GNU bug report logs - #19191
24.4; su command in *shell* buffer does not work

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: 白井彰 <okshirai <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Cc: Akira Shirai <okshirai <at> gmail.com>
Subject: 24.4; su command in *shell* buffer does not work
Date: Wed, 26 Nov 2014 19:00:48 +0900

su command in *shell* buffer does not work.
su does not ask for the password and exits with "su: Sorry".

/* *shell* buffer (24.4) */
Warning: no access to tty; thus no job control in this shell...
yokohama% su
su: Sorry
yokohama%

su in *shell* buffer works well on emacs-24.3.

/* *shell* buffer (24.3) */
yokohama% su
Password: 
# exit
yokohama% 


In GNU Emacs 24.4.1 (i386-pc-solaris2.10, X toolkit, Xaw scroll bars)
 of 2014-10-23 on yokohama
Windowing system distributor `Sun Microsystems, Inc.', version 11.0.6410
Configured using:
 `configure --prefix=/Users/shiraiakira/i386/emacs-24.4 --with-x
 --x-includes=/usr/dt/include:/usr/openwin/include:/Users/shiraiakira/xpm/i386/include:/Users/shiraiakira/i386/jpeg/include:/Users/shiraiakira/i386/zlib/include:/Users/shiraiakira/i386/libpng/include:/Users/shiraiakira/i386/libungif/include:/Users/shiraiakira/i386/tiff/libtiff
 --x-libraries=/usr/dt/lib:/usr/openwin/lib:/Users/shiraiakira/xpm/i386/lib:/Users/shiraiakira/i386/jpeg/lib:/Users/shiraiakira/i386/zlib/lib:/Users/shiraiakira/i386/libpng/lib:/Users/shiraiakira/i386/libungif/lib:/Users/shiraiakira/i386/tiff/libtiff
 --without-compress-install'

Important settings:
  value of $LANG: C
  locale-coding-system: nil

Major mode: Shell

Minor modes in effect:
  shell-dirtrack-mode: t
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x s h e l l <return> s u <return> M-x r e p o r t 
<return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
easymenu mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util help-fns mail-prsvr mail-utils shell pcomplete comint ansi-color
ring time-date tooltip electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment lisp-mode prog-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer nadvice
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process dynamic-setting
x-toolkit x multi-tty emacs)

Memory information:
((conses 8 77649 4073)
 (symbols 24 17821 0)
 (miscs 20 43 185)
 (strings 16 13260 3813)
 (string-bytes 1 362635)
 (vectors 8 9635)
 (vector-slots 4 388469 2228)
 (floats 8 61 197)
 (intervals 28 976 1434)
 (buffers 512 12))

Message #8 received at 19191 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: 白井彰 <okshirai <at> gmail.com>
Cc: 19191 <at> debbugs.gnu.org
Subject: Re: bug#19191: 24.4; su command in *shell* buffer does not work
Date: Wed, 26 Nov 2014 12:13:52 +0100

白井彰 <okshirai <at> gmail.com> writes:

> /* *shell* buffer (24.4) */
> Warning: no access to tty; thus no job control in this shell...

This is likely your problem.  What do you get if you execute this
command in this shell:

ls -l $(tty)

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Message #11 received at 19191 <at> debbugs.gnu.org (full text, mbox):

From: 白井彰 <okshirai <at> gmail.com>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: Akira Shirai <okshirai <at> gmail.com>, 19191 <at> debbugs.gnu.org
Subject: Re: bug#19191: 24.4; su command in *shell* buffer does not work
Date: Fri, 28 Nov 2014 01:33:08 +0900

echo $(tty) says:

not a tty      /* 24.4 */
/dev/pts/15    /* 24.3 */


/* 24.4 */
oomiya% telnet yokohama
yokohama% setenv DISPLAY oomiya:0.0
yokohama% i386/emacs-24.4/bin/emacs &
M-x shell
/* *shell* buffer (24.4) */
yokohama% ls -l $(tty)
not: No such file or directory
a: No such file or directory
tty: No such file or directory
yokohama% echo $(tty)
not a tty
yokohama% who am i
Must be attached to terminal for 'am I' option
yokohama% w
  9:26am  up 115 day(s), 32 min(s),  8 users,  load average: 3.02, 3.04, 3.06
User     tty           login@  idle   JCPU   PCPU  what
shirai   pts/17        9:13am    13     38     38  w
yokohama% ps -ef | grep emacs
  shirai  3308  3285   0 09:14:19 pts/17      0:39 i386/emacs-24.4/bin/emacs
  shirai  3178     1   0 09:11:12 ?           0:15 i386/emacs-24.3/src/emacs
  shirai  3670  3410   0 09:27:19 ?           0:00 grep emacs
yokohama% ptree 3308
360   /usr/lib/inet/inetd start
  3259  /usr/sbin/in.telnetd
    3262  -csh
      3285  csh
        3308  i386/emacs-24.4/bin/emacs
          3410  /bin/zsh -i
            3672  ptree 3308
yokohama% ps -efl | sort | nawk '{if ($4 ~ /360|3259|3262|3285|3308|3410|3672/) {print $0}}'
 0 S     root   360     1   0  40 20        ?   2183        ?   Aug 04 ?           0:49 /usr/lib/inet/inetd start
 0 S     root  3259   360   0  40 20        ?    936        ? 09:13:52 ?           0:00 /usr/sbin/in.telnetd
 0 S   shirai  3262  3259   0  40 20        ?   1140        ? 09:13:52 pts/17      0:00 -csh
 0 S   shirai  3285  3262   0  40 20        ?    597        ? 09:14:05 pts/17      0:00 csh
 0 O   shirai  3308  3285   0  40 20        ?  18970          09:14:19 pts/17      0:39 i386/emacs-24.4/bin/emacs
 0 S   shirai  3410  3308   0  70 20        ?    927        ? 09:17:45 ?           0:00 /bin/zsh -i
yokohama% tail -1 /var/adm/messages
Nov 27 11:59:20 yokohama su: [ID 810491 auth.crit] 'su root' failed for shirai on /dev/???

/* 24.3 */
oomiya% telnet yokohama
yokohama% setenv DISPLAY oomiya:0.0
yokohama% i386/emacs-24.3/src/emacs &
M-x shell
/* *shell* buffer (24.3) */
yokohama% ls -l $(tty)
lrwxrwxrwx   1 root     root          29 Jul 26  2012 /dev/pts/15 -> ../../devices/pseudo/pts <at> 0:15
yokohama% echo $(tty)
/dev/pts/15
yokohama% who am i
shirai     /dev/pts/15  Nov 27 09:29
yokohama% w
  9:29am  up 115 day(s), 35 min(s),  8 users,  load average: 3.02, 3.03, 3.05
User     tty           login@  idle   JCPU   PCPU  what
shirai   pts/9        Tue 6pm 31:30  49:47         csh
yokohama% ps -ef | grep emacs
  shirai  3308  3285   0 09:14:19 pts/17      0:39 i386/emacs-24.4/bin/emacs
  shirai  3178     1   0 09:11:12 ?           0:15 i386/emacs-24.3/src/emacs
  shirai  3727  3198   0 09:30:12 pts/15      0:00 grep emacs
yokohama% ptree 3178
3178  i386/emacs-24.3/src/emacs
  3198  /bin/zsh -i
    3740  ptree 3178
yokohama% ps -efl | sort | nawk '{if ($4 ~ /3178|3198|3740/) {print $0}}'
 0 O   shirai  3178     1   0  40 20        ?  19270          09:11:12 ?           0:15 i386/emacs-24.3/src/emacs
 0 S   shirai  3198  3178   0  70 20        ?    927        ? 09:11:35 pts/15      0:00 /bin/zsh -i

Message #14 received at 19191 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: 白井彰 <okshirai <at> gmail.com>
Cc: 19191 <at> debbugs.gnu.org
Subject: Re: bug#19191: 24.4; su command in *shell* buffer does not work
Date: Thu, 27 Nov 2014 18:14:36 +0100

白井彰 <okshirai <at> gmail.com> writes:

> echo $(tty) says:
>
> not a tty      /* 24.4 */

That's your problem.  What is the value of the process-connection-type
variable?

