f07505d1ec
* lisp/eshell/esh-proc.el (eshell-put-process-properties): Pass INDEX. (eshell-gather-process-output): Create a pipe process for stderr when stderr goes somewhere different than stdout. (eshell-insertion-filter, eshell-sentinel): Consult ':eshell-handle-index' property. * test/lisp/eshell/esh-proc-tests.el (esh-proc-test/output/stdout-to-buffer) (esh-proc-test/output/stderr-to-buffer) (esh-proc-test/exit-status/with-stderr-pipe): New tests (bug#21605).
589 lines
23 KiB
EmacsLisp
589 lines
23 KiB
EmacsLisp
;;; esh-proc.el --- process management -*- lexical-binding:t -*-
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;; Copyright (C) 1999-2022 Free Software Foundation, Inc.
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;; Author: John Wiegley <johnw@gnu.org>
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(require 'esh-io)
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(defgroup eshell-proc nil
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"When Eshell invokes external commands, it always does so
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asynchronously, so that Emacs isn't tied up waiting for the process to
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finish."
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:tag "Process management"
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:group 'eshell)
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;;; User Variables:
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(defcustom eshell-proc-load-hook nil
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"A hook that gets run when `eshell-proc' is loaded."
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:version "24.1" ; removed eshell-proc-initialize
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:type 'hook)
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(defcustom eshell-process-wait-seconds 0
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"The number of seconds to delay waiting for a synchronous process."
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:type 'integer)
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(defcustom eshell-process-wait-milliseconds 50
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"The number of milliseconds to delay waiting for a synchronous process."
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:type 'integer)
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(defcustom eshell-done-messages-in-minibuffer t
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"If non-nil, subjob \"Done\" messages will display in minibuffer."
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:type 'boolean)
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(defcustom eshell-delete-exited-processes t
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"If nil, process entries will stick around until `jobs' is run.
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This variable sets the buffer-local value of `delete-exited-processes'
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in Eshell buffers.
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This variable causes Eshell to mimic the behavior of bash when set to
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nil. It allows the user to view the exit status of a completed subjob
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\(process) at their leisure, because the process entry remains in
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memory until the user examines it using \\[list-processes].
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Otherwise, if `eshell-done-messages-in-minibuffer' is nil, and this
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variable is set to t, the only indication the user will have that a
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subjob is done is that it will no longer appear in the
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\\[list-processes\\] display.
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Note that Eshell will have to be restarted for a change in this
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variable's value to take effect."
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:type 'boolean)
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(defcustom eshell-reset-signals
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"^\\(interrupt\\|killed\\|quit\\|stopped\\)"
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"If a termination signal matches this regexp, the terminal will be reset."
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:type 'regexp)
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(defcustom eshell-exec-hook nil
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"Called each time a process is exec'd by `eshell-gather-process-output'.
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It is passed one argument, which is the process that was just started.
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It is useful for things that must be done each time a process is
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executed in an eshell mode buffer (e.g., `set-process-query-on-exit-flag').
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In contrast, `eshell-mode-hook' is only executed once, when the buffer
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is created."
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:type 'hook)
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(defcustom eshell-kill-hook nil
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"Called when a process run by `eshell-gather-process-output' has ended.
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It is passed two arguments: the process that was just ended, and the
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termination status (as a string). Note that the first argument may be
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nil, in which case the user attempted to send a signal, but there was
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no relevant process. This can be used for displaying help
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information, for example."
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:version "24.1" ; removed eshell-reset-after-proc
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:type 'hook)
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;;; Internal Variables:
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(defvar eshell-current-subjob-p nil)
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(defvar eshell-process-list nil
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"A list of the current status of subprocesses.
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Each element has the form (PROC . SUBJOB-P), where PROC is the
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process object and SUBJOB-P is non-nil if the process is a
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subjob.
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To add or remove elements of this list, see
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`eshell-record-process-object' and `eshell-remove-process-entry'.")
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(declare-function eshell-send-eof-to-process "esh-mode")
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(declare-function eshell-tail-process "esh-cmd")
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(defvar-keymap eshell-proc-mode-map
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"C-c M-i" #'eshell-insert-process
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"C-c C-c" #'eshell-interrupt-process
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"C-c C-k" #'eshell-kill-process
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"C-c C-d" #'eshell-send-eof-to-process
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"C-c C-s" #'list-processes
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"C-c C-\\" #'eshell-quit-process)
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;;; Functions:
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(defun eshell-kill-process-function (proc status)
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"Function run when killing a process.
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Runs `eshell-reset-after-proc' and `eshell-kill-hook', passing arguments
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PROC and STATUS to functions on the latter."
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;; Was there till 24.1, but it is not optional.
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(remove-hook 'eshell-kill-hook #'eshell-reset-after-proc)
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;; Only reset the prompt if this process is running interactively.
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(when (eq proc (eshell-tail-process))
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(eshell-reset-after-proc status))
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(run-hook-with-args 'eshell-kill-hook proc status))
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(define-minor-mode eshell-proc-mode
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"Minor mode for the proc eshell module.
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\\{eshell-proc-mode-map}"
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:keymap eshell-proc-mode-map)
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(defun eshell-proc-initialize () ;Called from `eshell-mode' via intern-soft!
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"Initialize the process handling code."
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(make-local-variable 'eshell-process-list)
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(eshell-proc-mode))
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(defun eshell-reset-after-proc (status)
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"Reset the command input location after a process terminates.
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The signals which will cause this to happen are matched by
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`eshell-reset-signals'."
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(when (and (stringp status)
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(string-match eshell-reset-signals status))
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(require 'esh-mode)
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(declare-function eshell-reset "esh-mode" (&optional no-hooks))
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(eshell-reset)))
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(defun eshell-wait-for-process (&rest procs)
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"Wait until PROC has successfully completed."
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(while procs
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(let ((proc (car procs)))
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(when (eshell-processp proc)
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;; NYI: If the process gets stopped here, that's bad.
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(while (assq proc eshell-process-list)
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(if (input-pending-p)
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(discard-input))
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(sit-for eshell-process-wait-seconds
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eshell-process-wait-milliseconds))))
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(setq procs (cdr procs))))
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(defalias 'eshell/wait #'eshell-wait-for-process)
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(defun eshell/jobs (&rest _args)
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"List processes, if there are any."
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(and (fboundp 'process-list)
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(process-list)
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(list-processes)))
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(defun eshell/kill (&rest args)
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"Kill processes.
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Usage: kill [-<signal>] <pid>|<process> ...
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Accepts PIDs and process objects. Optionally accept signals
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and signal names."
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;; If the first argument starts with a dash, treat it as the signal
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;; specifier.
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(let ((signum 'SIGINT))
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(let ((arg (car args))
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(case-fold-search nil))
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(when (stringp arg)
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(cond
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((string-match "\\`-[[:digit:]]+\\'" arg)
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(setq signum (abs (string-to-number arg))))
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((string-match "\\`-\\([[:upper:]]+\\|[[:lower:]]+\\)\\'" arg)
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(setq signum (intern (substring arg 1)))))
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(setq args (cdr args))))
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(while args
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(let ((arg (if (eshell-processp (car args))
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(process-id (car args))
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(string-to-number (car args)))))
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(when arg
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(cond
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((null arg)
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(error "kill: null pid. Process may actually be a network connection."))
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((not (numberp arg))
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(error "kill: invalid argument type: %s" (type-of arg)))
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((and (numberp arg)
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(<= arg 0))
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(error "kill: bad pid: %d" arg))
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(t
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(signal-process arg signum)))))
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(setq args (cdr args))))
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nil)
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(put 'eshell/kill 'eshell-no-numeric-conversions t)
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(defun eshell-read-process-name (prompt)
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"Read the name of a process from the minibuffer, using completion.
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The prompt will be set to PROMPT."
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(completing-read prompt
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(mapcar
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(lambda (proc)
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(cons (process-name proc) t))
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(process-list))
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nil t))
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(defun eshell-insert-process (process)
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"Insert the name of PROCESS into the current buffer at point."
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(interactive
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(list (get-process
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(eshell-read-process-name "Name of process: "))))
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(insert-and-inherit "#<process " (process-name process) ">"))
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(defsubst eshell-record-process-object (object)
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"Record OBJECT as now running."
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(when (and (eshell-processp object)
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eshell-current-subjob-p)
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(require 'esh-mode)
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(declare-function eshell-interactive-print "esh-mode" (string))
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(eshell-interactive-print
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(format "[%s] %d\n" (process-name object) (process-id object))))
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(push (cons object eshell-current-subjob-p) eshell-process-list))
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(defun eshell-remove-process-entry (entry)
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"Record the process ENTRY as fully completed."
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(if (and (eshell-processp (car entry))
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(cdr entry)
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eshell-done-messages-in-minibuffer)
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(message "[%s]+ Done %s" (process-name (car entry))
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(process-command (car entry))))
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(setq eshell-process-list
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(delq entry eshell-process-list)))
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(defun eshell-record-process-properties (process &optional index)
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"Record Eshell bookkeeping properties for PROCESS.
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`eshell-insertion-filter' and `eshell-sentinel' will use these to
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do their jobs.
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INDEX is the index of the output handle to use for writing; if
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nil, write to `eshell-output-handle'."
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(process-put process :eshell-handles eshell-current-handles)
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(process-put process :eshell-handle-index (or index eshell-output-handle))
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(process-put process :eshell-pending nil)
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(process-put process :eshell-busy nil))
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(defvar eshell-scratch-buffer " *eshell-scratch*"
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"Scratch buffer for holding Eshell's input/output.")
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(defvar eshell-last-sync-output-start nil
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"A marker that tracks the beginning of output of the last subprocess.
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Used only on systems which do not support async subprocesses.")
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(defun eshell-gather-process-output (command args)
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"Gather the output from COMMAND + ARGS."
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(require 'esh-var)
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(declare-function eshell-environment-variables "esh-var" ())
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(unless (and (file-executable-p command)
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(file-regular-p (file-truename command)))
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(error "%s: not an executable file" command))
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(let* ((delete-exited-processes
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(if eshell-current-subjob-p
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eshell-delete-exited-processes
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delete-exited-processes))
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(process-environment (eshell-environment-variables))
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proc stderr-proc decoding encoding changed)
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(cond
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((fboundp 'make-process)
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(unless (equal (car (aref eshell-current-handles eshell-output-handle))
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(car (aref eshell-current-handles eshell-error-handle)))
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(eshell-protect-handles eshell-current-handles)
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(setq stderr-proc
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(make-pipe-process
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:name (concat (file-name-nondirectory command) "-stderr")
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:buffer (current-buffer)
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:filter (if (eshell-interactive-output-p eshell-error-handle)
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#'eshell-output-filter
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#'eshell-insertion-filter)
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:sentinel #'eshell-sentinel))
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(eshell-record-process-properties stderr-proc eshell-error-handle))
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(setq proc
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(let ((command (file-local-name (expand-file-name command)))
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(conn-type (pcase (bound-and-true-p eshell-in-pipeline-p)
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('first '(nil . pipe))
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('last '(pipe . nil))
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('t 'pipe)
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('nil nil))))
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(make-process
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:name (file-name-nondirectory command)
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:buffer (current-buffer)
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:command (cons command args)
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:filter (if (eshell-interactive-output-p)
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#'eshell-output-filter
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#'eshell-insertion-filter)
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:sentinel #'eshell-sentinel
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:connection-type conn-type
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:stderr stderr-proc
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:file-handler t)))
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(eshell-record-process-object proc)
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(eshell-record-process-properties proc)
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(run-hook-with-args 'eshell-exec-hook proc)
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(when (fboundp 'process-coding-system)
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(let ((coding-systems (process-coding-system proc)))
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(setq decoding (car coding-systems)
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encoding (cdr coding-systems)))
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;; If `make-process' decided to use some coding system for
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;; decoding data sent from the process and the coding system
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;; doesn't specify EOL conversion, we had better convert CRLF
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;; to LF.
