Subversion Repositories or1k

# tty.tcl - xterm as tty for the inferior

# Copyright (C) 1996, 2000 Red Hat, Inc

# Written by Tom Tromey <tromey@cygnus.com>

#

# Interface to the inferior's terminal.  This is very rough, and is

# guaranteed to only work on Unix machines (if even there).

#

namespace eval tty {

  namespace export create

  variable _xterm_fd {}

  proc create {} {

    variable _xterm_fd

    destroy

    # Tricky: we exec /bin/cat so that the xterm will exit whenever we

    # close the write end of the pipe.  Note that the stdin

    # redirection must come after tty is run; tty looks at its stdin.

    set shcmd {/bin/sh -c 'exec 1>&7; tty; exec /bin/cat 0<&6'}

    set fg [option get . foreground Foreground]

    if {$fg == ""} then {

      set fg black

    }

    set bg [. cget -background]

    if {$bg == ""} then {

      set bg [lindex [. configure -background] 3]

    }

    set xterm [list /bin/sh -c "exec xterm -T 'Gdb Child' -n Gdb -bg '$bg' -fg '$fg' -e $shcmd 6<&0 7>&1"]

    # Need both read and write access to xterm process.

    set _xterm_fd [open "| $xterm" w+]

    set tty [gets $_xterm_fd]

    # On failure we don't try the tty command.

    if {$tty != ""} {

      gdb_cmd "tty $tty"

    }

  }

  proc destroy {} {

    variable _xterm_fd

    if {$_xterm_fd != ""} then {

      # We don't care if this fails.

      catch {close $_xterm_fd}

    }

    set _xterm_fd {}

  }

}