1088 lines
51 KiB
Ada
1088 lines
51 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S Y S T E M . 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) 1995-2015, 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 3, 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. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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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 grow
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-- 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 in
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-- large portions of the RTL. For example, functions return access to string
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-- as part of avoiding functions returning unconstrained types.
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-- Except where specifically noted, these routines are portable across all
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-- GNAT implementations on all supported operating systems.
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-- Note: this package is in the System hierarchy so that it can be directly
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-- be used by other predefined packages. User access to this package is via
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-- a renaming of this package in GNAT.OS_Lib (file g-os_lib.ads).
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pragma Compiler_Unit_Warning;
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with System;
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with System.Strings;
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package System.OS_Lib is
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pragma Preelaborate;
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-----------------------
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-- String Operations --
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-----------------------
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-- These are reexported from package Strings (which was introduced to
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-- avoid different packages declaring different types unnecessarily).
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-- See package System.Strings for details.
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subtype String_Access is Strings.String_Access;
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function "=" (Left : String_Access; Right : String_Access) return Boolean
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renames Strings."=";
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procedure Free (X : in out String_Access) renames Strings.Free;
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subtype String_List is Strings.String_List;
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function "=" (Left : String_List; Right : String_List) return Boolean
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renames Strings."=";
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function "&" (Left : String_Access; Right : String_Access)
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return String_List renames Strings."&";
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function "&" (Left : String_Access; Right : String_List)
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return String_List renames Strings."&";
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function "&" (Left : String_List; Right : String_Access)
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return String_List renames Strings."&";
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function "&" (Left : String_List; Right : String_List)
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return String_List renames Strings."&";
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subtype String_List_Access is Strings.String_List_Access;
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function "="
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(Left : String_List_Access;
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Right : String_List_Access) return Boolean renames Strings."=";
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procedure Free (Arg : in out String_List_Access) renames Strings.Free;
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---------------------
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-- Time/Date Stuff --
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---------------------
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type OS_Time is private;
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-- The OS's notion of time is represented by the private type OS_Time. This
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-- is the type returned by the File_Time_Stamp functions to obtain the time
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-- stamp of a specified file. Functions and a procedure (modeled after the
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-- similar subprograms in package Calendar) are provided for extracting
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-- information from a value of this type. Although these are called GM, the
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-- intention in the case of time stamps is not that they provide GMT times
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-- in all cases but rather the actual (time-zone independent) time stamp of
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-- the file (of course in Unix systems, this *is* in GMT form).
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Invalid_Time : constant OS_Time;
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-- A special unique value used to flag an invalid time stamp value
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function "<" (X : OS_Time; Y : OS_Time) return Boolean;
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function ">" (X : OS_Time; Y : OS_Time) return Boolean;
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function ">=" (X : OS_Time; Y : OS_Time) return Boolean;
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function "<=" (X : OS_Time; Y : OS_Time) return Boolean;
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-- Basic comparison operators on OS_Time with obvious meanings. Note that
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-- these have Intrinsic convention, so for example it is not permissible
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-- to create accesses to any of these functions.
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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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-- Declarations similar to those in Calendar, breaking down the time
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function Current_Time return OS_Time;
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-- Return the system clock value as OS_Time
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function Current_Time_String return String;
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-- Returns current local time in the form YYYY-MM-DD HH:MM:SS. The result
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-- has bounds 1 .. 19.
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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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-- Functions to extract information from OS_Time value in GMT form
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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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-- Analogous to the Split routine in Ada.Calendar, takes an OS_Time and
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-- provides a representation of it as a set of component parts, to be
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-- interpreted as a date point in UTC.
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function GM_Time_Of
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(Year : Year_Type;
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Month : Month_Type;
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Day : Day_Type;
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Hour : Hour_Type;
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Minute : Minute_Type;
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Second : Second_Type) return OS_Time;
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-- Analogous to the Time_Of routine in Ada.Calendar, takes a set of time
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-- component parts to be interpreted in the local time zone, and returns
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-- an OS_Time. Returns Invalid_Time if the creation fails.
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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 of
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-- I/O routines in the typical C library (these functions are not part of
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-- the ANSI C standard, but are typically available in all systems). See
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-- also package Interfaces.C_Streams for access to the stream level
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-- routines.
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-- Note on file names. If a file name is passed as type String in any of
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-- the following specifications, then the name is a normal Ada string and
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-- 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 new Integer;
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-- Corresponds to the int file handle values used in the C routines
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Standin : constant File_Descriptor := 0;
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Standout : constant File_Descriptor := 1;
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Standerr : constant File_Descriptor := 2;
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-- File descriptors for standard input output files
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Invalid_FD : constant File_Descriptor := -1;
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-- File descriptor returned when error in opening/creating file
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procedure Close (FD : File_Descriptor; Status : out Boolean);
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-- Close file referenced by FD. Status is False if the underlying service
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-- failed. Reasons for failure include: disk full, disk quotas exceeded
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-- and invalid file descriptor (the file may have been closed twice).
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procedure Close (FD : File_Descriptor);
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-- Close file referenced by FD. This form is used when the caller wants to
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-- ignore any possible error (see above for error cases).
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type Copy_Mode is
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(Copy,
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-- Copy the file. It is an error if the target file already exists. The
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-- time stamps and other file attributes are preserved in the copy.
