diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 6cb0970..c2f6482 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -729,12 +729,9 @@ XMLFILES = \
 	$(srcdir)/features/traceframe-info.dtd \
 	$(srcdir)/features/xinclude.dtd
 
-# This is ser-unix.o for any system which supports a v7/BSD/SYSV/POSIX
-# interface to the serial port.  Hopefully if get ported to OS/2, VMS,
-# etc., then there will be (as part of the C library or perhaps as
-# part of libiberty) a POSIX interface.  But at least for now the
-# host-dependent makefile fragment might need to use something else
-# besides ser-unix.o
+# This is ser-unix.o for any system which supports a POSIX interface
+# to the serial port.  The host-dependent makefile fragment might need
+# to use something else besides ser-unix.o.
 SER_HARDWIRE = @SER_HARDWIRE@
 
 # The `remote' debugging target is supported for most architectures,
diff --git a/gdb/common/gdb_termios.h b/gdb/common/gdb_termios.h
deleted file mode 100644
index 1d0544d..0000000
--- a/gdb/common/gdb_termios.h
+++ /dev/null
@@ -1,78 +0,0 @@
-/* Common terminal interface definitions for GDB and gdbserver.
-   Copyright (C) 1986-2017 Free Software Foundation, Inc.
-
-   This file is part of GDB.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#ifndef GDB_TERMIOS_H
-#define GDB_TERMIOS_H
-
-/* If we're using autoconf, it will define HAVE_TERMIOS_H,
-   HAVE_TERMIO_H and HAVE_SGTTY_H for us.  One day we can rewrite
-   ser-unix.c and inflow.c to inspect those names instead of
-   HAVE_TERMIOS, HAVE_TERMIO and the implicit HAVE_SGTTY (when neither
-   HAVE_TERMIOS or HAVE_TERMIO is set).  Until then, make sure that
-   nothing has already defined the one of the names, and do the right
-   thing.  */
-
-#if !defined (HAVE_TERMIOS) && !defined(HAVE_TERMIO) && !defined(HAVE_SGTTY)
-#if defined(HAVE_TERMIOS_H)
-#define HAVE_TERMIOS
-#else /* ! defined (HAVE_TERMIOS_H) */
-#if defined(HAVE_TERMIO_H)
-#define HAVE_TERMIO
-#else /* ! defined (HAVE_TERMIO_H) */
-#if defined(HAVE_SGTTY_H)
-#define HAVE_SGTTY
-#endif /* ! defined (HAVE_SGTTY_H) */
-#endif /* ! defined (HAVE_TERMIO_H) */
-#endif /* ! defined (HAVE_TERMIOS_H) */
-#endif /* !defined (HAVE_TERMIOS) && !defined (HAVE_TERMIO) &&
-	  !defined (HAVE_SGTTY) */
-
-#if defined(HAVE_TERMIOS)
-#include <termios.h>
-#endif
-
-#if !defined(_WIN32) && !defined (HAVE_TERMIOS)
-
-/* Define a common set of macros -- BSD based -- and redefine whatever
-   the system offers to make it look like that.  FIXME: serial.h and
-   ser-*.c deal with this in a much cleaner fashion; as soon as stuff
-   is converted to use them, can get rid of this crap.  */
-
-#ifdef HAVE_TERMIO
-
-#include <termio.h>
-
-#undef TIOCGETP
-#define TIOCGETP TCGETA
-#undef TIOCSETN
-#define TIOCSETN TCSETA
-#undef TIOCSETP
-#define TIOCSETP TCSETAF
-#define TERMINAL struct termio
-
-#else /* sgtty */
-
-#include <fcntl.h>
-#include <sgtty.h>
-#include <sys/ioctl.h>
-#define TERMINAL struct sgttyb
-
-#endif /* sgtty */
-#endif
-
-#endif /* ! GDB_TERMIOS_H */
diff --git a/gdb/common/job-control.c b/gdb/common/job-control.c
index d76bc57..78fc672 100644
--- a/gdb/common/job-control.c
+++ b/gdb/common/job-control.c
@@ -20,7 +20,10 @@
 
 #include "common-defs.h"
 #include "job-control.h"
-#include "gdb_termios.h"
+#ifdef HAVE_TERMIOS_H
+#include <termios.h>
+#endif
+#include <unistd.h>
 
 /* Nonzero if we have job control.  */
 int job_control;
@@ -41,7 +44,6 @@ gdb_setpgid ()
 
   if (job_control)
     {
-#if defined (HAVE_TERMIOS) || defined (TIOCGPGRP)
 #ifdef HAVE_SETPGID
       /* The call setpgid (0, 0) is supposed to work and mean the same
          thing as this, but on Ultrix 4.2A it fails with EPERM (and
@@ -56,7 +58,6 @@ gdb_setpgid ()
 #endif
 #endif /* HAVE_SETPGRP */
 #endif /* HAVE_SETPGID */
-#endif /* defined (HAVE_TERMIOS) || defined (TIOCGPGRP) */
     }
 
