1 files changed, 61 insertions, 0 deletions
diff --git a/lib/libc/gen/__getosreldate.c b/lib/libc/gen/__getosreldate.c
new file mode 100644
index 0000000..69aac07
--- /dev/null
+++ b/lib/libc/gen/__getosreldate.c
@@ -0,0 +1,61 @@
+/*-
+ * Copyright (c) 2007 Peter Wemm
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/sysctl.h>
+
+/*
+ * This is private to libc.  It is intended for wrapping syscall stubs in order
+ * to avoid having to put SIGSYS signal handlers in place to test for presence
+ * of new syscalls.  This caches the result in order to be as quick as possible.
+ *
+ * Use getosreldate(3) for public use as it respects the $OSVERSION environment
+ * variable.
+ */
+
+int
+__getosreldate(void)
+{
+	static int osreldate;
+	size_t len;
+	int oid[2];
+	int error, osrel;
+
+	if (osreldate != 0)
+		return (osreldate);
+	
+	oid[0] = CTL_KERN;
+	oid[1] = KERN_OSRELDATE;
+	osrel = 0;
+	len = sizeof(osrel);
+	error = sysctl(oid, 2, &osrel, &len, NULL, 0);
+	if (error == 0 && osrel > 0 && len == sizeof(osrel))
+		osreldate = osrel;
+	return (osreldate);
+}