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Overwrite,
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-- If the target file exists, the file is replaced otherwise the file
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-- is just copied. The time stamps and other file attributes are
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-- preserved in the copy.
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Append);
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-- If the target file exists, the contents of the source file is
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-- appended at the end. Otherwise the source file is just copied. The
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-- time stamps and other file attributes are preserved if the
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-- destination file does not exist.
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type Attribute is
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(Time_Stamps,
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-- Copy time stamps from source file to target file. All other
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-- attributes are set to normal default values for file creation.
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Full,
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-- All attributes are copied from the source file to the target file.
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-- This includes the timestamps, and for example also includes
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-- read/write/execute attributes in Unix systems.
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None);
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-- No attributes are copied. All attributes including the time stamp
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-- values are set to normal default values for file creation.
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-- Note: The default is Time_Stamps, which corresponds to the normal
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-- default on Windows style systems. Full corresponds to the typical
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-- effect of "cp -p" on Unix systems, and None corresponds to the typical
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-- effect of "cp" on Unix systems.
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-- Note: Time_Stamps and Full are not supported on VxWorks 5
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procedure Copy_File
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(Name : String;
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Pathname : String;
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Success : out Boolean;
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Mode : Copy_Mode := Copy;
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Preserve : Attribute := Time_Stamps);
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-- Copy a file. Name must designate a single file (no wild cards allowed).
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-- Pathname can be a filename or directory name. In the latter case Name
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-- is copied into the directory preserving the same file name. Mode
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-- defines the kind of copy, see above with the default being a normal
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-- copy in which the target file must not already exist. Success is set to
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-- True or False indicating if the copy is successful (depending on the
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-- specified Mode).
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procedure Copy_File_Attributes
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(From : String;
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To : String;
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Success : out Boolean;
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Copy_Timestamp : Boolean := True;
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Copy_Permissions : Boolean := True);
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-- Copy some of the file attributes from one file to another. Both files
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-- must exist, or Success is set to False.
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procedure Copy_Time_Stamps
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(Source : String;
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Dest : String;
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Success : out Boolean);
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-- Copy Source file time stamps (last modification and last access time
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-- stamps) to Dest file. Source and Dest must be valid filenames,
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-- furthermore Dest must be writable. Success will be set to True if the
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-- operation was successful and False otherwise.
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--
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-- Note: this procedure is not supported on VxWorks 5. On this platform,
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-- Success is always set to False.
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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 Create_File
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(Name : String;
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Fmode : Mode) 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. If the file already exists, it is
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-- overwritten. File descriptor returned is Invalid_FD if file cannot be
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-- successfully created.
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function Create_New_File
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(Name : String;
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Fmode : Mode) 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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function Create_Output_Text_File (Name : String) return File_Descriptor;
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-- Creates new text file with given name suitable to redirect standard
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-- output, returning file descriptor. File descriptor returned is
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-- Invalid_FD if file cannot be successfully 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 in the current working
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-- directory. The name of the file and the File Descriptor are returned.
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-- The File Descriptor returned is Invalid_FD in the case of failure. No
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-- mode parameter is provided. Since this is a temporary file, there is no
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-- point in doing text translation on it.
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--
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-- On some operating systems, the maximum number of temp files that can be
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-- created with this procedure may be limited. When the maximum is reached,
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-- this procedure returns Invalid_FD. On some operating systems, there may
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-- be a race condition between processes trying to create temp files at the
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-- same time in the same directory using this procedure.
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procedure Create_Temp_File
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(FD : out File_Descriptor;
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Name : out String_Access);
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-- Create and open for writing a temporary file in the current working
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-- directory. The name of the file and the File Descriptor are returned.
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-- It is the responsibility of the caller to deallocate the access value
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-- returned in Name.
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--
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-- The file is opened in binary mode (no text translation).
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--
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-- This procedure will always succeed if the current working directory is
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-- writable. If the current working directory is not writable, then
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-- Invalid_FD is returned for the file descriptor and null for the Name.
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-- There is no race condition problem between processes trying to create
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-- temp files at the same time in the same directory.
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procedure Create_Temp_Output_File
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(FD : out File_Descriptor;
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Name : out String_Access);
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-- Create and open for writing a temporary file in the current working
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-- directory suitable to redirect standard output. The name of the file and
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-- the File Descriptor are returned. It is the responsibility of the caller
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-- to deallocate the access value returned in Name.
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--
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-- The file is opened in text mode
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--
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-- This procedure will always succeed if the current working directory is
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-- writable. If the current working directory is not writable, then
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-- Invalid_FD is returned for the file descriptor and null for the Name.
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-- There is no race condition problem between processes trying to create
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-- temp files at the same time in the same directory.
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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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function File_Length (FD : File_Descriptor) return Long_Integer;
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pragma Import (C, File_Length, "__gnat_file_length_long");
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type Large_File_Size is range -2**63 .. 2**63 - 1;
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-- Maximum supported size for a file (8 exabytes = 8 million terabytes,
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-- should be enough to accomodate all possible needs for quite a while).
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function File_Length64 (FD : File_Descriptor) return Large_File_Size;
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pragma Import (C, File_Length64, "__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 unopened file. Returns
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-- Invalid_Time is Name doesn't correspond to an existing 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 Returns Invalid_Time is
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-- FD doesn't correspond to an existing file.
