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init: propagate exit conditions of children

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This patch extends the configuration concept of init with an additional
sub node for the <start> node:

<start name="noux">
  <exit propagate="yes"/>
  ...
</start>

If the 'propagate' attribute is set to "yes", the exit of the respective
child will appear to init's parent as the exit of the entire init
subsystem.

Fixes #1686
This commit is contained in:
Norman Feske 2015-09-15 18:16:31 +02:00 committed by Christian Helmuth
parent 686f53a5c3
commit 0f052357ef
2 changed files with 38 additions and 0 deletions
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21
repos/os/doc/init.txt
View File

@ -299,6 +299,27 @@ as LOG output. To enable the verbose mode, assign the value "yes" to the
'verbose' attribute of the '<config>' node.
Propagation of exit events
==========================
A component can notify its parent about its graceful exit via the exit RPC
function of the parent interface. By default, init responds to such a
notification from one of its children by merely printing a log message but
ignores it otherwise. However, there are scenarios where the exit of a
particular child should result in the exit of the entire init component. To
propagate the exit of a child to the parent of init, start nodes can host the
optional sub node '<exit>' with the attribute 'propagate' set to "yes".
! <config>
! <start name="noux">
! <exit propagate="yes"/>
! ...
! </start>
! </config>
The exit value specified by the exiting child is forwarded to init's parent.
Executing children in chroot environments on Linux
==================================================

17
repos/os/include/init/child.h
View File

@ -802,6 +802,23 @@ class Init::Child : Genode::Child_policy
_child.notify_resource_avail();
}
void exit(int exit_value) override
{
try {
if (_start_node.sub_node("exit").attribute("propagate").has_value("yes")) {
Genode::env()->parent()->exit(exit_value);
return;
}
} catch (...) { }
/*
* Print a message as the exit is not handled otherwise. There are
* a number of automated tests that rely on this message. It is
* printed by the default implementation of 'Child_policy::exit'.
*/
Child_policy::exit(exit_value);
}
Genode::Native_pd_args const *pd_args() const { return &_pd_args; }
};