Simplify termio code.

All non-MSDOS non-WINDOWSNT platforms define HAVE_TERMIOS, so
HAVE_TERMIO code is obsolete.
Replace HAVE_TERMIOS conditionals with !DOS_NT.
* src/systty.h: Do not define HAVE_TCATTR.
Remove HAVE_TERMIO, HAVE_LTCHARS and HAVE_TCHARS code.
Do not define EMACS_HAVE_TTY_PGRP.  Only define
EMACS_GET_TTY_PGRP for !DOS_NT.
* src/sysdep.c: Include sysselect.h unconditionally.  Do not include
sys/ioctl.h and termios.h, systty.h does it.  Use
HAVE_SYS_UTSNAME_H instead of USG as an include guard.
(init_baud_rate): Remove HAVE_TERMIO code.
(child_setup_tty): Remove HAVE_TERMIO code.
(emacs_get_tty, emacs_set_tty): Remove HAVE_TERMIO, HAVE_TCHARS
and HAVE_LTCHARS code.  Use !DOS_NT instead of HAVE_TCATTR.
(new_ltchars, new_tchars): Remove, unused.
(init_sys_modes): Remove HAVE_TERMIO, HAVE_TCHARS and HAVE_LTCHARS
code.  Remove special casing for __mips__, it was a no-op.  Remove
HAVE_TCATTR conditional, it is implied by HAVE_TERMIOS.
(init_sys_modes): Remove HPUX special case.
* src/process.c: Include stdlib.h unconditionally.  Do not include
fcntl.h, systty.h does it.  Remove conditional code for
HAVE_SERIAL, it is always true.
(process_send_signal): Remove HAVE_TERMIOS conditional, it's
always true when SIGNALS_VIA_CHARACTERS is true.
(Fcontinue_process, Fprocess_send_eof): Simplify conditionals:
!WINDOWSNT means HAVE_TERMIOS.
(create_process): Remove HAVE_TERMIOS, it's inside a HAVE_PTYS
conditional, which is true for all HAVE_TERMIOS systems.
* src/keyboard.c (init_keyboard): Do not use HAVE_TERMIO, use !DOS_NT
instead of HAVE_TERMIOS.
* src/emacs.c (shut_down_emacs): Use !defined DOS_NT instead of
EMACS_HAVE_TTY_PGRP.
* src/callproc.c (child_setup): Move EMACS_SET_TTY_PGRP use to the
non-MSDOS, non-WINDOWSNT code, it's only defined for such systems
anyway.

7 files changed, 72 insertions, 371 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 403a588df4c..782c87642ce 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,42 @@
+2010-08-22  Dan Nicolaescu  <dann@ics.uci.edu>
+
+        Simplify termio code.
+        All non-MSDOS non-WINDOWSNT platforms define HAVE_TERMIOS, so
+        HAVE_TERMIO code is obsolete.
+        Replace HAVE_TERMIOS conditionals with !DOS_NT.
+        * systty.h: Do not define HAVE_TCATTR.
+        Remove HAVE_TERMIO, HAVE_LTCHARS and HAVE_TCHARS code.
+        Do not define EMACS_HAVE_TTY_PGRP.  Only define
+        EMACS_GET_TTY_PGRP for !DOS_NT.
+        * sysdep.c: Include sysselect.h unconditionally.  Do not include
+        sys/ioctl.h and termios.h, systty.h does it.  Use
+        HAVE_SYS_UTSNAME_H instead of USG as an include guard.
+        (init_baud_rate): Remove HAVE_TERMIO code.
+        (child_setup_tty): Remove HAVE_TERMIO code.
+        (emacs_get_tty, emacs_set_tty): Remove HAVE_TERMIO, HAVE_TCHARS
+        and HAVE_LTCHARS code.  Use !DOS_NT instead of HAVE_TCATTR.
+        (new_ltchars, new_tchars): Remove, unused.
+        (init_sys_modes): Remove HAVE_TERMIO, HAVE_TCHARS and HAVE_LTCHARS
+        code.  Remove special casing for __mips__, it was a no-op.  Remove
+        HAVE_TCATTR conditional, it is implied by HAVE_TERMIOS.
+        (init_sys_modes): Remove HPUX special case.
+        * process.c: Include stdlib.h unconditionally.  Do not include
+        fcntl.h, systty.h does it.  Remove conditional code for
+        HAVE_SERIAL, it is always true.
+        (process_send_signal): Remove HAVE_TERMIOS conditional, it's
+        always true when SIGNALS_VIA_CHARACTERS is true.
+        (Fcontinue_process, Fprocess_send_eof): Simplify conditionals:
+        !WINDOWSNT means HAVE_TERMIOS.
+        (create_process): Remove HAVE_TERMIOS, it's inside a HAVE_PTYS
+        conditional, which is true for all HAVE_TERMIOS systems.
+        * keyboard.c (init_keyboard): Do not use HAVE_TERMIO, use !DOS_NT
+        instead of HAVE_TERMIOS.
+        * emacs.c (shut_down_emacs): Use !defined DOS_NT instead of
+        EMACS_HAVE_TTY_PGRP.
+        * callproc.c (child_setup): Move EMACS_SET_TTY_PGRP use to the
+        non-MSDOS, non-WINDOWSNT code, it's only defined for such systems
+        anyway.
+
 2010-08-21  Eli Zaretskii  <eliz@gnu.org>
 