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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 after use to avoid storage 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 the
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-- heap and should be freed after use to avoid storage 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 heap
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-- and should be freed after use to avoid storage leaks.
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function Get_Target_Debuggable_Suffix return String_Access;
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-- Return the target debuggable suffix convention. Usually this is the same
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-- as the convention for Get_Executable_Suffix. The result is allocated on
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-- the heap and should be freed after use to avoid storage leaks.
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function Get_Target_Executable_Suffix return String_Access;
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-- Return the target executable suffix convention. The result is allocated
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-- on the heap and should be freed after use to avoid storage leaks.
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function Get_Target_Object_Suffix return String_Access;
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-- Return the target object suffix convention. The result is allocated on
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-- the heap and should be freed after use to avoid storage leaks.
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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 a
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-- file or directory absolutely rather than relative to another directory.
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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. Name may be an absolute path
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-- name or a relative path name, including a simple file name. If it is
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-- a relative path name, it is relative to the current working directory.
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function Is_Executable_File (Name : String) return Boolean;
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-- Determines if the given string, Name, is the name of an existing file
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-- that is executable. Returns True if so, False otherwise. Note that this
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-- function simply interrogates the file attributes (e.g. using the C
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-- function stat), so it does not indicate a situation in which a file may
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-- not actually be readable due to some other process having exclusive
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-- access.
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function Is_Readable_File (Name : String) return Boolean;
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-- Determines if the given string, Name, is the name of an existing file
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-- that is readable. Returns True if so, False otherwise. Note that this
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-- function simply interrogates the file attributes (e.g. using the C
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-- function stat), so it does not indicate a situation in which a file may
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-- not actually be readable due to some other process having exclusive
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-- access.
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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. Name may be an
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-- absolute path name or a relative path name, including a simple file
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-- name. If it is a relative path name, it is relative to the current
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-- working directory.
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function Is_Symbolic_Link (Name : String) return Boolean;
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-- Determines if the given string, Name, is the path of a symbolic link on
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-- systems that support it. Returns True if so, False if the path is not a
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-- symbolic link or if the system does not support symbolic links.
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--
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-- A symbolic link is an indirect pointer to a file; its directory entry
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-- contains the name of the file to which it is linked. Symbolic links may
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-- span file systems and may refer to directories.
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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 file
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-- that is writable. Returns True if so, False otherwise. Note that this
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-- function simply interrogates the file attributes (e.g. using the C
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-- function stat), so it does not indicate a situation in which a file may
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-- not actually be writeable due to some other process having exclusive
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-- access.
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function Locate_Exec_On_Path (Exec_Name : String) 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 does not
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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. If the executable is
|
|
-- not found, null is returned.
|
|
--
|
|
-- Note that this function allocates memory for the returned value. This
|
|
-- memory needs to be deallocated after use.
|
|
|
|
function Locate_Regular_File
|
|
(File_Name : String;
|
|
Path : String) return String_Access;
|
|
-- Try to locate a regular file whose name is given by File_Name in the
|
|
-- directories listed in Path. If a file is found, its full pathname is
|
|
-- returned; otherwise, a null pointer is returned. If the File_Name given
|
|
-- is an absolute pathname, then Locate_Regular_File just checks that the
|
|
-- file exists and is a regular file. Otherwise, if the File_Name given
|
|
-- includes directory information, Locate_Regular_File first checks if the
|
|
-- file exists relative to the current directory. If it does not, or if
|
|
-- the File_Name given is a simple file name, the Path argument is parsed
|
|
-- according to OS conventions, and for each directory in the Path a check
|
|
-- is made if File_Name is a relative pathname of a regular file from that
|
|
-- directory.
|
|
--
|
|
-- Note that this function allocates some memory for the returned value.
|
|
-- This memory needs to be deallocated after use.
|
|
|
|
Seek_Cur : constant := 1;
|
|
Seek_End : constant := 2;
|
|
Seek_Set : constant := 0;
|
|
-- Used to indicate origin for Lseek call
|
|
|
|
procedure Lseek
|
|
(FD : File_Descriptor;
|
|
offset : Long_Integer;
|
|
origin : Integer);
|
|
pragma Import (C, Lseek, "__gnat_lseek");
|
|
-- Sets the current file pointer to the indicated offset value, relative
|
|
-- to the current position (origin = SEEK_CUR), end of file (origin =
|
|
-- SEEK_END), or start of file (origin = SEEK_SET).
|
|
|
|
function Normalize_Pathname
|
|
(Name : String;
|
|
Directory : String := "";
|
|
Resolve_Links : Boolean := True;
|
|
Case_Sensitive : Boolean := True) return String;
|
|
-- Returns a file name as an absolute path name, resolving all relative
|
|
-- directories, and symbolic links. If Name is a relative path, it is
|
|
-- interpreted relative to Directory, or to the current directory if
|
|
-- Directory is the empty string (the default). The result returned is
|
|
-- the normalized name of the file, containing no "." or ".." components,
|
|
-- and no duplicated directory separators. For most cases, if two file
|
|
-- names designate the same file through different paths,
|
|
-- Normalize_Pathname will return the same canonical name in both cases.
