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#ifndef lint
static char *RCSid = "$Id: library.c,v 1.19 2004/04/25 01:34:56 mark Exp $";
#endif
/*
* The Regina Rexx Interpreter
* Copyright (C) 1992-1994 Anders Christensen <anders@pvv.unit.no>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Sigh, let's live dangerously. We need to remove the definition of
* _POSIX_SOURCE, in order to get defined some extenstions to POSIX,
* since dynamic loading is not a part of POSIX.
*/
#include "regina_c.h"
#include "rexxsaa.h"
#define DONT_TYPEDEF_PFN
#ifdef HAVE_GCI
# include "gci/gci.h"
#endif
#include "rexx.h"
#include "rxiface.h"
#include <assert.h>
#include <string.h>
/*
* Starting after 3.3RC1 we process both the Rexx???Exe as the Rexx???Dll
* stuff here and only here. An Exe element is an element with a library of
* NULL.
*/
#define EP_COUNT 133 /* should be a prime for distribution */
#define FUNCS 0
#define EXITS 1
#define SUBCOMS 2
typedef struct { /* lib_tsd: static variables of this module (thread-safe) */
struct library * first_library;
struct library * orphaned;
struct entry_point *ep[3][EP_COUNT]; /* FUNCS, EXITS, SUBCOMS */
streng * err_message;
} lib_tsd_t; /* thread-specific but only needed by this module. see
* init_library
*/
/*
* init_library initializes the module.
* Currently, we set up the thread specific data.
* The function returns 1 on success, 0 if memory is short.
*/
int init_library( tsd_t *TSD )
{
lib_tsd_t *lt;
if ( TSD->lib_tsd != NULL )
return 1;
if ( ( lt = TSD->lib_tsd = MallocTSD( sizeof( lib_tsd_t ) ) ) == NULL )
return 0;
memset( lt, 0, sizeof( lib_tsd_t ) ); /* correct for all values */
return 1;
}
#ifdef DYNAMIC
/*
* insert_library inserts the passed library in the linked list of used
* libraries unconditionally.
*/
static void insert_library( const tsd_t *TSD, struct library *ptr )
{
lib_tsd_t *lt;
lt = TSD->lib_tsd;
ptr->prev = NULL;
ptr->next = lt->first_library;
lt->first_library = ptr;
if ( ptr->next != NULL )
ptr->next->prev = ptr;
}
/*
* unlink_orphaned_libs attempts to remove the address space from unused
* DLLs aka shared libraries.
*
* We must be extremely careful. Scenario:
* Load a function package, e.g. w32funcs. This lets several functions
* (e.g. win32func???) and win32load and win32unload been registered.
* When the call of win32unload happens, each function name gets unload and
* on the last call the entire library gets released. But this happens just
* when RexxDeregisterFunction(win32unload) happens! The address space doesn't
* exist any longer and the call does a return to unmapped memory. Crash!
*
* Therefore the freeing of the library moves the unused lib to the list of
* orphaned libs which are removed when it's safe to do so.
*
* Alternatively we have to maintain a list of used external entry points
* which lock the associated libraries only (move to orphaned), others are
* freed immediately. The disadvantage is the maintainance problem with
* longjmp/sigjmp.
*
* If the flag force is set we assume a clean state which should be set only
* on reforking or terminating.
*/
static void unlink_orphaned_libs( const tsd_t *TSD, lib_tsd_t *lt, int force )
{
struct library *ptr;
if ( !lt->orphaned )
return;
if ( !force )
{
/*
* The system is ready to remove every lib if TSD->systeminfo->previous
* is empty AND TSD->systeminfo->input_name is empty.
* Otherwise we don't catch the plain main() calls or other calls I can
* imagine that use the first systeminfo directly.
*/
if ( TSD->systeminfo )
{
if ( TSD->systeminfo->previous || TSD->systeminfo->input_file )
return;
}
}
while ( ( ptr = lt->orphaned ) != NULL )
{
lt->orphaned = ptr->next;
if ( lt->orphaned )
lt->orphaned->prev = NULL;
assert( ptr->used == 0 );
wrapper_unload( TSD, ptr->handle );
assert( ptr->name );
Free_stringTSD( ptr->name );
FreeTSD( ptr );
}
}
/*
* remove_library removes the passed library from the linked list of used
* libraries unconditionally.
* The library will be unloaded and the name and the passed structure will be
* freed later when it's safe to do so.
* See unlink_orphaned_libs.
