Fix build on OpenBSD

Summary:
A few simple changes to allow RocksDB to be built on OpenBSD. Let me know if any further changes are needed.
Closes https://github.com/facebook/rocksdb/pull/3061

Differential Revision: D6138800

Pulled By: ajkr

fbshipit-source-id: a13a17b5dc051e6518bd56a8c5efd1d24dd81b0c

db/db_test_util.cc

@@ -465,7 +465,7 @@ Options DBTestBase::GetOptions(
       options.use_direct_io_for_flush_and_compaction = true;
       options.compaction_readahead_size = 2 * 1024 * 1024;
 #if !defined(OS_MACOSX) && !defined(OS_WIN) && !defined(OS_SOLARIS) && \
-    !defined(OS_AIX)
+    !defined(OS_AIX) && !defined(OS_OPENBSD)
       rocksdb::SyncPoint::GetInstance()->SetCallBack(
           "NewWritableFile:O_DIRECT", [&](void* arg) {
             int* val = static_cast<int*>(arg);

env/env_test.cc

@@ -1137,7 +1137,7 @@ TEST_P(EnvPosixTestWithParam, Preallocation) {
     unique_ptr<WritableFile> srcfile;
     EnvOptions soptions;
     soptions.use_direct_reads = soptions.use_direct_writes = direct_io_;
-#if !defined(OS_MACOSX) && !defined(OS_WIN) && !defined(OS_SOLARIS) && !defined(OS_AIX)
+#if !defined(OS_MACOSX) && !defined(OS_WIN) && !defined(OS_SOLARIS) && !defined(OS_AIX) && !defined(OS_OPENBSD)
     if (soptions.use_direct_writes) {
       rocksdb::SyncPoint::GetInstance()->SetCallBack(
           "NewWritableFile:O_DIRECT", [&](void* arg) {
@@ -1199,7 +1199,7 @@ TEST_P(EnvPosixTestWithParam, ConsistentChildrenAttributes) {
       oss << test::TmpDir(env_) << "/testfile_" << i;
       const std::string path = oss.str();
       unique_ptr<WritableFile> file;
-#if !defined(OS_MACOSX) && !defined(OS_WIN) && !defined(OS_SOLARIS) && !defined(OS_AIX)
+#if !defined(OS_MACOSX) && !defined(OS_WIN) && !defined(OS_SOLARIS) && !defined(OS_AIX) && !defined(OS_OPENBSD)
       if (soptions.use_direct_writes) {
         rocksdb::SyncPoint::GetInstance()->SetCallBack(
             "NewWritableFile:O_DIRECT", [&](void* arg) {

utilities/transactions/write_prepared_transaction_test.cc

@@ -618,10 +618,10 @@ TEST_P(WritePreparedTransactionTest, SeqAdvanceConcurrentTest) {
     base[bi] = base[bi - 1] * type_cnt;
   }
   const size_t max_n = static_cast<size_t>(std::pow(type_cnt, txn_cnt));
-  printf("Number of cases being tested is %" PRIu64 "\n", max_n);
+  printf("Number of cases being tested is %" ROCKSDB_PRIszt "\n", max_n);
   for (size_t n = 0; n < max_n; n++, ReOpen()) {
     if (n % 1000 == 0) {
-      printf("Tested %" PRIu64 " cases so far\n", n);
+      printf("Tested %" ROCKSDB_PRIszt " cases so far\n", n);
     }
     DBImpl* db_impl = reinterpret_cast<DBImpl*>(db->GetRootDB());
     auto seq = db_impl->TEST_GetLatestVisibleSequenceNumber();