termios: Consolidate Input Modes definitions.

This patch consolidates the termios symbolic constants used for input
modes with c_iflag member on its own header.  The Linux generic implementation
values match the kernel UAPI and each architecture with deviate values
have their own implementation (in this case alpha and powerpc).

No semantic change is expected, checked on a build against x86_64-linux-gnu,
alpha-linux-gnu, mips64-linux-gnu, and sparc64-linux-gnu.

	* sysdeps/unix/sysv/linux/Makefile (sysdeps_headers): Add
	termios-c_iflag.h.
	* sysdeps/unix/sysv/linux/bits/termios-c_iflag.h: New file.
	* sysdeps/unix/sysv/linux/alpha/bits/termios-c_iflag.h: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/bits/termios-c_iflag.h: Likewise.
	* sysdeps/unix/sysv/linux/bits/termios.h (IGNBRK, BRKINT, IGNPAR, PARMRK,
	INPCK, ISTRIP, INLCR, IGNCR, ICRNL, IXON, IXOFF, IXANY, IUCLC, IMAXBEL,
	IUTF8): Move to termios-c_iflag.h.
	* sysdeps/unix/sysv/linux/alpha/bits/termios.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/bits/termios.h: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/bits/termios.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/termios.h: Likewise.

2 files changed, 41 insertions, 17 deletions

diff --git a/sysdeps/unix/sysv/linux/bits/termios-c_iflag.h b/sysdeps/unix/sysv/linux/bits/termios-c_iflag.h
new file mode 100644
index 0000000000..519dc1fec9
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/bits/termios-c_iflag.h
@@ -0,0 +1,40 @@
+/* termios input mode definitions.  Linux/generic version.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _TERMIOS_H
+# error "Never include <bits/termios-ciflags.h> directly; use <termios.h> instead."
+#endif
+
+/* c_iflag bits */
+#define IGNBRK	0000001  /* Ignore break condition.  */
+#define BRKINT	0000002  /* Signal interrupt on break.  */
+#define IGNPAR	0000004  /* Ignore characters with parity errors.  */
+#define PARMRK	0000010  /* Mark parity and framing errors.  */
+#define INPCK	0000020  /* Enable input parity check.  */
+#define ISTRIP	0000040  /* Strip 8th bit off characters.  */
+#define INLCR	0000100  /* Map NL to CR on input.  */
+#define IGNCR	0000200  /* Ignore CR.  */
+#define ICRNL	0000400  /* Map CR to NL on input.  */
+#define IUCLC	0001000  /* Map uppercase characters to lowercase on input
+			    (not in POSIX).  */
+#define IXON	0002000  /* Enable start/stop output control.  */
+#define IXANY	0004000  /* Enable any character to restart output.  */
+#define IXOFF	0010000  /* Enable start/stop input control.  */
+#define IMAXBEL	0020000  /* Ring bell when input queue is full
+			    (not in POSIX).  */
+#define IUTF8	0040000  /* Input is UTF8 (not in POSIX).  */
diff --git a/sysdeps/unix/sysv/linux/bits/termios.h b/sysdeps/unix/sysv/linux/bits/termios.h
index f80ae9d479..c4e8fede5c 100644
--- a/sysdeps/unix/sysv/linux/bits/termios.h
+++ b/sysdeps/unix/sysv/linux/bits/termios.h
@@ -26,23 +26,7 @@ typedef unsigned int	tcflag_t;
 
 #include <bits/termios-struct.h>
 #include <bits/termios-c_cc.h>
-
-/* c_iflag bits */
-#define IGNBRK	0000001
-#define BRKINT	0000002
-#define IGNPAR	0000004
-#define PARMRK	0000010
-#define INPCK	0000020
-#define ISTRIP	0000040
-#define INLCR	0000100
-#define IGNCR	0000200
-#define ICRNL	0000400
-#define IUCLC	0001000
-#define IXON	0002000
-#define IXANY	0004000
-#define IXOFF	0010000
-#define IMAXBEL	0020000
-#define IUTF8	0040000
+#include <bits/termios-c_iflag.h>
 
 /* c_oflag bits */
 #define OPOST	0000001