*/
static void remove_library( const tsd_t *TSD, struct library *ptr )
{
lib_tsd_t *lt;
assert( ptr->used == 0 );
lt = TSD->lib_tsd;
if ( ptr->next )
ptr->next->prev = ptr->prev;
if ( ptr->prev )
ptr->prev->next = ptr->next;
else
lt->first_library = ptr->next;
ptr->next = lt->orphaned;
if ( lt->orphaned )
lt->orphaned->prev = ptr;
lt->orphaned = ptr;
/*
* Now try to remove it really.
*/
unlink_orphaned_libs( TSD, lt, 0 );
}
#endif
/*
* remove_entry removes the passed library entry from the linked list of used
* library entries unconditionally.
* The slot must be either FUNCS, EXISTS, or SUBCOMS.
* Used memory will be freed and the holding library will be removed if this
* entry was the last entry used of the library.
*/
static void remove_entry( tsd_t *TSD, struct entry_point *fptr, int slot )
{
lib_tsd_t *lt;
assert( slot >= FUNCS && slot <= SUBCOMS );
lt = TSD->lib_tsd;
if ( fptr->name )
Free_stringTSD( fptr->name );
#if defined(HAVE_GCI) && defined(DYNAMIC)
if ( ( fptr->special.gci_info != NULL ) && ( slot == FUNCS ) )
GCI_remove_structure( TSD, fptr->special.gci_info );
#endif
if ( fptr->next )
fptr->next->prev = fptr->prev;
if ( fptr->prev )
fptr->prev->next = fptr->next;
else
lt->ep[slot][fptr->hash % EP_COUNT] = fptr->next;
#ifdef DYNAMIC
if ( fptr->lib != NULL )
{
assert( fptr->lib->used > 0 );
if ( --fptr->lib->used == 0 )
remove_library( TSD, fptr->lib );
}
#endif
FreeTSD( fptr );
}
/*
* free_orphaned_libs disconnect from unused DLLs, see unlink_orphaned_libs.
*/
void free_orphaned_libs( tsd_t *TSD )
{
#ifdef DYNAMIC
lib_tsd_t *lt = TSD->lib_tsd;
unlink_orphaned_libs( TSD, lt, 0 );
#else
(TSD = TSD);
#endif
}
/*
* purge_library frees all used memory used by every entry point that is
* registered and unloads every library.
* This routine is a little bit slow.
*/
void purge_library( tsd_t *TSD )
{
struct entry_point *ep, *save_ep;
lib_tsd_t *lt;
int i, j;
lt = TSD->lib_tsd;
if ( lt->first_library != NULL )
{
for ( i = FUNCS; i <= SUBCOMS; i++ )
{
for ( j = 0; j < EP_COUNT; j++ )
{
if ( ( ep = lt->ep[i][j] ) != NULL )
{
do {
save_ep = ep;
remove_entry( TSD, ep, i );
if ( ( ep = lt->ep[i][j] ) == save_ep )
break;
} while ( ep != NULL );
if ( lt->first_library == NULL )
goto fastEnd;
}
}
}
}
fastEnd:
assert( lt->first_library == NULL );
lt->first_library = NULL;
#ifdef DYNAMIC
unlink_orphaned_libs( TSD, lt, 1 );
#endif
assert( lt->orphaned == NULL );
lt->orphaned = NULL;
memset( lt->ep, 0, sizeof( lt->ep ) );
}
#ifdef DYNAMIC
/*
* find_library returns the internal structure associated with the passed
* library name or NULL if such a library doesn't exists.
*/
struct library *find_library( const tsd_t *TSD, const streng *name )
{
struct library *lptr;
lib_tsd_t *lt;
lt = TSD->lib_tsd;
lptr = lt->first_library;
for ( ; lptr; lptr = lptr->next )
{
if ( !Str_cmp( name, lptr->name ) )
return lptr;
}
return NULL;
}
#endif
/*
* add_entry creates a new library entry from the passed data and inserts it
* in the linked list of used entries unconditionally.
* The slot must be either FUNCS, EXISTS, or SUBCOMS.
* rxname is the name that can be used by a REXX script.
* addr is the entry point of the function/exit hook/subcom hook.
* lptr is a loaded library or NULL for a call of RexxRegister???Exe.
* Either gci_info or user_area may be set depending on the kind of the entry.
*
* The internal counter of the library isn't incremented.
