[PATCH v4 1/5] Share parts of gdb/terminal.h with gdbserver

[Sergio Durigan Junior <sergiodj@redhat.com>]

As part of the bigger work of sharing fork_inferior with gdbserver,
some parts of gdb/terminal.h also needed to be moved to a common
place.  These parts are:

- The code responsible for determining some terminal-based define's
  based on available features;

- terminal-related functions needed by fork_inferior;

gdb/ChangeLog:
yyyy-mm-dd  Sergio Durigan Junior  <sergiodj@redhat.com>

	* Makefile.in (HFILES_NO_SRCDIR): Add "common/common-terminal.h".
	* common/common-terminal.h: New file, with parts of "terminal.h".
	* common/common.m4: Check headers 'termios.h', 'termio.h' and
	'sgtty.h'.
	* terminal.h: Move terminal-related defines to
	"common/common-terminal.h".  Include "common/common-terminal.h".
	(new_tty_prefork): Move to "common/common-terminal.h".
	(new_tty): Likewise.
	(new_tty_postfork): Likewise.
	(create_tty_session): Likewise.
	(gdb_setpgid): Likewise.
	* utils.c: Include "terminal.h".

gdb/gdbserver/ChangeLog:
yyyy-mm-dd  Sergio Durigan Junior  <sergiodj@redhat.com>

	* terminal.c: New file.
---
 gdb/Makefile.in              |   1 +
 gdb/common/common-terminal.h | 116 +++++++++++++++++++++++++++++++++++++++++++
 gdb/common/common.m4         |   3 +-
 gdb/gdbserver/terminal.c     |  69 +++++++++++++++++++++++++
 gdb/terminal.h               |  73 +--------------------------
 gdb/utils.c                  |   1 +
 6 files changed, 190 insertions(+), 73 deletions(-)
 create mode 100644 gdb/common/common-terminal.h
 create mode 100644 gdb/gdbserver/terminal.c

diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 0818742..177c853 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -1484,6 +1484,7 @@ HFILES_NO_SRCDIR = \
 	common/common-regcache.h \
 	common/common-types.h \
 	common/common-utils.h \
+	common/common-terminal.h \
 	common/errors.h \
 	common/environ.h \
 	common/fileio.h \
diff --git a/gdb/common/common-terminal.h b/gdb/common/common-terminal.h
new file mode 100644
index 0000000..87a19f0
--- /dev/null
+++ b/gdb/common/common-terminal.h
@@ -0,0 +1,116 @@
+/* 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 COMMON_TERMINAL_H
+#define COMMON_TERMINAL_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
+
+#include <sys/types.h>
+
+extern void new_tty (void);
+
+/* NEW_TTY_PREFORK is called before forking a new child process,
+   so we can record the state of ttys in the child to be formed.
+   TTYNAME is null if we are to share the terminal with gdb;
+   or points to a string containing the name of the desired tty.
+
+   NEW_TTY is called in new child processes under Unix, which will
+   become debugger target processes.  This actually switches to
+   the terminal specified in the NEW_TTY_PREFORK call.
+   
+   This function is implemented as a placeholder on GDBserver.  */
+extern void new_tty_prefork (const char *ttyname);
+
+/* NEW_TTY_POSTFORK is called after forking a new child process, and
+   adding it to the inferior table, to store the TTYNAME being used by
+   the child, or null if it sharing the terminal with gdb.
+
+   This function is implemented as a placeholder on GDBserver.  */
+extern void new_tty_postfork (void);
+
+/* Create a new session if the inferior will run in a different tty.
+   A session is UNIX's way of grouping processes that share a controlling
+   terminal, so a new one is needed if the inferior terminal will be
+   different from GDB's.
+
+   Returns the session id of the new session, 0 if no session was created
+   or -1 if an error occurred.
+
+   This function is implemented as a placeholder on GDBserver.  */
+extern pid_t create_tty_session (void);
+
+/* Set the process group of the caller to its own pid, or do nothing
+   if we lack job control.  */
+extern int gdb_setpgid (void);
+
+#endif /* ! COMMON_TERMINAL_H */
diff --git a/gdb/common/common.m4 b/gdb/common/common.m4
index e21e6e5..45726ab 100644
--- a/gdb/common/common.m4
+++ b/gdb/common/common.m4
@@ -28,7 +28,8 @@ AC_DEFUN([GDB_AC_COMMON], [
   AC_CHECK_HEADERS(linux/perf_event.h locale.h memory.h signal.h dnl
 		   sys/resource.h sys/socket.h sys/syscall.h dnl
 		   sys/un.h sys/wait.h dnl
-		   thread_db.h wait.h)
+		   thread_db.h wait.h dnl
+		   termios.h termio.h sgtty.h)
 
