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1 :	monnier	2	(* unix-env-sig.sml
2 :			*
3 :			* COPYRIGHT (c) 1993 by AT&T Bell Laboratories. See COPYRIGHT file for details.
4 :			*
5 :			* A UNIX environment is a list of strings of the form "name=value", where
6 :			* the "=" character does not appear in name.
7 :			* NOTE: binding the user's environment as an ML value and then exporting the
8 :			* ML image can result in incorrect behavior, since the environment bound in the
9 :			* heap image may differ from the user's environment when the exported image
10 :			* is used.
11 :			*)
12 :
13 :			signature UNIX_ENV =
14 :			sig
15 :
16 :			val getFromEnv : (string * string list) -> string option
17 :			(* return the value, if any, bound to the name. *)
18 :
19 :			val getValue : {name : string, default : string, env : string list} -> string
20 :			(* return the value bound to the name, or a default value *)
21 :
22 :			val removeFromEnv : (string * string list) -> string list
23 :			(* remove a binding from an environment *)
24 :
25 :			val addToEnv : (string * string list) -> string list
26 :			(* add a binding to an environment, replacing an existing binding
27 :			* if necessary.
28 :			*)
29 :
30 :			val environ : unit -> string list
31 :			(* return the user's environment *)
32 :
33 :			val getEnv : string -> string option
34 :			(* return the binding of an environment variable in the
35 :			* user's environment.
36 :			*)
37 :
38 :			end; (* UNIX_ENV *)
39 :

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