|
|
-- However, there are cases when this is not true; for example, this is
|
|
-- not true in Unix for two hard links designating the same file.
|
|
--
|
|
-- On Windows, the returned path will start with a drive letter. If
|
|
-- Directory is empty (the default) and Name is a relative path or an
|
|
-- absolute path without drive letter, the letter of the current drive
|
|
-- will start the returned path. If Case_Sensitive is True (the default),
|
|
-- then this drive letter will be forced to upper case ("C:\...").
|
|
--
|
|
-- If Resolve_Links is set to True, then the symbolic links, on systems
|
|
-- that support them, will be fully converted to the name of the file or
|
|
-- directory pointed to. This is slightly less efficient, since it
|
|
-- requires system calls.
|
|
--
|
|
-- If Name cannot be resolved, is invalid (for example if it is too big) or
|
|
-- is null on entry (for example if there is symbolic link circularity,
|
|
-- e.g. A is a symbolic link for B, and B is a symbolic link for A), then
|
|
-- Normalize_Pathname returns an empty string.
|
|
--
|
|
-- For case-sensitive file systems, the value of Case_Sensitive parameter
|
|
-- is ignored. For file systems that are not case-sensitive, such as
|
|
-- Windows, if this parameter is set to False, then the file and directory
|
|
-- names are folded to lower case. This allows checking whether two files
|
|
-- are the same by applying this function to their names and comparing the
|
|
-- results. If Case_Sensitive is set to True, this function does not change
|
|
-- the casing of file and directory names.
|
|
|
|
function Open_Append
|
|
(Name : String;
|
|
Fmode : Mode) return File_Descriptor;
|
|
-- Opens file Name for appending, returning its file descriptor. File
|
|
-- descriptor returned is Invalid_FD if the file cannot be successfully
|
|
-- opened.
|
|
|
|
function Open_Read
|
|
(Name : String;
|
|
Fmode : Mode) return File_Descriptor;
|
|
-- Open file Name for reading, returning its file descriptor. File
|
|
-- descriptor returned is Invalid_FD if the file cannot be opened.
|
|
|
|
function Open_Read_Write
|
|
(Name : String;
|
|
Fmode : Mode) return File_Descriptor;
|
|
-- Open file Name for both reading and writing, returning its file
|
|
-- descriptor. File descriptor returned is Invalid_FD if the file
|
|
-- cannot be opened.
|
|
|
|
function Read
|
|
(FD : File_Descriptor;
|
|
A : System.Address;
|
|
N : Integer) return Integer;
|
|
-- Read N bytes to address A from file referenced by FD. Returned value is
|
|
-- count of bytes actually read, which can be less than N at EOF.
|
|
|
|
procedure Rename_File
|
|
(Old_Name : String;
|
|
New_Name : String;
|
|
Success : out Boolean);
|
|
-- Rename a file. Success is set True or False indicating if the rename is
|
|
-- successful or not.
|
|
--
|
|
-- WARNING: In one very important respect, this function is significantly
|
|
-- non-portable. If New_Name already exists then on Unix systems, the call
|
|
-- deletes the existing file, and the call signals success. On Windows, the
|
|
-- call fails, without doing the rename operation. See also the procedure
|
|
-- Ada.Directories.Rename, which portably provides the windows semantics,
|
|
-- i.e. fails if the output file already exists.
|
|
|
|
-- The following defines the mode for the Copy_File procedure below. Note
|
|
-- that "time stamps and other file attributes" in the descriptions below
|
|
-- refers to the creation and last modification times, and also the file
|
|
-- access (read/write/execute) status flags.
|
|
|
|
procedure Set_Close_On_Exec
|
|
(FD : File_Descriptor;
|
|
Close_On_Exec : Boolean;
|
|
Status : out Boolean);
|
|
-- When Close_On_Exec is True, mark FD to be closed automatically when new
|
|
-- program is executed by the calling process (i.e. prevent FD from being
|
|
-- inherited by child processes). When Close_On_Exec is False, mark FD to
|
|
-- not be closed on exec (i.e. allow it to be inherited). Status is False
|
|
-- if the operation could not be performed.
|
|
|
|
S_Owner : constant := 1;
|
|
S_Group : constant := 2;
|
|
S_Others : constant := 4;
|
|
-- Constants for use in Mode parameter to Set_Executable
|
|
|
|
procedure Set_Executable (Name : String; Mode : Positive := S_Owner);
|
|
-- Change permissions on the file given by Name to make it executable
|
|
-- for its owner, group or others, according to the setting of Mode.
|
|
-- As indicated, the default if no Mode parameter is given is owner.
|
|
|
|
procedure Set_File_Last_Modify_Time_Stamp (Name : String; Time : OS_Time);
|
|
-- Given the name of a file or directory, Name, set the last modification
|
|
-- time stamp. This function must be used for an unopened file.
|
|
|
|
procedure Set_Non_Readable (Name : String);
|
|
-- Change permissions on the named file to make it non-readable for
|
|
-- its owner. The writable and executable permissions are not
|
|
-- modified.
|
|
|
|
procedure Set_Non_Writable (Name : String);
|
|
-- Change permissions on the named file to make it non-writable for its
|
|
-- owner. The readable and executable permissions are not modified.
