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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 | |
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11 | #define MY_CXT_KEY "DynaLoader_guts" |
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12 | |
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13 | typedef struct { |
14 | char * x_dl_last_error; /* pointer to allocated memory for |
15 | last error message */ |
16 | int x_dl_nonlazy; /* flag for immediate rather than lazy |
17 | linking (spots unresolved symbol) */ |
18 | #ifdef DL_LOADONCEONLY |
19 | HV * x_dl_loaded_files; /* only needed on a few systems */ |
20 | #endif |
21 | #ifdef DL_CXT_EXTRA |
22 | my_cxtx_t x_dl_cxtx; /* extra platform-specific data */ |
23 | #endif |
24 | #ifdef DEBUGGING |
25 | int x_dl_debug; /* value copied from $DynaLoader::dl_debug */ |
26 | #endif |
27 | } my_cxt_t; |
28 | |
29 | /* XXX most of this is boilerplate code that should abstracted further into |
30 | * macros and exposed via XSUB.h */ |
31 | |
32 | #if defined(USE_ITHREADS) |
33 | |
34 | #define dMY_CXT_SV \ |
35 | SV *my_cxt_sv = *hv_fetch(PL_modglobal, MY_CXT_KEY, \ |
36 | sizeof(MY_CXT_KEY)-1, TRUE) |
37 | |
38 | /* we allocate my_cxt in a Perl SV so that it will be released when |
39 | * the interpreter goes away */ |
40 | #define dMY_CXT_INIT \ |
41 | dMY_CXT_SV; \ |
42 | /* newSV() allocates one more than needed */ \ |
43 | my_cxt_t *my_cxt = (my_cxt_t*)SvPVX(newSV(sizeof(my_cxt_t)-1)); \ |
44 | Zero(my_cxt, 1, my_cxt_t); \ |
45 | sv_setuv(my_cxt_sv, (UV)my_cxt); |
46 | |
47 | #define dMY_CXT \ |
48 | dMY_CXT_SV; \ |
49 | my_cxt_t *my_cxt = (my_cxt_t*)SvUV(my_cxt_sv) |
50 | |
51 | #define dl_last_error (my_cxt->x_dl_last_error) |
52 | #define dl_nonlazy (my_cxt->x_dl_nonlazy) |
53 | #ifdef DL_LOADONCEONLY |
54 | #define dl_loaded_files (my_cxt->x_dl_loaded_files) |
55 | #endif |
56 | #ifdef DL_CXT_EXTRA |
57 | #define dl_cxtx (my_cxt->x_dl_cxtx) |
58 | #endif |
59 | #ifdef DEBUGGING |
60 | #define dl_debug (my_cxt->x_dl_debug) |
61 | #endif |
62 | |
63 | #else /* USE_ITHREADS */ |
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64 | |
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65 | static my_cxt_t my_cxt; |
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66 | |
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67 | #define dMY_CXT_SV dNOOP |
68 | #define dMY_CXT_INIT dNOOP |
69 | #define dMY_CXT dNOOP |
70 | |
71 | #define dl_last_error (my_cxt.x_dl_last_error) |
72 | #define dl_nonlazy (my_cxt.x_dl_nonlazy) |
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73 | #ifdef DL_LOADONCEONLY |
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74 | #define dl_loaded_files (my_cxt.x_dl_loaded_files) |
75 | #endif |
76 | #ifdef DL_CXT_EXTRA |
77 | #define dl_cxtx (my_cxt.x_dl_cxtx) |
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78 | #endif |
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79 | #ifdef DEBUGGING |
80 | #define dl_debug (my_cxt.x_dl_debug) |
81 | #endif |
82 | |
83 | #endif /* !defined(USE_ITHREADS) */ |
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84 | |
85 | |
86 | #ifdef DEBUGGING |
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87 | #define DLDEBUG(level,code) \ |
88 | STMT_START { \ |
89 | dMY_CXT; \ |
90 | if (dl_debug>=level) { code; } \ |
91 | } STMT_END |
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92 | #else |
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93 | #define DLDEBUG(level,code) NOOP |
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94 | #endif |
95 | |
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96 | #ifdef DL_UNLOAD_ALL_AT_EXIT |
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97 | /* Close all dlopen'd files */ |
98 | static void |
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99 | dl_unload_all_files(pTHX_ void *unused) |
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100 | { |
101 | CV *sub; |
102 | AV *dl_librefs; |
103 | SV *dl_libref; |
104 | |
105 | if ((sub = get_cv("DynaLoader::dl_unload_file", FALSE)) != NULL) { |
106 | dl_librefs = get_av("DynaLoader::dl_librefs", FALSE); |
107 | while ((dl_libref = av_pop(dl_librefs)) != &PL_sv_undef) { |
108 | dSP; |
109 | ENTER; |
110 | SAVETMPS; |
111 | PUSHMARK(SP); |
112 | XPUSHs(sv_2mortal(dl_libref)); |