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Message #17 received at 19191 <at> debbugs.gnu.org (full text, mbox):

From: 白井彰 <okshirai <at> gmail.com>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: Akira Shirai <okshirai <at> gmail.com>, 19191 <at> debbugs.gnu.org
Subject: Re: bug#19191: 24.4; su command in *shell* buffer does not work
Date: Fri, 28 Nov 2014 18:25:00 +0900

Its value is t

Message #20 received at 19191 <at> debbugs.gnu.org (full text, mbox):

From: 白井彰 <okshirai <at> gmail.com>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: Akira Shirai <okshirai <at> gmail.com>, 19191 <at> debbugs.gnu.org
Subject: Re: bug#19191: 24.4; su command in *shell* buffer does not work
Date: Sat, 6 Dec 2014 20:15:50 +0900

"su: Sorry" occurs on my Solaris 10 and Solaris 8 machine even when
emacs -Q and zsh without .zshenv, .zprofile, .zshrc, .zlogin, and
.zlogout, csh without .cshrc and .login.

Message #25 received at 19191 <at> debbugs.gnu.org (full text, mbox):

From: 白井彰 <okshirai <at> gmail.com>
To: 19191 <at> debbugs.gnu.org
Cc: Akira Shirai <okshirai <at> gmail.com>
Subject: Re: bug#19191: 24.4; su command in *shell* buffer does not work
Date: Tue, 17 Mar 2015 01:36:07 +0900

"su: Sorry" also occurs on Emacs 24.4.91.

Message #28 received at 19191 <at> debbugs.gnu.org (full text, mbox):

From: 白井彰 <okshirai <at> gmail.com>
To: 19191 <at> debbugs.gnu.org
Cc: Akira Shirai <okshirai <at> gmail.com>
Subject: Re: bug#19191: 24.4; su command in *shell* buffer does not work
Date: Tue, 31 Mar 2015 02:08:51 +0900

"su: Sorry" also occurs on emacs-24.5-rc1.

Message #31 received at 19191 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: 白井彰 <okshirai <at> gmail.com>
Cc: 19191 <at> debbugs.gnu.org
Subject: Re: bug#19191: 24.4; su command in *shell* buffer does not work
Date: Mon, 30 Mar 2015 20:22:24 +0300

> From: 白井彰 <okshirai <at> gmail.com>
> Date: Tue, 31 Mar 2015 02:08:51 +0900
> Cc: Akira Shirai <okshirai <at> gmail.com>
> 
> "su: Sorry" also occurs on emacs-24.5-rc1.

You need to find out why the shell's TTY is not a PTY device on your
system.  As Andreas pointed out, this is the reason for the problem.

Message #34 received at 19191 <at> debbugs.gnu.org (full text, mbox):

From: 白井彰 <okshirai <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Akira Shirai <okshirai <at> gmail.com>, 19191 <at> debbugs.gnu.org
Subject: Re: bug#19191: 24.4; su command in *shell* buffer does not work
Date: Wed, 1 Apr 2015 20:54:09 +0900

Today I tried to find out why the shell's TTY is not a PTY device on
my system.  I tried the following:

1. Remove my .cshrc and .login.

2. Logout and login, and launch a terminal emulator (dtterm)
   on X Window System in my Solaris 10 system (i386-pc-solaris2.10).