   return retval;
@@ -67,9 +68,9 @@ gdb_setpgid ()
 void
 have_job_control ()
 {
-  /* OK, figure out whether we have job control.  If neither termios nor
-     sgtty (i.e. termio or go32), leave job_control 0.  */
-#if defined (HAVE_TERMIOS)
+  /* OK, figure out whether we have job control.  If termios is not
+     available, leave job_control 0.  */
+#if defined (HAVE_TERMIOS_H)
   /* Do all systems with termios have the POSIX way of identifying job
      control?  I hope so.  */
 #ifdef _POSIX_JOB_CONTROL
@@ -81,13 +82,5 @@ have_job_control ()
   job_control = 0;		/* Have to assume the worst.  */
 #endif /* _SC_JOB_CONTROL */
 #endif /* _POSIX_JOB_CONTROL */
-#endif /* HAVE_TERMIOS */
-
-#ifdef HAVE_SGTTY
-#ifdef TIOCGPGRP
-  job_control = 1;
-#else
-  job_control = 0;
-#endif /* TIOCGPGRP */
-#endif /* sgtty */
+#endif /* HAVE_TERMIOS_H */
 }
diff --git a/gdb/configure b/gdb/configure
index 6b445e4..c638652 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -11554,8 +11554,7 @@ for ac_header in nlist.h machine/reg.h poll.h sys/poll.h proc_service.h \
 		  sys/file.h sys/filio.h sys/ioctl.h sys/param.h \
 		  sys/resource.h sys/procfs.h sys/ptrace.h ptrace.h \
 		  sys/reg.h sys/debugreg.h sys/select.h sys/syscall.h \
-		  termios.h termio.h \
-		  sgtty.h elf_hp.h \
+		  termios.h elf_hp.h \
 		  dlfcn.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
diff --git a/gdb/configure.ac b/gdb/configure.ac
index 4e64c80..b909217 100644
--- a/gdb/configure.ac
+++ b/gdb/configure.ac
@@ -1298,8 +1298,7 @@ AC_CHECK_HEADERS([nlist.h machine/reg.h poll.h sys/poll.h proc_service.h \
 		  sys/file.h sys/filio.h sys/ioctl.h sys/param.h \
 		  sys/resource.h sys/procfs.h sys/ptrace.h ptrace.h \
 		  sys/reg.h sys/debugreg.h sys/select.h sys/syscall.h \
-		  termios.h termio.h \
-		  sgtty.h elf_hp.h \
+		  termios.h elf_hp.h \
 		  dlfcn.h])
 AC_CHECK_HEADERS(sys/proc.h, [], [],
 [#if HAVE_SYS_PARAM_H
diff --git a/gdb/gdbserver/configure b/gdb/gdbserver/configure
index abab163..d5c62fb 100755
--- a/gdb/gdbserver/configure
+++ b/gdb/gdbserver/configure
@@ -6177,7 +6177,7 @@ $as_echo "$as_me: running $SHELL $ac_sub_configure $ac_sub_configure_args --cach
   cd "$ac_popdir"
 
 
-for ac_header in sgtty.h termio.h termios.h sys/reg.h string.h 		 proc_service.h sys/procfs.h linux/elf.h 		 fcntl.h signal.h sys/file.h 		 sys/ioctl.h netinet/in.h sys/socket.h netdb.h 		 netinet/tcp.h arpa/inet.h
+for ac_header in termios.h sys/reg.h string.h 		 proc_service.h sys/procfs.h linux/elf.h 		 fcntl.h signal.h sys/file.h 		 sys/ioctl.h netinet/in.h sys/socket.h netdb.h 		 netinet/tcp.h arpa/inet.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
diff --git a/gdb/gdbserver/configure.ac b/gdb/gdbserver/configure.ac
index 60e235d..456d3b3 100644
--- a/gdb/gdbserver/configure.ac
+++ b/gdb/gdbserver/configure.ac
@@ -96,7 +96,7 @@ ACX_CONFIGURE_DIR(["../gnulib"], ["build-gnulib-gdbserver"],
 
 ACX_CONFIGURE_DIR(["../../libiberty"], ["build-libiberty-gdbserver"])
 
-AC_CHECK_HEADERS(sgtty.h termio.h termios.h sys/reg.h string.h dnl
+AC_CHECK_HEADERS(termios.h sys/reg.h string.h dnl
 		 proc_service.h sys/procfs.h linux/elf.h dnl
 		 fcntl.h signal.h sys/file.h dnl
 		 sys/ioctl.h netinet/in.h sys/socket.h netdb.h dnl
diff --git a/gdb/gdbserver/remote-utils.c b/gdb/gdbserver/remote-utils.c
index 66e06522..54f27f4 100644
--- a/gdb/gdbserver/remote-utils.c
+++ b/gdb/gdbserver/remote-utils.c
@@ -17,7 +17,9 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include "server.h"
-#include "gdb_termios.h"
+#if HAVE_TERMIOS_H
+#include <termios.h>
+#endif
 #include "target.h"
 #include "gdbthread.h"
 #include "tdesc.h"
@@ -325,7 +327,7 @@ remote_open (const char *name)
       if (remote_desc < 0)
 	perror_with_name ("Could not open remote device");
 
-#ifdef HAVE_TERMIOS
+#if HAVE_TERMIOS_H
       {
 	struct termios termios;
 	tcgetattr (remote_desc, &termios);
@@ -342,33 +344,6 @@ remote_open (const char *name)
       }
 #endif
 