113 | PUTBACK; |
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114 | call_sv((SV*)sub, G_DISCARD | G_NODEBUG); |
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115 | FREETMPS; |
116 | LEAVE; |
117 | } |
118 | } |
119 | } |
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120 | #endif |
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121 | |
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122 | static void |
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123 | dl_generic_private_init(pTHX) /* called by dl_*.xs dl_private_init() */ |
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124 | { |
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125 | char *perl_dl_nonlazy; |
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126 | dMY_CXT_INIT; |
127 | |
128 | dl_last_error = NULL; |
129 | dl_nonlazy = 0; |
130 | #ifdef DL_LOADONCEONLY |
131 | dl_loaded_files = Nullhv; |
132 | #endif |
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133 | #ifdef DEBUGGING |
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134 | { |
135 | SV *sv = get_sv("DynaLoader::dl_debug", 0); |
136 | dl_debug = sv ? SvIV(sv) : 0; |
137 | } |
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138 | #endif |
139 | if ( (perl_dl_nonlazy = getenv("PERL_DL_NONLAZY")) != NULL ) |
140 | dl_nonlazy = atoi(perl_dl_nonlazy); |
141 | if (dl_nonlazy) |
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142 | DLDEBUG(1,PerlIO_printf(Perl_debug_log, "DynaLoader bind mode is 'non-lazy'\n")); |
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143 | #ifdef DL_LOADONCEONLY |
144 | if (!dl_loaded_files) |
145 | dl_loaded_files = newHV(); /* provide cache for dl_*.xs if needed */ |
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146 | #endif |
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147 | #ifdef DL_UNLOAD_ALL_AT_EXIT |
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148 | call_atexit(&dl_unload_all_files, (void*)0); |
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149 | #endif |
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150 | } |
151 | |
152 | |
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153 | /* SaveError() takes printf style args and saves the result in dl_last_error */ |
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154 | static void |
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155 | SaveError(pTHX_ char* pat, ...) |
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156 | { |
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157 | dMY_CXT; |
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158 | va_list args; |
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159 | SV *msv; |
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160 | char *message; |
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161 | STRLEN len; |
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162 | |
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163 | /* This code is based on croak/warn, see mess() in util.c */ |
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164 | |
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165 | va_start(args, pat); |
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166 | msv = vmess(pat, &args); |
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167 | va_end(args); |
168 | |
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169 | message = SvPV(msv,len); |
170 | len++; /* include terminating null char */ |
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171 | |
172 | /* Allocate some memory for the error message */ |
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173 | if (dl_last_error) |
174 | dl_last_error = (char*)saferealloc(dl_last_error, len); |
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175 | else |
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176 | dl_last_error = (char*)safemalloc(len); |
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177 | |
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178 | /* Copy message into dl_last_error (including terminating null char) */ |
179 | strncpy(dl_last_error, message, len) ; |
180 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "DynaLoader: stored error msg '%s'\n",dl_last_error)); |
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181 | } |
182 | |