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1 | /* dynl-dl.c - dynamic linking for dlopen/dlsym |
2 | * | |
3 | * Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2, or (at your option) | |
8 | * any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this software; see the file COPYING. If not, write to | |
17 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | * | |
19 | * As a special exception, the Free Software Foundation gives permission | |
20 | * for additional uses of the text contained in its release of GUILE. | |
21 | * | |
22 | * The exception is that, if you link the GUILE library with other files | |
23 | * to produce an executable, this does not by itself cause the | |
24 | * resulting executable to be covered by the GNU General Public License. | |
25 | * Your use of that executable is in no way restricted on account of | |
26 | * linking the GUILE library code into it. | |
27 | * | |
28 | * This exception does not however invalidate any other reasons why | |
29 | * the executable file might be covered by the GNU General Public License. | |
30 | * | |
31 | * This exception applies only to the code released by the | |
32 | * Free Software Foundation under the name GUILE. If you copy | |
33 | * code from other Free Software Foundation releases into a copy of | |
34 | * GUILE, as the General Public License permits, the exception does | |
35 | * not apply to the code that you add in this way. To avoid misleading | |
36 | * anyone as to the status of such modified files, you must delete | |
37 | * this exception notice from them. | |
38 | * | |
39 | * If you write modifications of your own for GUILE, it is your choice | |
40 | * whether to permit this exception to apply to your modifications. | |
41 | * If you do not wish that, delete this exception notice. | |
42 | */ | |
43 | ||
44 | /* "dynl.c" dynamically link&load object files. | |
45 | Author: Aubrey Jaffer | |
46 | Modified for libguile by Marius Vollmer */ | |
47 | ||
48 | #include "_scm.h" | |
49 | #include "genio.h" | |
50 | #include "smob.h" | |
51 | ||
52 | #include <dlfcn.h> | |
53 | ||
54 | #define SHL(obj) ((void*)SCM_CDR(obj)) | |
55 | ||
56 | #ifdef RTLD_LAZY /* Solaris 2. */ | |
57 | # define DLOPEN_MODE RTLD_LAZY | |
58 | #else | |
59 | # define DLOPEN_MODE 1 /* Thats what it says in the man page. */ | |
60 | #endif | |
61 | ||
62 | static scm_sizet frshl SCM_P ((SCM ptr)); | |
63 | ||
64 | static scm_sizet | |
65 | frshl (ptr) | |
66 | SCM ptr; | |
67 | { | |
68 | #if 0 | |
69 | /* Should freeing a shl close and possibly unmap the object file it */ | |
70 | /* refers to? */ | |
71 | if (SHL(ptr)) | |
72 | dlclose (SHL(ptr)); | |
73 | #endif | |
74 | return 0; | |
75 | } | |
76 | ||
77 | static int prinshl SCM_P ((SCM exp, SCM port, scm_print_state *pstate)); | |
78 | ||
79 | static int | |
80 | prinshl (exp, port, pstate) | |
81 | SCM exp; | |
82 | SCM port; | |
83 | scm_print_state *pstate; | |
84 | { | |
85 | scm_gen_puts (scm_regular_string, "#<dynamic-linked ", port); | |
86 | scm_intprint (SCM_CDR (exp), 16, port); | |
87 | scm_gen_putc ('>', port); | |
88 | return 1; | |
89 | } | |
90 | ||
91 | int scm_tc16_shl; | |
92 | static scm_smobfuns shlsmob = { scm_mark0, frshl, prinshl }; | |
93 | ||
94 | SCM_PROC (s_dynamic_link, "dynamic-link", 1, 0, 0, scm_dynamic_link); | |
95 | ||
96 | SCM | |
97 | scm_dynamic_link (fname) | |
98 | SCM fname; | |
99 | { | |
