Add support for getpagesize

crypto/CMakeLists.txt

@@ -681,6 +681,10 @@ if(NOT HAVE_ASPRINTF)
 	set(EXTRA_EXPORT ${EXTRA_EXPORT} vasprintf)
 endif()
 
+if(NOT HAVE_GETPAGESIZE)
+	set(CRYPTO_SRC ${CRYPTO_SRC} compat/getpagesize.c)
+endif()
+
 if(NOT HAVE_INET_PTON)
 	set(CRYPTO_SRC ${CRYPTO_SRC} compat/inet_pton.c)
 	set(EXTRA_EXPORT ${EXTRA_EXPORT} inet_pton)

crypto/Makefile.am

@@ -81,6 +81,10 @@ if !HAVE_ASPRINTF
 libcompat_la_SOURCES += compat/bsd-asprintf.c
 endif
 
+if !HAVE_GETPAGESIZE
+libcompat_la_SOURCES += compat/getpagesize.c
+endif
+
 if !HAVE_INET_PTON
 libcompat_la_SOURCES += compat/inet_pton.c
 endif

crypto/compat/getpagesize.c

@@ -0,0 +1,18 @@
+/* $OpenBSD$ */
+
+#include <unistd.h>
+
+#ifdef _MSC_VER
+#include <windows.h>
+#endif
+
+int
+getpagesize(void) {
+#ifdef _MSC_VER
+	SYSTEM_INFO system_info;
+	GetSystemInfo(&system_info);
+	return system_info.dwPageSize;
+#else
+	return sysconf(_SC_PAGESIZE);
+#endif
+}