Signal

(typename $signal
  (enum (@witx tag u8)
    ;;; No signal. Note that POSIX has special semantics for `kill(pid, 0)`,
    ;;; so this value is reserved.
    $none
    ;;; Hangup.
    ;;; Action: Terminates the process.
    $hup
    ;;; Terminate interrupt signal.
    ;;; Action: Terminates the process.
    $int
    ;;; Terminal quit signal.
    ;;; Action: Terminates the process.
    $quit
    ;;; Illegal instruction.
    ;;; Action: Terminates the process.
    $ill
    ;;; Trace/breakpoint trap.
    ;;; Action: Terminates the process.
    $trap
    ;;; Process abort signal.
    ;;; Action: Terminates the process.
    $abrt
    ;;; Access to an undefined portion of a memory object.
    ;;; Action: Terminates the process.
    $bus
    ;;; Erroneous arithmetic operation.
    ;;; Action: Terminates the process.
    $fpe
    ;;; Kill.
    ;;; Action: Terminates the process.
    $kill
    ;;; User-defined signal 1.
    ;;; Action: Terminates the process.
    $usr1
    ;;; Invalid memory reference.
    ;;; Action: Terminates the process.
    $segv
    ;;; User-defined signal 2.
    ;;; Action: Terminates the process.
    $usr2
    ;;; Write on a pipe with no one to read it.
    ;;; Action: Ignored.
    $pipe
    ;;; Alarm clock.
    ;;; Action: Terminates the process.
    $alrm
    ;;; Termination signal.
    ;;; Action: Terminates the process.
    $term
    ;;; Child process terminated, stopped, or continued.
    ;;; Action: Ignored.
    $chld
    ;;; Continue executing, if stopped.
    ;;; Action: Continues executing, if stopped.
    $cont
    ;;; Stop executing.
    ;;; Action: Stops executing.
    $stop
    ;;; Terminal stop signal.
    ;;; Action: Stops executing.
    $tstp
    ;;; Background process attempting read.
    ;;; Action: Stops executing.
    $ttin
    ;;; Background process attempting write.
    ;;; Action: Stops executing.
    $ttou
    ;;; High bandwidth data is available at a socket.
    ;;; Action: Ignored.
    $urg
    ;;; CPU time limit exceeded.
    ;;; Action: Terminates the process.
    $xcpu
    ;;; File size limit exceeded.
    ;;; Action: Terminates the process.
    $xfsz
    ;;; Virtual timer expired.
    ;;; Action: Terminates the process.
    $vtalrm
    ;;; Profiling timer expired.
    ;;; Action: Terminates the process.
    $prof
    ;;; Window changed.
    ;;; Action: Ignored.
    $winch
    ;;; I/O possible.
    ;;; Action: Terminates the process.
    $poll
    ;;; Power failure.
    ;;; Action: Terminates the process.
    $pwr
    ;;; Bad system call.
    ;;; Action: Terminates the process.
    $sys
  )
)