         * dispnew.c (buffer_posn_from_coords): Fix off-by-one error in
diff --git a/src/callproc.c b/src/callproc.c
index de28ffa42ef..8c1384df6a1 100644
--- a/src/callproc.c
+++ b/src/callproc.c
@@ -1231,8 +1231,6 @@ child_setup (int in, int out, int err, register char **new_argv, int set_pgrp, L
 #else
   setpgrp (pid, pid);
 #endif /* USG */
-  /* setpgrp_of_tty is incorrect here; it uses input_fd.  */
-  EMACS_SET_TTY_PGRP (0, &pid);
 
 #ifdef MSDOS
   pid = run_msdos_command (new_argv, pwd_var + 4, in, out, err, env);
@@ -1251,6 +1249,9 @@ child_setup (int in, int out, int err, register char **new_argv, int set_pgrp, L
     report_file_error ("Spawning child process", Qnil);
   return cpid;
 #else /* not WINDOWSNT */
+  /* setpgrp_of_tty is incorrect here; it uses input_fd.  */
+  EMACS_SET_TTY_PGRP (0, &pid);
+
   /* execvp does not accept an environment arg so the only way
      to pass this environment is to set environ.  Our caller
      is responsible for restoring the ambient value of environ.  */
diff --git a/src/emacs.c b/src/emacs.c
index 67a99d674e7..dc1453a34ac 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -2096,7 +2096,7 @@ shut_down_emacs (int sig, int no_x, Lisp_Object stuff)
   Vinhibit_redisplay = Qt;
 
   /* If we are controlling the terminal, reset terminal modes.  */
-#ifdef EMACS_HAVE_TTY_PGRP
+#ifndef DOS_NT
   {
     int pgrp = EMACS_GETPGRP (0);
 
diff --git a/src/keyboard.c b/src/keyboard.c
index 2fd13c4ae24..269e52988eb 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -11506,11 +11506,11 @@ init_keyboard (void)
          Emacs on SIGINT when there are no termcap frames on the
          controlling terminal. */
       signal (SIGINT, interrupt_signal);
-#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
+#ifndef DOS_NT
       /* For systems with SysV TERMIO, C-g is set up for both SIGINT and
          SIGQUIT and we can't tell which one it will give us.  */
       signal (SIGQUIT, interrupt_signal);
-#endif /* HAVE_TERMIO */
+#endif /* not DOS_NT */
     }
 /* Note SIGIO has been undef'd if FIONREAD is missing.  */
 #ifdef SIGIO
diff --git a/src/process.c b/src/process.c
index 4a658623077..f348dca7d35 100644
--- a/src/process.c
+++ b/src/process.c
@@ -31,9 +31,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #ifdef HAVE_INTTYPES_H
 #include <inttypes.h>
 #endif
-#ifdef STDC_HEADERS
 #include <stdlib.h>
-#endif
 
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
@@ -61,9 +59,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #if defined(HAVE_SYS_IOCTL_H)
 #include <sys/ioctl.h>
-#if !defined (O_NDELAY) && defined (HAVE_PTYS) && !defined(USG5)
-#include <fcntl.h>
-#endif /* HAVE_PTYS and no O_NDELAY */
 #if defined(HAVE_NET_IF_H)
 #include <net/if.h>
 #endif /* HAVE_NET_IF_H */
@@ -182,16 +177,9 @@ extern Lisp_Object QCfilter;
 
 extern const char *get_operating_system_release (void);
 
