[compiler-rt] intercept macos fpurge

Author: devnexen

compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc

@@ -10263,6 +10263,21 @@ INTERCEPTOR(SSIZE_T, freadlink, int fd, char *buf, SIZE_T bufsiz) {
 #  define INIT_FREADLINK
 #endif
 
+#if SANITIZER_INTERCEPT_FPURGE
+INTERCEPTOR(int, fpurge, __sanitizer_FILE *fp) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, fflush, fp);
+  if (fp)
+    unpoison_file(fp);
+  int res = REAL(fpurge)(fp);
+  if (fp) {
+    const FileMetadata *m = GetInterceptorMetadata(fp);
+    if (m) COMMON_INTERCEPTOR_INITIALIZE_RANGE(*m->addr, *m->size);
+  }
+  return res;
+}
+#endif
+
 #include "sanitizer_common_interceptors_netbsd_compat.inc"
 
 namespace __sanitizer {

compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h

@@ -640,6 +640,7 @@ SANITIZER_WEAK_IMPORT void *aligned_alloc(__sanitizer::usize __alignment,
 #  define SI_MAC_OS_DEPLOYMENT_MIN_13_00 0
 #endif
 #define SANITIZER_INTERCEPT_FREADLINK (SI_MAC && SI_MAC_OS_DEPLOYMENT_MIN_13_00)
+#define SANITIZER_INTERCEPT_FPURGE SI_MAC
 // This macro gives a way for downstream users to override the above
 // interceptor macros irrespective of the platform they are on. They have
 // to do two things: