Date: Sun, 23 Jul 2000 00:36:09 -0400 (EDT) From: Trevor Johnson <trevor@jpj.net> To: The Hermit Hacker <scrappy@hub.org> Cc: kde-devel@max.tat.physik.uni-tuebingen.de, freebsd-ports@FreeBSD.ORG, Ronald Kuehn <kuehn@rz.tu-clausthal.de> Subject: Re: KDE2 and konsole_grantpty (Was: Re: More on Session hangs ... ) Message-ID: <Pine.BSI.4.21.0007222323360.25361-100000@blues.jpj.net> In-Reply-To: <Pine.BSF.4.21.0007222104580.325-100000@thelab.hub.org>
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> okay, this might make sense to someone out there ... looking at
> konsole_grantpty, the fod that is failing appears to be:
>
> pty = ttyname(PTY_FILENO); /* posix */
> if (pty == NULL)
> {
> fprintf(stderr,"%s: cannot determine the name of device.\n",argv[0]);
> return 1; /* FAIL */
> }
> close(PTY_FILENO);
>
> where PTY_FILENO is hardcoded as 3:
>
> #define PTY_FILENO 3 /* keep in sync with grantpty */
>
> What does the 3 signify? Is this something specific to Linux that needs
> to be set to a different value for *BSD (and, apparently, UnixWare7)?
I searched the Web for "PTY_FILENO" and found
http://www.draper.net/glibc-2.1/S/login%20programs%20pt_chown.c.html .
It's a daemon that comes with the GNU C library that seems to do the same
thing that konsole_grantpty is for. PTY_FILENO is defined in the
accompanying pty-private.h
(http://www.draper.net/glibc-2.1/S/login%20pty-private.h.html) which says:
27 /* The file descriptor connected to the master pseudo terminal. */
28 #define PTY_FILENO 3
At
http://www.securiteam.com/unixfocus/Emacs_found_to_contain_several_security_vulnerabilities__eavesdrop__tmp__password_.html
I read:
For FreeBSD, an enhancement to openpty() has been proposed which
sets proper permissions on the slave TTY device (see problem
report bin/9770). The proposal has yet to be adopted, though.
I added Ronald Kuehn, who submitted the PR, to the CC line. I only took a
cursory look at his program, but it seems to serve a similar function to
konsole_grantpty or pt_chown, except that he wrote it especially for
FreeBSD. I guess most of the Linux folks can use UNIX 98 ptys
(http://www.unix-systems.org/single_unix_specification_v2/xsh/grantpt.html)
now, and don't need such daemons.
--
Trevor Johnson
http://jpj.net/~trevor/gpgkey.txt
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