*/
static void add_entry( const tsd_t *TSD, int slot, const streng *rxname,
PFN addr, struct library *lptr, void *gci_info,
void *user_area )
{
int hash0;
lib_tsd_t *lt;
struct entry_point *fptr;
assert( slot >= FUNCS && slot <= SUBCOMS );
lt = TSD->lib_tsd;
fptr = MallocTSD( sizeof( struct entry_point ) );
fptr->name = Str_upper( Str_dupstrTSD( rxname ) );
fptr->hash = hashvalue( rxname->value, rxname->len );
fptr->addr = addr;
fptr->lib = lptr;
memset( &fptr->special, 0, sizeof( fptr->special ) );
if ( slot == FUNCS )
fptr->special.gci_info = gci_info;
else
{
if ( user_area != NULL )
memcpy( fptr->special.user_area, user_area,
sizeof ( fptr->special.user_area ) );
}
hash0 = fptr->hash % EP_COUNT;
fptr->next = lt->ep[slot][hash0];
lt->ep[slot][hash0] = fptr;
fptr->prev = NULL;
if ( fptr->next )
fptr->next->prev = fptr;
}
/*
* find_entry_point returns NULL if no entry is found. Returns the exact entry
* if both the name and the library match. Returns any entry with a fitting
* name if the library doesn't match but the name exists.
* library may be NULL for entries registered by RexxRegister???Exe.
* The slot must be either FUNCS, EXISTS, or SUBCOMS.
*/
static struct entry_point *find_entry_point( const tsd_t *TSD,
const streng *name,
void *library,
int slot )
{
struct entry_point *lptr;
unsigned hash, hash0;
lib_tsd_t *lt;
struct entry_point *retval = NULL;
lt = TSD->lib_tsd;
hash = hashvalue( name->value, name->len );
hash0 = hash % EP_COUNT;
for ( lptr = lt->ep[slot][hash0]; lptr; lptr = lptr->next )
{
if ( hash == lptr->hash )
if ( Str_cmp( name, lptr->name ) == 0 )
{
if ( lptr->lib == library )
return lptr;
else
retval = lptr;
}
}
return retval;
}
/*
* find_first_entry_point returns NULL if no entry is found and returns the
* most recent hook otherwise.
* The slot must be either FUNCS, EXISTS, or SUBCOMS.
*/
static struct entry_point *find_first_entry_point( const tsd_t *TSD,
const streng *name,
int slot )
{
struct entry_point *lptr;
unsigned hash, hash0;
lib_tsd_t *lt;
lt = TSD->lib_tsd;
hash = hashvalue( name->value, name->len );
hash0 = hash % EP_COUNT;
for ( lptr = lt->ep[slot][hash0]; lptr; lptr = lptr->next )
{
if ( hash == lptr->hash )
if ( Str_cmp( name, lptr->name ) == 0 )
return lptr;
}
return NULL;
}
/*
* find_all_entries returns 0 if no entry is found. Otherwise it returns the
* number of all matching entries with the given name, different in the module
* name only.
* The slot must be either FUNCS, EXISTS, or SUBCOMS.
* *list will be set to a list of all available entries.
*
* This function is slow.
*/
static int find_all_entries( const tsd_t *TSD, const streng *name, int slot,
struct entry_point ***list )
{
struct entry_point *lptr, **array;
unsigned hash, hash0;
lib_tsd_t *lt;
int cnt;
lt = TSD->lib_tsd;
hash = hashvalue( name->value, name->len );
hash0 = hash % EP_COUNT;
for ( cnt = 0, lptr = lt->ep[slot][hash0]; lptr; lptr = lptr->next )
{
if ( hash == lptr->hash )
if ( Str_cmp( name, lptr->name ) == 0 )
cnt++;
}
if ( cnt == 0 )
{
*list = NULL;
return 0;
}
array = MallocTSD( cnt * sizeof( struct entry_point * ) );
*list = array;
for ( cnt = 0, lptr = lt->ep[slot][hash0]; lptr; lptr = lptr->next )
{
if ( hash == lptr->hash )
if ( Str_cmp( name, lptr->name ) == 0 )
array[cnt++] = lptr;
}
return cnt;
}
/*
* set_err_message replaces the current error message by a new one that will
* be assembled as the concatenation of the two passed messages.
* The created string will be returned by RxFuncErrMsg().
*/
void set_err_message( const tsd_t *TSD, const char *message1,
const char *message2 )
{
lib_tsd_t *lt;
int size;
lt = TSD->lib_tsd;
if ( lt->err_message )
Free_stringTSD( lt->err_message );
size = strlen( message1 ) + strlen( message2 );
lt->err_message = Str_makeTSD( size + 1 );
if ( lt->err_message )
{
strcpy( lt->err_message->value, message1 );
strcat( lt->err_message->value, message2 );
lt->err_message->len = size;
}
}
/*
* load_entry creates a new library entry from the passed data and inserts it
* in the linked list of used entries.
* lptr is a loaded library or NULL for a call of RexxRegister???Exe.
