From 11c374a4b36d49a940ea0a58734dcddbef0395f8 Mon Sep 17 00:00:00 2001
From: ptitSeb <sebastien.chev@gmail.com>
Date: Sat, 16 Nov 2019 13:55:46 +0100
Subject: [PATCH] Added a test for swapcontext and friends

---
 CMakeLists.txt  |   7 ++++++-
 tests/ref13.txt |   8 +++++++
 tests/test13    | Bin 0 -> 7512 bytes
 tests/test13.c  |  54 ++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 68 insertions(+), 1 deletion(-)
 create mode 100644 tests/ref13.txt
 create mode 100755 tests/test13
 create mode 100644 tests/test13.c

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 57b7933a..fffcfc49 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -306,7 +306,12 @@ add_test(test12 ${CMAKE_COMMAND} -D TEST_PROGRAM=${CMAKE_BINARY_DIR}/${BOX86}
     -D TEST_REFERENCE=${CMAKE_SOURCE_DIR}/tests/ref12.txt
     -P ${CMAKE_SOURCE_DIR}/runTest.cmake )
 
-file(GLOB extension_tests "${CMAKE_SOURCE_DIR}/tests/extensions/*.c")
+add_test(test13 ${CMAKE_COMMAND} -D TEST_PROGRAM=${CMAKE_BINARY_DIR}/${BOX86} 
+    -D TEST_ARGS=${CMAKE_SOURCE_DIR}/tests/test13 -D TEST_OUTPUT=tmpfile.txt 
+    -D TEST_REFERENCE=${CMAKE_SOURCE_DIR}/tests/ref13.txt
+    -P ${CMAKE_SOURCE_DIR}/runTest.cmake )
+
+    file(GLOB extension_tests "${CMAKE_SOURCE_DIR}/tests/extensions/*.c")
 foreach(file ${extension_tests})
     get_filename_component(testname "${file}" NAME_WE)
     add_test(NAME "${testname}" COMMAND ${CMAKE_COMMAND} -D TEST_PROGRAM=${CMAKE_BINARY_DIR}/${BOX86}
diff --git a/tests/ref13.txt b/tests/ref13.txt
new file mode 100644
index 00000000..33118c0d
--- /dev/null
+++ b/tests/ref13.txt
@@ -0,0 +1,8 @@
+main: swapcontext(&uctx_main, &uctx_func2)
+func2: started (1, 2)
+func2: swapcontext(&uctx_func2, &uctx_func1)
+func1: started
+func1: swapcontext(&uctx_func1, &uctx_func2)
+func2: returning
+func1: returning
+main: exiting
diff --git a/tests/test13 b/tests/test13
new file mode 100755
index 0000000000000000000000000000000000000000..823cb65b8ec08095b478b5fa037c89bf7a55b6e8
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diff --git a/tests/test13.c b/tests/test13.c
new file mode 100644
index 00000000..38dd891f
--- /dev/null
+++ b/tests/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