1 /* 2 * Copyright (C) 2020 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SRC_TRACING_IPC_MEMFD_H_ 18 #define SRC_TRACING_IPC_MEMFD_H_ 19 20 #include "perfetto/base/build_config.h" 21 22 #include "perfetto/ext/base/scoped_file.h" 23 24 // Some android build bots use a sysroot that doesn't support memfd when 25 // compiling for the host, so we define the flags we need ourselves. 26 27 // from memfd.h 28 #ifndef MFD_CLOEXEC 29 #define MFD_CLOEXEC 0x0001U 30 #define MFD_ALLOW_SEALING 0x0002U 31 #endif 32 33 // from fcntl.h 34 #ifndef F_ADD_SEALS 35 #define F_ADD_SEALS 1033 36 #define F_GET_SEALS 1034 37 #define F_SEAL_SEAL 0x0001 38 #define F_SEAL_SHRINK 0x0002 39 #define F_SEAL_GROW 0x0004 40 #define F_SEAL_WRITE 0x0008 41 #endif 42 43 namespace perfetto { 44 45 // Whether the operating system supports memfd. 46 bool HasMemfdSupport(); 47 48 // Call memfd(2) if available on platform and return the fd as result. This call 49 // also makes a kernel version check for safety on older kernels (b/116769556). 50 // Returns an invalid ScopedFile on failure. 51 base::ScopedFile CreateMemfd(const char* name, unsigned int flags); 52 53 } // namespace perfetto 54 55 #endif // SRC_TRACING_IPC_MEMFD_H_ 56