* rxname is the name that can be used by a REXX script.
* objnam will be used if lptr != NULL only and is the name of the hook
* or function that is exported by the library.
* entry will be used if lptr == NULL only and is the entry point of the hook
* or function.
* The slot must be either FUNCS, EXISTS, or SUBCOMS.
* Either gci_info or user_area may be set depending on the kind of the entry.
*
* Return codes:
* 0 on success.
* 1 if the function is defined already.
* 1 if the hook is defined already and bound to the same library. The new
* hook is rejected.
* 2 if the hook is defined already and bound to another library. The new
* hook is accepted.
* 3 if objnam isn't exported by lptr.
* 4 if external libraries are not supported.
*/
static int load_entry( const tsd_t *TSD, struct library *lptr,
const streng *rxname, const streng *objnam, PFN entry,
int slot, void *gci_info, void *user_area )
{
int result=0;
struct entry_point *fptr;
assert( ( lptr != NULL ) ^ ( entry != NULL ) );
assert( rxname != NULL );
assert( slot >= FUNCS && slot <= SUBCOMS );
/*
* Check the exceptions first.
*/
if ( ( fptr = find_entry_point( TSD, rxname, lptr, slot ) ) != NULL )
{
/*
* EXITS and SUBCOMS may have the same callable name bound to different
* modules.
*/
if ( ( slot == FUNCS ) || ( fptr->lib == lptr ) )
return 1;
/*
* must be a hook with the same name in a different module.
*/
result = 2;
}
if ( lptr )
{
assert( objnam != NULL );
#ifdef DYNAMIC
if ( ( entry = wrapper_get_addr( TSD, lptr, objnam ) ) == NULL )
return 3;
lptr->used++;
#else
return 4;
#endif
}
add_entry( TSD, slot, rxname, entry, lptr, gci_info, user_area );
return result;
}
/*
* unload_entry removes a known library entry from the linked list of known
* entries.
*
* rxname is the name that can be used by a REXX script.
* module is the name of the library and may be NULL for a generic request
* or is a RexxRegister???Exe registered funcion/hook shall be unloaded.
* The slot must be either FUNCS, EXISTS, or SUBCOMS.
*
* Return codes:
* 0 on success.
* 1 if the function/hook is not defined or a hook with this name is bound
* to different modules and the module name is not given.
*/
static int unload_entry( tsd_t *TSD, const streng *rxname,
const streng *module, int slot )
{
struct entry_point *fptr, **list;
struct library *lib;
int cnt;
#ifdef DYNAMIC
if ( module == NULL )
lib = NULL;
else
{
if ( ( lib = find_library( TSD, module ) ) == NULL )
return 1;
}
#else
if ( module != NULL )
return 1;
lib = NULL;
#endif
fptr = find_entry_point( TSD, rxname, lib, slot );
if ( fptr == NULL )
return 1;
if ( fptr->lib == lib )
{
remove_entry( TSD, fptr, slot );
return 0;
}
/*
* Not a properly matching function. Check for the "wildcard" library.
*/
if ( lib != NULL )
return 1;
/*
* We need it the hard way. Check if more than one entry is registered.
*/
cnt = find_all_entries( TSD, rxname, slot, &list );
if ( cnt > 1 )
{
FreeTSD( list );
return 1;
}
remove_entry( TSD, *list, slot );
FreeTSD( list );
return 0;
}
/*
* loadrxfunc adds a new function to the set of registered entry points.
*
* lptr is a loaded library or NULL for a call of RexxRegisterFunctionExe.
* rxname is the name that can be used by a REXX script.
* objnam will be used if lptr != NULL only and is the name of the function
* that is exported by the library.
* entry will be used if lptr == NULL only and is the entry point of the
* function.
* gci_info may be set depending on whether RxFuncDefine is used.
*
* Returns a return code suitable for RexxRegisterFunction???.
*/
static int loadrxfunc( const tsd_t *TSD, struct library *lptr,
const streng *rxname, const streng *objnam, PFN entry,
void *gci_info )
{
int rc;
rc = load_entry( TSD, lptr, rxname, objnam, entry, FUNCS, gci_info, NULL );
switch ( rc )
{
case 0: return 0; /* RXFUNC_OK */
case 1: return 10; /* RXFUNC_DEFINED */
case 3: return 50; /* RXFUNC_ENTNOTFND */
case 4: return 60; /* RXFUNC_NOTINIT */
}
assert ( rc != 0 );
return 10000 + rc; /* something not recognisable */
}
/*
* loadrxhook adds a new exit/subcom hook to the set of registered entry
* points.
