wait2
Process.wait2 -> anArray
Waits for any child process to exit and returns an array containing the process id and the exit status of that child. Raises a SystemError if there are no child processes.
Process.fork { exit 1 } » 1503
Process.wait2 » [1503, 256]

waitpid
Process.waitpid( aPid, anInteger=0 ) -> aPid
Waits for the given child process to exit. anInteger may be a logical or of the flag value Process::WNOHANG (do not block if no child available) or Process::WUNTRACED (return stopped children that haven't been reported). Not all flags are available on all platforms, but a flag value of zero will work on all platforms.

include Process
pid = fork { sleep 3 } » 1506
Time.now » Sun Jun 09 00:20:09 CDT 2002
waitpid(pid, Process::WNOHANG) » nil
Time.now » Sun Jun 09 00:20:09 CDT 2002
waitpid(pid, 0) » 1506
Time.now » Sun Jun 09 00:20:12 CDT 2002

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