1 files changed, 54 insertions, 0 deletions
diff --git a/tests32/test13.c b/tests32/test13.c
new file mode 100644
index 00000000..38dd891f
--- /dev/null
+++ b/tests32/test13.c
@@ -0,0 +1,54 @@
+#include <ucontext.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static ucontext_t uctx_main, uctx_func1, uctx_func2;
+
+#define handle_error(msg) \
+    do { perror(msg); exit(EXIT_FAILURE); } while (0)
+
+static void func1(void)
+{
+    printf("func1: started\n");
+    printf("func1: swapcontext(&uctx_func1, &uctx_func2)\n");
+    if (swapcontext(&uctx_func1, &uctx_func2) == -1)
+        handle_error("swapcontext");
+    printf("func1: returning\n");
+}
+
+static void func2(int a, int b)
+{
+    printf("func2: started (%d, %d)\n", a, b);
+    printf("func2: swapcontext(&uctx_func2, &uctx_func1)\n");
+    if (swapcontext(&uctx_func2, &uctx_func1) == -1)
+        handle_error("swapcontext");
+    printf("func2: returning\n");
+}
+
+int main(int argc, char *argv[])
+{
+    char func1_stack[16384];
+    char func2_stack[16384];
+
+    if (getcontext(&uctx_func1) == -1)
+        handle_error("getcontext");
+    uctx_func1.uc_stack.ss_sp = func1_stack;
+    uctx_func1.uc_stack.ss_size = sizeof(func1_stack);
+    uctx_func1.uc_link = &uctx_main;
+    makecontext(&uctx_func1, func1, 0);
+
+    if (getcontext(&uctx_func2) == -1)
+        handle_error("getcontext");
+    uctx_func2.uc_stack.ss_sp = func2_stack;
+    uctx_func2.uc_stack.ss_size = sizeof(func2_stack);
+    /* Successor context is f1(), unless argc > 1 */
+    uctx_func2.uc_link = (argc > 1) ? NULL : &uctx_func1;
+    makecontext(&uctx_func2, func2, 2, 1, 2);
+
+    printf("main: swapcontext(&uctx_main, &uctx_func2)\n");
+    if (swapcontext(&uctx_main, &uctx_func2) == -1)
+        handle_error("swapcontext");
+
+    printf("main: exiting\n");
+    exit(EXIT_SUCCESS);
+}
\ No newline at end of file