|
|
|
|
procedure Set_Read_Only (Name : String) renames Set_Non_Writable;
|
|
-- This renaming is provided for backwards compatibility with previous
|
|
-- versions. The use of Set_Non_Writable is preferred (clearer name).
|
|
|
|
procedure Set_Readable (Name : String);
|
|
-- Change permissions on the named file to make it readable for its
|
|
-- owner.
|
|
|
|
procedure Set_Writable (Name : String);
|
|
-- Change permissions on the named file to make it writable for its owner
|
|
|
|
function Write
|
|
(FD : File_Descriptor;
|
|
A : System.Address;
|
|
N : Integer) return Integer;
|
|
-- Write N bytes from address A to file referenced by FD. The returned
|
|
-- value is the number of bytes written, which can be less than N if a
|
|
-- disk full condition was detected.
|
|
|
|
-- The following section contains low-level routines using addresses to
|
|
-- pass file name and executable name. In each routine the name must be
|
|
-- Nul-Terminated. For complete documentation refer to the equivalent
|
|
-- routine (using String in place of C_File_Name) defined above.
|
|
|
|
subtype C_File_Name is System.Address;
|
|
-- This subtype is used to document that a parameter is the address of a
|
|
-- null-terminated string containing the name of a file.
|
|
|
|
-- All the following functions need comments ???
|
|
|
|
procedure Copy_File
|
|
(Name : C_File_Name;
|
|
Pathname : C_File_Name;
|
|
Success : out Boolean;
|
|
Mode : Copy_Mode := Copy;
|
|
Preserve : Attribute := Time_Stamps);
|
|
|
|
procedure Copy_Time_Stamps
|
|
(Source : C_File_Name;
|
|
Dest : C_File_Name;
|
|
Success : out Boolean);
|
|
|
|
function Create_File
|
|
(Name : C_File_Name;
|
|
Fmode : Mode) return File_Descriptor;
|
|
|
|
function Create_New_File
|
|
(Name : C_File_Name;
|
|
Fmode : Mode) return File_Descriptor;
|
|
|
|
procedure Delete_File (Name : C_File_Name; Success : out Boolean);
|
|
|
|
function File_Time_Stamp (Name : C_File_Name) return OS_Time;
|
|
-- Returns Invalid_Time is Name doesn't correspond to an existing file
|
|
|
|
function Is_Directory (Name : C_File_Name) return Boolean;
|
|
function Is_Executable_File (Name : C_File_Name) return Boolean;
|
|
function Is_Readable_File (Name : C_File_Name) return Boolean;
|
|
function Is_Regular_File (Name : C_File_Name) return Boolean;
|
|
function Is_Symbolic_Link (Name : C_File_Name) return Boolean;
|
|
function Is_Writable_File (Name : C_File_Name) return Boolean;
|
|
|
|
function Locate_Regular_File
|
|
(File_Name : C_File_Name;
|
|
Path : C_File_Name) return String_Access;
|
|
|
|
function Open_Append
|
|
(Name : C_File_Name;
|
|
Fmode : Mode) return File_Descriptor;
|
|
|
|
function Open_Read
|
|
(Name : C_File_Name;
|
|
Fmode : Mode) return File_Descriptor;
|
|
|
|
function Open_Read_Write
|
|
(Name : C_File_Name;
|
|
Fmode : Mode) return File_Descriptor;
|
|
|
|
procedure Rename_File
|
|
(Old_Name : C_File_Name;
|
|
New_Name : C_File_Name;
|
|
Success : out Boolean);
|
|
|
|
------------------
|
|
-- Subprocesses --
|
|
------------------
|
|
|
|
subtype Argument_List is String_List;
|
|
-- Type used for argument list in call to Spawn. The lower bound of the
|
|
-- array should be 1, and the length of the array indicates the number of
|
|
-- arguments.
|
|
|
|
subtype Argument_List_Access is String_List_Access;
|
|
-- Type used to return Argument_List without dragging in secondary stack.
|
|
-- Note that there is a Free procedure declared for this subtype which
|
|
-- frees the array and all referenced strings.
|
|
|
|
type Process_Id is private;
|
|
-- A private type used to identify a process activated by the following
|
|
-- non-blocking calls. The only meaningful operation on this type is a
|
|
-- comparison for equality.
|
|
|
|
Invalid_Pid : constant Process_Id;
|
|
-- A special value used to indicate errors, as described below
|
|
|
|
function Argument_String_To_List
|
|
(Arg_String : String) return Argument_List_Access;
|
|
-- Take a string that is a program and its 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.
|
|
-- On Windows, backslashes are used as directory separators. On Unix,
|
|
-- however, they are used to escape the following character, so that for
|
|
-- instance "-d=name\ with\ space" is a single argument. In the result
|
|
-- list, the backslashes have been cleaned up when needed. The previous
|
|
-- example will thus result a single-element array, where the element is
|
|
-- "-d=name with space" (Unix) or "-d=name\ with\ space" (windows).
|
|
|
|
procedure Kill (Pid : Process_Id; Hard_Kill : Boolean := True);
|
|
-- Kill the process designated by Pid. Does nothing if Pid is Invalid_Pid
|
|
-- or on platforms where it is not supported, such as VxWorks. Hard_Kill
|
|
-- is True by default, and when True the process is terminated immediately.