-/* Serial processes require termios or Windows.  */
-#if defined (HAVE_TERMIOS) || defined (WINDOWSNT)
-#define HAVE_SERIAL
-#endif
-
-#ifdef HAVE_SERIAL
 /* From sysdep.c or w32.c  */
 extern int serial_open (char *port);
 extern void serial_configure (struct Lisp_Process *p, Lisp_Object contact);
-#endif
 
 #ifndef HAVE_H_ERRNO
 extern int h_errno;
@@ -1903,7 +1891,7 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
         setpgrp ();
 #endif /* USG */
 #endif /* not HAVE_SETSID */
-#if defined (HAVE_TERMIOS) && defined (LDISC1)
+#if defined (LDISC1)
         if (pty_flag && xforkin >= 0)
           {
             struct termios t;
@@ -2569,7 +2557,6 @@ OPTION is not a supported option, return nil instead; otherwise return t.  */)
 }
 
 
-#ifdef HAVE_SERIAL
 DEFUN ("serial-process-configure",
        Fserial_process_configure,
        Sserial_process_configure,
@@ -2865,7 +2852,6 @@ usage:  (make-serial-process &rest ARGS)  */)
   UNGCPRO;
   return proc;
 }
-#endif /* HAVE_SERIAL  */
 
 /* Create a network stream/datagram client/server process.  Treated
    exactly like a normal process when reading and writing.  Primary
@@ -5801,9 +5787,6 @@ process_send_signal (Lisp_Object process, int signo, Lisp_Object current_group,
       /* If possible, send signals to the entire pgrp
          by sending an input character to it.  */
 
-      /* TERMIOS is the latest and bestest, and seems most likely to
-         work.  If the system has it, use it.  */
-#ifdef HAVE_TERMIOS
       struct termios t;
       cc_t *sig_char = NULL;
 
@@ -5835,65 +5818,6 @@ process_send_signal (Lisp_Object process, int signo, Lisp_Object current_group,
         }
       /* If we can't send the signal with a character,
          fall through and send it another way.  */
-#else /* ! HAVE_TERMIOS */
-
-      /* On Berkeley descendants, the following IOCTL's retrieve the
-         current control characters.  */
-#if defined (TIOCGLTC) && defined (TIOCGETC)
-
-      struct tchars c;
-      struct ltchars lc;
-
-      switch (signo)
-        {
-        case SIGINT:
-          ioctl (p->infd, TIOCGETC, &c);
-          send_process (proc, &c.t_intrc, 1, Qnil);
-          return;
-        case SIGQUIT:
-          ioctl (p->infd, TIOCGETC, &c);
-          send_process (proc, &c.t_quitc, 1, Qnil);
-          return;
-#ifdef SIGTSTP
-        case SIGTSTP:
-          ioctl (p->infd, TIOCGLTC, &lc);
-          send_process (proc, &lc.t_suspc, 1, Qnil);
-          return;
-#endif /* ! defined (SIGTSTP) */
-        }
-
-#else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
-
-      /* On SYSV descendants, the TCGETA ioctl retrieves the current control
-         characters.  */
-#ifdef TCGETA
-      struct termio t;
-      switch (signo)
-        {
-        case SIGINT:
-          ioctl (p->infd, TCGETA, &t);
-          send_process (proc, &t.c_cc[VINTR], 1, Qnil);
-          return;
-        case SIGQUIT:
-          ioctl (p->infd, TCGETA, &t);
-          send_process (proc, &t.c_cc[VQUIT], 1, Qnil);
-          return;
-#ifdef SIGTSTP
-        case SIGTSTP:
-          ioctl (p->infd, TCGETA, &t);
-          send_process (proc, &t.c_cc[VSWTCH], 1, Qnil);
-          return;
-#endif /* ! defined (SIGTSTP) */
-        }
-#else /* ! defined (TCGETA) */
-      Your configuration files are messed up.
-      /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
-         you'd better be using one of the alternatives above!  */
-#endif /* ! defined (TCGETA) */
-#endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
-        /* In this case, the code above should alway return.  */
-        abort ();
-#endif /* ! defined HAVE_TERMIOS */
 