-#ifdef HAVE_TERMIO
-      {
-	struct termio termio;
-	ioctl (remote_desc, TCGETA, &termio);
-
-	termio.c_iflag = 0;
-	termio.c_oflag = 0;
-	termio.c_lflag = 0;
-	termio.c_cflag &= ~(CSIZE | PARENB);
-	termio.c_cflag |= CLOCAL | CS8;
-	termio.c_cc[VMIN] = 1;
-	termio.c_cc[VTIME] = 0;
-
-	ioctl (remote_desc, TCSETA, &termio);
-      }
-#endif
-
-#ifdef HAVE_SGTTY
-      {
-	struct sgttyb sg;
-
-	ioctl (remote_desc, TIOCGETP, &sg);
-	sg.sg_flags = RAW;
-	ioctl (remote_desc, TIOCSETP, &sg);
-      }
-#endif
-
       fprintf (stderr, "Remote debugging using %s\n", name);
 
       enable_async_notification (remote_desc);
diff --git a/gdb/inflow.c b/gdb/inflow.c
index d54b8f8..a96d4fc 100644
--- a/gdb/inflow.c
+++ b/gdb/inflow.c
@@ -31,7 +31,9 @@
 
 #include "inflow.h"
 #include "gdbcmd.h"
-#include "gdb_termios.h"
+#ifdef HAVE_TERMIOS_H
+#include <termios.h>
+#endif
 #include "job-control.h"
 
 #ifdef HAVE_SYS_IOCTL_H
@@ -64,9 +66,9 @@ struct terminal_info
      it when it resumes.  */
   serial_ttystate ttystate;
 
-#ifdef PROCESS_GROUP_TYPE
+#ifdef HAVE_TERMIOS_H
   /* Process group.  Saved and restored just like ttystate.  */
-  PROCESS_GROUP_TYPE process_group;
+  pid_t process_group;
 #endif
 
   /* fcntl flags.  Saved and restored just like ttystate.  */
@@ -89,11 +91,11 @@ static serial_ttystate initial_gdb_ttystate;
 
 static struct terminal_info *get_inflow_inferior_data (struct inferior *);
 
-#ifdef PROCESS_GROUP_TYPE
+#ifdef HAVE_TERMIOS_H
 
 /* Return the process group of the current inferior.  */
 
-PROCESS_GROUP_TYPE
+pid_t
 inferior_process_group (void)
 {
   return get_inflow_inferior_data (current_inferior ())->process_group;
@@ -121,25 +123,6 @@ static const char *inferior_thisrun_terminal;
 
 int terminal_is_ours;
 
-#ifdef PROCESS_GROUP_TYPE
-static PROCESS_GROUP_TYPE
-gdb_getpgrp (void)
-{
-  int process_group = -1;
-
-#ifdef HAVE_TERMIOS
-  process_group = tcgetpgrp (0);
-#endif
-#ifdef HAVE_TERMIO
-  process_group = getpgrp ();
-#endif
-#ifdef HAVE_SGTTY
-  ioctl (0, TIOCGPGRP, &process_group);
-#endif
-  return process_group;
-}
-#endif
-
 /* See terminal.h.  */
 
 void
@@ -157,8 +140,8 @@ set_initial_gdb_ttystate (void)
 #ifdef F_GETFL
       our_terminal_info.tflags = fcntl (0, F_GETFL, 0);
 #endif
-#ifdef PROCESS_GROUP_TYPE
-      our_terminal_info.process_group = gdb_getpgrp ();
+#ifdef HAVE_TERMIOS_H
+      our_terminal_info.process_group = tcgetpgrp (0);
 #endif
     }
 }
@@ -187,7 +170,7 @@ child_terminal_init_with_pgrp (int pgrp)
   struct inferior *inf = current_inferior ();
   struct terminal_info *tinfo = get_inflow_inferior_data (inf);
 
-#ifdef PROCESS_GROUP_TYPE
+#ifdef HAVE_TERMIOS_H
   /* Store the process group even without a terminal as it is used not
      only to reset the tty foreground process group, but also to
      interrupt the inferior.  */
@@ -224,7 +207,7 @@ gdb_save_tty_state (void)
 void
 child_terminal_init (struct target_ops *self)
 {
-#ifdef PROCESS_GROUP_TYPE
+#ifdef HAVE_TERMIOS_H
   /* This is for Lynx, and should be cleaned up by having Lynx be a
      separate debugging target with a version of target_terminal::init
      which passes in the process group to a generic routine which does
@@ -232,7 +215,7 @@ child_terminal_init (struct target_ops *self)
      pass in inferior_ptid to the same routine).  */
   /* We assume INFERIOR_PID is also the child's process group.  */
   child_terminal_init_with_pgrp (ptid_get_pid (inferior_ptid));
-#endif /* PROCESS_GROUP_TYPE */
+#endif /* HAVE_TERMIOS_H */
 }
 
 /* Put the inferior's terminal settings into effect.
@@ -269,11 +252,7 @@ child_terminal_inferior (struct target_ops *self)
       OOPSY ("fcntl F_SETFL");
 #endif
 