   AC_CHECK_FUNCS([fdwalk getrlimit pipe pipe2 socketpair sigaction])
 
diff --git a/gdb/gdbserver/terminal.c b/gdb/gdbserver/terminal.c
new file mode 100644
index 0000000..fb06209
--- /dev/null
+++ b/gdb/gdbserver/terminal.c
@@ -0,0 +1,69 @@
+/* Terminal interface definitions for the GDB remote server.
+   Copyright (C) 2016-2017 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/>.  */
+
+#include "server.h"
+#include "common-terminal.h"
+
+/* Placeholders needed by fork_inferior.  For now, these functions are
+   not needed nor useful to have on gdbserver.  When/If we properly
+   handle terminal modes, we can revisit and implement the needed
+   support.  */
+
+/* See common/common-terminal.h.  */
+
+void
+new_tty (void)
+{
+}
+
+/* See common/common-terminal.h.  */
+
+void
+new_tty_prefork (const char *ttyname)
+{
+}
+
+/* See common/common-terminal.h.  */
+
+void
+new_tty_postfork (void)
+{
+}
+
+/* See common/common-terminal.h.  */
+
+pid_t
+create_tty_session (void)
+{
+  return (pid_t) 0;
+}
+
+/* See common/common-inferior.h.  */
+
+void
+set_inferior_io_terminal (const char *terminal_name)
+{
+}
+
+/* See common/common-inferior.h.  */
+
+const char *
+get_inferior_io_terminal (void)
+{
+  return NULL;
+}
diff --git a/gdb/terminal.h b/gdb/terminal.h
index d8691b2..438eb40 100644
--- a/gdb/terminal.h
+++ b/gdb/terminal.h
@@ -19,83 +19,16 @@
 #if !defined (TERMINAL_H)
 #define TERMINAL_H 1
 
-
-/* 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
+#include "common-terminal.h"
 
 struct inferior;
 
-extern void new_tty_prefork (const char *);
-
-extern void new_tty (void);
-
-extern void new_tty_postfork (void);
-
 extern void copy_terminal_info (struct inferior *to, struct inferior *from);
 
 /* Do we have job control?  Can be assumed to always be the same within
    a given run of GDB.  In inflow.c.  */
 extern int job_control;
 
-extern pid_t create_tty_session (void);
-
-/* Set the process group of the caller to its own pid, or do nothing if
-   we lack job control.  */
-extern int gdb_setpgid (void);
-
 /* Set up a serial structure describing standard input.  In inflow.c.  */
 extern void initialize_stdin_serial (void);
 
@@ -105,8 +38,4 @@ extern void gdb_save_tty_state (void);
    have had a chance to alter it.  */
 extern void set_initial_gdb_ttystate (void);
 
-/* Set the process group of the caller to its own pid, or do nothing
-   if we lack job control.  */
-extern int gdb_setpgid (void);
-
 #endif /* !defined (TERMINAL_H) */
diff --git a/gdb/utils.c b/gdb/utils.c
index 27021a1..fdb983a 100644
--- a/gdb/utils.c
+++ b/gdb/utils.c
@@ -53,6 +53,7 @@
 #include "top.h"
 #include "main.h"
 #include "solist.h"
+#include "terminal.h"
 
 #include "inferior.h"		/* for signed_pointer_to_address */
 
-- 
2.9.3