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[perl5.git] / ext / DynaLoader / dlutils.c
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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 *
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6 * Modified:
7 * 29th Feburary 2000 - Alan Burlison: Added functionality to close dlopen'd
8 * files when the interpreter exits
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9 */
10
11
12/* pointer to allocated memory for last error message */
13static char *LastError = (char*)NULL;
14
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15/* flag for immediate rather than lazy linking (spots unresolved symbol) */
16static int dl_nonlazy = 0;
17
18#ifdef DL_LOADONCEONLY
19static HV *dl_loaded_files = Nullhv; /* only needed on a few systems */
20#endif
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21
22
23#ifdef DEBUGGING
1001cf6c 24static int dl_debug = 0; /* value copied from $DynaLoader::dl_debug */
8e07c86e 25#define DLDEBUG(level,code) if (dl_debug>=level) { code; }
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26#else
27#define DLDEBUG(level,code)
28#endif
29
c6c619a9 30#ifdef DL_UNLOAD_ALL_AT_EXIT
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31/* Close all dlopen'd files */
32static void
33dl_unload_all_files(pTHXo_ void *unused)
34{
35 CV *sub;
36 AV *dl_librefs;
37 SV *dl_libref;
38
39 if ((sub = get_cv("DynaLoader::dl_unload_file", FALSE)) != NULL) {
40 dl_librefs = get_av("DynaLoader::dl_librefs", FALSE);
41 while ((dl_libref = av_pop(dl_librefs)) != &PL_sv_undef) {
42 dSP;
43 ENTER;
44 SAVETMPS;
45 PUSHMARK(SP);
46 XPUSHs(sv_2mortal(dl_libref));
47 PUTBACK;
22851543 48 call_sv((SV*)sub, G_DISCARD | G_NODEBUG);
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49 FREETMPS;
50 LEAVE;
51 }
52 }
53}
c6c619a9 54#endif
abb9e9dc 55
a0d0e21e 56static void
0cb96387 57dl_generic_private_init(pTHXo) /* called by dl_*.xs dl_private_init() */
a0d0e21e 58{
8e07c86e 59 char *perl_dl_nonlazy;
a0d0e21e 60#ifdef DEBUGGING
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61 SV *sv = get_sv("DynaLoader::dl_debug", 0);
62 dl_debug = sv ? SvIV(sv) : 0;
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63#endif
64 if ( (perl_dl_nonlazy = getenv("PERL_DL_NONLAZY")) != NULL )
65 dl_nonlazy = atoi(perl_dl_nonlazy);
66 if (dl_nonlazy)
bf49b057 67 DLDEBUG(1,PerlIO_printf(Perl_debug_log, "DynaLoader bind mode is 'non-lazy'\n"));
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68#ifdef DL_LOADONCEONLY
69 if (!dl_loaded_files)
70 dl_loaded_files = newHV(); /* provide cache for dl_*.xs if needed */
a0d0e21e 71#endif
23d2500b 72#ifdef DL_UNLOAD_ALL_AT_EXIT
abb9e9dc 73 call_atexit(&dl_unload_all_files, (void*)0);
23d2500b 74#endif
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75}
76
77
78/* SaveError() takes printf style args and saves the result in LastError */
a0d0e21e 79static void
0cb96387 80SaveError(pTHXo_ char* pat, ...)
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81{
82 va_list args;
a6c40364 83 SV *msv;
a0d0e21e 84 char *message;
a6c40364 85 STRLEN len;
a0d0e21e 86
8e07c86e 87 /* This code is based on croak/warn, see mess() in util.c */
a0d0e21e 88
a0d0e21e 89 va_start(args, pat);
5a844595 90 msv = vmess(pat, &args);
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91 va_end(args);
92
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93 message = SvPV(msv,len);
94 len++; /* include terminating null char */
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95
96 /* Allocate some memory for the error message */
97 if (LastError)
98 LastError = (char*)saferealloc(LastError, len) ;
99 else
2e5d53bf 100 LastError = (char *) safemalloc(len) ;
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101
102 /* Copy message into LastError (including terminating null char) */
103 strncpy(LastError, message, len) ;
bf49b057 104 DLDEBUG(2,PerlIO_printf(Perl_debug_log, "DynaLoader: stored error msg '%s'\n",LastError));
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105}
106