diff options
Diffstat (limited to 'doc/lispref')
| -rw-r--r-- | doc/lispref/processes.texi | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/doc/lispref/processes.texi b/doc/lispref/processes.texi index 535cebed7a8..6dedaa31f2e 100644 --- a/doc/lispref/processes.texi +++ b/doc/lispref/processes.texi @@ -729,7 +729,9 @@ coding systems (@pxref{Default Coding Systems}). On the other hand, it will use @var{query-flag} as its query-on-exit flag (@pxref{Query Before Exit}). It will be associated with the @var{stderr} buffer (@pxref{Process Buffers}) and send its output (which is the standard -error of the main process) there. +error of the main process) there. To get the process object for the +standard error process, pass the @var{stderr} buffer to +@code{get-buffer-process}. If @var{stderr} is a pipe process, Emacs will use it as standard error process for the new process. @@ -1942,6 +1944,29 @@ code: (while (accept-process-output stderr-process)) @end example +If you passed a buffer to the @var{stderr} argument of +@code{make-process}, you still have to wait for the standard error +process, like so: + +@example +(let* ((stdout (generate-new-buffer "stdout")) + (stderr (generate-new-buffer "stderr")) + (process (make-process :name "test" + :command '("my-program") + :buffer stdout + :stderr stderr)) + (stderr-process (get-buffer-process stderr))) + (unless (and process stderr-process) + (error "Process unexpectedly nil")) + (while (accept-process-output process)) + (while (accept-process-output stderr-process))) +@end example + +@noindent +Only when both @code{accept-process-output} forms return @code{nil}, +you can be sure that the process has exited and Emacs has read all its +output. + Reading pending standard error from a process running on a remote host is not possible this way. |