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1 | /* dl_vms.xs |
2 | * |
3 | * Platform: OpenVMS, VAX or AXP |
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4 | * Author: Charles Bailey bailey@newman.upenn.edu |
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5 | * Revised: 12-Dec-1994 |
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6 | * |
7 | * Implementation Note |
8 | * This section is added as an aid to users and DynaLoader developers, in |
9 | * order to clarify the process of dynamic linking under VMS. |
10 | * dl_vms.xs uses the supported VMS dynamic linking call, which allows |
11 | * a running program to map an arbitrary file of executable code and call |
12 | * routines within that file. This is done via the VMS RTL routine |
13 | * lib$find_image_symbol, whose calling sequence is as follows: |
14 | * status = lib$find_image_symbol(imgname,symname,symval,defspec); |
15 | * where |
16 | * status = a standard VMS status value (unsigned long int) |
17 | * imgname = a fixed-length string descriptor, passed by |
18 | * reference, containing the NAME ONLY of the image |
19 | * file to be mapped. An attempt will be made to |
20 | * translate this string as a logical name, so it may |
21 | * not contain any characters which are not allowed in |
22 | * logical names. If no translation is found, imgname |
23 | * is used directly as the name of the image file. |
24 | * symname = a fixed-length string descriptor, passed by |
25 | * reference, containing the name of the routine |
26 | * to be located. |
27 | * symval = an unsigned long int, passed by reference, into |
28 | * which is written the entry point address of the |
29 | * routine whose name is specified in symname. |
30 | * defspec = a fixed-length string descriptor, passed by |
31 | * reference, containing a default file specification |
32 | * whichis used to fill in any missing parts of the |
33 | * image file specification after the imgname argument |
34 | * is processed. |
35 | * In order to accommodate the handling of the imgname argument, the routine |
36 | * dl_expandspec() is provided for use by perl code (e.g. dl_findfile) |
37 | * which wants to see what image file lib$find_image_symbol would use if |
38 | * it were passed a given file specification. The file specification passed |
39 | * to dl_expandspec() and dl_load_file() can be partial or complete, and can |
40 | * use VMS or Unix syntax; these routines perform the necessary conversions. |
41 | * In general, writers of perl extensions need only conform to the |
42 | * procedures set out in the DynaLoader documentation, and let the details |
43 | * be taken care of by the routines here and in DynaLoader.pm. If anyone |
44 | * comes across any incompatibilities, please let me know. Thanks. |
45 | * |
46 | */ |
47 | |
48 | #include "EXTERN.h" |
49 | #include "perl.h" |
50 | #include "XSUB.h" |
51 | |
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52 | /* N.B.: |
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53 | * dl_debug and dl_last_error are static vars; you'll need to deal |
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54 | * with them appropriately if you need context independence |
55 | */ |
56 | |
57 | #include <descrip.h> |
58 | #include <fscndef.h> |
59 | #include <lib$routines.h> |
60 | #include <rms.h> |
61 | #include <ssdef.h> |
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62 | #include <starlet.h> |
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63 | |
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64 | #if defined(VMS_WE_ARE_CASE_SENSITIVE) |
65 | #define DL_CASE_SENSITIVE 1<<4 |
66 | #else |
67 | #define DL_CASE_SENSITIVE 0 |
68 | #endif |
69 | |
a0d0e21e |
70 | typedef unsigned long int vmssts; |
