Linux下XWindow系统启动脚本分析 - Chinaunix

1、修改/etc/X11/xinit/xinitrc
2、修改/etc/X11/Xsession
3、在/etc/X11/Xsession.d目录下增加一个自定义的脚本
4、修改$HOME/.xsession
5、修改$HOME/.xinitrc
6、修改/etc/X11/xdm/Xsession
……

#!/bin/sh
#
# /etc/X11/Xsession
#
# global Xsession file -- used by display managers and xinit (startx)

# $Id: Xsession 2186 2005-02-11 07:11:05Z branden $

set -e

PROGNAME=Xsession

message () {
  # pretty-print messages of arbitrary length; use xmessage if it
  # is available and $DISPLAY is set
  MESSAGE="$PROGNAME: $*"
  echo "$MESSAGE" | fold -s -w ${COLUMNS:-80} >&2
  if [ -n "$DISPLAY" ] && which xmessage > /dev/null 2>&1; then
echo "$MESSAGE" | fold -s -w ${COLUMNS:-80} | xmessage -center -file -
  fi
}

message_nonl () {
  # pretty-print messages of arbitrary length (no trailing newline); use
  # xmessage if it is available and $DISPLAY is set
  MESSAGE="$PROGNAME: $*"
  echo -n "$MESSAGE" | fold -s -w ${COLUMNS:-80} >&2;
  if [ -n "$DISPLAY" ] && which xmessage > /dev/null 2>&1; then
echo -n "$MESSAGE" | fold -s -w ${COLUMNS:-80} | xmessage -center -file -
  fi
}

errormsg () {
  # exit script with error
  message "$*"
  exit 1
}

internal_errormsg () {
  # exit script with error; essentially a "THIS SHOULD NEVER HAPPEN" message
  # One big call to message() for the sake of xmessage; if we had two then
  # the user would have dismissed the error we want reported before seeing the
  # request to report it.
  errormsg "$*" \
         "Please report the installed version of the \"xfree86-common\"" \
         "package and the complete text of this error message to" \
         "<debian-x@lists.debian.org>."
}

# initialize variables for use by all session scripts

OPTIONFILE=/etc/X11/Xsession.options

SYSRESOURCES=/etc/X11/Xresources
USRRESOURCES=$HOME/.Xresources

SYSSESSIONDIR=/etc/X11/Xsession.d
USERXSESSION=$HOME/.xsession
ALTUSERXSESSION=$HOME/.Xsession
ERRFILE=$HOME/.xsession-errors

# attempt to create an error file; abort if we cannot
if touch "$ERRFILE" 2> /dev/null && [ -w "$ERRFILE" ] &&
  [ ! -L "$ERRFILE" ]; then
  chmod 600 "$ERRFILE"
elif ERRFILE=$(tempfile 2> /dev/null); then
  if ! ln -sf "$ERRFILE" "${TMPDIR:=/tmp}/xsession-$USER"; then
message "warning: unable to symlink \"$TMPDIR/xsession-$USER\" to" \
         "\"$ERRFILE\"; look for session log/errors in" \
         "\"$TMPDIR/xsession-$USER\"."
  fi
else
  errormsg "unable to create X session log/error file; aborting."
fi

exec >>"$ERRFILE" 2>&1

echo "$PROGNAME: X session started for $LOGNAME at $(date)"

# sanity check; is our session script directory present?
if [ ! -d "$SYSSESSIONDIR" ]; then
  errormsg "no \"$SYSSESSIONDIR\" directory found; aborting."
fi

# Attempt to create a file of non-zero length in /tmp; a full filesystem can
# cause mysterious X session failures.  We do not use touch, :, or test -w
# because they won't actually create a file with contents.  We also let standard
# error from tempfile and echo go to the error file to aid the user in
# determining what went wrong.
WRITE_TEST=$(tempfile)
if ! echo "*" >>"$WRITE_TEST"; then
  message "warning: unable to write to ${WRITE_TEST%/*}; X session may exit" \
      "with an error"
fi
rm -f "$WRITE_TEST"