*
* lptr is a loaded library or NULL for a call of RexxRegister???Exe.
* rxname is the name that can be used in a hook list.
* objnam will be used if lptr != NULL only and is the name of the hook that
* that is exported by the library.
* entry will be used if lptr == NULL only and is the entry point of the hook.
* user_area is the passed parameter called UserArea of the Registration.
* The slot must be either EXISTS or SUBCOMS.
*
* Returns a return code suitable for RexxRegister???.
*/
static int loadrxhook( const tsd_t *TSD, struct library *lptr,
const streng *rxname, const streng *objnam, PFN entry,
void *user_area, int slot )
{
int rc;
rc = load_entry( TSD, lptr, rxname, objnam, entry, slot, NULL, user_area );
switch ( rc )
{
case 0: return 0; /* RX???_OK */
case 1: return 30; /* RX???_NOTREG */
case 2: return 10; /* RX???_DUP */
case 3: return 50; /* RX???_LOADERR */
case 4: return 1004; /* RX???_NOTINIT */
}
assert ( rc != 0 );
return 10000 + rc; /* something not recognisable */
}
/*
* unloadrxhook removes a registered function entry point.
*
* rxname is the name that can be used by a REXX script.
*
* Returns a return code suitable for RexxDeregisterFunction.
*/
static int unloadrxfunc( tsd_t *TSD, const streng *rxname )
{
assert( rxname != NULL );
if ( unload_entry( TSD, rxname, NULL, FUNCS ) == 0 )
return 0;
return 30; /* RXFUNC_NOTREG */
}
/*
* unloadrxhook removes a registered exit/subcom hook entry point.
*
* rxname is the name that can be used in a hook list.
* module is the name of the module that contains the hook or NULL if either
* the generic hook should be removed or if a RexxRegister???Exe-hook should
* be removed. The later one has precedence.
* The slot must be either EXISTS or SUBCOMS.
*
* Returns a return code suitable for RexxDeregister???.
*/
static int unloadrxhook( tsd_t *TSD, const streng *rxname,
const streng *module, int slot )
{
assert( rxname != NULL );
if ( unload_entry( TSD, rxname, module, slot ) == 0 )
return 0;
return 30; /* RX???_NOTREG */
}
/*
* rex_funcadd processes a RexxRegisterFunctionDll() or
* RexxRegisterFunctionExe() request.
*
* rxname is the name that can be used by a REXX script.
* module is the name of the library and may be NULL only a
* RexxRegisterFunctionExe is processed.
* objnam will be used if module != NULL only and is the name of the function
* that is exported by the library.
* entry will be used if module == NULL only and is the entry point of the
* function.
* gci_info may be set depending on whether RxFuncDefine is used.
*
* Returns a return code suitable for RexxRegisterFunction???.
*/
static int rex_funcadd( const tsd_t *TSD, const streng *rxname,
const streng *module, const streng *objnam, PFN entry,
void *gci_info )
{
struct library *lptr=NULL;
int rc;
#ifdef DYNAMIC
void *handle;
int new = 0;
#endif
assert( rxname != NULL );
if ( module != NULL )
{
assert( entry == NULL );
#ifdef DYNAMIC
if ( ( lptr = find_library( TSD, module ) ) == NULL )
{
new = 1;
handle = wrapper_load( TSD, module ) ;
if ( handle )
{
lptr = MallocTSD( sizeof( struct library )) ;
lptr->name = Str_dupstrTSD( module ) ;
lptr->handle = handle ;
lptr->used = 0l;
}
else
{
return 40; /* RXFUNC_MODNOTFND */
}
insert_library( TSD, lptr ) ;
}
#else
return 60; /* RXFUNC_NOTINIT */
#endif
}
else
{
assert( entry != NULL );
}
if ( ( rc = loadrxfunc( TSD, lptr, rxname, objnam, entry, gci_info ) ) != 0 )
{
#ifdef DYNAMIC
if ( new )
remove_library( TSD, lptr );
#endif
}
return rc;
}
/*
* rex_hookadd processes a RexxRegisterExitDll(), RexxRegisterExitExe(),
* RexxRegisterSubcomDll(), or RexxRegisterSubcomExe() request.
*
* rxname is the name that can be used in a hook list.
* module is the name of the library and may be NULL only a RexxRegister???Exe
* is processed.
* objnam will be used if module != NULL only and is the name of the hook
* that is exported by the library.
* entry will be used if module == NULL only and is the entry point of the
* hook.
* user_area is the passed parameter called UserArea of the Registration.
* The slot must be either EXISTS or SUBCOMS.
*
* Returns a return code suitable for RexxRegister???.
