windows: Provide a poll(2) wrapper calling WSAPoll()

src/libstrongswan/utils/utils.h

@@ -37,6 +37,7 @@
 # include <netdb.h>
 # include <netinet/in.h>
 # include <sched.h>
+# include <poll.h>
 #endif
 
 /**

src/libstrongswan/utils/windows.c

@@ -13,6 +13,9 @@
  * for more details.
  */
 
+/* WSAPoll() */
+#define _WIN32_WINNT 0x0600
+
 #include "utils.h"
 
 #include <errno.h>
@@ -639,3 +642,11 @@ ssize_t windows_sendto(int sockfd, const void *buf, size_t len, int flags,
 	}
 	return outlen;
 }
+
+/**
+ * See header
+ */
+int poll(struct pollfd *fds, int nfds, int timeout)
+{
+	return wserr(WSAPoll(fds, nfds, timeout));
+}

src/libstrongswan/utils/windows.h

@@ -362,6 +362,34 @@ ssize_t windows_send(int sockfd, const void *buf, size_t len, int flags);
 ssize_t windows_sendto(int sockfd, const void *buf, size_t len, int flags,
 					   const struct sockaddr *dest_addr, socklen_t addrlen);
 
+#if _WIN32_WINNT < 0x0600
+/**
+ * Define pollfd and flags on our own if not specified
+ */
+struct pollfd {
+	SOCKET fd;
+	short events;
+	short revents;
+};
+enum {
+	POLLERR =		0x0001,
+	POLLHUP =		0x0002,
+	POLLNVAL =		0x0004,
+	POLLWRNORM =	0x0010,
+	POLLWRBAND =	0x0020,
+	POLLPRI =		0x0400,
+	POLLRDNORM =	0x0100,
+	POLLRDBAND =	0x0200,
+	POLLIN =		POLLRDNORM | POLLRDBAND,
+	POLLOUT =		POLLWRNORM,
+};
+#endif /* _WIN32_WINNT < 0x0600 */
+
+/**
+ * poll(2), implemented using Winsock2 WSAPoll()
+ */
+int poll(struct pollfd *fds, int nfds, int timeout);
+
 /**
  * Declaration missing on older WinGW
  */