|
|
-- If Hard_Kill is False, then a signal SIGINT is sent to the process on
|
|
-- POSIX OS or a ctrl-C event on Windows, allowing the process a chance to
|
|
-- terminate properly using a corresponding handler.
|
|
|
|
procedure Kill_Process_Tree (Pid : Process_Id; Hard_Kill : Boolean := True);
|
|
-- Kill the process designated by Pid and all it's children processes.
|
|
-- Does nothing if Pid is Invalid_Pid or on platforms where it is not
|
|
-- supported, such as VxWorks. Hard_Kill is True by default, and when True
|
|
-- the processes are terminated immediately. If Hard_Kill is False, then a
|
|
-- signal SIGINT is sent to the processes on POSIX OS or a ctrl-C event
|
|
-- on Windows, allowing the processes a chance to terminate properly
|
|
-- using a corresponding handler.
|
|
--
|
|
-- Note that this routine is not atomic and is supported only on Linux
|
|
-- and Windows. On other OS it will only kill the process identified by
|
|
-- Pid.
|
|
|
|
function Non_Blocking_Spawn
|
|
(Program_Name : String;
|
|
Args : Argument_List) return Process_Id;
|
|
-- This is a non blocking call. The Process_Id of the spawned process is
|
|
-- returned. Parameters are to be used as in Spawn. If Invalid_Pid is
|
|
-- returned the program could not be spawned.
|
|
--
|
|
-- Spawning processes from tasking programs is not recommended. See
|
|
-- "NOTE: Spawn in tasking programs" below.
|
|
--
|
|
-- This function will always return Invalid_Pid under VxWorks, since there
|
|
-- is no notion of executables under this OS.
|
|
|
|
function Non_Blocking_Spawn
|
|
(Program_Name : String;
|
|
Args : Argument_List;
|
|
Output_File_Descriptor : File_Descriptor;
|
|
Err_To_Out : Boolean := True) return Process_Id;
|
|
-- Similar to the procedure above, but redirects the output to the file
|
|
-- designated by Output_File_Descriptor. If Err_To_Out is True, then the
|
|
-- Standard Error output is also redirected. Invalid_Pid is returned
|
|
-- if the program could not be spawned successfully.
|
|
--
|
|
-- Spawning processes from tasking programs is not recommended. See
|
|
-- "NOTE: Spawn in tasking programs" below.
|
|
--
|
|
-- This function will always return Invalid_Pid under VxWorks, since there
|
|
-- is no notion of executables under this OS.
|
|
|
|
function Non_Blocking_Spawn
|
|
(Program_Name : String;
|
|
Args : Argument_List;
|
|
Output_File : String;
|
|
Err_To_Out : Boolean := True) return Process_Id;
|
|
-- Similar to the procedure above, but saves the output of the command to
|
|
-- a file with the name Output_File.
|
|
--
|
|
-- Invalid_Pid is returned if the output file could not be created or if
|
|
-- the program could not be spawned successfully.
|
|
--
|
|
-- Spawning processes from tasking programs is not recommended. See
|
|
-- "NOTE: Spawn in tasking programs" below.
|
|
--
|
|
-- This function will always return Invalid_Pid under VxWorks, since there
|
|
-- is no notion of executables under this OS.
|
|
|
|
function Non_Blocking_Spawn
|
|
(Program_Name : String;
|
|
Args : Argument_List;
|
|
Stdout_File : String;
|
|
Stderr_File : String) return Process_Id;
|
|
-- Similar to the procedure above, but saves the standard output of the
|
|
-- command to a file with the name Stdout_File and the standard output
|
|
-- of the command to a file with the name Stderr_File.
|
|
|
|
procedure Normalize_Arguments (Args : in out Argument_List);
|
|
-- Normalize all arguments in the list. This ensure that the argument list
|
|
-- is compatible with the running OS and will works fine with Spawn and
|
|
-- Non_Blocking_Spawn for example. If Normalize_Arguments is called twice
|
|
-- on the same list it will do nothing the second time. Note that Spawn
|
|
-- and Non_Blocking_Spawn call Normalize_Arguments automatically, but
|
|
-- since there is a guarantee that a second call does nothing, this
|
|
-- internal call will have no effect if Normalize_Arguments is called
|
|
-- before calling Spawn. The call to Normalize_Arguments assumes that the
|
|
-- individual referenced arguments in Argument_List are on the heap, and
|
|
-- may free them and reallocate if they are modified.
|
|
|
|
function Pid_To_Integer (Pid : Process_Id) return Integer;
|
|
-- Convert a process id to an Integer. Useful for writing hash functions
|
|
-- for type Process_Id or to compare two Process_Id (e.g. for sorting).
|
|
|
|
procedure Spawn
|
|
(Program_Name : String;
|
|
Args : Argument_List;
|
|
Success : out Boolean);
|
|
-- This procedure spawns a program with a given list of arguments. The
|
|
-- first parameter of is the name of the executable. The second parameter
|
|
-- contains the arguments to be passed to this program. Success is False
|
|
-- if the named program could not be spawned or its execution completed
|
|
-- unsuccessfully. Note that the caller will be blocked until the
|
|
-- execution of the spawned program is complete. For maximum portability,
|
|
-- use a full path name for the Program_Name argument. On some systems
|
|
-- (notably Unix systems) a simple file name may also work (if the
|
|
-- executable can be located in the path).