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(if (vectorp (coding-system-eol-type decoding))
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(setq decoding (coding-system-change-eol-conversion decoding 'dos)
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changed t))
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;; Even if `make-process' left the coding system for encoding
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;; data sent from the process undecided, we had better use the
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;; same one as what we use for decoding. But, we should
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;; suppress EOL conversion.
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(if (and decoding (not encoding))
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(setq encoding (coding-system-change-eol-conversion decoding 'unix)
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changed t))
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(if changed
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(set-process-coding-system proc decoding encoding))))
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(t
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;; No async subprocesses...
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(let ((oldbuf (current-buffer))
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(interact-p (eshell-interactive-output-p))
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lbeg lend line proc-buf exit-status)
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(and (not (markerp eshell-last-sync-output-start))
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(setq eshell-last-sync-output-start (point-marker)))
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(setq proc-buf
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(set-buffer (get-buffer-create eshell-scratch-buffer)))
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(erase-buffer)
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(set-buffer oldbuf)
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(run-hook-with-args 'eshell-exec-hook command)
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(setq exit-status
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(apply #'call-process-region
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(append (list eshell-last-sync-output-start (point)
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command t
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eshell-scratch-buffer nil)
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args)))
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;; When in a pipeline, record the place where the output of
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;; this process will begin.
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(and (bound-and-true-p eshell-in-pipeline-p)
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(set-marker eshell-last-sync-output-start (point)))
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;; Simulate the effect of the process filter.
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(when (numberp exit-status)
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(set-buffer proc-buf)
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(goto-char (point-min))
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(setq lbeg (point))
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(while (eq 0 (forward-line 1))
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(setq lend (point)
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line (buffer-substring-no-properties lbeg lend))
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(set-buffer oldbuf)
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(if interact-p
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(eshell-output-filter nil line)
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(eshell-output-object line))
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(setq lbeg lend)
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(set-buffer proc-buf))
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(set-buffer oldbuf))
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(require 'esh-mode)
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(declare-function eshell-update-markers "esh-mode" (pmark))
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(defvar eshell-last-output-end) ;Defined in esh-mode.el.
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(eshell-update-markers eshell-last-output-end)
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;; Simulate the effect of eshell-sentinel.
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(eshell-close-handles
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(if (numberp exit-status) exit-status -1)
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(list 'quote (and (numberp exit-status) (= exit-status 0))))
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(eshell-kill-process-function command exit-status)
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(or (bound-and-true-p eshell-in-pipeline-p)
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(setq eshell-last-sync-output-start nil))
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(if (not (numberp exit-status))
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(error "%s: external command failed: %s" command exit-status))
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(setq proc t))))
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proc))
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(defun eshell-insertion-filter (proc string)
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"Insert a string into the eshell buffer, or a process/file/buffer.
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PROC is the process for which we're inserting output. STRING is the
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output."
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(when (buffer-live-p (process-buffer proc))
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(with-current-buffer (process-buffer proc)
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(process-put proc :eshell-pending
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(concat (process-get proc :eshell-pending)
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string))
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(unless (process-get proc :eshell-busy) ; Already being handled?
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(while (process-get proc :eshell-pending)
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(let ((handles (process-get proc :eshell-handles))
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(index (process-get proc :eshell-handle-index))
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(data (process-get proc :eshell-pending)))
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(process-put proc :eshell-pending nil)
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(process-put proc :eshell-busy t)
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(unwind-protect
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(condition-case nil
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(eshell-output-object data index handles)
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;; FIXME: We want to send SIGPIPE to the process
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;; here. However, remote processes don't currently
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;; support that, and not all systems have SIGPIPE in
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;; the first place (e.g. MS Windows). In these
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;; cases, just delete the process; this is
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;; reasonably close to the right behavior, since the
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;; default action for SIGPIPE is to terminate the
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;; process. For use cases where SIGPIPE is truly
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;; needed, using an external pipe operator (`*|')
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;; may work instead (e.g. when working with remote
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;; processes).
