| 1 | (* linkage.sig |
| 2 | * 2005 Matthew Fluet (mfluet@acm.org) |
| 3 | * Adapted for MLton. |
| 4 | *) |
| 5 | |
| 6 | (* linkage.sig |
| 7 | * |
| 8 | * This module defines a high-level interface for dlopen. |
| 9 | * While addresses (those obtained by applying function "addr" below |
| 10 | * or addresses derived from those) will not remain valid across |
| 11 | * export{ML,Fn}/restart, handles *will* stay valid. |
| 12 | * |
| 13 | * Copyright (c) 2004 by The Fellowship of SML/NJ |
| 14 | * |
| 15 | * Author: Matthias Blume (blume@tti-c.org) |
| 16 | *) |
| 17 | signature DYN_LINKAGE = sig |
| 18 | |
| 19 | exception DynLinkError of string |
| 20 | |
| 21 | type lib_handle (* handle on dynamically linked library (DL) *) |
| 22 | type addr_handle (* handle on address obtained from a DL *) |
| 23 | |
| 24 | val main_lib : lib_handle (* the runtime system itself *) |
| 25 | |
| 26 | (* link new library and return its handle *) |
| 27 | val open_lib : { name: string, lazy: bool, global: bool } -> lib_handle |
| 28 | val open_lib' : { name: string, lazy: bool, global: bool, |
| 29 | dependencies: lib_handle list } -> lib_handle |
| 30 | |
| 31 | (* get the address handle of a symbol exported from a DL *) |
| 32 | val lib_symbol : lib_handle * string -> addr_handle |
| 33 | |
| 34 | (* fetch the actual address from an address handle; the value obtained |
| 35 | * is not valid across export{ML,Fn}/resume cycles *) |
| 36 | val addr : addr_handle -> MLton.Pointer.t |
| 37 | |
| 38 | (* unlink previously linked DL; this immediately invalidates all |
| 39 | * symbol addresses and handles associated with this library *) |
| 40 | val close_lib : lib_handle -> unit |
| 41 | end |