Cygwin: Add new APIs tc[gs]etwinsize()

New APIs tcgetwinsize/tcsetwinsize are added, which is added in
POSIX.1-2024.

Reviewed-by: Corinna Vinschen <corinna@vinschen.de>
Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>

winsup/cygwin/cygwin.din

@@ -1530,9 +1530,11 @@ tcflush SIGFE
 tcgetattr SIGFE
 tcgetpgrp SIGFE
 tcgetsid SIGFE
+tcgetwinsize SIGFE
 tcsendbreak SIGFE
 tcsetattr SIGFE
 tcsetpgrp SIGFE
+tcsetwinsize SIGFE
 tdelete SIGFE
 tdestroy NOSIGFE
 telldir SIGFE

winsup/cygwin/fhandler/base.cc

@@ -1333,6 +1333,8 @@ fhandler_base::ioctl (unsigned int cmd, void *buf)
       break;
     case FIONREAD:
     case TIOCSCTTY:
+    case TIOCGWINSZ:
+    case TIOCSWINSZ:
       set_errno (ENOTTY);
       res = -1;
       break;

winsup/cygwin/include/sys/termios.h

@@ -301,6 +301,8 @@ speed_t cfgetospeed(const struct termios *);
 int cfsetispeed (struct termios *, speed_t);
 int cfsetospeed (struct termios *, speed_t);
 int cfsetspeed (struct termios *, speed_t);
+int tcgetwinsize(int fd, const struct winsize *winsz);
+int tcsetwinsize(int fd, const struct winsize *winsz);
 
 #ifdef __cplusplus
 }

winsup/cygwin/release/3.6.0

@@ -9,6 +9,8 @@ What's new:
 
 - New API call: timespec_get.
 
+- New API calls: tcgetwinsize, tcsetwinsize.
+
 - New POSIX-defined entry points posix_spawn_file_actions_addchdir and
   posix_spawn_file_actions_addfchdir.  These are the same as the already
   exported posix_spawn_file_actions_addchdir_np and

winsup/cygwin/termios.cc

@@ -398,3 +398,15 @@ cfmakeraw(struct termios *tp)
   tp->c_cflag &= ~(CSIZE | PARENB);
   tp->c_cflag |= CS8;
 }
+
+extern "C" int
+tcgetwinsize (int fd, const struct winsize *winsz)
+{
+  return ioctl (fd, TIOCGWINSZ, winsz);
+}
+
+extern "C" int
+tcsetwinsize (int fd, const struct winsize *winsz)
+{
+  return ioctl (fd, TIOCSWINSZ, winsz);
+}

winsup/doc/new-features.xml

@@ -4,6 +4,18 @@
 
 <sect1 id="ov-new"><title>What's new and what changed in Cygwin</title>
 
+<sect2 id="ov-new3.6"><title>What's new and what changed in 3.6</title>
+
+<itemizedlist mark="bullet">
+
+<listitem><para>
+New API calls: tcgetwinsize, tcsetwinsize.
+</para></listitem>
+
+</itemizedlist>
+
+</sect2>
+
 <sect2 id="ov-new3.5"><title>What's new and what changed in 3.5</title>
 
 <itemizedlist mark="bullet">

winsup/doc/posix.xml

@@ -990,9 +990,11 @@ also IEEE Std 1003.1-2017 (POSIX.1-2017).</para>
     tcgetattr
     tcgetpgrp
     tcgetsid
+    tcgetwinsize
     tcsendbreak
     tcsetattr
     tcsetpgrp
+    tcsetwinsize
     tdelete
     telldir
     tempnam