*/
static int rex_hookadd( const tsd_t *TSD, const streng *rxname,
const streng *module, const streng *objnam, PFN entry,
void *user_area, int slot )
{
struct library *lptr=NULL;
int rc;
#ifdef DYNAMIC
void *handle;
int new = 0;
#endif
assert( rxname != NULL );
if ( module != NULL )
{
assert( entry == NULL );
#ifdef DYNAMIC
if ( ( lptr = find_library( TSD, module ) ) == NULL )
{
new = 1;
handle = wrapper_load( TSD, module ) ;
if ( handle )
{
lptr = MallocTSD( sizeof( struct library )) ;
lptr->name = Str_dupstrTSD( module ) ;
lptr->handle = handle ;
lptr->used = 0l;
}
else
{
return 50; /* RX???_LOADERR */
}
insert_library( TSD, lptr ) ;
}
#else
return 1004; /* RX???_NOTINIT */
#endif
}
else
{
assert( entry != NULL );
}
rc = loadrxhook( TSD, lptr, rxname, objnam, entry, user_area, slot );
if ( ( rc != 0 ) && ( rc != 10 ) )
{
#ifdef DYNAMIC
if ( new )
remove_library( TSD, lptr );
#endif
}
return rc;
}
/*
* rex_rxfuncerrmsg implements the BIF RxFuncErrMsg.
*/
streng *rex_rxfuncerrmsg( tsd_t *TSD, cparamboxptr parms )
{
#ifdef DYNAMIC
lib_tsd_t *lt;
#endif
checkparam( parms, 0, 0, "RXFUNCERRMSG" );
#ifdef DYNAMIC
lt = TSD->lib_tsd;
if ( lt->err_message )
return Str_dupTSD( lt->err_message );
else
return nullstringptr();
#else
return Str_creTSD( "Platform doesn't support dynamic linking" );
#endif
}
/*
* rex_rxfuncquery implements the BIF RxFuncQuery.
*/
streng *rex_rxfuncquery( tsd_t *TSD, cparamboxptr parms )
{
#ifdef DYNAMIC
streng *name;
struct entry_point *fptr;
#endif
checkparam( parms, 1, 1, "RXFUNCQUERY" );
#ifdef DYNAMIC
name = Str_upper( Str_dupTSD( parms->value ) );
fptr = find_entry_point( TSD, name, NULL, FUNCS );
Free_stringTSD( name );
if ( fptr )
return int_to_streng( TSD, 0 );
/*
* FIXME: We have to discuss whether to return a stupid 1 or a
* more informational 30/60 for RXFUNC_NOTREG or RXFUNC_NOTINIT
*/
/* return int_to_streng( TSD, 30 ); */ /* RXFUNC_NOTREG */
return int_to_streng( TSD, 1 );
#else
/* return int_to_streng( TSD, 60 ); */ /* RXFUNC_NOTINIT */
return int_to_streng( TSD, 1 );
#endif
}
/*
* rex_rxfuncadd implements the BIF RxFuncAdd.
* The returned value is suitable for RexxRegisterFunctionDll.
*
* Parameters:
* 1) name of the function to be added (in Rexx)
* 2) name of object file to link in
* 3) name of the function to be added (in the object file)
*/
streng *rex_rxfuncadd( tsd_t *TSD, cparamboxptr parms )
{
#ifdef DYNAMIC
streng *rxname;
streng *module, *objnam;
int rc;
#endif
if ( TSD->restricted )
exiterror( ERR_RESTRICTED, 1, "RXFUNCADD" );
checkparam( parms, 2, 3, "RXFUNCADD" );
#ifdef DYNAMIC
rxname = Str_upper( Str_dupTSD( parms->value ) );
objnam = parms->value;
module = ( parms = parms->next )->value;
if ( ( parms->next != NULL ) && ( parms->next->value != NULL ) )
objnam = parms->next->value;
rc = rex_funcadd( TSD, rxname, module, objnam, NULL, NULL );
Free_stringTSD( rxname );
return int_to_streng( TSD, rc );
#else
return int_to_streng( TSD, 60 ); /* RXFUNC_NOTINIT */
#endif
}
#ifdef HAVE_GCI
/*
* rex_rxfuncdefine implements the BIF RxFuncDefine.
