.
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function Get_Object_Suffix return String_Access;
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-- Return the object suffix convention. The result is allocated on the
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-- heap and should be freed when no longer needed to avoid storage leaks.
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-- The following section contains low-level routines using addresses to
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-- pass file name and executable name. In each routine the name must be
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-- Nul-Terminated. For complete documentation refer to the equivalent
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-- routine (but using string) defined above.
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subtype C_File_Name is System.Address;
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-- This subtype is used to document that a parameter is the address
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-- of a null-terminated string containing the name of a file.
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function Open_Read
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(Name : C_File_Name;
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Fmode : Mode)
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return File_Descriptor;
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function Open_Read_Write
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(Name : C_File_Name;
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Fmode : Mode)
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return File_Descriptor;
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function Create_File
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(Name : C_File_Name;
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Fmode : Mode)
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return File_Descriptor;
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function Create_New_File
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(Name : C_File_Name;
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Fmode : Mode)
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return File_Descriptor;
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procedure Delete_File (Name : C_File_Name; Success : out Boolean);
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procedure Rename_File
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(Old_Name : C_File_Name;
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New_Name : C_File_Name;
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Success : out Boolean);
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function File_Time_Stamp (Name : C_File_Name) return OS_Time;
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function Is_Regular_File (Name : C_File_Name) return Boolean;
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function Is_Directory (Name : C_File_Name) return Boolean;
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function Is_Writable_File (Name : C_File_Name) return Boolean;
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function Locate_Regular_File
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(File_Name : C_File_Name;
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Path : C_File_Name)
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return String_Access;
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------------------
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-- Subprocesses --
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------------------
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subtype Argument_List is String_List;
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-- Type used for argument list in call to Spawn. The lower bound
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-- of the array should be 1, and the length of the array indicates
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-- the number of arguments.
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subtype Argument_List_Access is String_List_Access;
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-- Type used to return Argument_List without dragging in secondary stack.
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-- Note that there is a Free procedure declared for this subtype which
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-- frees the array and all referenced strings.
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procedure Normalize_Arguments (Args : in out Argument_List);
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-- Normalize all arguments in the list. This ensure that the argument list
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-- is compatible with the running OS and will works fine with Spawn and
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-- Non_Blocking_Spawn for example. If Normalize_Arguments is called twice
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-- on the same list it will do nothing the second time. Note that Spawn
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-- and Non_Blocking_Spawn call Normalize_Arguments automatically, but
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-- since there is a guarantee that a second call does nothing, this
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-- internal call with have no effect if Normalize_Arguments is called
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-- before calling Spawn. The call to Normalize_Arguments assumes that
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-- the individual referenced arguments in Argument_List are on the heap,
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-- and may free them and reallocate if they are modified.
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procedure Spawn
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(Program_Name : String;
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Args : Argument_List;
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Success : out Boolean);
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-- The first parameter of function Spawn is the name of the executable.
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-- The second parameter contains the arguments to be passed to the
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-- program. Success is False if the named program could not be spawned
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-- or its execution completed unsuccessfully. Note that the caller will
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-- be blocked until the execution of the spawned program is complete.
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-- For maximum portability, use a full path name for the Program_Name
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-- argument. On some systems (notably Unix systems) a simple file
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-- name may also work (if the executable can be located in the path).
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--
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-- Note: Arguments in Args that contain spaces and/or quotes such as
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-- "--GCC=gcc -v" or "--GCC=""gcc -v""" are not portable across all
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-- operating systems, and would not have the desired effect if they
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-- were passed directly to the operating system. To avoid this problem,
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-- Spawn makes an internal call to Normalize_Arguments, which ensures
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-- that such arguments are modified in a manner that ensures that the
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-- desired effect is obtained on all operating systems. The caller may
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-- call Normalize_Arguments explicitly before the call (e.g. to print
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-- out the exact form of arguments passed to the operating system). In
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-- this case the guarantee a second call to Normalize_Arguments has no
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-- effect ensures that the internal call will not affect the result.
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-- Note that the implicit call to Normalize_Arguments may free and
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-- reallocate some of the individual arguments.
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--
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-- This function will always set Success to False under VxWorks and
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-- other similar operating systems which have no notion of the concept
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-- of a dynamically executable file.
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function Spawn
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(Program_Name : String;
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Args : Argument_List)
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return Integer;
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-- Similar to the above procedure, but returns the actual status returned
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-- by the operating system, or -1 under VxWorks and any other similar
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-- operating systems which have no notion of separately spawnable programs.
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type Process_Id is private;
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-- A private type used to identify a process activated by the following
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-- non-blocking call. The only meaningful operation on this type is a
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-- comparison for equality.