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(eshell-pipe-broken
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(if (or (process-get proc 'remote-pid)
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(eq system-type 'windows-nt))
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(delete-process proc)
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(signal-process proc 'SIGPIPE))))
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(process-put proc :eshell-busy nil))))))))
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(defun eshell-sentinel (proc string)
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"Generic sentinel for command processes. Reports only signals.
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PROC is the process that's exiting. STRING is the exit message."
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(when (buffer-live-p (process-buffer proc))
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(with-current-buffer (process-buffer proc)
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(unwind-protect
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(unless (string= string "run")
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;; Write the exit message if the status is abnormal and
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;; the process is already writing to the terminal.
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(when (and (eq proc (eshell-tail-process))
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(not (string-match "^\\(finished\\|exited\\)"
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string)))
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(funcall (process-filter proc) proc string))
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(let* ((handles (process-get proc :eshell-handles))
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(index (process-get proc :eshell-handle-index))
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(data (process-get proc :eshell-pending))
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;; Only get the status for the primary subprocess,
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;; not the pipe process (if any).
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(status (when (= index eshell-output-handle)
|
|
(process-exit-status proc))))
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|
(process-put proc :eshell-pending nil)
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|
;; If we're in the middle of handling output from this
|
|
;; process then schedule the EOF for later.
|
|
(letrec ((finish-io
|
|
(lambda ()
|
|
(if (process-get proc :eshell-busy)
|
|
(run-at-time 0 nil finish-io)
|
|
(when data
|
|
(ignore-error 'eshell-pipe-broken
|
|
(eshell-output-object
|
|
data index handles)))
|
|
(eshell-close-handles
|
|
status
|
|
(when status (list 'quote (= status 0)))
|
|
handles)))))
|
|
(funcall finish-io))))
|
|
(when-let ((entry (assq proc eshell-process-list)))
|
|
(eshell-remove-process-entry entry))
|
|
(eshell-kill-process-function proc string)))))
|
|
|
|
(defun eshell-process-interact (func &optional all query)
|
|
"Interact with a process, using PROMPT if more than one, via FUNC.
|
|
If ALL is non-nil, background processes will be interacted with as well.
|
|
If QUERY is non-nil, query the user with QUERY before calling FUNC."
|
|
(let (defunct result)
|
|
(dolist (entry eshell-process-list)
|
|
(if (and (memq (process-status (car entry))
|
|
'(run stop open closed))
|
|
(or all
|
|
(not (cdr entry)))
|
|
(or (not query)
|
|
(y-or-n-p (format-message query
|
|
(process-name (car entry))))))
|
|
(setq result (funcall func (car entry))))
|
|
(unless (memq (process-status (car entry))
|
|
'(run stop open closed))
|
|
(setq defunct (cons entry defunct))))
|
|
;; clean up the process list; this can get dirty if an error
|
|
;; occurred that brought the user into the debugger, and then they
|
|
;; quit, so that the sentinel was never called.
|
|
(dolist (d defunct)
|
|
(eshell-remove-process-entry d))
|
|
result))
|
|
|
|
(defcustom eshell-kill-process-wait-time 5
|
|
"Seconds to wait between sending termination signals to a subprocess."
|
|
:type 'integer)
|
|
|
|
(defcustom eshell-kill-process-signals '(SIGINT SIGQUIT SIGKILL)
|
|
"Signals used to kill processes when an Eshell buffer exits.
|
|
Eshell calls each of these signals in order when an Eshell buffer is
|
|
killed; if the process is still alive afterwards, Eshell waits a
|
|
number of seconds defined by `eshell-kill-process-wait-time', and
|
|
tries the next signal in the list."
|
|
:type '(repeat symbol))
|
|
|
|
(defcustom eshell-kill-processes-on-exit nil
|
|
"If non-nil, kill active processes when exiting an Eshell buffer.
