[compiler-rt] r188291 - tsan: intercept getaddrinfo

[Dmitry Vyukov]

Author: dvyukov
Date: Tue Aug 13 11:51:27 2013
New Revision: 188291

URL: http://llvm.org/viewvc/llvm-project?rev=188291&view=rev
Log:
tsan: intercept getaddrinfo
This is necessary to prevent false positives, see:
https://code.google.com/p/thread-sanitizer/issues/detail?id=25


Modified:
    compiler-rt/trunk/lib/tsan/rtl/tsan_interceptors.cc

Modified: compiler-rt/trunk/lib/tsan/rtl/tsan_interceptors.cc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/tsan/rtl/tsan_interceptors.cc?rev=188291&r1=188290&r2=188291&view=diff
==============================================================================
--- compiler-rt/trunk/lib/tsan/rtl/tsan_interceptors.cc (original)
+++ compiler-rt/trunk/lib/tsan/rtl/tsan_interceptors.cc Tue Aug 13 11:51:27 2013
@@ -1735,6 +1735,20 @@ TSAN_INTERCEPTOR(int, gettimeofday, void
   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);