-      /* Because we were careful to not change in or out of raw mode in
-         terminal_ours, we will not change in our out of raw mode with
-         this call, so we don't flush any input.  */
-      result = serial_set_tty_state (stdin_serial,
-				     tinfo->ttystate);
+      result = serial_set_tty_state (stdin_serial, tinfo->ttystate);
       OOPSY ("setting tty state");
 
       if (!job_control)
@@ -298,19 +277,12 @@ child_terminal_inferior (struct target_ops *self)
 
       if (job_control)
 	{
-#ifdef HAVE_TERMIOS
+#ifdef HAVE_TERMIOS_H
 	  result = tcsetpgrp (0, tinfo->process_group);
 	  if (!inf->attach_flag)
 	    OOPSY ("tcsetpgrp");
 #endif
-
-#ifdef HAVE_SGTTY
-	  result = ioctl (0, TIOCSPGRP, &tinfo->process_group);
-	  if (!inf->attach_flag)
-	    OOPSY ("TIOCSPGRP");
-#endif
 	}
-
     }
   terminal_is_ours = 0;
 }
@@ -388,34 +360,20 @@ child_terminal_ours_1 (int output_only)
       xfree (tinfo->ttystate);
       tinfo->ttystate = serial_get_tty_state (stdin_serial);
 
-#ifdef PROCESS_GROUP_TYPE
+#ifdef HAVE_TERMIOS_H
       if (!inf->attach_flag)
-	/* If setpgrp failed in terminal_inferior, this would give us
+	/* If tcsetpgrp failed in terminal_inferior, this would give us
 	   our process group instead of the inferior's.  See
 	   terminal_inferior for details.  */
-	tinfo->process_group = gdb_getpgrp ();
+	tinfo->process_group = tcgetpgrp (0);
 #endif
 
-      /* Here we used to set ICANON in our ttystate, but I believe this
-         was an artifact from before when we used readline.  Readline sets
-         the tty state when it needs to.
-         FIXME-maybe: However, query() expects non-raw mode and doesn't
-         use readline.  Maybe query should use readline (on the other hand,
-         this only matters for HAVE_SGTTY, not termio or termios, I think).  */
-
-      /* Set tty state to our_ttystate.  We don't change in our out of raw
-         mode, to avoid flushing input.  We need to do the same thing
-         regardless of output_only, because we don't have separate
-         terminal_is_ours and terminal_is_ours_for_output flags.  It's OK,
-         though, since readline will deal with raw mode when/if it needs
-         to.  */
-
-      serial_noflush_set_tty_state (stdin_serial, our_terminal_info.ttystate,
-				    tinfo->ttystate);
+      /* Set tty state to our_ttystate.  */
+      serial_set_tty_state (stdin_serial, our_terminal_info.ttystate);
 
       if (job_control)
 	{
-#ifdef HAVE_TERMIOS
+#ifdef HAVE_TERMIOS_H
 	  result = tcsetpgrp (0, our_terminal_info.process_group);
 #if 0
 	  /* This fails on Ultrix with EINVAL if you run the testsuite
@@ -428,10 +386,6 @@ child_terminal_ours_1 (int output_only)
 				safe_strerror (errno));
 #endif
 #endif /* termios */
-
-#ifdef HAVE_SGTTY
-	  result = ioctl (0, TIOCSPGRP, &our_terminal_info.process_group);
-#endif
 	}
 
 #ifdef SIGTTOU
@@ -616,7 +570,7 @@ child_terminal_info (struct target_ops *self, const char *args, int from_tty)
     printf_filtered ("\n");
   }
 
-#ifdef PROCESS_GROUP_TYPE
+#ifdef HAVE_TERMIOS_H
   printf_filtered ("Process group = %d\n", (int) tinfo->process_group);
 #endif
 
diff --git a/gdb/inflow.h b/gdb/inflow.h
index 428aed4..0b00c61 100644
--- a/gdb/inflow.h
+++ b/gdb/inflow.h
@@ -20,17 +20,11 @@
 #ifndef INFLOW_H
 #define INFLOW_H
 
-#include "gdb_termios.h"
+#include <unistd.h>
 
-#ifdef HAVE_TERMIOS
-# define PROCESS_GROUP_TYPE pid_t
-#elif defined (HAVE_TERMIO) || defined (HAVE_SGTTY)
-# define PROCESS_GROUP_TYPE int
-#endif
-
-#ifdef PROCESS_GROUP_TYPE
 /* Process group of the current inferior.  */
-extern PROCESS_GROUP_TYPE inferior_process_group (void);
+#ifdef HAVE_TERMIOS_H
+extern pid_t inferior_process_group (void);
 #endif
 
 #endif /* inflow.h */
diff --git a/gdb/ser-base.c b/gdb/ser-base.c
index 2bfe82b..3262dcc 100644
--- a/gdb/ser-base.c
+++ b/gdb/ser-base.c
@@ -551,14 +551,6 @@ ser_base_set_tty_state (struct serial *scb, serial_ttystate ttystate)
   return 0;
 }
 