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Invalid_Pid : constant Process_Id;
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-- A special value used to indicate errors, as described below.
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function Non_Blocking_Spawn
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(Program_Name : String;
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Args : Argument_List)
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return Process_Id;
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-- This is a non blocking call. The Process_Id of the spawned process
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-- is returned. Parameters are to be used as in Spawn. If Invalid_Id
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-- is returned the program could not be spawned.
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--
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-- This function will always return Invalid_Id under VxWorks, since
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-- there is no notion of executables under this OS.
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procedure Wait_Process (Pid : out Process_Id; Success : out Boolean);
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-- Wait for the completion of any of the processes created by previous
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-- calls to Non_Blocking_Spawn. The caller will be suspended until one
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-- of these processes terminates (normally or abnormally). If any of
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-- these subprocesses terminates prior to the call to Wait_Process (and
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-- has not been returned by a previous call to Wait_Process), then the
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-- call to Wait_Process is immediate. Pid identifies the process that
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-- has terminated (matching the value returned from Non_Blocking_Spawn).
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-- Success is set to True if this sub-process terminated successfully.
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-- If Pid = Invalid_Id, there were no subprocesses left to wait on.
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|
--
|
|
-- This function will always set success to False under VxWorks, since
|
|
-- there is no notion of executables under this OS.
|
|
|
|
function Argument_String_To_List
|
|
(Arg_String : String)
|
|
return Argument_List_Access;
|
|
-- Take a string that is a program and it's arguments and parse it into
|
|
-- an Argument_List. Note that the result is allocated on the heap, and
|
|
-- must be freed by the programmer (when it is no longer needed) to avoid
|
|
-- memory leaks.
|
|
|
|
-------------------
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|
-- Miscellaneous --
|
|
-------------------
|
|
|
|
function Getenv (Name : String) return String_Access;
|
|
-- Get the value of the environment variable. Returns an access
|
|
-- to the empty string if the environment variable does not exist
|
|
-- or has an explicit null value (in some operating systems these
|
|
-- are distinct cases, in others they are not; this interface
|
|
-- abstracts away that difference. The argument is allocated on
|
|
-- the heap (even in the null case), and needs to be freed explicitly
|
|
-- when no longer needed to avoid memory leaks.
|
|
|
|
procedure Setenv (Name : String; Value : String);
|
|
-- Set the value of the environment variable Name to Value. This call
|
|
-- modifies the current environment, but does not modify the parent
|
|
-- process environment. After a call to Setenv, Getenv (Name) will
|
|
-- always return a String_Access referencing the same String as Value.
|
|
-- This is true also for the null string case (the actual effect may
|
|
-- be to either set an explicit null as the value, or to remove the
|
|
-- entry, this is operating system dependent). Note that any following
|
|
-- calls to Spawn will pass an environment to the spawned process that
|
|
-- includes the changes made by Setenv calls. This procedure is not
|
|
-- available under VMS.
|
|
|
|
procedure OS_Exit (Status : Integer);
|
|
pragma Import (C, OS_Exit, "__gnat_os_exit");
|
|
pragma No_Return (OS_Exit);
|
|
-- Exit to OS with given status code (program is terminated)
|
|
|
|
procedure OS_Abort;
|
|
pragma Import (C, OS_Abort, "abort");
|
|
pragma No_Return (OS_Abort);
|
|
-- Exit to OS signalling an abort (traceback or other appropriate
|
|
-- diagnostic information should be given if possible, or entry made
|
|
-- to the debugger if that is possible).
|
|
|
|
function Errno return Integer;
|
|
pragma Import (C, Errno, "__get_errno");
|
|
-- Return the task-safe last error number.
|
|
|
|
procedure Set_Errno (Errno : Integer);
|
|
pragma Import (C, Set_Errno, "__set_errno");
|
|
-- Set the task-safe error number.
|
|
|
|
Directory_Separator : constant Character;
|
|
-- The character that is used to separate parts of a pathname.
|
|
|
|
Path_Separator : constant Character;
|
|
-- The character to separate paths in an environment variable value.
|
|
|
|
private
|
|
pragma Import (C, Path_Separator, "__gnat_path_separator");
|
|
pragma Import (C, Directory_Separator, "__gnat_dir_separator");
|
|
|
|
type OS_Time is new Integer;
|
|
|
|
type File_Descriptor is new Integer;
|
|
|
|
Standin : constant File_Descriptor := 0;
|
|
Standout : constant File_Descriptor := 1;
|
|
Standerr : constant File_Descriptor := 2;
|
|
Invalid_FD : constant File_Descriptor := -1;
|
|
|
|
type Process_Id is new Integer;
|
|
Invalid_Pid : constant Process_Id := -1;
|
|
|
|
end GNAT.OS_Lib;
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