| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| #include "core/conf.h" |
| #include "core/htrace.h" |
| #include "util/log.h" |
| |
| #include <errno.h> |
| #include <pthread.h> |
| #include <stdarg.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| struct htrace_log { |
| /** |
| * The lock which protects this log from concurrent writes. |
| */ |
| pthread_mutex_t lock; |
| |
| /** |
| * The log file. |
| */ |
| FILE *fp; |
| |
| /** |
| * Nonzero if we should close this file when closing the log. |
| */ |
| int should_close; |
| }; |
| |
| struct htrace_log *htrace_log_alloc(const struct htrace_conf *conf) |
| { |
| struct htrace_log *lg; |
| const char *path; |
| |
| lg = calloc(1, sizeof(*lg)); |
| if (!lg) { |
| fprintf(stderr, "htrace_log_alloc: out of memory.\n"); |
| return NULL; |
| } |
| path = htrace_conf_get(conf, HTRACE_LOG_PATH_KEY); |
| if (!path) { |
| lg->fp = stderr; |
| return lg; |
| } |
| lg->fp = fopen(path, "a"); |
| if (!lg->fp) { |
| int err = errno; |
| fprintf(stderr, "htrace_log_alloc: failed to open %s for " |
| "append: %d (%s).\n", |
| path, err, terror(err)); |
| lg->fp = stderr; |
| return lg; |
| } |
| // If we're logging to a file, we need to close the file when we close the |
| // log. |
| lg->should_close = 1; |
| return lg; |
| } |
| |
| void htrace_log_free(struct htrace_log *lg) |
| { |
| if (!lg) { |
| return; |
| } |
| pthread_mutex_destroy(&lg->lock); |
| if (lg->should_close) { |
| fclose(lg->fp); |
| } |
| free(lg); |
| } |
| |
| static void htrace_logv(struct htrace_log *lg, const char *fmt, va_list ap) |
| { |
| pthread_mutex_lock(&lg->lock); |
| vfprintf(lg->fp, fmt, ap); |
| pthread_mutex_unlock(&lg->lock); |
| } |
| |
| void htrace_log(struct htrace_log *lg, const char *fmt, ...) |
| { |
| va_list ap; |
| va_start(ap, fmt); |
| htrace_logv(lg, fmt, ap); |
| va_end(ap); |
| } |
| |
| // vim: ts=4:sw=4:et |