-int
-ser_base_noflush_set_tty_state (struct serial *scb,
-				serial_ttystate new_ttystate,
-				serial_ttystate old_ttystate)
-{
-  return 0;
-}
-
 void
 ser_base_print_tty_state (struct serial *scb, 
 			  serial_ttystate ttystate,
diff --git a/gdb/ser-base.h b/gdb/ser-base.h
index 964d640..ceeb7de 100644
--- a/gdb/ser-base.h
+++ b/gdb/ser-base.h
@@ -40,9 +40,6 @@ extern int ser_base_set_tty_state (struct serial *scb,
 extern void ser_base_print_tty_state (struct serial *scb,
 				      serial_ttystate ttystate,
 				      struct ui_file *stream);
-extern int ser_base_noflush_set_tty_state (struct serial *scb,
-					   serial_ttystate new_ttystate,
-					   serial_ttystate old_ttystate);
 extern int ser_base_setbaudrate (struct serial *scb, int rate);
 extern int ser_base_setstopbits (struct serial *scb, int num);
 extern int ser_base_setparity (struct serial *scb, int parity);
diff --git a/gdb/ser-event.c b/gdb/ser-event.c
index 08b56a3..8b88ca0 100644
--- a/gdb/ser-event.c
+++ b/gdb/ser-event.c
@@ -144,7 +144,6 @@ static const struct serial_ops serial_event_ops =
   NULL, /* copy_tty_state */
   NULL, /* set_tty_state */
   NULL, /* print_tty_state */
-  NULL, /* noflush_set_tty_state */
   NULL, /* setbaudrate */
   NULL, /* setstopbits */
   NULL, /* setparity */
diff --git a/gdb/ser-go32.c b/gdb/ser-go32.c
index e352895..6965f19 100644
--- a/gdb/ser-go32.c
+++ b/gdb/ser-go32.c
@@ -689,17 +689,6 @@ dos_set_tty_state (struct serial *scb, serial_ttystate ttystate)
 }
 
 static int
-dos_noflush_set_tty_state (struct serial *scb, serial_ttystate new_ttystate,
-			   serial_ttystate old_ttystate)
-{
-  struct dos_ttystate *state;
-
-  state = (struct dos_ttystate *) new_ttystate;
-  dos_setbaudrate (scb, state->baudrate);
-  return 0;
-}
-
-static int
 dos_flush_input (struct serial *scb)
 {
   struct dos_ttystate *port = &ports[scb->fd];
@@ -882,7 +871,6 @@ static const struct serial_ops dos_ops =
   dos_copy_tty_state,
   dos_set_tty_state,
   dos_print_tty_state,
-  dos_noflush_set_tty_state,
   dos_setbaudrate,
   dos_setstopbits,
   dos_setparity,
diff --git a/gdb/ser-mingw.c b/gdb/ser-mingw.c
index 33e4df3..2359a495 100644
--- a/gdb/ser-mingw.c
+++ b/gdb/ser-mingw.c
@@ -1248,7 +1248,6 @@ static const struct serial_ops hardwire_ops =
   ser_base_copy_tty_state,
   ser_base_set_tty_state,
   ser_base_print_tty_state,
-  ser_base_noflush_set_tty_state,
   ser_windows_setbaudrate,
   ser_windows_setstopbits,
   ser_windows_setparity,
@@ -1279,7 +1278,6 @@ static const struct serial_ops tty_ops =
   ser_base_copy_tty_state,
   ser_base_set_tty_state,
   ser_base_print_tty_state,
-  ser_base_noflush_set_tty_state,
   NULL,
   NULL,
   NULL,
@@ -1310,7 +1308,6 @@ static const struct serial_ops pipe_ops =
   ser_base_copy_tty_state,
   ser_base_set_tty_state,
   ser_base_print_tty_state,
-  ser_base_noflush_set_tty_state,
   ser_base_setbaudrate,
   ser_base_setstopbits,
   ser_base_setparity,
@@ -1341,7 +1338,6 @@ static const struct serial_ops tcp_ops =
   ser_base_copy_tty_state,
   ser_base_set_tty_state,
   ser_base_print_tty_state,
-  ser_base_noflush_set_tty_state,
   ser_base_setbaudrate,
   ser_base_setstopbits,
   ser_base_setparity,
diff --git a/gdb/ser-pipe.c b/gdb/ser-pipe.c
index cb94242..56a91fc 100644
--- a/gdb/ser-pipe.c
+++ b/gdb/ser-pipe.c
@@ -219,7 +219,6 @@ static const struct serial_ops pipe_ops =
   ser_base_copy_tty_state,
   ser_base_set_tty_state,
   ser_base_print_tty_state,
-  ser_base_noflush_set_tty_state,
   ser_base_setbaudrate,
   ser_base_setstopbits,
   ser_base_setparity,
diff --git a/gdb/ser-tcp.c b/gdb/ser-tcp.c
index 7ff588b..cc6de30 100644
--- a/gdb/ser-tcp.c
+++ b/gdb/ser-tcp.c
@@ -399,7 +399,6 @@ static const struct serial_ops tcp_ops =
   ser_base_copy_tty_state,
   ser_base_set_tty_state,
   ser_base_print_tty_state,
-  ser_base_noflush_set_tty_state,
   ser_base_setbaudrate,
   ser_base_setstopbits,
   ser_base_setparity,
diff --git a/gdb/ser-unix.c b/gdb/ser-unix.c
index 53c33e6..3cbb77f 100644
--- a/gdb/ser-unix.c
+++ b/gdb/ser-unix.c
@@ -31,9 +31,7 @@
 #include "gdb_select.h"
 #include "gdbcmd.h"
 #include "filestuff.h"
-#include "gdb_termios.h"
-
-#ifdef HAVE_TERMIOS
+#include <termios.h>
 
 struct hardwire_ttystate
   {
@@ -51,32 +49,6 @@ show_serial_hwflow (struct ui_file *file, int from_tty,
 }
 #endif
 
