os/proc-kill

    cfunction
    src/core/os.c on line 799, column 1

    (os/proc-kill proc &opt wait which)

    Kill the subprocess `proc` by sending SIGKILL to it on POSIX 
    systems, or by closing the process handle on Windows. If `proc` has 
    already completed, raise an error. If `wait` is truthy, waits for 
    `proc` to complete and return the exit code (this raises an error 
    if `proc` is being waited for). Otherwise, return `proc`. Optional 
    argument `which` is a keyword named after its C counterpart but in 
    lowercase with the leading SIG stripped. If `which` is provided, 
    the corresponding signal is sent instead of SIGKILL. `which` is 
    ignored on Windows.