71 | |
72 | struct libref { |
73 | struct dsc$descriptor_s name; |
74 | struct dsc$descriptor_s defspec; |
75 | }; |
76 | |
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77 | typedef struct { |
78 | AV * x_require_symbols; |
79 | /* "Static" data for dl_expand_filespec() - This is static to save |
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80 | * initialization on each call; if you need context-independence, |
81 | * just make these auto variables in dl_expandspec() and dl_load_file() |
82 | */ |
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83 | char x_esa[NAM$C_MAXRSS]; |
84 | char x_rsa[NAM$C_MAXRSS]; |
85 | struct FAB x_fab; |
86 | struct NAM x_nam; |
87 | } my_cxtx_t; /* this *must* be named my_cxtx_t */ |
88 | |
89 | #define DL_CXT_EXTRA /* ask for dl_cxtx to be defined in dlutils.c */ |
90 | #include "dlutils.c" /* dl_debug, dl_last_error; SaveError not used */ |
91 | |
92 | #define dl_require_symbols (dl_cxtx.x_require_symbols) |
93 | #define dl_esa (dl_cxtx.x_esa) |
94 | #define dl_rsa (dl_cxtx.x_rsa) |
95 | #define dl_fab (dl_cxtx.x_fab) |
96 | #define dl_nam (dl_cxtx.x_nam) |
97 | |
98 | /* $PutMsg action routine - records error message in dl_last_error */ |
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99 | static vmssts |
100 | copy_errmsg(msg,unused) |
101 | struct dsc$descriptor_s * msg; |
102 | vmssts unused; |
103 | { |
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104 | dTHX; |
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105 | dMY_CXT; |
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106 | if (*(msg->dsc$a_pointer) == '%') { /* first line */ |
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107 | if (dl_last_error) |
108 | strncpy((dl_last_error = saferealloc(dl_last_error,msg->dsc$w_length+1)), |
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109 | msg->dsc$a_pointer, msg->dsc$w_length); |
110 | else |
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111 | strncpy((dl_last_error = safemalloc(msg->dsc$w_length+1)), |
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112 | msg->dsc$a_pointer, msg->dsc$w_length); |
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113 | dl_last_error[msg->dsc$w_length] = '\0'; |
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114 | } |
115 | else { /* continuation line */ |
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116 | int errlen = strlen(dl_last_error); |
117 | dl_last_error = saferealloc(dl_last_error, errlen + msg->dsc$w_length + 2); |
118 | dl_last_error[errlen] = '\n'; dl_last_error[errlen+1] = '\0'; |
119 | strncat(dl_last_error, msg->dsc$a_pointer, msg->dsc$w_length); |
120 | dl_last_error[errlen+msg->dsc$w_length+1] = '\0'; |
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121 | } |
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122 | return 0; |
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123 | } |
124 | |
125 | /* Use $PutMsg to retrieve error message for failure status code */ |
126 | static void |
127 | dl_set_error(sts,stv) |
128 | vmssts sts; |
129 | vmssts stv; |
130 | { |
748a9306 |
131 | vmssts vec[3]; |
5c84aa53 |
132 | dTHX; |
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133 | |
134 | vec[0] = stv ? 2 : 1; |
135 | vec[1] = sts; vec[2] = stv; |
748a9306 |
136 | _ckvmssts(sys$putmsg(vec,copy_errmsg,0,0)); |
a0d0e21e |
137 | } |
138 | |
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139 | static unsigned int |
140 | findsym_handler(void *sig, void *mech) |
141 | { |
5c84aa53 |
142 | dTHX; |
2708a6a3 |
143 | unsigned long int myvec[8],args, *usig = (unsigned long int *) sig; |
144 | /* Be paranoid and assume signal vector passed in might be readonly */ |
145 | myvec[0] = args = usig[0] > 10 ? 9 : usig[0] - 1; |
