1 // Copyright 2018 gRPC authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #include "src/core/lib/iomgr/internal_errqueue.h" 16 17 #include <grpc/support/port_platform.h> 18 19 #include "absl/log/log.h" 20 #include "src/core/lib/iomgr/port.h" 21 22 #ifdef GRPC_POSIX_SOCKET_TCP 23 24 #include <errno.h> 25 #include <stdlib.h> 26 #include <string.h> 27 #include <sys/utsname.h> 28 29 #include "src/core/util/strerror.h" 30 31 namespace grpc_core { 32 KernelSupportsErrqueue()33bool KernelSupportsErrqueue() { 34 static const bool errqueue_supported = []() { 35 #ifdef GRPC_LINUX_ERRQUEUE 36 // Both-compile time and run-time linux kernel versions should be at 37 // least 4.0.0 38 struct utsname buffer; 39 if (uname(&buffer) != 0) { 40 LOG(ERROR) << "uname: " << StrError(errno); 41 return false; 42 } 43 char* release = buffer.release; 44 if (release == nullptr) { 45 return false; 46 } 47 48 if (strtol(release, nullptr, 10) >= 4) { 49 return true; 50 } else { 51 VLOG(2) << "ERRQUEUE support not enabled"; 52 } 53 #endif // GRPC_LINUX_ERRQUEUE 54 return false; 55 }(); 56 return errqueue_supported; 57 } 58 } // namespace grpc_core 59 60 #endif // GRPC_POSIX_SOCKET_TCP 61