adding fpurge

Author: devnexen

compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp

@@ -297,6 +297,13 @@ INTERCEPTOR(int, fflush, FILE *stream) {
   return REAL(fflush)(stream);
 }
 
+#if SANITIZER_APPLE
+INTERCEPTOR(int, fpurge, FILE *stream) {
+  __rtsan_notify_intercepted_call("fpurge");
+  return REAL(fpurge)(stream);
+}
+#endif
+
 INTERCEPTOR(FILE *, fdopen, int fd, const char *mode) {
   __rtsan_notify_intercepted_call("fdopen");
   return REAL(fdopen)(fd, mode);

compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp

@@ -607,16 +607,31 @@ TEST_F(RtsanOpenedFileTest, FputsDiesWhenRealtime) {
 TEST_F(RtsanFileTest, FflushDiesWhenRealtime) {
   FILE *f = fopen(GetTemporaryFilePath(), "w");
   EXPECT_THAT(f, Ne(nullptr));
-  int r = fwrite("abc", 1, 3, f);
-  EXPECT_THAT(r, Eq(3));
+  int written = fwrite("abc", 1, 3, f);
+  EXPECT_THAT(written, Eq(3));
   auto Func = [&f]() {
-    int r = fflush(f);
-    EXPECT_THAT(r, Eq(0));
+    int res = fflush(f);
+    EXPECT_THAT(res, Eq(0));
   };
   ExpectRealtimeDeath(Func, "fflush");
   ExpectNonRealtimeSurvival(Func);
 }
 
+#if SANITIZER_APPLE
+TEST_F(RtsanFileTest, FpurgeDiesWhenRealtime) {
+  FILE *f = fopen(GetTemporaryFilePath(), "w");
+  EXPECT_THAT(f, Ne(nullptr));
+  int written = fwrite("abc", 1, 3, f);
+  EXPECT_THAT(written, Eq(3));
+  auto Func = [&f]() {
+    int res = fpurge(f);
+    EXPECT_THAT(res, Eq(0));
+  };
+  ExpectRealtimeDeath(Func, "fpurge");
+  ExpectNonRealtimeSurvival(Func);
+}
+#endif
+
 TEST_F(RtsanOpenedFileTest, ReadDiesWhenRealtime) {
   auto Func = [this]() {
     char c{};