146 | while (--args) myvec[args] = usig[args]; |
147 | _ckvmssts(sys$putmsg(myvec,copy_errmsg,0,0)); |
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148 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "findsym_handler: received\n\t%s\n",dl_last_error)); |
2708a6a3 |
149 | return SS$_CONTINUE; |
150 | } |
151 | |
152 | /* wrapper for lib$find_image_symbol, so signalled errors can be saved |
153 | * for dl_error and then returned */ |
154 | static unsigned long int |
155 | my_find_image_symbol(struct dsc$descriptor_s *imgname, |
156 | struct dsc$descriptor_s *symname, |
157 | void (**entry)(), |
158 | struct dsc$descriptor_s *defspec) |
159 | { |
160 | unsigned long int retsts; |
161 | VAXC$ESTABLISH(findsym_handler); |
b6837a3b |
162 | retsts = lib$find_image_symbol(imgname,symname,entry,defspec,DL_CASE_SENSITIVE); |
2708a6a3 |
163 | return retsts; |
164 | } |
165 | |
166 | |
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167 | static void |
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168 | dl_private_init(pTHX) |
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169 | { |
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170 | dl_generic_private_init(aTHX); |
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171 | { |
172 | dMY_CXT; |
173 | dl_require_symbols = get_av("DynaLoader::dl_require_symbols", 0x4); |
174 | /* Set up the static control blocks for dl_expand_filespec() */ |
175 | dl_fab = cc$rms_fab; |
176 | dl_nam = cc$rms_nam; |
177 | dl_fab.fab$l_nam = &dl_nam; |
178 | dl_nam.nam$l_esa = dl_esa; |
179 | dl_nam.nam$b_ess = sizeof dl_esa; |
180 | dl_nam.nam$l_rsa = dl_rsa; |
181 | dl_nam.nam$b_rss = sizeof dl_rsa; |
182 | } |
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183 | } |
184 | MODULE = DynaLoader PACKAGE = DynaLoader |
185 | |
186 | BOOT: |
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187 | (void)dl_private_init(aTHX); |
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188 | |
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189 | void |
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190 | dl_expandspec(filespec) |
191 | char * filespec |
192 | CODE: |
193 | char vmsspec[NAM$C_MAXRSS], defspec[NAM$C_MAXRSS]; |
194 | size_t deflen; |
195 | vmssts sts; |
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196 | dMY_CXT; |
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197 | |
198 | tovmsspec(filespec,vmsspec); |
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199 | dl_fab.fab$l_fna = vmsspec; |
200 | dl_fab.fab$b_fns = strlen(vmsspec); |
201 | dl_fab.fab$l_dna = 0; |
202 | dl_fab.fab$b_dns = 0; |
146174a9 |
203 | DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_expand_filespec(%s):\n",vmsspec)); |
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204 | /* On the first pass, just parse the specification string */ |
cdc73a10 |
205 | dl_nam.nam$b_nop = NAM$M_SYNCHK; |
206 | sts = sys$parse(&dl_fab); |
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207 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tSYNCHK sys$parse = %d\n",sts)); |
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208 | if (!(sts & 1)) { |
cdc73a10 |
209 | dl_set_error(dl_fab.fab$l_sts,dl_fab.fab$l_stv); |
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210 | ST(0) = &PL_sv_undef; |
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211 | } |
212 | else { |
213 | /* Now set up a default spec - everything but the name */ |
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214 | deflen = dl_nam.nam$l_name - dl_esa; |
215 | memcpy(defspec,dl_esa,deflen); |
216 | memcpy(defspec+deflen,dl_nam.nam$l_type, |
217 | dl_nam.nam$b_type + dl_nam.nam$b_ver); |
218 | deflen += dl_nam.nam$b_type + dl_nam.nam$b_ver; |
