From ffffbefa437a00ca44f0a925c0ff73ae38f1a936 Mon Sep 17 00:00:00 2001
From: Evgeniy Stepanov <eugeni.stepanov@gmail.com>
Date: Wed, 23 Jan 2013 10:43:38 +0000
Subject: [PATCH] [msan] gethostbyname interceptor.

llvm-svn: 173249
---
 compiler-rt/lib/msan/msan_interceptors.cc | 13 +++++++++++++
 compiler-rt/lib/msan/tests/msan_test.cc   |  7 +++++++
 2 files changed, 20 insertions(+)

diff --git a/compiler-rt/lib/msan/msan_interceptors.cc b/compiler-rt/lib/msan/msan_interceptors.cc
index 102e61a6d4f8..f64f443187db 100644
--- a/compiler-rt/lib/msan/msan_interceptors.cc
+++ b/compiler-rt/lib/msan/msan_interceptors.cc
@@ -612,6 +612,18 @@ INTERCEPTOR(int, uname, void *utsname) {
   return res;
 }
 
+INTERCEPTOR(int, gethostname, char *name, SIZE_T len) {
+  ENSURE_MSAN_INITED();
+  int res = REAL(gethostname)(name, len);
+  if (!res) {
+    SIZE_T real_len = REAL(strnlen)(name, len);
+    if (real_len < len)
+      ++real_len;
+    __msan_unpoison(name, real_len);
+  }
+  return res;
+}
+
 INTERCEPTOR(int, epoll_wait, int epfd, void *events, int maxevents,
     int timeout) {
   ENSURE_MSAN_INITED();
@@ -936,6 +948,7 @@ void InitializeInterceptors() {
   INTERCEPT_FUNCTION(statfs64);
   INTERCEPT_FUNCTION(fstatfs64);
   INTERCEPT_FUNCTION(uname);
+  INTERCEPT_FUNCTION(gethostname);
   INTERCEPT_FUNCTION(epoll_wait);
   INTERCEPT_FUNCTION(epoll_pwait);
   INTERCEPT_FUNCTION(recv);
diff --git a/compiler-rt/lib/msan/tests/msan_test.cc b/compiler-rt/lib/msan/tests/msan_test.cc
index 4401848f5312..f65d6f9bff77 100644
--- a/compiler-rt/lib/msan/tests/msan_test.cc
+++ b/compiler-rt/lib/msan/tests/msan_test.cc
@@ -1306,6 +1306,13 @@ TEST(MemorySanitizer, uname) {
   EXPECT_NOT_POISONED(strlen(u.machine));
 }
 
+TEST(MemorySanitizer, gethostname) {
+  char buf[100];
+  int res = gethostname(buf, 100);
+  assert(!res);
+  EXPECT_NOT_POISONED(strlen(buf));
+}
+
 template<class T>
 static bool applySlt(T value, T shadow) {
   __msan_partial_poison(&value, &shadow, sizeof(T));
-- 
2.34.1