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Reading from a FIFO with insert-file-contents doesn't work.


From: Krzysztof Luks
Subject: Reading from a FIFO with insert-file-contents doesn't work.
Date: 25 Nov 2001 23:07:03 +0100
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.1

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In GNU Emacs 21.1.1 (i386-debian-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2001-11-13 on raven, modified by Debian
configured using `configure  i386-debian-linux-gnu --prefix=/usr 
--sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib 
--infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes --with-x=yes 
--with-x-toolkit=athena --without-gif'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: C
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: C
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: pl_PL
  locale-coding-system: iso-latin-2
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Inserting contents of a fifo with either insert-file-contents or
insert-file-contents-literally fails. I created simple C program that
creates fifo '/tmp/test-fifo' writes string "Hello world\n" to that
file, closes it, sleeps 10 seconds and unlinks the fifo and exits.

---------------------------
#include <stdio.h>

#define FIFO "/tmp/test-fifo"

int main(void) {
    FILE *f;

    mkfifo(FIFO, 0666);
    f = fopen(FIFO, "w");
    fputs("Hello world\n", f);
    fclose(f);
    sleep(10);

    unlink(FIFO);
    return 0;
}
---------------------------

When I (while my test program is running) type into scratch buffer:
(insert-file-contents '/tmp/test-fifo')
and then type C-j Emacs just inserts one empty line and displays
'Quit' in the minibuffer.
Doing 'cat /tmp/test-fifo' in bash works as expected (i.e. produces
the line 'Hello world'.

Both insert-file-contents and insert-file-contents-literally also fail
with fifos created by other programs.

Recent input:
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <menu-bar> 
<help-menu> <report-emacs-bug>

Recent messages:
Loading 50c-sig (source)...done
Loading 50dpkg-dev (source)...done
Loading 50eieio (source)...done
Loading 50gettext (source)...done
Loading 50octave (source)...done
Loading 50python-mode (source)...done
Loading 50speedbar (source)...done
Loading 50yatex-init (source)...done
For information about the GNU Project and its goals, type C-h C-p.
Loading emacsbug...done

-- 
        --=(Krzysztof Luks)(m00se<at>iq.pl)=----=(mep.pl 0.0.6)=--
  You hit Root. Root hits you. Root sends you TERM signal. You barely
        survive. Root sends you KILL signal. You die. --more--



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