bug#2446: 23.0.90; C-g C-g in sending mail

I mistakenly sent a message from `emacs -Q', so `sendmail-send-it'
tried to run the sendmail program, and it hung.  I typed C-g and Emacs said
Waiting for process to die...(type C-g again to kill it instantly)
(which comes from call_process_cleanup).
However, typing C-g again had no effect, and Emacs remained hung
for a long time.  Eventually the process did die and Emacs un-hung.




In GNU Emacs 23.0.90.4 (mipsel-unknown-linux-gnu, GTK+ Version 2.12.11)
 of 2009-02-23 on lemote-yeeloong
configured using `configure  'CFLAGS=-O0 -g -Wno-pointer-sign' 'mipsel-unknown-linux-gnu' 'build_alias=mipsel-unknown-linux-gnu' 'host_alias=mipsel-unknown-linux-gnu' 'target_alias=mipsel-unknown-linux-gnu''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Mail

Minor modes in effect:
  gpm-mouse-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
b o l - n a m e SPC ' f o o SPC DEL ) SPC i n SPC E 
a c s DEL DEL DEL m a c s . ESC d SPC ESC c C-n C-n 
C-n ESC f SPC a t SPC t h e SPC n e t SPC l i n e ESC 
b C-b C-b x ESC q ESC f ESC f , C-a C-n C-n C-n C-o 
I f SPC I SPC t h e n SPC C-u C-p C-u C-p C-n C-e ESC 
DEL e v a l u a t e C-a C-n ESC C-k C-y C-u C-n C-n 
C-n e v a ESC / SPC C-y SPC a g a i j , DEL DEL n , 
C-a C-k C-k C-y C-k C-k C-x 1 ESC < C-u C-n C-n C-e 
SPC SPC T h i s SPC c o d e RET i s SPC f r o m SPC 
d a t a . c : DEL . SPC SPC I t SPC p r o b a b l y 
SPC h a s SPC n o t SPC c h a n g e d C-a ESC e C-k 
C-p ESC e C-o DEL , SPC f e t c h e d RET f r o m SPC 
s a v a n n a h SPC DEL . g n u . o g DEL r g SPC a 
t SPC 0 9 : 4 1 SPC E S T SPC o n SPC F e b SPC 2 2 
. C-d C-a C-u C-u C-n C-u C-n C-u C-n C-u C-g C-c C-c 
ESC x r e p o r t SPC e m a c s SPC b u g RET

Recent messages:
Auto-saving...done
Auto-saving...done
Auto-saving...done
Mark set [4 times]
Auto-saving...done
Quit
Sending...
Waiting for process to die...done
Quit
Auto-saving...