3. On the terminal emulator, I type the following:
   set path = (/usr/bin . /usr/ccs/bin)
   gzcat emacs-24.3.tar.gz | tar xfp -
   (cd emacs-24.3; ./configure --with-jpeg=no --with-gif=no; make)
   (cd emacs-24.3/src; ./emacs -Q)
   M-x shell
   % su
   Password: ********
   #
   => su command in *shell* buffer works well.
   C-x C-c

4. Then I type the following on the same terminal emulator:
   gzcat emacs-24.4.tar.gz | tar xfp -
   (cd emacs-24.4; ./configure --with-jpeg=no --with-gif=no; make)
   (cd emacs-24.4/src; ./emacs -Q)
   M-x shell
   Warning: no access to tty; thus no job control in this shell...
   % su
   su: Sorry
   %
   => su command in *shell* buffer does not work.
      su does not ask for the password and exits with "su: Sorry".

I would like to know how I can proceed.
Thanks.

> 2015/03/31 2:22、Eli Zaretskii <eliz <at> gnu.org> のメール：
> 
>> From: 白井彰 <okshirai <at> gmail.com>
>> Date: Tue, 31 Mar 2015 02:08:51 +0900
>> Cc: Akira Shirai <okshirai <at> gmail.com>
>> 
>> "su: Sorry" also occurs on emacs-24.5-rc1.
> 
> You need to find out why the shell's TTY is not a PTY device on your
> system.  As Andreas pointed out, this is the reason for the problem.

Message #37 received at 19191 <at> debbugs.gnu.org (full text, mbox):

From: Wolfgang Jenkner <wjenkner <at> inode.at>
To: 白井彰 <okshirai <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 19191 <at> debbugs.gnu.org
Subject: Re: bug#19191: 24.4; su command in *shell* buffer does not work
Date: Wed, 01 Apr 2015 15:49:59 +0200

On Wed, Apr 01 2015, 白井彰 wrote:

>    (cd emacs-24.3; ./configure --with-jpeg=no --with-gif=no; make)
[...]
>    (cd emacs-24.4; ./configure --with-jpeg=no --with-gif=no; make)

Perhaps the output of the following two commands shows significant
differences?

grep '#.*PTY' emacs-24.3/src/config.h
grep '#.*PTY' emacs-24.4/src/config.h

Message #40 received at 19191 <at> debbugs.gnu.org (full text, mbox):

From: 白井彰 <okshirai <at> gmail.com>
To: Wolfgang Jenkner <wjenkner <at> inode.at>
Cc: Akira Shirai <okshirai <at> gmail.com>, Eli Zaretskii <eliz <at> gnu.org>,
 19191 <at> debbugs.gnu.org
Subject: Re: bug#19191: 24.4; su command in *shell* buffer does not work
Date: Fri, 3 Apr 2015 01:56:57 +0900

[Message part 1 (text/plain, inline)]

Today I tried what you had suggested, but I could not find significant
differences.

% grep '#.*PTY' emacs-24.3/src/config.h > /tmp/config.h_PTY_emacs-24.3
% grep '#.*PTY' emacs-24.4/src/config.h > /tmp/config.h_PTY_emacs-24.4

% cat /tmp/config.h_PTY_emacs-24.3
/* #undef BROKEN_PTY_READ_AFTER_EAGAIN */
/* #undef DONT_REOPEN_PTY */
#define FIRST_PTY_LETTER 'z'
#define HAVE_PTYS 1
/* #undef HAVE_PTY_H */
/* #undef PTY_ITERATION */
#define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
/* #undef PTY_OPEN */
#define PTY_TTY_NAME_SPRINTF { char *ptsname (int), *ptyname; int grantpt_result; sigset_t blocked; sigemptyset (&blocked); sigaddset (&blocked, SIGCLD); pthread_sigmask (SIG_BLOCK, &blocked, 0); grantpt_result = grantpt (fd); pthread_sigmask (SIG_UNBLOCK, &blocked, 0); if (grantpt_result == -1 || unlockpt (fd) == -1 || !(ptyname = ptsname (fd))) { emacs_close (fd); return -1; } snprintf (pty_name, sizeof pty_name, "%s", ptyname); }
#define SETUP_SLAVE_PTY if (ioctl (xforkin, I_PUSH, "ptem") == -1) fatal ("ioctl I_PUSH ptem"); if (ioctl (xforkin, I_PUSH, "ldterm") == -1) fatal ("ioctl I_PUSH ldterm"); if (ioctl (xforkin, I_PUSH, "ttcompat") == -1) fatal ("ioctl I_PUSH ttcompat");
/* #undef UNIX98_PTYS */

