1 files changed, 53 insertions, 0 deletions
diff --git a/lib/libc/sys/swapcontext.c b/lib/libc/sys/swapcontext.c
new file mode 100644
index 0000000..0a8125e
--- /dev/null
+++ b/lib/libc/sys/swapcontext.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2001 Daniel M. Eischen <deischen@freebsd.org>
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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. Neither the name of the author nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * 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/signal.h>
+#include <sys/ucontext.h>
+#include <errno.h>
+#include <stddef.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_swapcontext, __swapcontext);
+__sym_compat(swapcontext, __impl_swapcontext, FBSD_1.0);
+__weak_reference(swapcontext, __impl_swapcontext);
+__sym_default(swapcontext, swapcontext, FBSD_1.2);
+
+#pragma weak swapcontext
+int
+swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
+{
+
+	return (((int (*)(ucontext_t *, const ucontext_t *))
+	    __libc_interposing[INTERPOS_swapcontext])(oucp, ucp));
+}