GNU Emacs for PSD https://savannah.gnu.org/git/?group=emacs
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![]() This is a backport from the trunk, consisting of: 2012-11-17 Eli Zaretskii <eliz@gnu.org> * nt/inc/sys/wait.h: New file, with prototype of waitpid and definitions of macros it needs. * nt/inc/ms-w32.h (wait): Don't define, 'wait' is not used anymore. (sys_wait): Remove prototype. * nt/config.nt (HAVE_SYS_WAIT_H): Define to 1. * src/w32proc.c (create_child): Don't clip the PID of the child process to fit into an Emacs integer, as this is no longer a restriction. (waitpid): Rename from sys_wait. Emulate a Posix 'waitpid' by reaping only the process specified by PID argument, if that is positive. Use PID instead of dead_child to know which process to reap. Wait for the child to die only if WNOHANG is not in OPTIONS. (sys_select): Don't set dead_child. * src/sysdep.c (wait_for_termination_1): Remove the WINDOWSNT portion, as it is no longer needed. * src/process.c (waitpid, WUNTRACED) [!WNOHANG]: Remove definitions, no longer needed. (record_child_status_change): Remove the setting of record_at_most_one_child for the !WNOHANG case. 2012-11-03 Paul Eggert <eggert@cs.ucla.edu> Fix a race condition that causes Emacs to mess up glib (Bug#8855). This is a backport from the trunk. The symptom is a diagnostic "GLib-WARNING **: In call to g_spawn_sync(), exit status of a child process was requested but SIGCHLD action was set to SIG_IGN and ECHILD was received by waitpid(), so exit status can't be returned." The diagnostic is partly wrong, as the SIGCHLD action is not set to SIG_IGN. The real bug is a race condition between Emacs and glib: Emacs does a waitpid (-1, ...) and reaps glib's subprocess by mistake, so that glib can't find it. Work around the bug by invoking waitpid only on subprocesses that Emacs itself creates. * src/process.c (create_process, record_child_status_change): Don't use special value -1 in pid field, as the caller now must know the pid rather than having the callee infer it. The inference was sometimes incorrect anyway, due to another race. (create_process): Set new 'alive' member if child is created. (process_status_retrieved): New function. (record_child_status_change): Use it. Accept negative 1st argument, which means to wait for the processes that Emacs already knows about. Move special-case code for DOS_NT (which lacks WNOHANG) here, from caller. Keep track of processes that have already been waited for, by testing and clearing new 'alive' member. (CAN_HANDLE_MULTIPLE_CHILDREN): Remove, as record_child_status_change now does this internally. (handle_child_signal): Let record_child_status_change do all the work, since we do not want to reap all exited child processes, only the child processes that Emacs itself created. * src/process.h (Lisp_Process): New boolean member 'alive'. |
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README |
Copyright (C) 2001-2012 Free Software Foundation, Inc. See the end of the file for license conditions. This directory tree holds version 24.2.50 of GNU Emacs, the extensible, customizable, self-documenting real-time display editor. The file INSTALL in this directory says how to build and install GNU Emacs on various systems, once you have unpacked or checked out the entire Emacs file tree. See the file etc/NEWS for information on new features and other user-visible changes in recent versions of Emacs. The file etc/PROBLEMS contains information on many common problems that occur in building, installing and running Emacs. You may encounter bugs in this release. If you do, please report them; your bug reports are valuable contributions to the FSF, since they allow us to notice and fix problems on machines we don't have, or in code we don't use often. Please send bug reports to the mailing list bug-gnu-emacs@gnu.org. If possible, use M-x report-emacs-bug. See the "Bugs" section of the Emacs manual for more information on how to report bugs. (The file `BUGS' in this directory explains how you can find and read that section using the Info files that come with Emacs.) See `etc/MAILINGLISTS' for more information on mailing lists relating to GNU packages. The `etc' subdirectory contains several other files, named in capital letters, which you might consider looking at when installing GNU Emacs. The file `configure' is a shell script to acclimate Emacs to the oddities of your processor and operating system. It creates the file `Makefile' (a script for the `make' program), which automates the process of building and installing Emacs. See INSTALL for more detailed information. The file `configure.ac' is the input used by the autoconf program to construct the `configure' script. Since Emacs has some configuration requirements that autoconf can't meet directly, and for historical reasons, `configure.ac' uses an unholy marriage of custom-baked configuration code and autoconf macros. The shell script `autogen.sh' generates 'configure' and other files by running the GNU build tools autoconf and automake, which in turn use GNU m4 and Perl. If you want to use it, you will need to install recent versions of these build tools. This should be needed only if you edit files like `configure.ac' that specify Emacs's autobuild procedure. The file `Makefile.in' is a template used by `configure' to create `Makefile'. The file `make-dist' is a shell script to build a distribution tar file from the current Emacs tree, containing only those files appropriate for distribution. If you make extensive changes to Emacs, this script will help you distribute your version to others. There are several subdirectories: `src' holds the C code for Emacs (the Emacs Lisp interpreter and its primitives, the redisplay code, and some basic editing functions). `lisp' holds the Emacs Lisp code for Emacs (most everything else). `leim' holds the library of Emacs input methods, Lisp code and auxiliary data files required to type international characters which can't be directly produced by your keyboard. `lib' holds source code for libraries used by Emacs and its utilities `lib-src' holds the source code for some utility programs for use by or with Emacs, like movemail and etags. `etc' holds miscellaneous architecture-independent data files Emacs uses, like the tutorial text and tool bar images. The contents of the `lisp', `leim', `info', and `doc' subdirectories are architecture-independent too. `info' holds the Info documentation tree for Emacs. `doc/emacs' holds the source code for the Emacs Manual. If you modify the manual sources, you will need the `makeinfo' program to produce an updated manual. `makeinfo' is part of the GNU Texinfo package; you need a suitably recent version of Texinfo. `doc/lispref' holds the source code for the Emacs Lisp reference manual. `doc/lispintro' holds the source code for the Introduction to Programming in Emacs Lisp manual. `msdos' holds configuration files for compiling Emacs under MSDOG. `nextstep' holds instructions and some other files for compiling the Nextstep port of Emacs, for GNUstep and Mac OS X Cocoa. `nt' holds various command files and documentation files that pertain to building and running Emacs on Windows 9X/ME/NT/2000/XP. `test' holds tests for various aspects of Emacs's functionality. Building Emacs on non-Posix platforms requires tools that aren't part of the standard distribution of the OS. The platform-specific README files and installation instructions should list the required tools. NOTE ON COPYRIGHT YEARS In copyright notices where the copyright holder is the Free Software Foundation, then where a range of years appears, this is an inclusive range that applies to every year in the range. For example: 2005-2008 represents the years 2005, 2006, 2007, and 2008. This file is part of GNU Emacs. GNU Emacs is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. GNU Emacs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.