|
|
--
|
|
-- Spawning processes from tasking programs is not recommended. See
|
|
-- "NOTE: Spawn in tasking programs" below.
|
|
--
|
|
-- Note: Arguments in Args that contain spaces and/or quotes such as
|
|
-- "--GCC=gcc -v" or "--GCC=""gcc -v""" are not portable across all
|
|
-- operating systems, and would not have the desired effect if they were
|
|
-- passed directly to the operating system. To avoid this problem, Spawn
|
|
-- makes an internal call to Normalize_Arguments, which ensures that such
|
|
-- arguments are modified in a manner that ensures that the desired effect
|
|
-- is obtained on all operating systems. The caller may call
|
|
-- Normalize_Arguments explicitly before the call (e.g. to print out the
|
|
-- exact form of arguments passed to the operating system). In this case
|
|
-- the guarantee a second call to Normalize_Arguments has no effect
|
|
-- ensures that the internal call will not affect the result. Note that
|
|
-- the implicit call to Normalize_Arguments may free and reallocate some
|
|
-- of the individual arguments.
|
|
--
|
|
-- This function will always set Success to False under VxWorks and other
|
|
-- similar operating systems which have no notion of the concept of
|
|
-- dynamically executable file. Otherwise Success is set True if the exit
|
|
-- status of the spawned process is zero.
|
|
|
|
function Spawn
|
|
(Program_Name : String;
|
|
Args : Argument_List) return Integer;
|
|
-- Similar to the above procedure, but returns the actual status returned
|
|
-- by the operating system, or -1 under VxWorks and any other similar
|
|
-- operating systems which have no notion of separately spawnable programs.
|
|
--
|
|
-- Spawning processes from tasking programs is not recommended. See
|
|
-- "NOTE: Spawn in tasking programs" below.
|
|
|
|
procedure Spawn
|
|
(Program_Name : String;
|
|
Args : Argument_List;
|
|
Output_File_Descriptor : File_Descriptor;
|
|
Return_Code : out Integer;
|
|
Err_To_Out : Boolean := True);
|
|
-- Similar to the procedure above, but redirects the output to the file
|
|
-- designated by Output_File_Descriptor. If Err_To_Out is True, then the
|
|
-- Standard Error output is also redirected.
|
|
-- Return_Code is set to the status code returned by the operating system
|
|
--
|
|
-- Spawning processes from tasking programs is not recommended. See
|
|
-- "NOTE: Spawn in tasking programs" below.
|
|
|
|
procedure Spawn
|
|
(Program_Name : String;
|
|
Args : Argument_List;
|
|
Output_File : String;
|
|
Success : out Boolean;
|
|
Return_Code : out Integer;
|
|
Err_To_Out : Boolean := True);
|
|
-- Similar to the procedure above, but saves the output of the command to
|
|
-- a file with the name Output_File.
|
|
--
|
|
-- Success is set to True if the command is executed and its output
|
|
-- successfully written to the file. If Success is True, then Return_Code
|
|
-- will be set to the status code returned by the operating system.
|
|
-- Otherwise, Return_Code is undefined.
|
|
--
|
|
-- Spawning processes from tasking programs is not recommended. See
|
|
-- "NOTE: Spawn in tasking programs" below.
|
|
|
|
procedure Wait_Process (Pid : out Process_Id; Success : out Boolean);
|
|
-- Wait for the completion of any of the processes created by previous
|
|
-- calls to Non_Blocking_Spawn. The caller will be suspended until one of
|
|
-- these processes terminates (normally or abnormally). If any of these
|
|
-- subprocesses terminates prior to the call to Wait_Process (and has not
|
|
-- been returned by a previous call to Wait_Process), then the call to
|
|
-- Wait_Process is immediate. Pid identifies the process that has
|
|
-- terminated (matching the value returned from Non_Blocking_Spawn).
|
|
-- Success is set to True if this sub-process terminated successfully. If
|
|
-- Pid = Invalid_Pid, there were no subprocesses left to wait on.
|
|
--
|
|
-- This function will always set success to False under VxWorks, since
|
|
-- there is no notion of executables under this OS.
|
|
|
|
-------------------------------------
|
|
-- NOTE: Spawn in Tasking Programs --
|
|
-------------------------------------
|
|
|
|
-- Spawning processes in tasking programs using the above Spawn and
|
|
-- Non_Blocking_Spawn subprograms is not recommended, because there are
|
|
-- subtle interactions between creating a process and signals/locks that
|
|
-- can cause trouble. These issues are not specific to Ada; they depend
|
|
-- primarily on the operating system.
|
|
|
|
-- If you need to spawn processes in a tasking program, you will need to
|
|
-- understand the semantics of your operating system, and you are likely to
|
|
-- write non-portable code, because operating systems differ in this area.
|
|
|
|
-- The Spawn and Non_Blocking_Spawn subprograms call the following
|
|
-- operating system functions:
|
|
|
|
-- On Windows: spawnvp (blocking) or CreateProcess (non-blocking)
|
|
|
|
-- On Solaris: fork1, followed in the child process by execv
|
|
|
|
-- On other Unix-like systems: fork, followed in the child
|
|
-- process by execv.
