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In the future we might want to allow additional syntax (for example
"unset VAR". But let's check that the data we're getting does not contain
anything unexpected.
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Only tests are added, otherwise the new code is unused.
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The output of processes can be gathered, and passed back to the callee.
(This commit just implements the basic functionality and tests.)
After the preparation in previous commits, the change in functionality is
relatively simple. For coding convenience, alarm is prepared *before* any
children are executed, and not before. This shouldn't matter usually, since
just forking of the children should be pretty quick. One could also argue that
this is more correct, because we will also catch the case when (for whatever
reason), forking itself is slow.
Three callback functions and three levels of serialization are used:
- from individual generator processes to the generator forker
- from the forker back to the main process
- deserialization in the main process
v2:
- replace an structure with an indexed array of callbacks
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Essentially the same logic as in conf_files_list() was independently implemented in
do_execute(). With previous commit, do_execute() can just call conf_files_list() to
get a list of executable paths.
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This corrects an error in error handling: if execution fails, we should
never use return, but immediately _exit().
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It's a fairly specialized function. Let's make new files for it and the tests.
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