1 files changed, 55 insertions, 0 deletions
diff --git a/src/tracing/ipc/memfd.h b/src/tracing/ipc/memfd.h
new file mode 100644
index 000000000..8cf4b2a2c
--- /dev/null
+++ b/src/tracing/ipc/memfd.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SRC_TRACING_IPC_MEMFD_H_
+#define SRC_TRACING_IPC_MEMFD_H_
+
+#include "perfetto/base/build_config.h"
+
+#include "perfetto/ext/base/scoped_file.h"
+
+// Some android build bots use a sysroot that doesn't support memfd when
+// compiling for the host, so we define the flags we need ourselves.
+
+// from memfd.h
+#ifndef MFD_CLOEXEC
+#define MFD_CLOEXEC 0x0001U
+#define MFD_ALLOW_SEALING 0x0002U
+#endif
+
+// from fcntl.h
+#ifndef F_ADD_SEALS
+#define F_ADD_SEALS 1033
+#define F_GET_SEALS 1034
+#define F_SEAL_SEAL 0x0001
+#define F_SEAL_SHRINK 0x0002
+#define F_SEAL_GROW 0x0004
+#define F_SEAL_WRITE 0x0008
+#endif
+
+namespace perfetto {
+
+// Whether the operating system supports memfd.
+bool HasMemfdSupport();
+
+// Call memfd(2) if available on platform and return the fd as result. This call
+// also makes a kernel version check for safety on older kernels (b/116769556).
+// Returns an invalid ScopedFile on failure.
+base::ScopedFile CreateMemfd(const char* name, unsigned int flags);
+
+}  // namespace perfetto
+
+#endif  // SRC_TRACING_IPC_MEMFD_H_