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yap-6.3/C/load_shl.c

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#include "Yap.h"
#include "Yatom.h"
#include "Heap.h"
#include "yapio.h"
#include "Foreign.h"
#if LOAD_SHL
#include <dl.h>
#include <malloc.h>
#include <stdio.h>
/*
* YAP_FindExecutable(argv[0]) should be called on yap initialization to
* locate the executable of Yap
*/
void Yap_FindExecutable(char *name)
{
}
/*
* LoadForeign(ofiles,libs,proc_name,init_proc) dynamically loads foreign
* code files and libraries and locates an initialization routine
*/
static Int
LoadForeign( StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc )
{
/* *init_proc is initialised to NULL in load_foreign.c */
int init_missing = -1;
int n, i;
struct shl_symbol *p;
while( ofiles ) {
int valid_fname;
/* shl_load wants to follow the LD_CONFIG_PATH */
valid_fname = Yap_TrueFileName( ofiles->s, Yap_FileNameBuf, TRUE );
if( !valid_fname ) {
strcpy( Yap_ErrorSay, "[ Trying to open non-existing file in LoadForeign ]" );
return LOAD_FAILLED;
}
ofiles->handle = Yap_AllocCodeSpace( sizeof(shl_t) );
*(shl_t *)ofiles->handle = shl_load( Yap_FileNameBuf, BIND_DEFERRED, 0 );
if( *(shl_t *)ofiles->handle == NULL ) {
strncpy( Yap_ErrorSay, strerror(errno), MAX_ERROR_MSG_SIZE );
return LOAD_FAILLED;
}
if( init_missing ) {
init_missing = shl_findsym( ofiles->handle, proc_name,
TYPE_PROCEDURE, init_proc );
}
ofiles = ofiles->next;
}
if( init_missing ) {
strcpy( Yap_ErrorSay, "Could not locate initialization routine" );
return LOAD_FAILLED;
}
while( libs ) {
if( libs->s[0] == '-' ) {
strcpy( Yap_FileNameBuf, "lib" );
strcat( Yap_FileNameBuf, libs->s+2 );
strcat( Yap_FileNameBuf, ".sl" );
}
else {
strcpy( Yap_FileNameBuf, libs->s );
}
*(shl_t *)libs->handle = shl_load( Yap_FileNameBuf, BIND_DEFERRED, 0 );
if( *(shl_t *)libs->handle == NULL ) {
strncpy( Yap_ErrorSay, strerror(errno), MAX_ERROR_MSG_SIZE );
return LOAD_FAILLED;
}
libs = libs->next;
}
return LOAD_SUCCEEDED;
}
Int
Yap_LoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
return LoadForeign(ofiles, libs, proc_name, init_proc);
}
void
Yap_ShutdownLoadForeign( void )
{
ForeignObj *f_code;
int err;
f_code = ForeignCodeLoaded;
while( f_code != NULL ) {
StringList objs, libs;
objs = f_code->objs;
while( objs ) {
err = shl_unload( *(shl_t *)objs->handle );
if( err ) {
/* dunno how to properly report an error here */
perror( NULL );
return;
}
Yap_FreeCodeSpace( objs->handle );
objs = objs->next;
}
libs = f_code->libs;
while( libs ) {
err = shl_unload( *(shl_t *)libs->handle );
if( err ) {
/* dunno how to properly report an error here */
perror( NULL );
return;
}
Yap_FreeCodeSpace( libs->handle );
libs = libs->next;
}
f_code = f_code->next;
}
}
Int
Yap_ReLoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
ShutdownLoadForeign();
return( LoadForeign( ofiles, libs, proc_name, init_proc ) );
}
/*
dunno what this one is supposed to do, no load_* defines it
void STD_PROTO(ReOpenLoadForeign,(void));
*/
#endif