x/sys/unix: add type specific ioctl functions for termios on solaris

The existing code has no way to manipulate termios or winsize structures
on solaris.  This change adds IoctlGetXXX and IoctlSetXXX functions for
int, termios, termio, and winsize.  The embedded awk script in
mkerrors.sh has additional patterns to generate the needed ioctl
constants for these calls.

Fixes golang/go#12574

Change-Id: Ic62a8c698d42c8ca379c90f71e9f27635e7d03b5
Reviewed-on: https://go-review.googlesource.com/14587
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Aram Hăvărneanu <aram@mgk.ro>

unix/syscall_solaris.go

@@ -515,6 +515,52 @@ func Acct(path string) (err error) {
 	return acct(pathp)
 }
 
+/*
+ * Expose the ioctl function
+ */
+
+//sys	ioctl(fd int, req int, arg uintptr) (err error)
+
+func IoctlSetInt(fd int, req int, value int) (err error) {
+	return ioctl(fd, req, uintptr(value))
+}
+
+func IoctlSetWinsize(fd int, req int, value *Winsize) (err error) {
+	return ioctl(fd, req, uintptr(unsafe.Pointer(value)))
+}
+
+func IoctlSetTermios(fd int, req int, value *Termios) (err error) {
+	return ioctl(fd, req, uintptr(unsafe.Pointer(value)))
+}
+
+func IoctlSetTermio(fd int, req int, value *Termio) (err error) {
+	return ioctl(fd, req, uintptr(unsafe.Pointer(value)))
+}
+
+func IoctlGetInt(fd int, req int) (int, error) {
+	var value int
+	err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
+	return value, err
+}
+
+func IoctlGetWinsize(fd int, req int) (*Winsize, error) {
+	var value Winsize
+	err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
+	return &value, err
+}
+
+func IoctlGetTermios(fd int, req int) (*Termios, error) {
+	var value Termios
+	err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
+	return &value, err
+}
+
+func IoctlGetTermio(fd int, req int) (*Termio, error) {
+	var value Termio
+	err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
+	return &value, err
+}
+
 /*
  * Exposed directly
  */