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"^D^H^H" in process output on Darwin (Was Re: grep-use-null-device)
From: |
YAMAMOTO Mitsuharu |
Subject: |
"^D^H^H" in process output on Darwin (Was Re: grep-use-null-device) |
Date: |
Sat, 27 Aug 2005 10:30:41 +0900 |
User-agent: |
Wanderlust/2.14.0 (Africa) SEMI/1.14.6 (Maruoka) FLIM/1.14.6 (Marutamachi) APEL/10.6 Emacs/22.0.50 (sparc-sun-solaris2.8) MULE/5.0 (SAKAKI) |
>>>>> On Sat, 20 Aug 2005 15:22:41 +0300, Eli Zaretskii <address@hidden> said:
>> Thanks for posting the URL, though it seems that the web interface
>> at lists.gnu.org eats multiple spaces. Here is the Gmane URL for
>> the original post from Kevin Rodgers with correct indentation:
>>
>> http://article.gmane.org/gmane.emacs.devel/33146
>>
>> Can someone please install it?
> Done.
With this change, we sometimes see "^D^H^H" at the head of the output
of grep on Darwin/Mac OS X with whichever window systems (^H is
actually in one character). It looks as if the tty echo option is not
disabled and ^D is echoed back in response to process-send-eof.
I think this is because Emacs may send some data before a subprocess
completes tty options setup. On Darwin, vfork is defined as fork for
the reason mentioned in src/s/darwin.h.
/* The following solves the problem that Emacs hangs when evaluating
(make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
does not exist. */
#undef HAVE_WORKING_VFORK
#define vfork fork
#define DONT_REOPEN_PTY
(It actually hangs on Mac OS X 10.1.5 and 10.2.8 if
process-connection-type is set to t. On Mac OS X 10.3.9 it seems not
to hang. Are there any other problems with vfork on Mac OS X 10.3,
which is based on Darwin 7?)
Unlike vfork, the parent process may run before the child process
executes the code between (v)fork and execve/_exit if fork is used.
The current Emacs disables the tty echo option in the child process
(for USG systems?) by calling child_setup_tty.
The following patch does tty options setup before forking, and it
works for me.
YAMAMOTO Mitsuharu
address@hidden
Index: src/process.c
===================================================================
RCS file: /cvsroot/emacs/emacs/src/process.c,v
retrieving revision 1.463
diff -c -r1.463 process.c
*** src/process.c 15 Aug 2005 08:44:53 -0000 1.463
--- src/process.c 27 Aug 2005 01:25:30 -0000
***************
*** 1793,1798 ****
--- 1793,1802 ----
#endif
if (forkin < 0)
report_file_error ("Opening pty", Qnil);
+ /* In the case that vfork is defined as fork, the parent process
+ (Emacs) may send some data before the child process completes
+ tty options setup. So we setup tty before forking. */
+ child_setup_tty (forkout);
#else
forkin = forkout = -1;
#endif /* not USG, or USG_SUBTTY_WORKS */
- grep-use-null-device, Emilio Lopes, 2005/08/15
- Re: grep-use-null-device, Richard M. Stallman, 2005/08/15
- Re: grep-use-null-device, Karl Chen, 2005/08/16
- Re: grep-use-null-device, Juri Linkov, 2005/08/29
- Re: grep-use-null-device, Richard M. Stallman, 2005/08/30
- Re: grep-use-null-device, Stefan Monnier, 2005/08/30
- Re: grep-use-null-device, Juri Linkov, 2005/08/31
Re: grep-use-null-device, Emilio Lopes, 2005/08/16