357 lines
13 KiB
Plaintext
357 lines
13 KiB
Plaintext
/* dl_vms.xs
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*
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* Platform: OpenVMS, VAX or AXP
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* Author: Charles Bailey bailey@genetics.upenn.edu
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* Revised: 12-Dec-1994
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*
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* Implementation Note
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* This section is added as an aid to users and DynaLoader developers, in
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* order to clarify the process of dynamic linking under VMS.
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* dl_vms.xs uses the supported VMS dynamic linking call, which allows
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* a running program to map an arbitrary file of executable code and call
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* routines within that file. This is done via the VMS RTL routine
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* lib$find_image_symbol, whose calling sequence is as follows:
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* status = lib$find_image_symbol(imgname,symname,symval,defspec);
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* where
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* status = a standard VMS status value (unsigned long int)
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* imgname = a fixed-length string descriptor, passed by
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* reference, containing the NAME ONLY of the image
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* file to be mapped. An attempt will be made to
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* translate this string as a logical name, so it may
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* not contain any characters which are not allowed in
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* logical names. If no translation is found, imgname
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* is used directly as the name of the image file.
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* symname = a fixed-length string descriptor, passed by
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* reference, containing the name of the routine
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* to be located.
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* symval = an unsigned long int, passed by reference, into
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* which is written the entry point address of the
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* routine whose name is specified in symname.
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* defspec = a fixed-length string descriptor, passed by
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* reference, containing a default file specification
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* whichis used to fill in any missing parts of the
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* image file specification after the imgname argument
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* is processed.
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* In order to accommodate the handling of the imgname argument, the routine
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* dl_expandspec() is provided for use by perl code (e.g. dl_findfile)
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* which wants to see what image file lib$find_image_symbol would use if
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* it were passed a given file specification. The file specification passed
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* to dl_expandspec() and dl_load_file() can be partial or complete, and can
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* use VMS or Unix syntax; these routines perform the necessary conversions.
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* In general, writers of perl extensions need only conform to the
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* procedures set out in the DynaLoader documentation, and let the details
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* be taken care of by the routines here and in DynaLoader.pm. If anyone
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* comes across any incompatibilities, please let me know. Thanks.
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*
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*/
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#include "EXTERN.h"
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#include "perl.h"
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#include "XSUB.h"
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#include "dlutils.c" /* dl_debug, LastError; SaveError not used */
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static AV *dl_require_symbols = Nullav;
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/* N.B.:
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* dl_debug and LastError are static vars; you'll need to deal
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* with them appropriately if you need context independence
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*/
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#include <descrip.h>
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#include <fscndef.h>
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#include <lib$routines.h>
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#include <rms.h>
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#include <ssdef.h>
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#include <starlet.h>
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typedef unsigned long int vmssts;
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struct libref {
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struct dsc$descriptor_s name;
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struct dsc$descriptor_s defspec;
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};
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/* Static data for dl_expand_filespec() - This is static to save
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* initialization on each call; if you need context-independence,
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* just make these auto variables in dl_expandspec() and dl_load_file()
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*/
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static char dlesa[NAM$C_MAXRSS], dlrsa[NAM$C_MAXRSS];
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static struct FAB dlfab;
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static struct NAM dlnam;
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/* $PutMsg action routine - records error message in LastError */
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static vmssts
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copy_errmsg(msg,unused)
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struct dsc$descriptor_s * msg;
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vmssts unused;
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{
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if (*(msg->dsc$a_pointer) == '%') { /* first line */
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if (LastError)
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strncpy((LastError = saferealloc(LastError,msg->dsc$w_length+1)),
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msg->dsc$a_pointer, msg->dsc$w_length);
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else
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strncpy((LastError = safemalloc(msg->dsc$w_length+1)),
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msg->dsc$a_pointer, msg->dsc$w_length);
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LastError[msg->dsc$w_length] = '\0';
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}
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else { /* continuation line */
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int errlen = strlen(LastError);
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LastError = saferealloc(LastError, errlen + msg->dsc$w_length + 2);
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LastError[errlen] = '\n'; LastError[errlen+1] = '\0';
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strncat(LastError, msg->dsc$a_pointer, msg->dsc$w_length);
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LastError[errlen+msg->dsc$w_length+1] = '\0';
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}
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return 0;
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}
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/* Use $PutMsg to retrieve error message for failure status code */
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static void
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dl_set_error(sts,stv)