|
|
Emacs will only kill processes owned by that Eshell buffer.
|
|
|
|
If nil, ownership of background and foreground processes reverts to
|
|
Emacs itself, and will die only if the user exits Emacs, calls
|
|
`kill-process', or terminates the processes externally.
|
|
|
|
If `ask', Emacs prompts the user before killing any processes.
|
|
|
|
If `every', it prompts once for every process.
|
|
|
|
If t, it kills all buffer-owned processes without asking.
|
|
|
|
Processes are first sent SIGHUP, then SIGINT, then SIGQUIT, then
|
|
SIGKILL. The variable `eshell-kill-process-wait-time' specifies how
|
|
long to delay between signals."
|
|
:type '(choice (const :tag "Kill all, don't ask" t)
|
|
(const :tag "Ask before killing" ask)
|
|
(const :tag "Ask for each process" every)
|
|
(const :tag "Don't kill subprocesses" nil)))
|
|
|
|
(defun eshell-round-robin-kill (&optional query)
|
|
"Kill current process by trying various signals in sequence.
|
|
See the variable `eshell-kill-processes-on-exit'."
|
|
(let ((sigs eshell-kill-process-signals))
|
|
(while sigs
|
|
(eshell-process-interact
|
|
(lambda (proc)
|
|
(signal-process (process-id proc) (car sigs))) t query)
|
|
(setq query nil)
|
|
(if (not eshell-process-list)
|
|
(setq sigs nil)
|
|
(sleep-for eshell-kill-process-wait-time)
|
|
(setq sigs (cdr sigs))))))
|
|
|
|
(defun eshell-query-kill-processes ()
|
|
"Kill processes belonging to the current Eshell buffer, possibly w/ query."
|
|
(when (and eshell-kill-processes-on-exit
|
|
eshell-process-list)
|
|
(save-window-excursion
|
|
(list-processes)
|
|
(if (or (not (eq eshell-kill-processes-on-exit 'ask))
|
|
(y-or-n-p (format-message "Kill processes owned by `%s'? "
|
|
(buffer-name))))
|
|
(eshell-round-robin-kill
|
|
(if (eq eshell-kill-processes-on-exit 'every)
|
|
"Kill Eshell child process `%s'? ")))
|
|
(let ((buf (get-buffer "*Process List*")))
|
|
(if (and buf (buffer-live-p buf))
|
|
(kill-buffer buf)))
|
|
(message nil))))
|
|
|
|
(defun eshell-interrupt-process ()
|
|
"Interrupt a process."
|
|
(interactive)
|
|
(unless (eshell-process-interact 'interrupt-process)
|
|
(eshell-kill-process-function nil "interrupt")))
|
|
|
|
(defun eshell-kill-process ()
|
|
"Kill a process."
|
|
(interactive)
|
|
(unless (eshell-process-interact 'kill-process)
|
|
(eshell-kill-process-function nil "killed")))
|
|
|
|
(defun eshell-quit-process ()
|
|
"Send quit signal to process."
|
|
(interactive)
|
|
(unless (eshell-process-interact 'quit-process)
|
|
(eshell-kill-process-function nil "quit")))
|
|
|
|
;(defun eshell-stop-process ()
|
|
; "Send STOP signal to process."
|
|
; (interactive)
|
|
; (unless (eshell-process-interact 'stop-process)
|
|
; (eshell-kill-process-function nil "stopped")))
|
|
|
|
;(defun eshell-continue-process ()
|
|
; "Send CONTINUE signal to process."
|
|
; (interactive)
|
|
; (unless (eshell-process-interact 'continue-process)
|
|
; ;; jww (1999-09-17): this signal is not dealt with yet. For
|
|
; ;; example, `eshell-reset' will be called, and so will
|
|
; ;; `eshell-resume-eval'.
|
|
; (eshell-kill-process-function nil "continue")))
|
|
|
|
(provide 'esh-proc)
|
|
;;; esh-proc.el ends here
|