Re: pass-through persist and daemon re-configuration with HUP signal

On Mon, 23 Oct 2006 17:52:43 +0200 Anthony wrote:
AN> Normally, the daemon re-reads it's configuration files when sent a HUP
AN> signal. However when using pass_persist, the daemon becomes blocked after
AN> receiving the HUP signal because the daemon calls the waitpid function for
AN> the PID of the pass-through executable (line 771 of
AN> agent/mibgroup/ucd-snmp/pass_persist.c in the close_persist_pipe function).
AN> In the absence of the WNOHANG option, this function blocks until the child
AN> process has changed state. However, the child process is never informed
AN> that it should terminate.

It is informed, by closing the fd used to communicate with the process.

AN> In my pass-through executable, the process
AN> continually loops until standard input is received (but will terminate when
AN> a TERM signal is received).

You should be getting a SIGPIPE when you select on stdin, since it has been
closed.

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