100 | SCM z; | |
101 | void *handle; | |
102 | ||
103 | /* if FALSEP(fname) return fname; XXX - ? */ | |
104 | ||
105 | fname = scm_coerce_rostring (fname, s_dynamic_link, SCM_ARG1); | |
106 | ||
107 | SCM_DEFER_INTS; | |
108 | handle = dlopen (SCM_CHARS (fname), DLOPEN_MODE); | |
109 | if (NULL == handle) | |
110 | scm_misc_error (s_dynamic_link, (char *)dlerror (), SCM_EOL); | |
111 | SCM_NEWCELL (z); | |
112 | SCM_SETCHARS (z, handle); | |
113 | SCM_SETCAR (z, scm_tc16_shl); | |
114 | SCM_ALLOW_INTS; | |
115 | ||
116 | return z; | |
117 | } | |
118 | ||
119 | static void *get_func SCM_P ((void *handle, char *func, char *subr)); | |
120 | ||
121 | static void * | |
122 | get_func (handle, func, subr) | |
123 | void *handle; | |
124 | char *func; | |
125 | char *subr; | |
126 | { | |
127 | void *fptr; | |
128 | char *err; | |
129 | ||
130 | fptr = dlsym (handle, func); | |
131 | err = (char *)dlerror (); | |
132 | if (!fptr) | |
133 | scm_misc_error (subr, err? err : "symbol has NULL address", SCM_EOL); | |
134 | return fptr; | |
135 | } | |
136 | ||
137 | SCM_PROC (s_dynamic_call, "dynamic-call", 2, 0, 0, scm_dynamic_call); | |
138 | ||
139 | SCM | |
140 | scm_dynamic_call (symb, shl) | |
141 | SCM symb, shl; | |
142 | { | |
143 | void (*func) SCM_P ((void)) = 0; | |
144 | ||
145 | symb = scm_coerce_rostring (symb, s_dynamic_call, SCM_ARG1); | |
146 | SCM_ASSERT (SCM_NIMP (shl) && SCM_CAR (shl) == scm_tc16_shl, shl, | |
147 | SCM_ARG2, s_dynamic_call); | |
148 | ||
149 | SCM_DEFER_INTS; | |
150 | func = get_func (SHL(shl), SCM_CHARS (symb), s_dynamic_call); | |
151 | SCM_ALLOW_INTS; | |
152 | ||
153 | (*func) (); | |
154 | ||
155 | return SCM_BOOL_T; | |
156 | } | |
157 | ||
158 | SCM_PROC (s_dynamic_args_call, "dynamic-args-call", 3, 0, 0, scm_dynamic_args_call); | |
159 | ||
160 | SCM | |
161 | scm_dynamic_args_call (symb, shl, args) | |
162 | SCM symb, shl, args; | |
163 | { | |
164 | int i, argc; | |
165 | char **argv; | |
166 | int (*func) SCM_P ((int argc, char **argv)) = 0; | |
167 | ||
168 | symb = scm_coerce_rostring (symb, s_dynamic_args_call, SCM_ARG1); | |
169 | SCM_ASSERT (SCM_NIMP (shl) && SCM_CAR (shl) == scm_tc16_shl, shl, | |
170 | SCM_ARG2, s_dynamic_args_call); | |
171 | ||
172 | SCM_DEFER_INTS; | |
173 | func = get_func (SHL(shl), SCM_CHARS (symb), s_dynamic_args_call); | |
174 | argv = scm_make_argv_from_stringlist (args, &argc, s_dynamic_args_call, | |
175 | SCM_ARG3); | |
176 | SCM_ALLOW_INTS; | |
177 | ||
178 | i = (*func) (argc, argv); | |
179 | ||
180 | SCM_DEFER_INTS; | |
181 | scm_must_free_argv(argv); | |
182 | SCM_ALLOW_INTS; | |
183 | return SCM_MAKINUM(0L+i); | |
184 | } | |
185 | ||
186 | SCM_PROC (s_dynamic_unlink, "dynamic-unlink", 1, 0, 0, scm_dynamic_unlink); | |
187 | ||
188 | SCM | |
189 | scm_dynamic_unlink (shl) | |
190 | SCM shl; | |
191 | { | |
192 | int status; | |
193 | ||
194 | SCM_ASSERT (SCM_NIMP (shl) && SCM_CAR (shl) == scm_tc16_shl, shl, | |
195 | SCM_ARG1, s_dynamic_unlink); | |
196 | ||
197 | SCM_DEFER_INTS; | |
198 | status = dlclose (SHL(shl)); | |
199 | SCM_SETCHARS (shl, NULL); | |
200 | SCM_ALLOW_INTS; | |
201 | ||
202 | if (status) | |
203 | scm_misc_error (s_dynamic_unlink, (char *)dlerror (), SCM_EOL); | |
204 | return SCM_BOOL_T; | |
205 | } | |
206 | ||
207 | void | |
208 | scm_init_dynamic_linking () | |
209 | { | |
210 | scm_tc16_shl = scm_newsmob (&shlsmob); | |
211 | #include "dynl.x" | |
212 | } |