Daemonize sessiond on lttng create
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eepp
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Since the session daemon forked by `lttng create` shares its
standard output/error FDs when not using `--daemonize`, redirecting
the standard output/error of this command to another program "hangs"
because the session daemon never terminates.
Example that's not working (when sessiond is not running):
lttng create | wc
or:
lttng 2>&1 | wc
Using sessiond's `--daemonize` option makes it close its FDs. This
option also ensures that when the sessiond process exits, it has forked
itself as a daemon and is ready to accept commands. Therefore we don't
need to catch SIGCHLD and SIGUSR1; just waitpid() on sessiond's PID and
make sure it exited normally and with an exit status of 0 to continue.
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Merged with modifications, thanks! |
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