gomp-20050608-branch/gcc/ada/a-envvar.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --              A D A . E N V I R O N M E N T _ V A R I A B L E S           --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2005-2006, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- This specification is adapted from the Ada Reference Manual for use with --
  12 -- GNAT.  In accordance with the copyright of that document, you can freely --
  13 -- copy and modify this specification,  provided that if you redistribute a --
  14 -- modified version,  any changes that you have made are clearly indicated. --
  15 ---                                                                          --
  16 ------------------------------------------------------------------------------
  17
  18 package Ada.Environment_Variables is
  19    pragma Preelaborate (Environment_Variables);
  20
  21    function Value (Name : String) return String;
  22    --  If the external execution environment supports environment variables,
  23    --  then Value returns the value of the environment variable with the given
  24    --  name. If no environment variable with the given name exists, then
  25    --  Constraint_Error is propagated. If the execution environment does not
  26    --  support environment variables, then Program_Error is propagated.
  27
  28    function Exists (Name : String) return Boolean;
  29    --  If the external execution environment supports environment variables and
  30    --  an environment variable with the given name currently exists, then
  31    --  Exists returns True; otherwise it returns False.
  32
  33    procedure Set (Name : String; Value : String);
  34    --  If the external execution environment supports environment variables,
  35    --  then Set first clears any existing environment variable with the given
  36    --  name, and then defines a single new environment variable with the given
  37    --  name and value. Otherwise Program_Error is propagated.
  38    --  If implementation-defined circumstances prohibit the definition of an
  39    --  environment variable with the given name and value, then
  40    --  Constraint_Error is propagated.
  41    --  It is implementation defined whether there exist values for which the
  42    --  call Set(Name, Value) has the same effect as Clear (Name).
  43
  44    procedure Clear (Name : String);
  45    --  If the external execution environment supports environment variables,
  46    --  then Clear deletes all existing environment variables with the given
  47    --  name. Otherwise Program_Error is propagated.
  48
  49    procedure Clear;
  50    --  If the external execution environment supports environment variables,
  51    --  then Clear deletes all existing environment variables. Otherwise
  52    --  Program_Error is propagated.
  53
  54    procedure Iterate
  55      (Process : not null access procedure (Name, Value : String));
  56    --  If the external execution environment supports environment variables,
  57    --  then Iterate calls the subprogram designated by Process for each
  58    --  existing environment variable, passing the name and value of that
  59    --  environment variable. Otherwise Program_Error is propagated.
  60
  61 end Ada.Environment_Variables;