1 /* dlutils.c - handy functions and definitions for dl_*.xs files
2 *
3 * Currently this file is simply #included into dl_*.xs/.c files.
4 * It should really be split into a dlutils.h and dlutils.c
5 *
6 * Modified:
7 * 29th Feburary 2000 - Alan Burlison: Added functionality to close dlopen'd
8 * files when the interpreter exits
9 */
10
11 #ifndef XS_VERSION
12 # define XS_VERSION "0"
13 #endif
14 #define MY_CXT_KEY "DynaLoader::_guts" XS_VERSION
15
16 typedef struct {
17 SV* x_dl_last_error; /* pointer to allocated memory for
18 last error message */
19 int x_dl_nonlazy; /* flag for immediate rather than lazy
20 linking (spots unresolved symbol) */
21 #ifdef DL_LOADONCEONLY
22 HV * x_dl_loaded_files; /* only needed on a few systems */
23 #endif
24 #ifdef DL_CXT_EXTRA
25 my_cxtx_t x_dl_cxtx; /* extra platform-specific data */
26 #endif
27 #ifdef DEBUGGING
28 int x_dl_debug; /* value copied from $DynaLoader::dl_debug */
29 #endif
30 } my_cxt_t;
31
32 START_MY_CXT
33
34 #define dl_last_error (SvPVX(MY_CXT.x_dl_last_error))
35 #define dl_nonlazy (MY_CXT.x_dl_nonlazy)
36 #ifdef DL_LOADONCEONLY
37 #define dl_loaded_files (MY_CXT.x_dl_loaded_files)
38 #endif
39 #ifdef DL_CXT_EXTRA
40 #define dl_cxtx (MY_CXT.x_dl_cxtx)
41 #endif
42 #ifdef DEBUGGING
43 #define dl_debug (MY_CXT.x_dl_debug)
44 #endif
45
46 #ifdef DEBUGGING
47 #define DLDEBUG(level,code) \
48 STMT_START { \
49 dMY_CXT; \
50 if (dl_debug>=level) { code; } \
51 } STMT_END
52 #else
53 #define DLDEBUG(level,code) NOOP
54 #endif
55
56 #ifdef DL_UNLOAD_ALL_AT_EXIT
57 /* Close all dlopen'd files */
58 static void
dl_unload_all_files(pTHX_ void * unused)59 dl_unload_all_files(pTHX_ void *unused)
60 {
61 CV *sub;
62 AV *dl_librefs;
63 SV *dl_libref;
64
65 if ((sub = get_cv("DynaLoader::dl_unload_file", FALSE)) != NULL) {
66 dl_librefs = get_av("DynaLoader::dl_librefs", FALSE);
67 while ((dl_libref = av_pop(dl_librefs)) != &PL_sv_undef) {
68 dSP;
69 ENTER;
70 SAVETMPS;
71 PUSHMARK(SP);
72 XPUSHs(sv_2mortal(dl_libref));
73 PUTBACK;
74 call_sv((SV*)sub, G_DISCARD | G_NODEBUG);
75 FREETMPS;
76 LEAVE;
77 }
78 }
79 }
80 #endif
81
82 static void
dl_generic_private_init(pTHX)83 dl_generic_private_init(pTHX) /* called by dl_*.xs dl_private_init() */
84 {
85 char *perl_dl_nonlazy;
86 MY_CXT_INIT;
87
88 MY_CXT.x_dl_last_error = newSVpvn("", 0);
89 dl_nonlazy = 0;
90 #ifdef DL_LOADONCEONLY
91 dl_loaded_files = Nullhv;
92 #endif
93 #ifdef DEBUGGING
94 {
95 SV *sv = get_sv("DynaLoader::dl_debug", 0);
96 dl_debug = sv ? SvIV(sv) : 0;
97 }
98 #endif
99 if ( (perl_dl_nonlazy = getenv("PERL_DL_NONLAZY")) != NULL )
100 dl_nonlazy = atoi(perl_dl_nonlazy);
101 if (dl_nonlazy)
102 DLDEBUG(1,PerlIO_printf(Perl_debug_log, "DynaLoader bind mode is 'non-lazy'\n"));
103 #ifdef DL_LOADONCEONLY
104 if (!dl_loaded_files)
105 dl_loaded_files = newHV(); /* provide cache for dl_*.xs if needed */
106 #endif
107 #ifdef DL_UNLOAD_ALL_AT_EXIT
108 call_atexit(&dl_unload_all_files, (void*)0);
109 #endif
110 }
111
112
113 /* SaveError() takes printf style args and saves the result in dl_last_error */
114 static void
SaveError(pTHX_ const char * pat,...)115 SaveError(pTHX_ const char* pat, ...)
116 {
117 dMY_CXT;
118 va_list args;
119 SV *msv;
120 const char *message;
121 STRLEN len;
122
123 /* This code is based on croak/warn, see mess() in util.c */
124
125 va_start(args, pat);
126 msv = vmess(pat, &args);
127 va_end(args);
128
129 message = SvPV(msv,len);
130 len++; /* include terminating null char */
131
132 /* Copy message into dl_last_error (including terminating null char) */
133 sv_setpvn(MY_CXT.x_dl_last_error, message, len) ;
134 DLDEBUG(2,PerlIO_printf(Perl_debug_log, "DynaLoader: stored error msg '%s'\n",dl_last_error));
135 }
136
137