1docs::api::ModPerl::UtiUls(e3r)Contributed Perl Documentdaotciso:n:api::ModPerl::Util(3)
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NAME

6       ModPerl::Util - Helper mod_perl Functions
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Synopsis

9         use ModPerl::Util;
10
11         # e.g. PerlResponseHandler
12         $callback = ModPerl::Util::current_callback;
13
14         # exit w/o killing the interpreter
15         ModPerl::Util::exit();
16
17         # untaint a string (do not use it! see the doc)
18         ModPerl::Util::untaint($string);
19
20         # removes a stash (.so, %INC{$stash}, etc.) as best as it can
21         ModPerl::Util::unload_package($stash);
22
23         # current perl's address (0x92ac760 or 0x0 under non-threaded perl)
24         ModPerl::Util::current_perl_id();
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Description

27       "ModPerl::Util" provides mod_perl utilities API.
28

API

30       "ModPerl::Util" provides the following functions and/or methods:
31
32   "current_callback"
33       Returns the currently running callback name, e.g.
34       'PerlResponseHandler'.
35
36         $callback = ModPerl::Util::current_callback();
37
38       ret: $callback ( string )
39       since: 2.0.00
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41   "current_perl_id"
42       Return the memory address of the perl interpreter
43
44         $perl_id = ModPerl::Util::current_perl_id();
45
46       ret: $perl_id ( string )
47           Under threaded perl returns something like: 0x92ac760
48
49           Under non-thread perl returns 0x0
50
51       since: 2.0.00
52
53       Mainly useful for debugging applications running under threaded-perl.
54
55   "exit"
56       Terminate the request, but not the current process (or not the current
57       Perl interpreter with threaded mpms).
58
59         ModPerl::Util::exit($status);
60
61       opt arg1: $status ( integer )
62           The exit status, which as of this writing is ignored. (it's
63           accepted to be compatible with the core "exit" function.)
64
65       ret: no return value
66       since: 2.0.00
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68       Normally you will use the plain "exit()" in your code. You don't need
69       to use "ModPerl::Util::exit" explicitly, since mod_perl overrides
70       "exit()" by setting "CORE::GLOBAL::exit" to "ModPerl::Util::exit". Only
71       if you redefine "CORE::GLOBAL::exit" once mod_perl is running, you may
72       want to use this function.
73
74       The original "exit()" is still available via "CORE::exit()".
75
76       "ModPerl::Util::exit" is implemented as a special "die()" call,
77       therefore if you call it inside "eval BLOCK" or "eval "STRING"", while
78       an exception is being thrown, it is caught by "eval". For example:
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80         exit;
81         print "Still running";
82
83       will not print anything. But:
84
85         eval {
86            exit;
87         }
88         print "Still running";
89
90       will print Still running. So you either need to check whether the
91       exception is specific to "exit" and call "exit()" again:
92
93         use ModPerl::Const -compile => 'EXIT';
94         eval {
95            exit;
96         }
97         exit if $@ && ref $@ eq 'APR::Error' && $@ == ModPerl::EXIT;
98         print "Still running";
99
100       or use "CORE::exit()":
101
102         eval {
103            CORE::exit;
104         }
105         print "Still running";
106
107       and nothing will be printed. The problem with the latter is the current
108       process (or a Perl Interpreter) will be killed; something that you
109       really want to avoid under mod_perl.
110
111   "unload_package"
112       Unloads a stash from the current Perl interpreter in the safest way
113       possible.
114
115         ModPerl::Util::unload_package($stash);
116
117       arg1: $stash ( string )
118           The Perl stash to unload. e.g. "MyApache2::MyData".
119
120       ret: no return value
121       since: 2.0.00
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123       Unloading a Perl stash (package) is a complicated business. This
124       function tries very hard to do the right thing. After calling this
125       function, it should be safe to "use()" a new version of the module that
126       loads the wiped package.
127
128       References to stash elements (functions, variables, etc.) taken from
129       outside the unloaded package will still be valid.
130
131       This function may wipe off things loaded by other modules, if the
132       latter have inserted things into the $stash it was told to unload.
133
134       If a stash had a corresponding XS shared object (.so) loaded it will be
135       unloaded as well.
136
137       If the stash had a corresponding entry in %INC, it will be removed from
138       there.
139
140       "unload_package()" takes care to leave sub-stashes intact while
141       deleting the requested stash. So for example if "CGI" and "CGI::Carp"
142       are loaded, calling "unload_package('CGI')" won't affect "CGI::Carp".
143
144   "untaint"
145       Untaint the variable, by turning its tainted SV flag off (used
146       internally).
147
148         ModPerl::Util::untaint($tainted_var);
149
150       arg1: $tainted_var (scalar)
151       ret: no return value
152           $tainted_var is untainted.
153
154       since: 2.0.00
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156       Do not use this function unless you know what you are doing. To learn
157       how to properly untaint variables refer to the perlsec manpage.
158

See Also

160       mod_perl 2.0 documentation.
161

163       mod_perl 2.0 and its core modules are copyrighted under The Apache
164       Software License, Version 2.0.
165

Authors

167       The mod_perl development team and numerous contributors.
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171perl v5.34.0                      2021-07-22       docs::api::ModPerl::Util(3)
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