*
* parameters:
* 1) name of the function to be added (in Rexx)
* 2) name of object file to link in
* 3) name of the function to be added (in the object file)
* 4) name of a stem containing the definition of the function
*/
streng *rex_rxfuncdefine( tsd_t *TSD, cparamboxptr parms )
{
#ifdef DYNAMIC
streng *rxname,*module,*objnam,*def_stem;
void *gci_info;
int rc;
#endif
if ( TSD->restricted )
exiterror( ERR_RESTRICTED, 1, "RXFUNCDEFINE" );
checkparam( parms, 4, 4, "RXFUNCDEFINE" );
#ifdef DYNAMIC
rxname = Str_upper( Str_dupTSD( parms->value ) );
objnam = parms->value;
module = ( parms = parms->next )->value;
parms = parms->next;
if ( parms->value != NULL )
objnam = parms->value;
def_stem = parms->next->value;
if ( ( rc = GCI_checkDefinition( TSD, def_stem, &gci_info ) ) != 0 )
{
Free_stringTSD( rxname );
return int_to_streng( TSD, 1 );
}
rc = rex_funcadd( TSD, rxname, module, objnam, NULL, gci_info );
Free_stringTSD( rxname );
if ( rc )
GCI_remove_structure( TSD, gci_info );
return int_to_streng( TSD, rc );
#else
return int_to_streng( TSD, 60 ); /* RXFUNC_NOTINIT */
#endif
}
#endif
/*
* rex_rxfuncdrop implements the BIF RxFuncDrop.
* The returned value is suitable for RexxDeregisterFunction.
*/
streng *rex_rxfuncdrop( tsd_t *TSD, cparamboxptr parms )
{
streng *name;
checkparam( parms, 1, 1, "RXFUNCDROP" );
name = Str_upper( parms->value );
return int_to_streng( TSD, unloadrxfunc( TSD, name ) );
}
/*
* IfcRegFunc is the interface function for RexxRegisterFunctionExe and
* RexxRegisterFunctionDll.
* Either entry or module and objnam must be set.
*/
int IfcRegFunc( const tsd_t *TSD, const char *rxname, const char *module,
const char *objnam, PFN entry )
{
int rc;
streng *ext;
streng *intr=NULL;
streng *lib=NULL;
ext = Str_upper( Str_creTSD( rxname ) );
if ( module && objnam )
{
intr = Str_creTSD( objnam );
lib = Str_creTSD( module );
}
rc = rex_funcadd( TSD, ext, lib, intr, entry, NULL );
Free_stringTSD( ext );
if ( intr && lib )
{
Free_stringTSD( intr );
Free_stringTSD( lib );
}
return rc;
}
/*
* IfcRegHook is the interface function for RexxRegisterExitExe,
* RexxRegisterExitDll, RexxRegisterSubcomExe, RexxRegisterSubcomtDll.
* Either entry or module and objnam must be set.
*/
static int IfcRegHook( const tsd_t *TSD, const char *rxname,
const char *module, const char *objnam, PFN entry,
void *user_area, int slot )
{
int rc;
streng *ext;
streng *intr=NULL;
streng *lib=NULL;
ext = Str_upper( Str_creTSD( rxname ) );
if ( module && objnam )
{
intr = Str_creTSD( objnam );
lib = Str_creTSD( module );
}
rc = rex_hookadd( TSD, ext, lib, intr, entry, user_area, slot );
Free_stringTSD( ext );
if ( intr && lib )
{
Free_stringTSD( intr );
Free_stringTSD( lib );
}
return rc;
}
/*
* IfcRegExit is the interface function for RexxRegisterExitExe or
* RexxRegisterExitDll.
* Either entry or module and objnam must be set.
*/
int IfcRegExit( const tsd_t *TSD, const char *rxname, const char *module,
const char *objnam, PFN entry, void *user_area )
{
return IfcRegHook( TSD, rxname, module, objnam, entry, user_area, EXITS );
}
/*
* IfcRegSubcom is the interface function for RexxRegisterSubcomExe or
* RexxRegisterSubcomDll.
* Either entry or module and objnam must be set.
*/
int IfcRegSubcom( const tsd_t *TSD, const char *rxname, const char *module,
const char *objnam, PFN entry, void *user_area )
{
return IfcRegHook( TSD, rxname, module, objnam, entry, user_area, SUBCOMS );
}
/*
* IfcDelFunc is the interface function for RexxDeregisterFunction.
*/
int IfcDelFunc( tsd_t *TSD, const char *rxname )
{
int rc;
streng *ext;
ext = Str_upper( Str_creTSD( rxname ) );
rc = unloadrxfunc( TSD, ext );
Free_stringTSD( ext );
return rc;
}
/*
* IfcDelHook is the interface function for RexxDeregisterExit or
* RexxDeregisterSubcom.