% cat /tmp/config.h_PTY_emacs-24.4
/* #undef BROKEN_PTY_READ_AFTER_EAGAIN */
/* #undef DONT_REOPEN_PTY */
#define FIRST_PTY_LETTER 'z'
#define HAVE_PTYS 1
/* #undef HAVE_PTY_H */
/* #undef PTY_ITERATION */
#define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
/* #undef PTY_OPEN */
#define PTY_TTY_NAME_SPRINTF { char *ptsname (int), *ptyname; int grantpt_result; sigset_t blocked; sigemptyset (&blocked); sigaddset (&blocked, SIGCHLD); pthread_sigmask (SIG_BLOCK, &blocked, 0); grantpt_result = grantpt (fd); pthread_sigmask (SIG_UNBLOCK, &blocked, 0); if (grantpt_result == -1 || unlockpt (fd) == -1 || !(ptyname = ptsname (fd))) { emacs_close (fd); return -1; } snprintf (pty_name, PTY_NAME_SIZE, "%s", ptyname); }
#define SETUP_SLAVE_PTY if (ioctl (xforkin, I_PUSH, "ptem") == -1) fatal ("ioctl I_PUSH ptem"); if (ioctl (xforkin, I_PUSH, "ldterm") == -1) fatal ("ioctl I_PUSH ldterm"); if (ioctl (xforkin, I_PUSH, "ttcompat") == -1) fatal ("ioctl I_PUSH ttcompat");
/* #undef UNIX98_PTYS */

% diff /tmp/config.h_PTY_emacs-24.3 /tmp/config.h_PTY_emacs-24.4
9c9
< #define PTY_TTY_NAME_SPRINTF { char *ptsname (int), *ptyname; int grantpt_result; sigset_t blocked; sigemptyset (&blocked); sigaddset (&blocked, SIGCLD); pthread_sigmask (SIG_BLOCK, &blocked, 0); grantpt_result = grantpt (fd); pthread_sigmask (SIG_UNBLOCK, &blocked, 0); if (grantpt_result == -1 || unlockpt (fd) == -1 || !(ptyname = ptsname (fd))) { emacs_close (fd); return -1; } snprintf (pty_name, sizeof pty_name, "%s", ptyname); }
---
> #define PTY_TTY_NAME_SPRINTF { char *ptsname (int), *ptyname; int grantpt_result; sigset_t blocked; sigemptyset (&blocked); sigaddset (&blocked, SIGCHLD); pthread_sigmask (SIG_BLOCK, &blocked, 0); grantpt_result = grantpt (fd); pthread_sigmask (SIG_UNBLOCK, &blocked, 0); if (grantpt_result == -1 || unlockpt (fd) == -1 || !(ptyname = ptsname (fd))) { emacs_close (fd); return -1; } snprintf (pty_name, PTY_NAME_SIZE, "%s", ptyname); }

% cat /tmp/config.h_PTY_emacs-24.3 | grep PTY_TTY_NAME_SPRINTF | sed 's/#define//' | indent -st > /tmp/config.h_PTY_emacs-24.3_indent-st
% cat /tmp/config.h_PTY_emacs-24.4 | grep PTY_TTY_NAME_SPRINTF | sed 's/#define//' | indent -st > /tmp/config.h_PTY_emacs-24.4_indent-st
% diff /tmp/config.h_PTY_emacs-24.3_indent-st /tmp/config.h_PTY_emacs-24.4_indent-st
6c6
<       sigaddset(&blocked, SIGCLD);
---
>       sigaddset(&blocked, SIGCHLD);
13c13
<       } snprintf(pty_name, sizeof pty_name, "%s", ptyname);
---
>       } snprintf(pty_name, PTY_NAME_SIZE, "%s", ptyname);

And I replaced the definition of PTY_TTY_NAME_SPRINTF in
emacs-24.4/src/config.h with the definition of PTY_TTY_NAME_SPRINTF in
emacs-24.3/src/config.h and typed "make" and "emacs -Q", the emacs
(almost emacs-24.4 except PTY_TTY_NAME_SPRINTF) still said "Warning:
no access to tty; thus no job control in this shell...".

