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/* dl_symbian.xs
*
* Platform: Symbian 7.0s
* Author: Jarkko Hietaniemi <jarkko.hietaniemi@nokia.com>
* Copyright: 2004, Nokia
* License: Artistic/GPL
*
*/
/*
* In Symbian DLLs there is no name information, one can only access
* the functions by their ordinals. Perl, however, very much would like
* to load functions by their names. We fake this by having a special
* setup function at the ordinal 1 (this is arranged by building the DLLs
* in a special way). The setup function builds a Perl hash mapping the
* names to the ordinals, and the hash is then used by dlsym().
*
*/
#include <e32base.h>
#include <eikdll.h>
#include <utf.h>
/* This is a useful pattern: first include the Symbian headers,
* only after that the Perl ones. Otherwise you will get a lot
* trouble because of Symbian's New(), Copy(), etc definitions. */
#define DL_SYMBIAN_XS
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
START_EXTERN_C
void *dlopen(const char *filename, int flag);
void *dlsym(void *handle, const char *symbol);
int dlclose(void *handle);
const char *dlerror(void);
extern void* memset(void *s, int c, size_t n);
extern size_t strlen(const char *s);
END_EXTERN_C
#include "dlutils.c"
#define RTLD_LAZY 0x0001
#define RTLD_NOW 0x0002
#define RTLD_GLOBAL 0x0004
#ifndef NULL
# define NULL 0
#endif
/* No need to pull in symbian_dll.cpp for this. */
#define symbian_get_vars() ((void*)Dll::Tls())
const TInt KPerlDllSetupFunction = 1;
typedef struct {
RLibrary handle;
TInt error;
HV* symbols;
} PerlSymbianLibHandle;
typedef void (*PerlSymbianLibInit)(void *);
void* dlopen(const char *filename, int flags) {
TBuf16<KMaxFileName> utf16fn;
const TUint8* utf8fn = (const TUint8*)filename;
PerlSymbianLibHandle* h = NULL;
TInt error;
error =
CnvUtfConverter::ConvertToUnicodeFromUtf8(utf16fn, TPtrC8(utf8fn));
if (error == KErrNone) {
h = new PerlSymbianLibHandle;
if (h) {
h->error = KErrNone;
h->symbols = Nullhv;
} else
error = KErrNoMemory;
}
if (h && error == KErrNone) {
error = (h->handle).Load(utf16fn);
if (error == KErrNone) {
TLibraryFunction init = (h->handle).Lookup(KPerlDllSetupFunction);
((PerlSymbianLibInit)init)(h);
} else {
free(h);
h = NULL;
}
}
if (h)
h->error = error;
return h;
}
void* dlsym(void *handle, const char *symbol) {
if (handle) {
dTHX;
PerlSymbianLibHandle* h = (PerlSymbianLibHandle*)handle;
HV* symbols = h->symbols;
if (symbols) {
SV** svp = hv_fetch(symbols, symbol, strlen(symbol), FALSE);
if (svp && *svp && SvIOK(*svp)) {
IV ord = SvIV(*svp);
if (ord > 0)
return (void*)((h->handle).Lookup(ord));
}
}
}
return NULL;
}
int dlclose(void *handle) {
PerlSymbianLibHandle* h = (PerlSymbianLibHandle*)handle;
if (h) {
(h->handle).Close();
if (h->symbols) {
dTHX;
hv_undef(h->symbols);
h->symbols = NULL;
}
return 0;
} else
return 1;
}
const char* dlerror(void) {
return 0; /* Bad interface: assumes static data. */
}
static void
dl_private_init(pTHX)
{
(void)dl_generic_private_init(aTHX);
}
MODULE = DynaLoader PACKAGE = DynaLoader
PROTOTYPES: ENABLE
BOOT:
(void)dl_private_init(aTHX);
void
dl_load_file(filename, flags=0)
char * filename
int flags
PREINIT:
PerlSymbianLibHandle* h;
CODE:
{
ST(0) = sv_newmortal();
h = (PerlSymbianLibHandle*)dlopen(filename, flags);
if (h && h->error == KErrNone)
sv_setiv(ST(0), PTR2IV(h));
else
PerlIO_printf(Perl_debug_log, "(dl_load_file %s %d)",
filename, h ? h->error : -1);
}
int
dl_unload_file(libhandle)
void * libhandle
CODE:
RETVAL = (dlclose(libhandle) == 0 ? 1 : 0);
OUTPUT:
RETVAL
void
dl_find_symbol(libhandle, symbolname)
void * libhandle
char * symbolname
PREINIT:
void *sym;
CODE:
PerlSymbianLibHandle* h = (PerlSymbianLibHandle*)libhandle;
sym = dlsym(libhandle, symbolname);
ST(0) = sv_newmortal();
if (sym)
sv_setiv(ST(0), PTR2IV(sym));
else
PerlIO_printf(Perl_debug_log, "(dl_find_symbol %s %d)",
symbolname, h ? h->error : -1);
void
dl_undef_symbols()
CODE:
# These functions should not need changing on any platform:
void
dl_install_xsub(perl_name, symref, filename="$Package")
char * perl_name
void * symref
char * filename
CODE:
ST(0) = sv_2mortal(newRV((SV*)newXS(perl_name,
(void(*)(pTHX_ CV *))symref,
filename)));
char *
dl_error()
CODE:
dMY_CXT;
RETVAL = dl_last_error;
OUTPUT:
RETVAL
# end.
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