219 | memcpy(vmsspec,dl_nam.nam$l_name,dl_nam.nam$b_name); |
146174a9 |
220 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tsplit filespec: name = %.*s, default = %.*s\n", |
cdc73a10 |
221 | dl_nam.nam$b_name,vmsspec,deflen,defspec)); |
a0d0e21e |
222 | /* . . . and go back to expand it */ |
cdc73a10 |
223 | dl_nam.nam$b_nop = 0; |
224 | dl_fab.fab$l_dna = defspec; |
225 | dl_fab.fab$b_dns = deflen; |
226 | dl_fab.fab$b_fns = dl_nam.nam$b_name; |
227 | sts = sys$parse(&dl_fab); |
146174a9 |
228 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tname/default sys$parse = %d\n",sts)); |
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229 | if (!(sts & 1)) { |
cdc73a10 |
230 | dl_set_error(dl_fab.fab$l_sts,dl_fab.fab$l_stv); |
6b88bc9c |
231 | ST(0) = &PL_sv_undef; |
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232 | } |
233 | else { |
234 | /* Now find the actual file */ |
cdc73a10 |
235 | sts = sys$search(&dl_fab); |
146174a9 |
236 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tsys$search = %d\n",sts)); |
2708a6a3 |
237 | if (!(sts & 1)) { |
cdc73a10 |
238 | dl_set_error(dl_fab.fab$l_sts,dl_fab.fab$l_stv); |
6b88bc9c |
239 | ST(0) = &PL_sv_undef; |
a0d0e21e |
240 | } |
241 | else { |
cdc73a10 |
242 | ST(0) = sv_2mortal(newSVpvn(dl_nam.nam$l_rsa,dl_nam.nam$b_rsl)); |
146174a9 |
243 | DLDEBUG(1,PerlIO_printf(Perl_debug_log, "\tresult = \\%.*s\\\n", |
cdc73a10 |
244 | dl_nam.nam$b_rsl,dl_nam.nam$l_rsa)); |
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245 | } |
246 | } |
247 | } |
248 | |
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249 | void |
f86702cc |
250 | dl_load_file(filespec, flags) |
251 | char * filespec |
ff7f3c60 |
252 | int flags |
253 | PREINIT: |
626727d5 |
254 | dTHX; |
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255 | dMY_CXT; |
a0d0e21e |
256 | char vmsspec[NAM$C_MAXRSS]; |
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257 | SV *reqSV, **reqSVhndl; |
258 | STRLEN deflen; |
259 | struct dsc$descriptor_s |
260 | specdsc = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0}, |
261 | symdsc = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0}; |
262 | struct fscnlst { |
263 | unsigned short int len; |
264 | unsigned short int code; |
265 | char *string; |
748a9306 |
266 | } namlst[2] = {{0,FSCN$_NAME,0},{0,0,0}}; |
a0d0e21e |
267 | struct libref *dlptr; |
268 | vmssts sts, failed = 0; |
2708a6a3 |
269 | void (*entry)(); |
ff7f3c60 |
270 | CODE: |
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271 | |
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272 | DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_load_file(%s,%x):\n", filespec,flags)); |
a0d0e21e |
273 | specdsc.dsc$a_pointer = tovmsspec(filespec,vmsspec); |
274 | specdsc.dsc$w_length = strlen(specdsc.dsc$a_pointer); |
146174a9 |
275 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tVMS-ified filespec is %s\n", |
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276 | specdsc.dsc$a_pointer)); |
fc36a67e |
277 | New(1399,dlptr,1,struct libref); |
a0d0e21e |
278 | dlptr->name.dsc$b_dtype = dlptr->defspec.dsc$b_dtype = DSC$K_DTYPE_T; |
279 | dlptr->name.dsc$b_class = dlptr->defspec.dsc$b_class = DSC$K_CLASS_S; |
280 | sts = sys$filescan(&specdsc,namlst,0); |
146174a9 |
281 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tsys$filescan: returns %d, name is %.*s\n", |
a0d0e21e |
282 | sts,namlst[0].len,namlst[0].string)); |
283 | if (!(sts & 1)) { |
284 | failed = 1; |
285 | dl_set_error(sts,0); |
286 | } |
287 | else { |
288 | dlptr->name.dsc$w_length = namlst[0].len; |
289 | dlptr->name.dsc$a_pointer = savepvn(namlst[0].string,namlst[0].len); |
290 | dlptr->defspec.dsc$w_length = specdsc.dsc$w_length - namlst[0].len; |
8c52afec |
