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alcove

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Control plane for Unix processes, containers and sandboxes

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alcove edoc waitpid-4.edoc
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edoc/waitpid-4.edoc 

@doc waitpid(2): wait for process to change state



Process state changes are handled by the alcove SIGCHLD event handler

by default. To use waitpid/4,5, disable the signal handler:



```

alcove:sigaction(Drv, [Pid], sigchld, sig_info)

'''



Note: if the default SIGCHLD handler is disabled, waitpid/4,5 should be

called to reap zombie processes:



```

alcove:waitpid(Drv, [], -1, [wnohang])

'''



== Examples ==



```

1> {ok, Drv} = alcove_drv:start().

{ok,<0.177.0>}

2> {ok, Pid} = alcove:fork(Drv, []).

{ok,28978}

3> alcove:sigaction(Drv, [Pid], sigchld, sig_info).

{ok,sig_dfl}

4> alcove:execvp(Drv, [Pid], "sleep", ["sleep", "20"]).

ok

5> alcove:waitpid(Drv, [], -1, []).

{ok,28978,0,[{exit_status,0}]}

'''