> 2015/04/01 22:49、Wolfgang Jenkner <wjenkner <at> inode.at> のメール：
> 
> 

[Message part 2 (text/html, inline)]

Message #43 received at 19191 <at> debbugs.gnu.org (full text, mbox):

From: 白井彰 <okshirai <at> gmail.com>
To: 19191 <at> debbugs.gnu.org
Cc: Akira Shirai <okshirai <at> gmail.com>
Subject: Re: bug#19191: 24.4; su command in *shell* buffer does not work
Date: Tue, 14 Apr 2015 01:43:30 +0900

"su: Sorry" also occurs on Emacs 24.5.

% gzcat emacs-24.3.tar.gz | tar xfp -
% (cd emacs-24.3; ./configure --with-jpeg=no --with-gif=no; make)

% gzcat emacs-24.5.tar.gz | tar xfp -
% (cd emacs-24.5; ./configure --with-jpeg=no --with-gif=no; make)

% grep '#.*PTY' emacs-24.3/src/config.h > /tmp/config.h_PTY_emacs-24.3
% grep '#.*PTY' emacs-24.5/src/config.h > /tmp/config.h_PTY_emacs-24.5

% diff /tmp/config.h_PTY_emacs-24.3 /tmp/config.h_PTY_emacs-24.5
9c9
< #define PTY_TTY_NAME_SPRINTF { char *ptsname (int), *ptyname; int grantpt_result; sigset_t blocked; sigemptyset (&blocked); sigaddset (&blocked, SIGCLD); pthread_sigmask (SIG_BLOCK, &blocked, 0); grantpt_result = grantpt (fd); pthread_sigmask (SIG_UNBLOCK, &blocked, 0); if (grantpt_result == -1 || unlockpt (fd) == -1 || !(ptyname = ptsname (fd))) { emacs_close (fd); return -1; } snprintf (pty_name, sizeof pty_name, "%s", ptyname); }
---
> #define PTY_TTY_NAME_SPRINTF { char *ptsname (int), *ptyname; int grantpt_result; sigset_t blocked; sigemptyset (&blocked); sigaddset (&blocked, SIGCHLD); pthread_sigmask (SIG_BLOCK, &blocked, 0); grantpt_result = grantpt (fd); pthread_sigmask (SIG_UNBLOCK, &blocked, 0); if (grantpt_result == -1 || unlockpt (fd) == -1 || !(ptyname = ptsname (fd))) { emacs_close (fd); return -1; } snprintf (pty_name, PTY_NAME_SIZE, "%s", ptyname); }

% cat /tmp/config.h_PTY_emacs-24.3 | grep PTY_TTY_NAME_SPRINTF | sed 's/#define//' | indent -st > /tmp/config.h_PTY_emacs-24.3_indent-st
% cat /tmp/config.h_PTY_emacs-24.5 | grep PTY_TTY_NAME_SPRINTF | sed 's/#define//' | indent -st > /tmp/config.h_PTY_emacs-24.5_indent-st
% diff /tmp/config.h_PTY_emacs-24.3_indent-st /tmp/config.h_PTY_emacs-24.5_indent-st
6c6
<       sigaddset(&blocked, SIGCLD);
---
>       sigaddset(&blocked, SIGCHLD);
13c13
<       } snprintf(pty_name, sizeof pty_name, "%s", ptyname);
---
>       } snprintf(pty_name, PTY_NAME_SIZE, "%s", ptyname);

% (cd emacs-24.5/src; ./emacs -Q)
M-x shell
Warning: no access to tty; thus no job control in this shell...
% su
su: Sorry
%
=> su command in *shell* buffer does not work.
   su does not ask for the password and exits with "su: Sorry".

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Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.