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vmssts sts;
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vmssts stv;
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{
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vmssts vec[3];
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vec[0] = stv ? 2 : 1;
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vec[1] = sts; vec[2] = stv;
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_ckvmssts(sys$putmsg(vec,copy_errmsg,0,0));
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}
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static unsigned int
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findsym_handler(void *sig, void *mech)
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{
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unsigned long int myvec[8],args, *usig = (unsigned long int *) sig;
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/* Be paranoid and assume signal vector passed in might be readonly */
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myvec[0] = args = usig[0] > 10 ? 9 : usig[0] - 1;
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while (--args) myvec[args] = usig[args];
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_ckvmssts(sys$putmsg(myvec,copy_errmsg,0,0));
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "findsym_handler: received\n\t%s\n",LastError));
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return SS$_CONTINUE;
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}
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/* wrapper for lib$find_image_symbol, so signalled errors can be saved
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* for dl_error and then returned */
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static unsigned long int
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my_find_image_symbol(struct dsc$descriptor_s *imgname,
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struct dsc$descriptor_s *symname,
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void (**entry)(),
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struct dsc$descriptor_s *defspec)
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{
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unsigned long int retsts;
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VAXC$ESTABLISH(findsym_handler);
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retsts = lib$find_image_symbol(imgname,symname,entry,defspec);
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return retsts;
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}
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static void
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dl_private_init()
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{
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dl_generic_private_init();
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dl_require_symbols = perl_get_av("DynaLoader::dl_require_symbols", 0x4);
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/* Set up the static control blocks for dl_expand_filespec() */
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dlfab = cc$rms_fab;
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dlnam = cc$rms_nam;
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dlfab.fab$l_nam = &dlnam;
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dlnam.nam$l_esa = dlesa;
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dlnam.nam$b_ess = sizeof dlesa;
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dlnam.nam$l_rsa = dlrsa;
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dlnam.nam$b_rss = sizeof dlrsa;
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}
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MODULE = DynaLoader PACKAGE = DynaLoader
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BOOT:
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(void)dl_private_init();
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void
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dl_expandspec(filespec)
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char * filespec
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CODE:
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char vmsspec[NAM$C_MAXRSS], defspec[NAM$C_MAXRSS];
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size_t deflen;
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vmssts sts;
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tovmsspec(filespec,vmsspec);
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dlfab.fab$l_fna = vmsspec;
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dlfab.fab$b_fns = strlen(vmsspec);
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dlfab.fab$l_dna = 0;
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dlfab.fab$b_dns = 0;
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DLDEBUG(1,PerlIO_printf(PerlIO_stderr(), "dl_expand_filespec(%s):\n",vmsspec));
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/* On the first pass, just parse the specification string */
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dlnam.nam$b_nop = NAM$M_SYNCHK;
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sts = sys$parse(&dlfab);
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "\tSYNCHK sys$parse = %d\n",sts));
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if (!(sts & 1)) {
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dl_set_error(dlfab.fab$l_sts,dlfab.fab$l_stv);
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ST(0) = &PL_sv_undef;
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}
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else {
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/* Now set up a default spec - everything but the name */
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deflen = dlnam.nam$l_name - dlesa;
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memcpy(defspec,dlesa,deflen);
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memcpy(defspec+deflen,dlnam.nam$l_type,
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dlnam.nam$b_type + dlnam.nam$b_ver);
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deflen += dlnam.nam$b_type + dlnam.nam$b_ver;
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memcpy(vmsspec,dlnam.nam$l_name,dlnam.nam$b_name);
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "\tsplit filespec: name = %.*s, default = %.*s\n",
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dlnam.nam$b_name,vmsspec,deflen,defspec));
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/* . . . and go back to expand it */
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dlnam.nam$b_nop = 0;
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dlfab.fab$l_dna = defspec;
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dlfab.fab$b_dns = deflen;
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dlfab.fab$b_fns = dlnam.nam$b_name;
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sts = sys$parse(&dlfab);
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "\tname/default sys$parse = %d\n",sts));
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if (!(sts & 1)) {
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dl_set_error(dlfab.fab$l_sts,dlfab.fab$l_stv);
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ST(0) = &PL_sv_undef;
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}
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else {
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/* Now find the actual file */
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sts = sys$search(&dlfab);
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "\tsys$search = %d\n",sts));
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if (!(sts & 1)) {
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dl_set_error(dlfab.fab$l_sts,dlfab.fab$l_stv);
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ST(0) = &PL_sv_undef;
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}
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else {
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ST(0) = sv_2mortal(newSVpv(dlnam.nam$l_rsa,dlnam.nam$b_rsl));
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DLDEBUG(1,PerlIO_printf(PerlIO_stderr(), "\tresult = \\%.*s\\\n",
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dlnam.nam$b_rsl,dlnam.nam$l_rsa));
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}
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}
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}
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void
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dl_load_file(filespec, flags)
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char * filespec
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int flags
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PREINIT:
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char vmsspec[NAM$C_MAXRSS];
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SV *reqSV, **reqSVhndl;
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STRLEN deflen;