291 | New(1097, dlptr->defspec.dsc$a_pointer, dlptr->defspec.dsc$w_length + 1, char); |
a0d0e21e |
292 | deflen = namlst[0].string - specdsc.dsc$a_pointer; |
293 | memcpy(dlptr->defspec.dsc$a_pointer,specdsc.dsc$a_pointer,deflen); |
294 | memcpy(dlptr->defspec.dsc$a_pointer + deflen, |
295 | namlst[0].string + namlst[0].len, |
296 | dlptr->defspec.dsc$w_length - deflen); |
146174a9 |
297 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tlibref = name: %s, defspec: %.*s\n", |
a0d0e21e |
298 | dlptr->name.dsc$a_pointer, |
299 | dlptr->defspec.dsc$w_length, |
300 | dlptr->defspec.dsc$a_pointer)); |
8e07c86e |
301 | if (!(reqSVhndl = av_fetch(dl_require_symbols,0,FALSE)) || !(reqSV = *reqSVhndl)) { |
146174a9 |
302 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\t@dl_require_symbols empty, returning untested libref\n")); |
a0d0e21e |
303 | } |
304 | else { |
305 | symdsc.dsc$w_length = SvCUR(reqSV); |
306 | symdsc.dsc$a_pointer = SvPVX(reqSV); |
146174a9 |
307 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\t$dl_require_symbols[0] = %.*s\n", |
a0d0e21e |
308 | symdsc.dsc$w_length, symdsc.dsc$a_pointer)); |
2708a6a3 |
309 | sts = my_find_image_symbol(&(dlptr->name),&symdsc, |
a0d0e21e |
310 | &entry,&(dlptr->defspec)); |
146174a9 |
311 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tlib$find_image_symbol returns %d\n",sts)); |
a0d0e21e |
312 | if (!(sts&1)) { |
313 | failed = 1; |
314 | dl_set_error(sts,0); |
315 | } |
316 | } |
317 | } |
318 | |
319 | if (failed) { |
320 | Safefree(dlptr->name.dsc$a_pointer); |
321 | Safefree(dlptr->defspec.dsc$a_pointer); |
322 | Safefree(dlptr); |
6b88bc9c |
323 | ST(0) = &PL_sv_undef; |
a0d0e21e |
324 | } |
325 | else { |
c529f79d |
326 | ST(0) = sv_2mortal(newSViv(PTR2IV(dlptr))); |
a0d0e21e |
327 | } |
328 | |
329 | |
748a9306 |
330 | void |
a0d0e21e |
331 | dl_find_symbol(librefptr,symname) |
332 | void * librefptr |
333 | SV * symname |
334 | CODE: |
335 | struct libref thislib = *((struct libref *)librefptr); |
336 | struct dsc$descriptor_s |
337 | symdsc = {SvCUR(symname),DSC$K_DTYPE_T,DSC$K_CLASS_S,SvPVX(symname)}; |
338 | void (*entry)(); |
339 | vmssts sts; |
340 | |
146174a9 |
341 | DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_find_dymbol(%.*s,%.*s):\n", |
a0d0e21e |
342 | thislib.name.dsc$w_length, thislib.name.dsc$a_pointer, |
343 | symdsc.dsc$w_length,symdsc.dsc$a_pointer)); |
2708a6a3 |
344 | sts = my_find_image_symbol(&(thislib.name),&symdsc, |
345 | &entry,&(thislib.defspec)); |
146174a9 |
346 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tlib$find_image_symbol returns %d\n",sts)); |
347 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "\tentry point is %d\n", |
a0d0e21e |
348 | (unsigned long int) entry)); |
349 | if (!(sts & 1)) { |
2708a6a3 |
350 | /* error message already saved by findsym_handler */ |
6b88bc9c |
351 | ST(0) = &PL_sv_undef; |
a0d0e21e |
352 | } |
c529f79d |
353 | else ST(0) = sv_2mortal(newSViv(PTR2IV(entry))); |
a0d0e21e |
354 | |
355 | |
356 | void |
357 | dl_undef_symbols() |
358 | PPCODE: |
359 | |
360 | |
361 | # These functions should not need changing on any platform: |
362 | |
363 | void |
364 | dl_install_xsub(perl_name, symref, filename="$Package") |
365 | char * perl_name |
366 | void * symref |
367 | char * filename |
368 | CODE: |
146174a9 |
369 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "dl_install_xsub(name=%s, symref=%x)\n", |
a0d0e21e |
370 | perl_name, symref)); |
cea2e8a9 |
371 | ST(0) = sv_2mortal(newRV((SV*)newXS(perl_name, |
372 | (void(*)(pTHX_ CV *))symref, |
373 | filename))); |
a0d0e21e |
374 | |
375 | |
376 | char * |
377 | dl_error() |
378 | CODE: |
cdc73a10 |
379 | dMY_CXT; |
380 | RETVAL = dl_last_error ; |
a0d0e21e |
381 | OUTPUT: |
382 | RETVAL |
383 | |
384 | # end. |