       /* The code above may fall through if it can't
          handle the signal.  */
@@ -6065,10 +5989,9 @@ traffic.  */)
 #ifdef WINDOWSNT
           if (fd_info[ p->infd ].flags & FILE_SERIAL)
             PurgeComm (fd_info[ p->infd ].hnd, PURGE_RXABORT | PURGE_RXCLEAR);
-#endif
-#ifdef HAVE_TERMIOS
+#else /* not WINDOWSNT */
           tcflush (p->infd, TCIFLUSH);
-#endif
+#endif /* not WINDOWSNT */
         }
       p->command = Qnil;
       return process;
@@ -6282,10 +6205,10 @@ process has been transmitted to the serial port.  */)
     send_process (proc, "\004", 1, Qnil);
   else if (EQ (XPROCESS (proc)->type, Qserial))
     {
-#ifdef HAVE_TERMIOS
+#ifndef WINDOWSNT
       if (tcdrain (XPROCESS (proc)->outfd) != 0)
         error ("tcdrain() failed: %s", emacs_strerror (errno));
-#endif
+#endif /* not WINDOWSNT */
       /* Do nothing on Windows because writes are blocking.  */
     }
   else
@@ -7672,10 +7595,8 @@ The variable takes effect when `start-process' is called.  */);
   defsubr (&Slist_processes);
   defsubr (&Sprocess_list);
   defsubr (&Sstart_process);
-#ifdef HAVE_SERIAL
   defsubr (&Sserial_process_configure);
   defsubr (&Smake_serial_process);
-#endif /* HAVE_SERIAL  */
   defsubr (&Sset_network_process_option);
   defsubr (&Smake_network_process);
   defsubr (&Sformat_network_address);
diff --git a/src/sysdep.c b/src/sysdep.c
index 2ae3c509522..e7d35d46bf7 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -35,15 +35,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #endif
 
 #include "lisp.h"
-/* Including stdlib.h isn't necessarily enough to get srandom
-   declared, e.g. without __USE_XOPEN_EXTENDED with glibc 2.  */
-
-/* The w32 build defines select stuff in w32.h, which is included by
-   sys/select.h (included below).   */
-#ifndef WINDOWSNT
 #include "sysselect.h"
-#endif
-
 #include "blockinput.h"
 
 #ifdef WINDOWSNT
@@ -84,17 +76,13 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <fcntl.h>
 #endif
 
-#ifndef MSDOS
-#include <sys/ioctl.h>
-#endif
-
 #include "systty.h"
 #include "syswait.h"
 
-#if defined (USG)
+#ifdef HAVE_SYS_UTSNAME_H
 #include <sys/utsname.h>
 #include <memory.h>
-#endif /* USG */
+#endif /* HAVE_SYS_UTSNAME_H */
 
 #include "keyboard.h"
 #include "frame.h"
@@ -149,17 +137,6 @@ static const int baud_convert[] =
     1800, 2400, 4800, 9600, 19200, 38400
   };
 
-#ifdef HAVE_SPEED_T
-#include <termios.h>
-#else
-#if defined (HAVE_LIBNCURSES) && ! defined (NCURSES_OSPEED_T)
-#else
-#if defined (HAVE_TERMIOS_H) && defined (GNU_LINUX)
-#include <termios.h>
-#endif
-#endif
-#endif
-
 int emacs_ospeed;
 
 void croak (char *) NO_RETURN;
@@ -308,32 +285,11 @@ init_baud_rate (int fd)
 #ifdef DOS_NT
     emacs_ospeed = 15;
 #else  /* not DOS_NT */
-#ifdef HAVE_TERMIOS
       struct termios sg;
 
       sg.c_cflag = B9600;
       tcgetattr (fd, &sg);
       emacs_ospeed = cfgetospeed (&sg);
-#else /* not TERMIOS */
-#ifdef HAVE_TERMIO
-      struct termio sg;
-
-      sg.c_cflag = B9600;
-#ifdef HAVE_TCATTR
-      tcgetattr (fd, &sg);
-#else
-      ioctl (fd, TCGETA, &sg);
-#endif
-      emacs_ospeed = sg.c_cflag & CBAUD;
-#else /* neither TERMIOS nor TERMIO */
-      struct sgttyb sg;
-
-      sg.sg_ospeed = B9600;
-      if (ioctl (fd, TIOCGETP, &sg) < 0)
-        abort ();
-      emacs_ospeed = sg.sg_ospeed;
-#endif /* not HAVE_TERMIO */
-#endif /* not HAVE_TERMIOS */
 #endif /* not DOS_NT */
     }
 