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struct dsc$descriptor_s
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specdsc = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0},
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symdsc = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0};
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struct fscnlst {
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unsigned short int len;
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unsigned short int code;
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char *string;
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} namlst[2] = {{0,FSCN$_NAME,0},{0,0,0}};
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struct libref *dlptr;
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vmssts sts, failed = 0;
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void (*entry)();
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CODE:
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DLDEBUG(1,PerlIO_printf(PerlIO_stderr(), "dl_load_file(%s,%x):\n", filespec,flags));
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specdsc.dsc$a_pointer = tovmsspec(filespec,vmsspec);
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specdsc.dsc$w_length = strlen(specdsc.dsc$a_pointer);
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "\tVMS-ified filespec is %s\n",
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specdsc.dsc$a_pointer));
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New(1399,dlptr,1,struct libref);
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dlptr->name.dsc$b_dtype = dlptr->defspec.dsc$b_dtype = DSC$K_DTYPE_T;
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dlptr->name.dsc$b_class = dlptr->defspec.dsc$b_class = DSC$K_CLASS_S;
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sts = sys$filescan(&specdsc,namlst,0);
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "\tsys$filescan: returns %d, name is %.*s\n",
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sts,namlst[0].len,namlst[0].string));
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if (!(sts & 1)) {
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failed = 1;
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dl_set_error(sts,0);
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}
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else {
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dlptr->name.dsc$w_length = namlst[0].len;
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dlptr->name.dsc$a_pointer = savepvn(namlst[0].string,namlst[0].len);
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dlptr->defspec.dsc$w_length = specdsc.dsc$w_length - namlst[0].len;
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New(1097, dlptr->defspec.dsc$a_pointer, dlptr->defspec.dsc$w_length + 1, char);
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deflen = namlst[0].string - specdsc.dsc$a_pointer;
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memcpy(dlptr->defspec.dsc$a_pointer,specdsc.dsc$a_pointer,deflen);
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memcpy(dlptr->defspec.dsc$a_pointer + deflen,
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namlst[0].string + namlst[0].len,
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dlptr->defspec.dsc$w_length - deflen);
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "\tlibref = name: %s, defspec: %.*s\n",
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dlptr->name.dsc$a_pointer,
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dlptr->defspec.dsc$w_length,
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dlptr->defspec.dsc$a_pointer));
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if (!(reqSVhndl = av_fetch(dl_require_symbols,0,FALSE)) || !(reqSV = *reqSVhndl)) {
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "\t@dl_require_symbols empty, returning untested libref\n"));
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}
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else {
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symdsc.dsc$w_length = SvCUR(reqSV);
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symdsc.dsc$a_pointer = SvPVX(reqSV);
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "\t$dl_require_symbols[0] = %.*s\n",
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symdsc.dsc$w_length, symdsc.dsc$a_pointer));
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sts = my_find_image_symbol(&(dlptr->name),&symdsc,
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&entry,&(dlptr->defspec));
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "\tlib$find_image_symbol returns %d\n",sts));
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if (!(sts&1)) {
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failed = 1;
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dl_set_error(sts,0);
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}
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}
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}
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if (failed) {
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Safefree(dlptr->name.dsc$a_pointer);
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Safefree(dlptr->defspec.dsc$a_pointer);
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Safefree(dlptr);
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ST(0) = &PL_sv_undef;
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}
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else {
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ST(0) = sv_2mortal(newSViv((IV) dlptr));
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}
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void
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dl_find_symbol(librefptr,symname)
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void * librefptr
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SV * symname
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CODE:
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struct libref thislib = *((struct libref *)librefptr);
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struct dsc$descriptor_s
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symdsc = {SvCUR(symname),DSC$K_DTYPE_T,DSC$K_CLASS_S,SvPVX(symname)};
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void (*entry)();
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vmssts sts;
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DLDEBUG(1,PerlIO_printf(PerlIO_stderr(), "dl_find_dymbol(%.*s,%.*s):\n",
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thislib.name.dsc$w_length, thislib.name.dsc$a_pointer,
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symdsc.dsc$w_length,symdsc.dsc$a_pointer));
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sts = my_find_image_symbol(&(thislib.name),&symdsc,
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&entry,&(thislib.defspec));
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "\tlib$find_image_symbol returns %d\n",sts));
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "\tentry point is %d\n",
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(unsigned long int) entry));
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if (!(sts & 1)) {
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/* error message already saved by findsym_handler */
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ST(0) = &PL_sv_undef;
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}
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else ST(0) = sv_2mortal(newSViv((IV) entry));
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void
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dl_undef_symbols()
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PPCODE:
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# These functions should not need changing on any platform:
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void
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dl_install_xsub(perl_name, symref, filename="$Package")
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char * perl_name
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void * symref
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char * filename
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CODE:
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_install_xsub(name=%s, symref=%x)\n",
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perl_name, symref));
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ST(0)=sv_2mortal(newRV((SV*)newXS(perl_name, (void(*)())symref, filename)));
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char *
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dl_error()
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CODE:
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RETVAL = LastError ;
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OUTPUT:
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RETVAL
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# end.
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