83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
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/*
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* Copyright (C) 2007-2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Some OS specific dribs and drabs (locking etc).
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*/
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#if !defined(_WIN32)
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#include <pthread.h>
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#endif
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#include <private/android_filesystem_config.h>
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#include "logger.h"
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LIBLOG_HIDDEN uid_t __android_log_uid()
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{
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#if defined(_WIN32)
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return AID_SYSTEM;
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#else
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static uid_t last_uid = AID_ROOT; /* logd *always* starts up as AID_ROOT */
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if (last_uid == AID_ROOT) { /* have we called to get the UID yet? */
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last_uid = getuid();
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}
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return last_uid;
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#endif
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}
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LIBLOG_HIDDEN pid_t __android_log_pid()
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{
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static pid_t last_pid = (pid_t) -1;
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if (last_pid == (pid_t) -1) {
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last_pid = getpid();
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}
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return last_pid;
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}
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#if !defined(_WIN32)
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static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
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#endif
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LIBLOG_HIDDEN void __android_log_lock()
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{
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#if !defined(_WIN32)
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/*
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* If we trigger a signal handler in the middle of locked activity and the
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* signal handler logs a message, we could get into a deadlock state.
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*/
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pthread_mutex_lock(&log_init_lock);
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#endif
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}
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LIBLOG_HIDDEN int __android_log_trylock()
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{
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#if !defined(_WIN32)
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return pthread_mutex_trylock(&log_init_lock);
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#else
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return 0;
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#endif
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}
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LIBLOG_HIDDEN void __android_log_unlock()
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{
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#if !defined(_WIN32)
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pthread_mutex_unlock(&log_init_lock);
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#endif
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}
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