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The old platform-specific contents of importdl.c, broken down into one
file per platform (really: per style of Dl API; e.g. all platforms using dlopen() are grouped together in dynload_shlib.c.). This is part of a set of patches by Greg Stein.
This commit is contained in:
Guido van Rossum
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280
Python/dynload_beos.c
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280
Python/dynload_beos.c
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/***********************************************************
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Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI or Corporation for National Research Initiatives or
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CNRI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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While CWI is the initial source for this software, a modified version
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is made available by the Corporation for National Research Initiatives
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(CNRI) at the Internet address ftp://ftp.python.org.
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STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* Support for dynamic loading of extension modules */
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#include <kernel/image.h>
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#include <kernel/OS.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "Python.h"
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#include "importdl.h"
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const struct filedescr _PyImport_DynLoadFiletab[] = {
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{".so", "rb", C_EXTENSION},
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{"module.so", "rb", C_EXTENSION},
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{0, 0}
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};
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#if defined(MAXPATHLEN) && !defined(_SYS_PARAM_H)
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#undef MAXPATHLEN
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#endif
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#ifdef WITH_THREAD
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#include "pythread.h"
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static PyThread_type_lock beos_dyn_lock;
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#endif
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static PyObject *beos_dyn_images = NULL;
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/* ----------------------------------------------------------------------
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* BeOS dynamic loading support
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*
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* This uses shared libraries, but BeOS has its own way of doing things
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* (much easier than dlfnc.h, from the look of things). We'll use a
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* Python Dictionary object to store the images_ids so we can be very
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* nice and unload them when we exit.
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*
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* Note that this is thread-safe. Probably irrelevent, because of losing
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* systems... Python probably disables threads while loading modules.
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* Note the use of "probably"! Better to be safe than sorry. [chrish]
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*
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* As of 1.5.1 this should also work properly when you've configured
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* Python without thread support; the 1.5 version required it, which wasn't
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* very friendly. Note that I haven't tested it without threading... why
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* would you want to avoid threads on BeOS? [chrish]
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*
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* As of 1.5.2, the PyImport_BeImageID() function has been removed; Donn
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* tells me it's not necessary anymore because of PyCObject_Import().
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* [chrish]
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*/
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/* Whack an item; the item is an image_id in disguise, so we'll call
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* unload_add_on() for it.
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*/
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static void beos_nuke_dyn( PyObject *item )
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{
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status_t retval;
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if( item ) {
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image_id id = (image_id)PyInt_AsLong( item );
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retval = unload_add_on( id );
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}
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}
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/* atexit() handler that'll call unload_add_on() for every item in the
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* dictionary.
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*/
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static void beos_cleanup_dyn( void )
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{
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if( beos_dyn_images ) {
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int idx;
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int list_size;
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PyObject *id_list;
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#ifdef WITH_THREAD
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PyThread_acquire_lock( beos_dyn_lock, 1 );
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#endif
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id_list = PyDict_Values( beos_dyn_images );
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list_size = PyList_Size( id_list );
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for( idx = 0; idx < list_size; idx++ ) {
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PyObject *the_item;
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the_item = PyList_GetItem( id_list, idx );
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beos_nuke_dyn( the_item );
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}
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PyDict_Clear( beos_dyn_images );
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#ifdef WITH_THREAD
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PyThread_free_lock( beos_dyn_lock );
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#endif
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}
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}
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/*
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* Initialize our dictionary, and the dictionary mutex.
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*/
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static void beos_init_dyn( void )
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{
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/* We're protected from a race condition here by the atomic init_count
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* variable.
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*/
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static int32 init_count = 0;
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int32 val;
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val = atomic_add( &init_count, 1 );
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if( beos_dyn_images == NULL && val == 0 ) {
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beos_dyn_images = PyDict_New();
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#ifdef WITH_THREAD
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beos_dyn_lock = PyThread_allocate_lock();
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#endif
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atexit( beos_cleanup_dyn );
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}
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}
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/*
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* Add an image_id to the dictionary; the module name of the loaded image
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* is the key. Note that if the key is already in the dict, we unload
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* that image; this should allow reload() to work on dynamically loaded
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* modules (super-keen!).
