1 /* 2 * 3 * Copyright 2018 gRPC authors. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 19 #include <grpc/support/port_platform.h> 20 21 #include "src/core/lib/iomgr/port.h" 22 23 #include <grpc/impl/codegen/log.h> 24 #include "src/core/lib/iomgr/internal_errqueue.h" 25 26 #ifdef GRPC_POSIX_SOCKET_TCP 27 28 #include <errno.h> 29 #include <stdlib.h> 30 #include <string.h> 31 #include <sys/utsname.h> 32 33 namespace grpc_core { 34 static bool errqueue_supported = false; 35 kernel_supports_errqueue()36bool kernel_supports_errqueue() { return errqueue_supported; } 37 grpc_errqueue_init()38void grpc_errqueue_init() { 39 /* Both-compile time and run-time linux kernel versions should be at least 4.0.0 40 */ 41 #ifdef GRPC_LINUX_ERRQUEUE 42 struct utsname buffer; 43 if (uname(&buffer) != 0) { 44 gpr_log(GPR_ERROR, "uname: %s", strerror(errno)); 45 return; 46 } 47 char* release = buffer.release; 48 if (release == nullptr) { 49 return; 50 } 51 52 if (strtol(release, nullptr, 10) >= 4) { 53 errqueue_supported = true; 54 } else { 55 gpr_log(GPR_DEBUG, "ERRQUEUE support not enabled"); 56 } 57 #endif /* GRPC_LINUX_ERRQUEUE */ 58 } 59 } /* namespace grpc_core */ 60 61 #else 62 63 namespace grpc_core { grpc_errqueue_init()64void grpc_errqueue_init() {} 65 } /* namespace grpc_core */ 66 67 #endif /* GRPC_POSIX_SOCKET_TCP */ 68