From cf878fd3e01cd141ad1e095764d64c410c0ce763 Mon Sep 17 00:00:00 2001
From: Dmitry Vyukov <dvyukov@google.com>
Date: Tue, 13 Aug 2013 16:51:27 +0000
Subject: [PATCH] tsan: intercept getaddrinfo This is necessary to prevent
 false positives, see:
 https://code.google.com/p/thread-sanitizer/issues/detail?id=25

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@188291 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/tsan/rtl/tsan_interceptors.cc | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/lib/tsan/rtl/tsan_interceptors.cc b/lib/tsan/rtl/tsan_interceptors.cc
index ad69de0e7..9d6d3e030 100644
--- a/lib/tsan/rtl/tsan_interceptors.cc
+++ b/lib/tsan/rtl/tsan_interceptors.cc
@@ -1735,6 +1735,20 @@ TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
   return REAL(gettimeofday)(tv, tz);
 }
 
+TSAN_INTERCEPTOR(int, getaddrinfo, void *node, void *service,
+    void *hints, void *rv) {
+  SCOPED_TSAN_INTERCEPTOR(getaddrinfo, node, service, hints, rv);
+  // We miss atomic synchronization in getaddrinfo,
+  // and can report false race between malloc and free
+  // inside of getaddrinfo. So ignore memory accesses.
+  IgnoreCtl(thr, true, true);
+  IgnoreCtl(thr, false, true);
+  int res = REAL(getaddrinfo)(node, service, hints, rv);
+  IgnoreCtl(thr, true, false);
+  IgnoreCtl(thr, false, false);
+  return res;
+}
+
 // Linux kernel has a bug that leads to kernel deadlock if a process
 // maps TBs of memory and then calls mlock().
 static void MlockIsUnsupported() {
@@ -2056,6 +2070,7 @@ void InitializeInterceptors() {
   TSAN_INTERCEPT(usleep);
   TSAN_INTERCEPT(nanosleep);
   TSAN_INTERCEPT(gettimeofday);
+  TSAN_INTERCEPT(getaddrinfo);
 
   TSAN_INTERCEPT(mlock);
   TSAN_INTERCEPT(munlock);
-- 
2.11.4.GIT