-#endif /* termios */
-
-#ifdef HAVE_TERMIO
-
-/* It is believed that all systems which have added job control to SVR3
-   (e.g. sco) have also added termios.  Even if not, trying to figure out
-   all the variations (TIOCGPGRP vs. TCGETPGRP, etc.) would be pretty
-   bewildering.  So we don't attempt it.  */
-
-struct hardwire_ttystate
-  {
-    struct termio termio;
-  };
-#endif /* termio */
-
-#ifdef HAVE_SGTTY
-struct hardwire_ttystate
-  {
-    struct sgttyb sgttyb;
-    struct tchars tc;
-    struct ltchars ltc;
-    /* Line discipline flags.  */
-    int lmode;
-  };
-#endif /* sgtty */
-
 static int hardwire_open (struct serial *scb, const char *name);
 static void hardwire_raw (struct serial *scb);
 static int rate_to_code (int rate);
@@ -89,8 +61,6 @@ static int set_tty_state (struct serial *scb,
 			  struct hardwire_ttystate * state);
 static serial_ttystate hardwire_get_tty_state (struct serial *scb);
 static int hardwire_set_tty_state (struct serial *scb, serial_ttystate state);
-static int hardwire_noflush_set_tty_state (struct serial *, serial_ttystate,
-					   serial_ttystate);
 static void hardwire_print_tty_state (struct serial *, serial_ttystate,
 				      struct ui_file *);
 static int hardwire_drain_output (struct serial *);
@@ -114,61 +84,19 @@ hardwire_open (struct serial *scb, const char *name)
 static int
 get_tty_state (struct serial *scb, struct hardwire_ttystate *state)
 {
-#ifdef HAVE_TERMIOS
   if (tcgetattr (scb->fd, &state->termios) < 0)
     return -1;
 
   return 0;
-#endif
-
-#ifdef HAVE_TERMIO
-  if (ioctl (scb->fd, TCGETA, &state->termio) < 0)
-    return -1;
-  return 0;
-#endif
-
-#ifdef HAVE_SGTTY
-  if (ioctl (scb->fd, TIOCGETP, &state->sgttyb) < 0)
-    return -1;
-  if (ioctl (scb->fd, TIOCGETC, &state->tc) < 0)
-    return -1;
-  if (ioctl (scb->fd, TIOCGLTC, &state->ltc) < 0)
-    return -1;
-  if (ioctl (scb->fd, TIOCLGET, &state->lmode) < 0)
-    return -1;
-
-  return 0;
-#endif
 }
 
 static int
 set_tty_state (struct serial *scb, struct hardwire_ttystate *state)
 {
-#ifdef HAVE_TERMIOS
   if (tcsetattr (scb->fd, TCSANOW, &state->termios) < 0)
     return -1;
 
   return 0;
-#endif
-
-#ifdef HAVE_TERMIO
-  if (ioctl (scb->fd, TCSETA, &state->termio) < 0)
-    return -1;
-  return 0;
-#endif
-
-#ifdef HAVE_SGTTY
-  if (ioctl (scb->fd, TIOCSETN, &state->sgttyb) < 0)
-    return -1;
-  if (ioctl (scb->fd, TIOCSETC, &state->tc) < 0)
-    return -1;
-  if (ioctl (scb->fd, TIOCSLTC, &state->ltc) < 0)
-    return -1;
-  if (ioctl (scb->fd, TIOCLSET, &state->lmode) < 0)
-    return -1;
-
-  return 0;
-#endif
 }
 
 static serial_ttystate
@@ -205,39 +133,6 @@ hardwire_set_tty_state (struct serial *scb, serial_ttystate ttystate)
   return set_tty_state (scb, state);
 }
 
-static int
-hardwire_noflush_set_tty_state (struct serial *scb,
-				serial_ttystate new_ttystate,
-				serial_ttystate old_ttystate)
-{
-  struct hardwire_ttystate new_state;
-#ifdef HAVE_SGTTY
-  struct hardwire_ttystate *state = (struct hardwire_ttystate *) old_ttystate;
-#endif
-
-  new_state = *(struct hardwire_ttystate *) new_ttystate;
-
-  /* Don't change in or out of raw mode; we don't want to flush input.
-     termio and termios have no such restriction; for them flushing input
-     is separate from setting the attributes.  */
-
-#ifdef HAVE_SGTTY
-  if (state->sgttyb.sg_flags & RAW)
-    new_state.sgttyb.sg_flags |= RAW;
-  else
-    new_state.sgttyb.sg_flags &= ~RAW;
-
-  /* I'm not sure whether this is necessary; the manpage just mentions
-     RAW not CBREAK.  */
-  if (state->sgttyb.sg_flags & CBREAK)
-    new_state.sgttyb.sg_flags |= CBREAK;
-  else
-    new_state.sgttyb.sg_flags &= ~CBREAK;
-#endif
-
-  return set_tty_state (scb, &new_state);
-}
-
 static void
 hardwire_print_tty_state (struct serial *scb,
 			  serial_ttystate ttystate,
@@ -246,7 +141,6 @@ hardwire_print_tty_state (struct serial *scb,
   struct hardwire_ttystate *state = (struct hardwire_ttystate *) ttystate;
   int i;
 
