Returns the exit status of the child process that open-pipe created.
pipe-exit-status returns the exit status of the child process that open-pipe created.
stream must be a pipe stream object which was returned by a call to open-pipe with save-exit-status non-nil.
If wait is
pipe-exit-status waits until the child process dies. If wait is nil then
pipe-exit-status does not wait, and if the child process is still running it returns
nil. The default value of wait is
On Microsoft Windows, if close was called on the stream before the child process died, then
pipe-exit-status returns exit-status
:closed. On Unix-like systems it works after close but for compatibility it should be called only before calling close.
If exit-status is not
:closed, it is an integer which is the exit status of the child process. See Interpreting the exit status for the interpretation of the exit status and the signal number.
LispWorks User Guide and Reference Manual - 13 Feb 2015