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Makes it easier to find out that something went wrong.
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Mimick shells and exit with a status >128 if our child has been
signalled. Exiting with 128 + signal number is what most shells do
(POSIX only requires them to exit with >128).
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The command indexing had not been updated afer the introduction of
getopt, so combining a command with flags would fail.
Add error handling for if no command was specified while we're at it.
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$ seatd-launch sway -c /dev/null
Could not start target: No such file or directory
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Instead of relying on seatd's user/group arguments, which require
turning our UID back into a username, just chmod/chown the socket
ourselves once seatd is ready.
We also reduce the permissions to just user access, instead of user and
group like seatd specifies.
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While forked (child pid is zero), don't use gotos. These will
execute atexit functions and potentially mess up the stdlib.
Instead, use _exit.
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When the child process exits with a non-zero code or is killed,
return with a non-zero code as well.
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This launch wrapper is used to conveniently start a new seatd instance,
wait for it to be ready, and launch a target application.
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