1 files changed, 50 insertions, 0 deletions
diff --git a/test/test-pc-patch.c b/test/test-pc-patch.c
new file mode 100644
index 0000000..5ae3570
--- /dev/null
+++ b/test/test-pc-patch.c
@@ -0,0 +1,50 @@
+#include "substitute-internal.h"
+#include "execmem.h"
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <assert.h>
+/* printf without taking any locks - because they might be taken at stop time */
+#define ulprintf(...) do { \
+    char buf[256]; \
+    int len = sprintf(buf, __VA_ARGS__); \
+    write(1, buf, len); \
+} while(0)
+
+static void *some_thread(void *ip) {
+    long i = (long) ip;
+    while (1) {
+        ulprintf("Hello from %ld\n", i);
+        sleep(1);
+    }
+}
+static void replacement() {
+    ulprintf("Bye\n");
+    pthread_exit(NULL);
+}
+static uintptr_t patch_callback(void *ctx, UNUSED uintptr_t pc) {
+    assert(!ctx);
+    return (uintptr_t) replacement;
+}
+
+int main() {
+    pthread_t pts[10];
+    for (long i = 0; i < 10; i++)
+        pthread_create(&pts[i], NULL, some_thread, (void *) i);
+    sleep(1);
+    char *foo = malloc(0x10000);
+    static char bar[16];
+    struct execmem_foreign_write writes[] = {
+        {foo, bar, 5},
+        {foo + 7, bar + 7, 3},
+    };
+    int ret = execmem_foreign_write_with_pc_patch(writes,
+                                                  sizeof(writes)/sizeof(*writes),
+                                                  patch_callback,
+                                                  NULL);
+    ulprintf("==> %d\n", ret);
+    void *out;
+    for (long i = 0; i < 10; i++)
+        assert(!pthread_join(pts[i], &out));
+}