# Use run-parts to source every file in the session directory; we source
# instead of executing so that the variables and functions defined above
# are available to the scripts, and so that they can pass variables to each
# other.
SESSIONFILES=$(run-parts --list $SYSSESSIONDIR)
if [ -n "$SESSIONFILES" ]; then
  for SESSIONFILE in $SESSIONFILES; do
. $SESSIONFILE
  done
fi

exit 0

SESSIONFILES=$(run-parts --list $SYSSESSIONDIR)
if [ -n "$SESSIONFILES" ]; then
for SESSIONFILE in $SESSIONFILES; do
. $SESSIONFILE
done
fi

USERXSESSION=$HOME/.xsession
ALTUSERXSESSION=$HOME/.Xsession

# $Id: 50xfree86-common_determine-startup 1437 2004-05-23 03:18:32Z branden $

# This file is sourced by Xsession(5), not executed.

# If no X session startup program was passed to the Xsession script as an
# argument (e.g., by the display manager), or if that program was not
# executable, fall back to looking for a user's custom X session script, if
# allowed by the options file.
if [ -z "$STARTUP" ]; then
  if grep -qs ^allow-user-xsession "$OPTIONFILE"; then
for STARTUPFILE in "$USERXSESSION" "$ALTUSERXSESSION"; do
   if [ -e "$STARTUPFILE" ]; then
      if [ -x "$STARTUPFILE" ]; then
      STARTUP="$STARTUPFILE"
      else
      STARTUP="sh $STARTUPFILE"
      fi
      break
   fi
done
  fi
fi

# If there is still nothing to use for a startup program, try the system
# default session manager, window manager, and terminal emulator.
if [ -z "$STARTUP" ]; then
  if [ -x /usr/bin/x-session-manager ]; then
STARTUP=x-session-manager
  elif [ -x /usr/bin/x-window-manager ]; then
STARTUP=x-window-manager
  elif [ -x /usr/bin/x-terminal-emulator ]; then
STARTUP=x-terminal-emulator
  fi
fi

# If we still have not found a startup program, give up.
if [ -z "$STARTUP" ]; then
  ERRMSG="unable to start X session ---"
  if grep -qs ^allow-user-xsession "$OPTIONFILE"; then
ERRMSG="$ERRMSG no \"$USERXSESSION\" file, no \"$ALTUSERXSESSION\" file,"
  fi
  errormsg "$ERRMSG no session managers, no window managers, and no terminal" \
         "emulators found; aborting."
fi

# vim:set ai et sts=2 sw=2 tw=80:

for STARTUPFILE in "$USERXSESSION" "$ALTUSERXSESSION"; do
   if [ -e "$STARTUPFILE" ]; then
      if [ -x "$STARTUPFILE" ]; then
      STARTUP="$STARTUPFILE"
      else
      STARTUP="sh $STARTUPFILE"
      fi
      break
   fi
done

##!/bin/sh
## $Xorg: xinitrc.cpp,v 1.3 2000/08/17 19:54:30 cpqbld Exp $
#
## /etc/X11/xinit/xinitrc
##
## global xinitrc file, used by all X sessions started by xinit (startx)
#
## invoke global X session script

. /etc/X11/Xsession

#!/bin/sh
#
# $Xorg: Xsession,v 1.4 2000/08/17 19:54:17 cpqbld Exp $
#
#
#
#
# $XFree86: xc/programs/xdm/config/Xsession,v 1.3 2001/01/17 23:45:24 dawes Exp $

# invoke global X session script

. /etc/X11/Xsession

X          Xsession.d       cursors                gdm       rstart    xinit
XF86Config-4  Xsession.options  default-display-manager  lbxproxy sysconfig  xkb
Xresources Xwrapper.config fonts                   proxymngr  twm       xserver
Xsession    app-defaults    fs                      rgb.txt xdm       xsm

export LC_CTYPE=zh_CN.GBK
export XMODIFIERS="@im=fcitx"
export XIM=fcitx
export XIM_PROGRAM=fcitx
fcitx

1、加到/etc/X11/Xsession。这种方法对所有启动方法都管理
2、在/etc/X11/Xsession.d目录里自己写一个脚本。这种方法也对所有启动方法都管理
3、在$HOME目录下生成.xsession或.Xsession脚本。这种方法也对当前登录用户有效
4、加到/etc/X11/xinit/xinitrc脚本里。这个方法只对xinit方式（即命令行输入startx）管用。
5、加到/etc/X11/xdm/xsession脚本里，只对用xdm管理界面登录的方式管用。