|
|
|
|
-- On vxworks, spawning of processes is not supported
|
|
|
|
-- For details, look at the functions __gnat_portable_spawn and
|
|
-- __gnat_portable_no_block_spawn in adaint.c.
|
|
|
|
-- You should read the operating-system-specific documentation for the
|
|
-- above functions, paying special attention to subtle interactions with
|
|
-- threading, signals, locks, and file descriptors. Most of the issues are
|
|
-- related to the fact that on Unix, there is a window of time between fork
|
|
-- and execv; Windows does not have this problem, because spawning is done
|
|
-- in a single operation.
|
|
|
|
-- On Posix-compliant systems, such as Linux, fork duplicates just the
|
|
-- calling thread. (On Solaris, fork1 is the Posix-compliant version of
|
|
-- fork.)
|
|
|
|
-- You should avoid using signals while spawning. This includes signals
|
|
-- used internally by the Ada run-time system, such as timer signals used
|
|
-- to implement delay statements.
|
|
|
|
-- It is best to spawn any subprocesses very early, before the parent
|
|
-- process creates tasks, locks, or installs signal handlers. Certainly
|
|
-- avoid doing simultaneous spawns from multiple threads of the same
|
|
-- process.
|
|
|
|
-- There is no problem spawning a subprocess that uses tasking: the
|
|
-- problems are caused only by tasking in the parent.
|
|
|
|
-- If the parent is using tasking, and needs to spawn subprocesses at
|
|
-- arbitrary times, one technique is for the parent to spawn (very early)
|
|
-- a particular spawn-manager subprocess whose job is to spawn other
|
|
-- processes. The spawn-manager must avoid tasking. The parent sends
|
|
-- messages to the spawn-manager requesting it to spawn processes, using
|
|
-- whatever inter-process communication mechanism you like, such as
|
|
-- sockets.
|
|
|
|
-- In short, mixing spawning of subprocesses with tasking is a tricky
|
|
-- business, and should be avoided if possible, but if it is necessary,
|
|
-- the above guidelines should be followed, and you should beware of
|
|
-- portability problems.
|
|
|
|
-------------------
|
|
-- Miscellaneous --
|
|
-------------------
|
|
|
|
function Errno return Integer;
|
|
pragma Import (C, Errno, "__get_errno");
|
|
-- Return the task-safe last error number
|
|
|
|
function Errno_Message
|
|
(Err : Integer := Errno;
|
|
Default : String := "") return String;
|
|
-- Return a message describing the given Errno value. If none is provided
|
|
-- by the system, return Default if not empty, else return a generic
|
|
-- message indicating the numeric errno value.
|
|
|
|
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 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).
|
|
|
|
procedure OS_Exit (Status : Integer);
|
|
pragma No_Return (OS_Exit);
|
|
-- Exit to OS with given status code (program is terminated). Note that
|
|
-- this is abrupt termination. All tasks are immediately terminated. There
|
|
-- are no finalization or other Ada-specific cleanup actions performed. On
|
|
-- systems with atexit handlers (such as Unix and Windows), atexit handlers
|
|
-- are called.
|
|
|
|
type OS_Exit_Subprogram is access procedure (Status : Integer);
|
|
|
|
procedure OS_Exit_Default (Status : Integer);
|
|
pragma No_Return (OS_Exit_Default);
|
|
-- Default implementation of procedure OS_Exit
|
|
|
|
OS_Exit_Ptr : OS_Exit_Subprogram := OS_Exit_Default'Access;
|
|
-- OS_Exit is implemented through this access value. It it then possible to
|
|
-- change the implementation of OS_Exit by redirecting OS_Exit_Ptr to an
|
|
-- other implementation.
|
|
|
|
procedure Set_Errno (Errno : Integer);
|
|
pragma Import (C, Set_Errno, "__set_errno");
|
|
-- Set the task-safe error number
|
|
|
|
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.
|
|
|
|
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");
|
|
pragma Import (C, Current_Time, "__gnat_current_time");
|
|
|
|
type OS_Time is
|
|
range -(2 ** (Standard'Address_Size - Integer'(1))) ..
|
|
+(2 ** (Standard'Address_Size - Integer'(1)) - 1);
|
|
-- Type used for timestamps in the compiler. This type is used to hold
|
|
-- time stamps, but may have a different representation than C's time_t.
|
|
-- This type needs to match the declaration of OS_Time in adaint.h.
|
|
|
|
-- Add pragma Inline statements for comparison operations on OS_Time. It
|
|
-- would actually be nice to use pragma Import (Intrinsic) here, but this
|
|
-- was not properly supported till GNAT 3.15a, so that would cause
|
|
-- bootstrap path problems. To be changed later ???
|
|
|
|
Invalid_Time : constant OS_Time := -1;
|
|
-- This value should match the return value from __gnat_file_time_*
|
|
|
|
pragma Inline ("<");
|
|
pragma Inline (">");
|
|
pragma Inline ("<=");
|
|
pragma Inline (">=");
|
|
|
|
type Process_Id is new Integer;
|
|
Invalid_Pid : constant Process_Id := -1;
|
|
|
|
end System.OS_Lib;
|