*/
static int IfcDelHook( tsd_t *TSD, const char *rxname, const char *module,
int slot )
{
int rc;
streng *ext,*mod;
ext = Str_upper( Str_creTSD( rxname ) );
if ( module != NULL )
mod = Str_creTSD( module );
else
mod = NULL;
rc = unloadrxhook( TSD, ext, mod, slot );
Free_stringTSD( ext );
if ( mod != NULL )
Free_stringTSD( mod );
return rc;
}
/*
* IfcDelExit is the interface function for RexxDeregisterExit.
*/
int IfcDelExit( tsd_t *TSD, const char *rxname, const char *module )
{
return IfcDelHook( TSD, rxname, module, EXITS );
}
/*
* IfcDelSubcom is the interface function for RexxDeregisterSubcom.
*/
int IfcDelSubcom( tsd_t *TSD, const char *rxname, const char *module )
{
return IfcDelHook( TSD, rxname, module, SUBCOMS );
}
/*
* IfcQueryFunc is the interface function for RexxQueryFunction.
*/
int IfcQueryFunc( const tsd_t *TSD, const char *rxname )
{
int rc;
streng *ext;
ext = Str_upper( Str_creTSD( rxname ) );
rc = ( find_entry_point( TSD, ext, NULL, FUNCS ) != NULL ) ? 0 : 30;
Free_stringTSD( ext );
return rc;
}
/*
* IfcQueryHook is the interface function for RexxQueryExit or RexxQuerySubcom.
*/
static int IfcQueryHook( const tsd_t *TSD, const char *rxname,
const char *module, int slot, void *user_area )
{
streng *ext;
struct entry_point *fptr,**list;
struct library *lib;
int cnt;
#ifdef DYNAMIC
streng *mod;
#endif
ext = Str_upper( Str_creTSD( rxname ) );
if ( module != NULL )
{
#ifdef DYNAMIC
mod = Str_creTSD( module );
lib = find_library( TSD, mod );
Free_stringTSD( mod );
if ( lib == NULL )
{
Free_stringTSD( ext );
return 30; /* RX???_NOTREG */
}
#else
return 1004; /* RX???_NOTINIT */
#endif
}
else
lib = NULL;
fptr = find_entry_point( TSD, ext, lib, slot );
if ( fptr == NULL )
{
Free_stringTSD( ext );
return 30; /* RX???_NOTREG */
}
if ( fptr->lib != lib )
{
/*
* Found via wildcard mechanism, check if more than one element exists
* and if a wildcard is allowed.
*/
if ( lib != NULL )
{
Free_stringTSD( ext );
return 30; /* RX???_NOTREG */
}
cnt = find_all_entries( TSD, ext, slot, &list );
FreeTSD( list );
Free_stringTSD( ext );
if ( cnt > 1 )
return 30; /* RX???_NOTREG */
}
else
Free_stringTSD( ext );
if ( user_area != NULL )
memcpy( user_area, fptr->special.user_area,
sizeof ( fptr->special.user_area ) );
return 0;
}
/*
* IfcQueryExit is the interface function for RexxQueryExit.
*/
int IfcQueryExit( const tsd_t *TSD, const char *rxname, const char *module,
void *user_area )
{
return IfcQueryHook( TSD, rxname, module, EXITS, user_area );
}
/*
* IfcQuerySubcom is the interface function for RexxQuerySubcom.
*/
int IfcQuerySubcom( const tsd_t *TSD, const char *rxname, const char *module,
void *user_area )
{
return IfcQueryHook( TSD, rxname, module, SUBCOMS, user_area );
}
struct entry_point *loaded_lib_func( const tsd_t *TSD, const streng *name )
{
struct entry_point *box;
streng *upp;
upp = Str_upper( Str_dupTSD( name ) );
box = find_first_entry_point( TSD, upp, FUNCS );
Free_stringTSD( upp );
return box;
}
/*
* exit_hook returns the most recent exit handler of the given name.
* The value may be NULL if no hook is registered.
*/
struct entry_point *exit_hook( const tsd_t *TSD, const char *env, int len )
{
streng *name;
struct entry_point *ret;
name = Str_upper( Str_ncreTSD( env, len ) );
ret = find_first_entry_point( TSD, name, EXITS );
Free_stringTSD( name );
return ret;
}
/*
* subcom_hook returns the most recent subcom handler of the given name.
* The value may be NULL if no hook is registered.
*/
struct entry_point *subcom_hook( const tsd_t *TSD, const char *com, int len )
{
streng *name;
struct entry_point *ret;
name = Str_upper( Str_ncreTSD( com, len ) );
ret = find_first_entry_point( TSD, name, SUBCOMS );
Free_stringTSD( name );
return ret;
}
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