--- /dev/null
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * 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 _POSIX_SOURCE
+#define _POSIX_SOURCE
+#endif
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <grpc/support/port_platform.h>
+
+#ifdef GPR_LINUX_LOG
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+#include <grpc/support/time.h>
+#include <inttypes.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/syscall.h>
+#include <time.h>
+#include <unistd.h>
+
+static long sys_gettid(void) { return syscall(__NR_gettid); }
+
+void gpr_log(const char* file, int line, gpr_log_severity severity,
+ const char* format, ...) {
+ /* Avoid message construction if gpr_log_message won't log */
+ if (gpr_should_log(severity) == 0) {
+ return;
+ }
+ char* message = nullptr;
+ va_list args;
+ va_start(args, format);
+ if (vasprintf(&message, format, args) == -1) {
+ va_end(args);
+ return;
+ }
+ va_end(args);
+ gpr_log_message(file, line, severity, message);
+ /* message has been allocated by vasprintf above, and needs free */
+ free(message);
+}
+
+void gpr_default_log(gpr_log_func_args* args) {
+ const char* final_slash;
+ char* prefix;
+ const char* display_file;
+ char time_buffer[64];
+ time_t timer;
+ gpr_timespec now = gpr_now(GPR_CLOCK_REALTIME);
+ struct tm tm;
+ static __thread long tid = 0;
+ if (tid == 0) tid = sys_gettid();
+
+ timer = static_cast<time_t>(now.tv_sec);
+ final_slash = strrchr(args->file, '/');
+ if (final_slash == nullptr)
+ display_file = args->file;
+ else
+ display_file = final_slash + 1;
+
+ if (!localtime_r(&timer, &tm)) {
+ strcpy(time_buffer, "error:localtime");
+ } else if (0 ==
+ strftime(time_buffer, sizeof(time_buffer), "%m%d %H:%M:%S", &tm)) {
+ strcpy(time_buffer, "error:strftime");
+ }
+
+ gpr_asprintf(&prefix, "%s%s.%09" PRId32 " %7ld %s:%d]",
+ gpr_log_severity_string(args->severity), time_buffer,
+ now.tv_nsec, tid, display_file, args->line);
+
+ fprintf(stderr, "%-60s %s\n", prefix, args->message);
+ gpr_free(prefix);
+}
+
+#endif /* GPR_LINUX_LOG */