@@ -417,7 +373,7 @@ wait_for_termination (int pid)
 void
 flush_pending_output (int channel)
 {
-#ifdef HAVE_TERMIOS
+#ifndef DOS_NT
   /* If we try this, we get hit with SIGTTIN, because
      the child's tty belongs to the child's pgrp. */
 #else
@@ -447,8 +403,6 @@ child_setup_tty (int out)
   struct emacs_tty s;
 
   EMACS_GET_TTY (out, &s);
-
-#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
   s.main.c_oflag |= OPOST;      /* Enable output postprocessing */
   s.main.c_oflag &= ~ONLCR;     /* Disable map of NL to CR-NL on output */
 #ifdef NLDLY
@@ -526,19 +480,7 @@ child_setup_tty (int out)
   s.main.c_cc[VTIME] = 0;
 #endif
 
-#else /* not HAVE_TERMIO */
-
-  s.main.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE
-                       | CBREAK | TANDEM);
-  s.main.sg_flags |= LPASS8;
-  s.main.sg_erase = 0377;
-  s.main.sg_kill = 0377;
-  s.lmode = LLITOUT | s.lmode;        /* Don't strip 8th bit */
-
-#endif /* not HAVE_TERMIO */
-
   EMACS_SET_TTY (out, &s, 0);
-
 #endif /* not WINDOWSNT */
 }
 #endif  /* MSDOS */
@@ -841,38 +783,11 @@ int
 emacs_get_tty (int fd, struct emacs_tty *settings)
 {
   /* Retrieve the primary parameters - baud rate, character size, etcetera.  */
-#ifdef HAVE_TCATTR
+#ifndef DOS_NT
   /* We have those nifty POSIX tcmumbleattr functions.  */
   memset (&settings->main, 0, sizeof (settings->main));
   if (tcgetattr (fd, &settings->main) < 0)
     return -1;
-
-#else
-#ifdef HAVE_TERMIO
-  /* The SYSV-style interface?  */
-  if (ioctl (fd, TCGETA, &settings->main) < 0)
-    return -1;
-
-#else
-#ifndef DOS_NT
-  /* I give up - I hope you have the BSD ioctls.  */
-  if (ioctl (fd, TIOCGETP, &settings->main) < 0)
-    return -1;
-#endif /* not DOS_NT */
-#endif
-#endif
-
-  /* Suivant - Do we have to get struct ltchars data?  */
-#ifdef HAVE_LTCHARS
-  if (ioctl (fd, TIOCGLTC, &settings->ltchars) < 0)
-    return -1;
-#endif
-
-  /* How about a struct tchars and a wordful of lmode bits?  */
-#ifdef HAVE_TCHARS
-  if (ioctl (fd, TIOCGETC, &settings->tchars) < 0
-      || ioctl (fd, TIOCLGET, &settings->lmode) < 0)
-    return -1;
 #endif
 
   /* We have survived the tempest.  */
@@ -888,7 +803,7 @@ int
 emacs_set_tty (int fd, struct emacs_tty *settings, int flushp)
 {
   /* Set the primary parameters - baud rate, character size, etcetera.  */
-#ifdef HAVE_TCATTR
+#ifndef DOS_NT
   int i;
   /* We have those nifty POSIX tcmumbleattr functions.
      William J. Smith <wjs@wiis.wang.com> writes:
@@ -926,34 +841,6 @@ emacs_set_tty (int fd, struct emacs_tty *settings, int flushp)
         else
           continue;
       }
-
-#else
-#ifdef HAVE_TERMIO
-  /* The SYSV-style interface?  */
-  if (ioctl (fd, flushp ? TCSETAF : TCSETAW, &settings->main) < 0)
-    return -1;
-
-#else
-#ifndef DOS_NT
-  /* I give up - I hope you have the BSD ioctls.  */
-  if (ioctl (fd, (flushp) ? TIOCSETP : TIOCSETN, &settings->main) < 0)
-    return -1;
-#endif /* not DOS_NT */
-
-#endif
-#endif
-
-  /* Suivant - Do we have to get struct ltchars data?  */
-#ifdef HAVE_LTCHARS
-  if (ioctl (fd, TIOCSLTC, &settings->ltchars) < 0)
-    return -1;
-#endif
-
-  /* How about a struct tchars and a wordful of lmode bits?  */
-#ifdef HAVE_TCHARS
-  if (ioctl (fd, TIOCSETC, &settings->tchars) < 0
-      || ioctl (fd, TIOCLSET, &settings->lmode) < 0)
-    return -1;
 #endif
 
