Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/msan/getc_unlocked.c

@@ -0,0 +1,32 @@
+// RUN: %clangxx_msan -DGETC -O0 -g -xc++ %s -o %t && %run %t
+// RUN: %clangxx_msan -DGETC -O3 -g -xc++ %s -o %t && %run %t
+// RUN: %clang_msan -DGETC -O0 -g %s -o %t && %run %t
+// RUN: %clang_msan -DGETC -O3 -g %s -o %t && %run %t
+
+// RUN: %clangxx_msan -DGETCHAR -O0 -g -xc++ %s -o %t && %run %t
+// RUN: %clangxx_msan -DGETCHAR -O3 -g -xc++ %s -o %t && %run %t
+// RUN: %clang_msan -DGETCHAR -O0 -g %s -o %t && %run %t
+// RUN: %clang_msan -DGETCHAR -O3 -g %s -o %t && %run %t
+
+#include <assert.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int main() {
+  FILE *stream = fopen("/dev/zero", "r");
+  flockfile (stream);
+  int c;
+#if defined(GETCHAR)
+  int res = dup2(fileno(stream), 0);
+  assert(res == 0);
+  c = getchar_unlocked();
+#elif defined(GETC)
+  c = getc_unlocked (stream);
+#endif
+  funlockfile (stream);
+  if (c == EOF)
+    return 1;
+  printf("%c\n", (char)c);
+  fclose(stream);
+  return 0;
+}