-#ifdef HAVE_TERMIOS
   fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",
 		    (int) state->termios.c_iflag,
 		    (int) state->termios.c_oflag);
@@ -262,36 +156,6 @@ hardwire_print_tty_state (struct serial *scb,
   for (i = 0; i < NCCS; i += 1)
     fprintf_filtered (stream, "0x%x ", state->termios.c_cc[i]);
   fprintf_filtered (stream, "\n");
-#endif
-
-#ifdef HAVE_TERMIO
-  fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",
-		    state->termio.c_iflag, state->termio.c_oflag);
-  fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n",
-		    state->termio.c_cflag, state->termio.c_lflag,
-		    state->termio.c_line);
-  fprintf_filtered (stream, "c_cc: ");
-  for (i = 0; i < NCC; i += 1)
-    fprintf_filtered (stream, "0x%x ", state->termio.c_cc[i]);
-  fprintf_filtered (stream, "\n");
-#endif
-
-#ifdef HAVE_SGTTY
-  fprintf_filtered (stream, "sgttyb.sg_flags = 0x%x.\n",
-		    state->sgttyb.sg_flags);
-
-  fprintf_filtered (stream, "tchars: ");
-  for (i = 0; i < (int) sizeof (struct tchars); i++)
-    fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->tc)[i]);
-  fprintf_filtered (stream, "\n");
-
-  fprintf_filtered (stream, "ltchars: ");
-  for (i = 0; i < (int) sizeof (struct ltchars); i++)
-    fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->ltc)[i]);
-  fprintf_filtered (stream, "\n");
-
-  fprintf_filtered (stream, "lmode:  0x%x\n", state->lmode);
-#endif
 }
 
 /* Wait for the output to drain away, as opposed to flushing
@@ -300,48 +164,13 @@ hardwire_print_tty_state (struct serial *scb,
 static int
 hardwire_drain_output (struct serial *scb)
 {
-#ifdef HAVE_TERMIOS
   return tcdrain (scb->fd);
-#endif
-
-#ifdef HAVE_TERMIO
-  return ioctl (scb->fd, TCSBRK, 1);
-#endif
-
-#ifdef HAVE_SGTTY
-  /* Get the current state and then restore it using TIOCSETP,
-     which should cause the output to drain and pending input
-     to be discarded.  */
-  {
-    struct hardwire_ttystate state;
-
-    if (get_tty_state (scb, &state))
-      {
-	return (-1);
-      }
-    else
-      {
-	return (ioctl (scb->fd, TIOCSETP, &state.sgttyb));
-      }
-  }
-#endif
 }
 
 static int
 hardwire_flush_output (struct serial *scb)
 {
-#ifdef HAVE_TERMIOS
   return tcflush (scb->fd, TCOFLUSH);
-#endif
-
-#ifdef HAVE_TERMIO
-  return ioctl (scb->fd, TCFLSH, 1);
-#endif
-
-#ifdef HAVE_SGTTY
-  /* This flushes both input and output, but we can't do better.  */
-  return ioctl (scb->fd, TIOCFLUSH, 0);
-#endif
 }
 
 static int
@@ -349,45 +178,13 @@ hardwire_flush_input (struct serial *scb)
 {
   ser_base_flush_input (scb);
 
-#ifdef HAVE_TERMIOS
   return tcflush (scb->fd, TCIFLUSH);
-#endif
-
-#ifdef HAVE_TERMIO
-  return ioctl (scb->fd, TCFLSH, 0);
-#endif
-
-#ifdef HAVE_SGTTY
-  /* This flushes both input and output, but we can't do better.  */
-  return ioctl (scb->fd, TIOCFLUSH, 0);
-#endif
 }
 
 static int
 hardwire_send_break (struct serial *scb)
 {
-#ifdef HAVE_TERMIOS
   return tcsendbreak (scb->fd, 0);
-#endif
-
-#ifdef HAVE_TERMIO
-  return ioctl (scb->fd, TCSBRK, 0);
-#endif
-
-#ifdef HAVE_SGTTY
-  {
-    int status;
-
-    status = ioctl (scb->fd, TIOCSBRK, 0);
-
-    /* Can't use usleep; it doesn't exist in BSD 4.2.  */
-    /* Note that if this gdb_select() is interrupted by a signal it will not
-       wait the full length of time.  I think that is OK.  */
-    gdb_usleep (250000);
-    status = ioctl (scb->fd, TIOCCBRK, 0);
-    return status;
-  }
-#endif
 }
 
 static void
@@ -399,7 +196,6 @@ hardwire_raw (struct serial *scb)
     fprintf_unfiltered (gdb_stderr, "get_tty_state failed: %s\n",
 			safe_strerror (errno));
 
-#ifdef HAVE_TERMIOS
   state.termios.c_iflag = 0;
   state.termios.c_oflag = 0;
   state.termios.c_lflag = 0;
@@ -420,22 +216,6 @@ hardwire_raw (struct serial *scb)
 #endif
   state.termios.c_cc[VMIN] = 0;
   state.termios.c_cc[VTIME] = 0;
-#endif
-
-#ifdef HAVE_TERMIO
-  state.termio.c_iflag = 0;
-  state.termio.c_oflag = 0;
-  state.termio.c_lflag = 0;
-  state.termio.c_cflag &= ~CSIZE;
-  state.termio.c_cflag |= CLOCAL | CS8;
-  state.termio.c_cc[VMIN] = 0;
-  state.termio.c_cc[VTIME] = 0;
-#endif
-
-#ifdef HAVE_SGTTY
-  state.sgttyb.sg_flags |= RAW | ANYP;
-  state.sgttyb.sg_flags &= ~(CBREAK | ECHO);
-#endif
 
   if (set_tty_state (scb, &state))
     fprintf_unfiltered (gdb_stderr, "set_tty_state failed: %s\n",
@@ -604,24 +384,8 @@ hardwire_setbaudrate (struct serial *scb, int rate)
   if (get_tty_state (scb, &state))
     return -1;
 
