os/proc-wait

    cfunction
    src/core/os.c on line 656, column 1

    (os/proc-wait proc)

    Suspend the current fiber until the subprocess `proc` completes. 
    Once `proc` completes, return the exit code of `proc`. If called 
    more than once on the same core/process value, will raise an error. 
    When creating subprocesses using `os/spawn`, this function should 
    be called on the returned value to avoid zombie processes.