Emulate POSIX_SIGNALS on MS-Windows.

 w32.c (sigemptyset, sigaddset, sigfillset, sigprocmask): New stubs.
 sysdep.c (sys_signal) [WINDOWSNT]: #ifdef away.
 (wait_for_termination) [WINDOWSNT]: Move MS-Windows specific code
 from non-POSIX_SIGNALS section to POSIX_SIGNALS section.
 s/ms-w32.h (POSIX_SIGNALS, struct sigaction, SIG_BLOCK)
 (SIG_SETMASK, SIG_UNBLOCK): Define.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/s/ms-w32.h b/src/s/ms-w32.h
index 66aae334b3f..74e91c1e816 100644
--- a/src/s/ms-w32.h
+++ b/src/s/ms-w32.h
@@ -123,6 +123,18 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #define IS_DIRECTORY_SEP(_c_) ((_c_) == '/' || (_c_) == '\\')
 #define IS_ANY_SEP(_c_) (IS_DIRECTORY_SEP (_c_) || IS_DEVICE_SEP (_c_))
 
+/* Do we have POSIX signals?  (We don't, but we don't care, either.)  */
+#define POSIX_SIGNALS  1
+#include <sys/types.h>
+struct sigaction {
+  int sa_flags;
+  void (*sa_handler)(int);
+  sigset_t sa_mask;
+};
+#define SIG_BLOCK       1
+#define SIG_SETMASK     2
+#define SIG_UNBLOCK     3
+
 /* The null device on Windows NT. */
 #define NULL_DEVICE     "NUL:"