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*/
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static void beos_add_dyn( char *name, image_id id )
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{
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int retval;
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PyObject *py_id;
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if( beos_dyn_images == NULL ) {
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beos_init_dyn();
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}
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#ifdef WITH_THREAD
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retval = PyThread_acquire_lock( beos_dyn_lock, 1 );
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#endif
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/* If there's already an object with this key in the dictionary,
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* we're doing a reload(), so let's nuke it.
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*/
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py_id = PyDict_GetItemString( beos_dyn_images, name );
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if( py_id ) {
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beos_nuke_dyn( py_id );
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retval = PyDict_DelItemString( beos_dyn_images, name );
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}
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py_id = PyInt_FromLong( (long)id );
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if( py_id ) {
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retval = PyDict_SetItemString( beos_dyn_images, name, py_id );
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}
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#ifdef WITH_THREAD
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PyThread_release_lock( beos_dyn_lock );
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#endif
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}
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dl_funcptr _PyImport_GetDynLoadFunc(const char *name, const char *funcname,
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const char *pathname, FILE *fp)
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{
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dl_funcptr p;
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image_id the_id;
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status_t retval;
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char fullpath[PATH_MAX];
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if( Py_VerboseFlag ) {
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printf( "load_add_on( %s )\n", pathname );
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}
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/* Hmm, this old bug appears to have regenerated itself; if the
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* path isn't absolute, load_add_on() will fail. Reported to Be
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* April 21, 1998.
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*/
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if( pathname[0] != '/' ) {
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(void)getcwd( fullpath, PATH_MAX );
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(void)strncat( fullpath, "/", PATH_MAX );
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(void)strncat( fullpath, pathname, PATH_MAX );
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if( Py_VerboseFlag ) {
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printf( "load_add_on( %s )\n", fullpath );
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}
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} else {
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(void)strcpy( fullpath, pathname );
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}
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the_id = load_add_on( fullpath );
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if( the_id < B_NO_ERROR ) {
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/* It's too bad load_add_on() doesn't set errno or something...
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*/
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char buff[256]; /* hate hard-coded string sizes... */
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if( Py_VerboseFlag ) {
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printf( "load_add_on( %s ) failed", fullpath );
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}
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switch( the_id ) {
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case B_ERROR:
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sprintf( buff, "BeOS: Failed to load %.200s", fullpath );
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break;
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default:
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sprintf( buff, "Unknown error loading %.200s", fullpath );
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break;
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}
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PyErr_SetString( PyExc_ImportError, buff );
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return NULL;
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}
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if( Py_VerboseFlag ) {
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printf( "get_image_symbol( %s )\n", funcname );
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}
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retval = get_image_symbol( the_id, funcname, B_SYMBOL_TYPE_TEXT, &p );
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if( retval != B_NO_ERROR || p == NULL ) {
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/* That's bad, we can't find that symbol in the module...
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*/
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char buff[256]; /* hate hard-coded string sizes... */
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if( Py_VerboseFlag ) {
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printf( "get_image_symbol( %s ) failed", funcname );
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}
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switch( retval ) {
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case B_BAD_IMAGE_ID:
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sprintf( buff, "can't load init function for dynamic module: "
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"Invalid image ID for %.180s", fullpath );
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break;
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case B_BAD_INDEX:
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sprintf( buff, "can't load init function for dynamic module: "
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"Bad index for %.180s", funcname );
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break;
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default:
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sprintf( buff, "can't load init function for dynamic module: "
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"Unknown error looking up %.180s", funcname );
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break;
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}
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retval = unload_add_on( the_id );
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PyErr_SetString( PyExc_ImportError, buff );
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return NULL;
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}
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/* Save the module name and image ID for later so we can clean up
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* gracefully.
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*/
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beos_add_dyn( name, the_id );
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return p;
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}
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