2 files changed, 114 insertions, 1 deletions
diff --git a/stdlib/Makefile b/stdlib/Makefile
index 193c42b284..301e2d22f3 100644
--- a/stdlib/Makefile
+++ b/stdlib/Makefile
@@ -59,7 +59,7 @@ test-srcs	:= tst-fmtmsg
 tests		:= tst-strtol tst-strtod testmb testrand testsort testdiv \
 		   test-canon test-canon2 tst-strtoll tst-environ	  \
 		   tst-xpg-basename tst-random tst-bsearch tst-limits	  \
-		   tst-rand48 bug-strtod
+		   tst-rand48 bug-strtod tst-setcontext
 
 
 # Several mpn functions from GNU MP are used by the strtod function.
diff --git a/stdlib/tst-setcontext.c b/stdlib/tst-setcontext.c
new file mode 100644
index 0000000000..6ee1b514a6
--- /dev/null
+++ b/stdlib/tst-setcontext.c
@@ -0,0 +1,113 @@
+/* Copyright (C) 2001 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <ucontext.h>
+
+static ucontext_t ctx[3];
+
+static int was_in_f1;
+static int was_in_f2;
+
+static void
+f1 (long a0, long a1, long a2, long a3)
+{
+  printf ("start f1(a0=%lx,a1=%lx,a2=%lx,a3=%lx)\n", a0, a1, a2, a3);
+
+  if (a0 != 1 || a1 != 2 || a2 != 3 || a3 != -4)
+    {
+      puts ("arg mismatch");
+      exit (-1);
+    }
+
+  if (swapcontext (&ctx[1], &ctx[2]) != 0)
+    {
+      printf ("%s: swapcontext: %m\n", __FUNCTION__);
+      exit (1);
+    }
+  puts ("finish f1");
+  was_in_f1 = 1;
+}
+
+static void
+f2 (void)
+{
+  puts ("start f2");
+  if (swapcontext (&ctx[2], &ctx[1]) != 0)
+    {
+      printf ("%s: swapcontext: %m\n", __FUNCTION__);
+      exit (1);
+    }
+  puts ("finish f2");
+  was_in_f2 = 1;
+}
+
+int
+main (void)
+{
+  char st1[8192];
+  char st2[8192];
+
+  puts ("making contexts");
+  if (getcontext (&ctx[1]) != 0)
+    {
+      if (errno == ENOSYS)
+	exit (0);
+
+      printf ("%s: getcontext: %m\n", __FUNCTION__);
+      exit (1);
+    }
+  ctx[1].uc_stack.ss_sp = st1;
+  ctx[1].uc_stack.ss_size = sizeof st1;
+  ctx[1].uc_link = &ctx[0];
+  makecontext (&ctx[1], (void (*) (void)) f1, 4, 1, 2, 3, -4);
+
+  if (getcontext (&ctx[2]) != 0)
+    {
+      printf ("%s: second getcontext: %m\n", __FUNCTION__);
+      exit (1);
+    }
+  ctx[2].uc_stack.ss_sp = st2;
+  ctx[2].uc_stack.ss_size = sizeof st2;
+  ctx[2].uc_link = &ctx[1];
+  makecontext (&ctx[2], f2, 0);
+
+  puts ("swapping contexts");
+  if (swapcontext (&ctx[0], &ctx[2]) != 0)
+    {
+      printf ("%s: swapcontext: %m\n", __FUNCTION__);
+      exit (1);
+    }
+  puts ("back at main program");
+
+  if (was_in_f1 == 0)
+    {
+      puts ("didn't reach f1");
+      exit (1);
+    }
+  if (was_in_f2 == 0)
+    {
+      puts ("didn't reach f2");
+      exit (1);
+    }
+
+  puts ("test succeeded");
+  return 0;
+}