[PATCH v2] ioctl_tty.2: Fix information about header include file

["Pali Rohár via Libc-alpha" <libc-alpha@sourceware.org>]

Header file termios.h contains incompatible definitions for linux ioctl
calls. Correct definitions are exported by header file linux/termios.h but
this file conflicts with sys/ioctl.h header file (required for ioctl()
call). Therefore include direct asm header file asm/termbits.h which
contains compatible definitions and structures for ioctl calls.

Signed-off-by: Pali Rohár <pali@kernel.org>

---
Changes in v2:
* Reformat SYNOPSIS for 80 chars per line
---
 man2/ioctl_tty.2 | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/man2/ioctl_tty.2 b/man2/ioctl_tty.2
index 771a9a470bf0..ecbae4f887c4 100644
--- a/man2/ioctl_tty.2
+++ b/man2/ioctl_tty.2
@@ -11,8 +11,10 @@ ioctl_tty \- ioctls for terminals and serial lines
 .SH SYNOPSIS
 .nf
 .B #include <sys/ioctl.h>
-.BR "#include <termios.h>" "      /* Definition of " CLOCAL ", and"
-.BR    "                             TC*" { FLUSH , ON , OFF "} constants */"
+.BR "#include <asm/termbits.h>" "   /* Definition of " "struct termios" ,
+.BR    "                               struct termios2" ", and"
+.BR    "                               Bnn" ", " BOTHER ", " CBAUD ", " CLOCAL ,
+.BR    "                               TC*" { FLUSH , ON , OFF "} and other constants */"
 .PP
 .BI "int ioctl(int " fd ", int " cmd ", ...);"
 .fi
@@ -31,6 +33,19 @@ makes for nonportable programs.
 Use the POSIX interface described in
 .BR termios (3)
 whenever possible.
+.PP
+Please note that
+.B struct termios
+from
+.B #include <asm/termbits.h>
+is different and incompatible with
+.B struct termios
+from
+.BR "#include <termios.h>" .
+These ioctl calls require
+.B struct termios
+from
+.BR "#include <asm/termbits.h>" .
 .SS Get and set terminal attributes
 .TP
 .B TCGETS
-- 
2.20.1