1Test2::Harness::IPC(3)User Contributed Perl DocumentationTest2::Harness::IPC(3)
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NAME

6       Test2::Harness::IPC - Base class for modules that control child
7       processes.
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DESCRIPTION

10       This module is the base class for all parts of Test2::Harness that have
11       to do process management.
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ATTRIBUTES

14       $pid = $ipc->pid
15           The root PID of the IPC object.
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17       $hashref = $ipc->handlers
18           Custom signal handlers specific to the IPC object.
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20       $hashref = $ipc->procs
21           Hashref of "$pid => $proc" where $proc is an instance of
22           Test2::Harness::IPC::Proc.
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24       $hashref = $ipc->procs_by_cat
25           Hashref of "$category => { $pid => $proc }".
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27       $hashref = $ipc->waiting
28           Hashref of processes that have finished, but have not been handled
29           yet.
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31           This is an implementation detail you should not rely on.
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33       $float = $ipc->wait_time
34           How long to sleep between loops when in a wait cycle.
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36       $bool = $ipc->started
37           True if the IPC process has started.
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39       $ipc->sig_count
40           Implementation detail, used to break wait loops when signals are
41           received.
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METHODS

44       $ipc->start
45           Start the IPC management (Insert signal handlers).
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47       $ipc->stop
48           Stop the IPC management (Remove signal handlers).
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50       $ipc->set_sig_handler($sig, sub { ... })
51           Set a custom signal handler. This is a safer version of "local
52           %SIG{$sig}" for use with IPC.
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54           The callback will get exactly one argument, the name of the signal
55           that was recieved.
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57       $ipc->handle_sig($sig)
58           Handle the specified signal. Will cause process exit if the signal
59           has no handler.
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61       $ipc->killall()
62       $ipc->killall($sig)
63           Kill all tracked child process with the given signal. "TERM" is
64           used if no signal is specified.
65
66           This will not wait on the processes, you must call "$ipc->wait()".
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68       $ipc->check_timeouts
69           This is a no-op on the IPC base class. This is called every loop of
70           "$ipc->wait". If you subclass the IPC class you can fill this in to
71           make processes timeout if needed.
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73       $ipc->check_for_fork
74           This is used a lot internally to check if this is a forked process.
75           If this is a forked process the IPC object is completely reset with
76           no remaining internal state (except signal handlers).
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78       $ipc->set_proc_exit($proc, @args)
79           Calls "$proc->set_exit(@args)". This is called by "$ipc->wait". You
80           can override it to add custom tasks when a process exits.
81
82       $int = $ipc->wait()
83       $int = $ipc->wait(%params)
84           Wait on processes, return the number found.
85
86           Default is non-blocking.
87
88           Options:
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90           timeout => $float
91               If a blocking paremeter is provided this can be used to break
92               the wait after a timeout. Time::HiRes is used, so timeout is in
93               seconds with decimals.
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95           all => $bool
96               Block until ALL processes are done.
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98           cat => $category
99               Block until at least 1 process from the category is complete.
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101           all_cat => $category
102               Block until ALL processes from the category are complete.
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104           block => $bool
105               Block until at least 1 process is complete.
106
107       $ipc->watch($proc)
108           Add a process to be monitored.
109
110       $proc = $ipc->spawn($proc)
111       $proc = $ipc->spawn(%params)
112           In the first form $proc is an instance of Test2::Harness::IPC::Proc
113           that provides "spawn_params()".
114
115           In the second form the following params are allowed:
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117           Anything supported by "run_cmd()" in Test2::Harness::Util::IPC.
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119           process_class => $CLASS
120               Default is Test2::Harness::IPC::Process.
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122           command => $command
123               Program command to call. This is required.
124
125           env_vars => { ... }
126               Specify custom environment variables for the new process.
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SOURCE

129       The source code repository for Test2-Harness can be found at
130       http://github.com/Test-More/Test2-Harness/.
131

MAINTAINERS

133       Chad Granum <exodist@cpan.org>
134

AUTHORS

136       Chad Granum <exodist@cpan.org>
137

139       Copyright 2020 Chad Granum <exodist7@gmail.com>.
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141       This program is free software; you can redistribute it and/or modify it
142       under the same terms as Perl itself.
143
144       See http://dev.perl.org/licenses/
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148perl v5.32.0                      2020-07-28            Test2::Harness::IPC(3)
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