   /* We have survived the tempest.  */
@@ -976,13 +863,6 @@ unsigned char _sobuf[BUFSIZ+8];
 char _sobuf[BUFSIZ];
 #endif
 
-#ifdef HAVE_LTCHARS
-static struct ltchars new_ltchars = {-1,-1,-1,-1,-1,-1};
-#endif
-#ifdef HAVE_TCHARS
-static struct tchars new_tchars = {-1,-1,-1,-1,-1,-1};
-#endif
-
 /* Initialize the terminal mode on all tty devices that are currently
    open. */
 
@@ -1016,7 +896,7 @@ init_sys_modes (struct tty_display_info *tty_out)
 
   tty = *tty_out->old_tty;
 
-#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
+#if !defined (DOS_NT)
   XSETINT (Vtty_erase_char, tty.main.c_cc[VERASE]);
 
   tty.main.c_iflag |= (IGNBRK); /* Ignore break condition */
@@ -1088,12 +968,11 @@ init_sys_modes (struct tty_display_info *tty_out)
                                            of C-z */
 #endif /* VSWTCH */
 
-#if defined (__mips__) || defined (HAVE_TCATTR)
 #ifdef VSUSP
-  tty.main.c_cc[VSUSP] = CDISABLE;      /* Turn off mips handling of C-z.  */
+  tty.main.c_cc[VSUSP] = CDISABLE;      /* Turn off handling of C-z.  */
 #endif /* VSUSP */
 #ifdef V_DSUSP
-  tty.main.c_cc[V_DSUSP] = CDISABLE; /* Turn off mips handling of C-y.  */
+  tty.main.c_cc[V_DSUSP] = CDISABLE; /* Turn off handling of C-y.  */
 #endif /* V_DSUSP */
 #ifdef VDSUSP /* Some systems have VDSUSP, some have V_DSUSP.  */
   tty.main.c_cc[VDSUSP] = CDISABLE;
@@ -1129,7 +1008,6 @@ init_sys_modes (struct tty_display_info *tty_out)
       tty.main.c_cc[VSTOP] = CDISABLE;
 #endif /* VSTOP */
     }
-#endif /* mips or HAVE_TCATTR */
 
 #ifdef AIX
   tty.main.c_cc[VSTRT] = CDISABLE;
@@ -1152,41 +1030,8 @@ init_sys_modes (struct tty_display_info *tty_out)
   tty.main.c_iflag &= ~IGNBRK;
   tty.main.c_iflag &= ~BRKINT;
 #endif
-#else /* if not HAVE_TERMIO */
-#ifndef DOS_NT
-  XSETINT (Vtty_erase_char, tty.main.sg_erase);
-  tty.main.sg_flags &= ~(ECHO | CRMOD | XTABS);
-  if (meta_key)
-    tty.main.sg_flags |= ANYP;
-  tty.main.sg_flags |= interrupt_input ? RAW : CBREAK;
 #endif /* not DOS_NT */
-#endif /* not HAVE_TERMIO */
-
-  /* If going to use CBREAK mode, we must request C-g to interrupt
-     and turn off start and stop chars, etc.  If not going to use
-     CBREAK mode, do this anyway so as to turn off local flow
-     control for user coming over network on 4.2; in this case,
-     only t_stopc and t_startc really matter.  */
-#ifndef HAVE_TERMIO
-#ifdef HAVE_TCHARS
-  /* Note: if not using CBREAK mode, it makes no difference how we
-     set this */
-  tty.tchars = new_tchars;
-  tty.tchars.t_intrc = quit_char;
-  if (tty_out->flow_control)
-    {
-      tty.tchars.t_startc = '\021';
-      tty.tchars.t_stopc = '\023';
-    }
 
-  tty.lmode = LDECCTQ | LLITOUT | LPASS8 | LNOFLSH | tty_out->old_tty.lmode;
-
-#endif /* HAVE_TCHARS */
-#endif /* not HAVE_TERMIO */
-
-#ifdef HAVE_LTCHARS
-  tty.ltchars = new_ltchars;
-#endif /* HAVE_LTCHARS */
 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
   if (!tty_out->term_initted)
     internal_terminal_init ();
@@ -1205,7 +1050,7 @@ init_sys_modes (struct tty_display_info *tty_out)
   if (!tty_out->flow_control) ioctl (fileno (tty_out->input), TIOCSTART, 0);
 #endif
 
-#if defined (HAVE_TERMIOS) || defined (HPUX)
+#if !defined (DOS_NT)
 #ifdef TCOON
   if (!tty_out->flow_control) tcflow (fileno (tty_out->input), TCOON);
 #endif
@@ -2688,7 +2533,7 @@ strsignal (int code)
 }
 #endif /* HAVE_STRSIGNAL */
 
-#ifdef HAVE_TERMIOS
+#ifndef DOS_NT
 /* For make-serial-process  */
 int
 serial_open (char *port)
@@ -2717,9 +2562,6 @@ serial_open (char *port)
 
   return fd;
 }
-#endif /* TERMIOS  */
-
-#ifdef HAVE_TERMIOS
 
 #if !defined (HAVE_CFMAKERAW)
 /* Workaround for targets which are missing cfmakeraw.  */
@@ -2906,7 +2748,7 @@ serial_configure (struct Lisp_Process *p,
   p->childp = childp2;
 
 }
-#endif /* TERMIOS  */
+#endif /* not DOS_NT  */
 
 /* System depended enumeration of and access to system processes a-la ps(1).  */
 
diff --git a/src/systty.h b/src/systty.h
index 39feef9c3d0..8c46411cedb 100644
--- a/src/systty.h
+++ b/src/systty.h
@@ -17,34 +17,17 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
-#ifdef HAVE_TERMIOS
-#define HAVE_TCATTR
-#endif
-
-
 /* Include the proper files.  */
-#ifdef HAVE_TERMIO
+#ifndef DOS_NT
 #ifndef NO_TERMIO
 #include <termio.h>
 #endif /* not NO_TERMIO */
-#include <fcntl.h>
-#else /* not HAVE_TERMIO */
-#ifdef HAVE_TERMIOS
-#ifndef NO_TERMIO
-#include <termio.h>
-#endif
 #include <termios.h>
 #include <fcntl.h>
-#else /* neither HAVE_TERMIO nor HAVE_TERMIOS */
-#ifndef DOS_NT
-#include <sgtty.h>
 #endif /* not DOS_NT */
-#endif /* not HAVE_TERMIOS */
-#endif /* not HAVE_TERMIO */
 
-#ifdef __GNU_LIBRARY__
+#ifdef HAVE_SYS_IOCTL_H
 #include <sys/ioctl.h>
-#include <termios.h>
 #endif
 
 #ifdef HPUX
@@ -74,17 +57,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #undef SIGIO
 #endif
 
-/* On TERMIOS systems, the tcmumbleattr calls take care of these
-   parameters, and it's a bad idea to use them (on AIX, it makes the
-   tty hang for a long time).  */
-#if defined (TIOCGLTC) && !defined (HAVE_TERMIOS)
-#define HAVE_LTCHARS
-#endif
-
-#if defined (TIOCGETC) && !defined (HAVE_TERMIOS)
-#define HAVE_TCHARS
-#endif
-
 
 /* Try to establish the correct character to disable terminal functions
    in a system-independent manner.  Note that USG (at least) define
@@ -111,60 +83,19 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #define EMACS_OUTQSIZE(fd, size) (ioctl ((fd), TIOCOUTQ, (size)))
 #endif
 
-#ifdef HAVE_TERMIO
-#ifdef TCOUTQ
-#undef EMACS_OUTQSIZE
-#define EMACS_OUTQSIZE(fd, size) (ioctl ((fd), TCOUTQ, (size)))
-#endif
-#endif
-
 
 /* Manipulate a terminal's current process group.  */
 
-/* EMACS_HAVE_TTY_PGRP is true if we can get and set the tty's current
-   controlling process group.
-
-   EMACS_GET_TTY_PGRP(int FD, int *PGID) sets *PGID the terminal FD's
+/* EMACS_GET_TTY_PGRP(int FD, int *PGID) sets *PGID the terminal FD's
    current process group.  Return -1 if there is an error.
 
