[Sanitizers] TSan allocator set errno on failure.

Summary:
Set proper errno code on allocation failures and change realloc, pvalloc,
aligned_alloc, memalign and posix_memalign implementation to satisfy
their man-specified requirements.

Modify allocator API implementation to bring it closer to other
sanitizers allocators.

Reviewers: dvyukov

Subscribers: llvm-commits, kubamracek

Differential Revision: https://reviews.llvm.org/D35690

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308929 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 11 insertions, 1 deletions

diff --git a/test/tsan/allocator_returns_null.cc b/test/tsan/allocator_returns_null.cc
index 852dda035..5e2e2e9a5 100644
--- a/test/tsan/allocator_returns_null.cc
+++ b/test/tsan/allocator_returns_null.cc
@@ -37,9 +37,10 @@
 // RUN:   | FileCheck %s --check-prefix=CHECK-nnNULL
 
 #include <assert.h>
-#include <string.h>
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <limits>
 #include <new>
 
@@ -51,6 +52,7 @@ int main(int argc, char **argv) {
   const char *action = argv[1];
   fprintf(stderr, "%s:\n", action);
 
+  // The limit enforced in tsan_mman.cc, user_alloc_internal function.
   static const size_t kMaxAllowedMallocSizePlusOne = (1ULL << 40) + 1;
 
   void *x = 0;
@@ -78,10 +80,13 @@ int main(int argc, char **argv) {
     assert(0);
   }
 
+  fprintf(stderr, "errno: %d\n", errno);
+
   // The NULL pointer is printed differently on different systems, while (long)0
   // is always the same.
   fprintf(stderr, "x: %lx\n", (long)x);
   free(x);
+
   return x != 0;
 }
 
@@ -101,14 +106,19 @@ int main(int argc, char **argv) {
 // CHECK-nnCRASH: ThreadSanitizer's allocator is terminating the process
 
 // CHECK-mNULL: malloc:
+// CHECK-mNULL: errno: 12
 // CHECK-mNULL: x: 0
 // CHECK-cNULL: calloc:
+// CHECK-cNULL: errno: 12
 // CHECK-cNULL: x: 0
 // CHECK-coNULL: calloc-overflow:
+// CHECK-coNULL: errno: 12
 // CHECK-coNULL: x: 0
 // CHECK-rNULL: realloc:
+// CHECK-rNULL: errno: 12
 // CHECK-rNULL: x: 0
 // CHECK-mrNULL: realloc-after-malloc:
+// CHECK-mrNULL: errno: 12
 // CHECK-mrNULL: x: 0
 // CHECK-nnNULL: new-nothrow:
 // CHECK-nnNULL: x: 0