-#ifdef HAVE_TERMIOS
   cfsetospeed (&state.termios, baud_code);
   cfsetispeed (&state.termios, baud_code);
-#endif
-
-#ifdef HAVE_TERMIO
-#ifndef CIBAUD
-#define CIBAUD CBAUD
-#endif
-
-  state.termio.c_cflag &= ~(CBAUD | CIBAUD);
-  state.termio.c_cflag |= baud_code;
-#endif
-
-#ifdef HAVE_SGTTY
-  state.sgttyb.sg_ispeed = baud_code;
-  state.sgttyb.sg_ospeed = baud_code;
-#endif
 
   return set_tty_state (scb, &state);
 }
@@ -648,23 +412,10 @@ hardwire_setstopbits (struct serial *scb, int num)
       return 1;
     }
 
-#ifdef HAVE_TERMIOS
   if (!newbit)
     state.termios.c_cflag &= ~CSTOPB;
   else
     state.termios.c_cflag |= CSTOPB;	/* two bits */
-#endif
-
-#ifdef HAVE_TERMIO
-  if (!newbit)
-    state.termio.c_cflag &= ~CSTOPB;
-  else
-    state.termio.c_cflag |= CSTOPB;	/* two bits */
-#endif
-
-#ifdef HAVE_SGTTY
-  return 0;			/* sgtty doesn't support this */
-#endif
 
   return set_tty_state (scb, &state);
 }
@@ -697,19 +448,9 @@ hardwire_setparity (struct serial *scb, int parity)
       return -1;
     }
 
-#ifdef HAVE_TERMIOS
   state.termios.c_cflag &= ~(PARENB | PARODD);
   state.termios.c_cflag |= newparity;
-#endif
 
-#ifdef HAVE_TERMIO
-  state.termio.c_cflag &= ~(PARENB | PARODD);
-  state.termio.c_cflag |= newparity;
-#endif
-
-#ifdef HAVE_SGTTY
-  return 0;            /* sgtty doesn't support this */
-#endif
   return set_tty_state (scb, &state);
 }
 
@@ -744,7 +485,6 @@ static const struct serial_ops hardwire_ops =
   hardwire_copy_tty_state,
   hardwire_set_tty_state,
   hardwire_print_tty_state,
-  hardwire_noflush_set_tty_state,
   hardwire_setbaudrate,
   hardwire_setstopbits,
   hardwire_setparity,
@@ -759,7 +499,6 @@ _initialize_ser_hardwire (void)
 {
   serial_add_interface (&hardwire_ops);
 
-#ifdef HAVE_TERMIOS
 #ifdef CRTSCTS
   add_setshow_boolean_cmd ("remoteflow", no_class,
 			   &serial_hwflow, _("\
@@ -771,7 +510,6 @@ when debugging using remote targets."),
 			   show_serial_hwflow,
 			   &setlist, &showlist);
 #endif
-#endif
 }
 
 int
diff --git a/gdb/serial.c b/gdb/serial.c
index 6866549..32d4f5a 100644
--- a/gdb/serial.c
+++ b/gdb/serial.c
@@ -514,14 +514,6 @@ serial_print_tty_state (struct serial *scb,
 }
 
 int
-serial_noflush_set_tty_state (struct serial *scb,
-			      serial_ttystate new_ttystate,
-			      serial_ttystate old_ttystate)
-{
-  return scb->ops->noflush_set_tty_state (scb, new_ttystate, old_ttystate);
-}
-
-int
 serial_setbaudrate (struct serial *scb, int rate)
 {
   return scb->ops->setbaudrate (scb, rate);
diff --git a/gdb/serial.h b/gdb/serial.h
index c76ddbe..647eab3 100644
--- a/gdb/serial.h
+++ b/gdb/serial.h
@@ -169,16 +169,6 @@ extern void serial_print_tty_state (struct serial *scb,
 				    serial_ttystate ttystate,
 				    struct ui_file *);
 
-/* Set the tty state to NEW_TTYSTATE, where OLD_TTYSTATE is the
-   current state (generally obtained from a recent call to
-   serial_get_tty_state()), but be careful not to discard any input.
-   This means that we never switch in or out of raw mode, even if
-   NEW_TTYSTATE specifies a switch.  */
-
-extern int serial_noflush_set_tty_state (struct serial *scb,
-					 serial_ttystate new_ttystate,
-					 serial_ttystate old_ttystate);
-
 /* Set the baudrate to the decimal value supplied.  Returns 0 for
    success, -1 for failure.  */
 
@@ -276,8 +266,6 @@ struct serial_ops
     int (*set_tty_state) (struct serial *, serial_ttystate);
     void (*print_tty_state) (struct serial *, serial_ttystate,
 			     struct ui_file *);
-    int (*noflush_set_tty_state) (struct serial *, serial_ttystate,
-				  serial_ttystate);
     int (*setbaudrate) (struct serial *, int rate);
     int (*setstopbits) (struct serial *, int num);
     /* Set the value PARITY as parity setting for serial object.