    EMACS_SET_TTY_PGRP(int FD, int *PGID) sets the terminal FD's
    current process group to *PGID.  Return -1 if there is an error.  */
 
-/* HPUX tty process group stuff doesn't work, says the anonymous voice
-   from the past.  */
-#ifndef HPUX
-#ifdef TIOCGPGRP
-#define EMACS_HAVE_TTY_PGRP
-#else
-#ifdef HAVE_TERMIOS
-#define EMACS_HAVE_TTY_PGRP
-#endif /* HAVE_TERMIOS */
-#endif /* TIOCGPGRP */
-#endif /* not HPUX */
-
-#ifdef EMACS_HAVE_TTY_PGRP
-
-#if defined (HAVE_TERMIOS)
-
+#ifndef DOS_NT
 #define EMACS_GET_TTY_PGRP(fd, pgid) (*(pgid) = tcgetpgrp ((fd)))
 #define EMACS_SET_TTY_PGRP(fd, pgid) (tcsetpgrp ((fd), *(pgid)))
-
-#else /* not HAVE_TERMIOS */
-#ifdef TIOCSPGRP
-
-#define EMACS_GET_TTY_PGRP(fd, pgid) (ioctl ((fd), TIOCGPGRP, (pgid)))
-#define EMACS_SET_TTY_PGRP(fd, pgid) (ioctl ((fd), TIOCSPGRP, (pgid)))
-
-#endif /* TIOCSPGRP */
-#endif /* HAVE_TERMIOS */
-
-#else /* not EMACS_SET_TTY_PGRP */
-
-/* Just ignore this for now and hope for the best */
-#define EMACS_GET_TTY_PGRP(fd, pgid) 0
-#define EMACS_SET_TTY_PGRP(fd, pgif) 0
-
-#endif /* not EMACS_SET_TTY_PGRP */
+#endif /* not DOS_NT */
 
 /* EMACS_GETPGRP (arg) returns the process group of the process.  */
 
@@ -207,32 +138,11 @@ struct emacs_tty {
 
 /* There is always one of the following elements, so there is no need
    for dummy get and set definitions.  */
-#ifdef HAVE_TCATTR
+#ifndef DOS_NT
   struct termios main;
-#else /* not HAVE_TCATTR */
-#ifdef HAVE_TERMIO
-  struct termio main;
-#else /* not HAVE_TERMIO */
-#ifdef DOS_NT
+#else /* DOS_NT */
   int main;
-#else  /* not DOS_NT */
-  struct sgttyb main;
-#endif /* not DOS_NT */
-#endif /* not HAVE_TERMIO */
-#endif /* not HAVE_TCATTR */
-
-/* If we have TERMIOS, we don't need to do this - they're taken care of
-   by the tc*attr calls.  */
-#ifndef HAVE_TERMIOS
-#ifdef HAVE_LTCHARS
-  struct ltchars ltchars;
-#endif /* HAVE_LTCHARS */
-
-#ifdef HAVE_TCHARS
-  struct tchars tchars;
-  int lmode;
-#endif /* HAVE_TCHARS */
-#endif /* not defined HAVE_TERMIOS */
+#endif /* DOS_NT */
 };
 
 /* Define EMACS_GET_TTY and EMACS_SET_TTY,
@@ -249,7 +159,7 @@ extern int emacs_set_tty (int, struct emacs_tty *, int);
 
 /* Define EMACS_TTY_TABS_OK.  */
 
-#ifdef HAVE_TERMIOS
+#ifndef DOS_NT
 
 #ifdef TABDLY
 #define EMACS_TTY_TABS_OK(p) (((p)->main.c_oflag & TABDLY) != TAB3)
@@ -257,21 +167,9 @@ extern int emacs_set_tty (int, struct emacs_tty *, int);
 #define EMACS_TTY_TABS_OK(p) 1
 #endif /* not TABDLY */
 
-#else /* not def HAVE_TERMIOS */
-#ifdef HAVE_TERMIO
-
-#define EMACS_TTY_TABS_OK(p) (((p)->main.c_oflag & TABDLY) != TAB3)
-
-#else /* neither HAVE_TERMIO nor HAVE_TERMIOS */
-
-#ifdef DOS_NT
+#else /* DOS_NT */
 #define EMACS_TTY_TABS_OK(p) 0
-#else /* not DOS_NT */
-#define EMACS_TTY_TABS_OK(p) (((p)->main.sg_flags & XTABS) != XTABS)
-#endif /* not DOS_NT */
-
-#endif /* not def HAVE_TERMIO */
-#endif /* not def HAVE_TERMIOS */
+#endif /* DOS_NT */
 
 /* arch-tag: cf4b90bc-be41-401c-be98-40619178a712
    (do not change this comment) */