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70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/** \brief Syslog to stderr wrapper for Unix-like systems
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*
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* By dynamically linking this module into an executable, any message sent to the system logs
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* via the POSIX or Linux API is instead redirected to standard error.
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*
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* Compile this program with `cc -fPID -shared -o syslog2stderr.so syslog2stderr.c -ldl`
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* and load it dynamically when running `myprogram` with
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* `LD_PRELOAD=/path/to/syslog2stderr.so myprogram`.
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* On macOS, replace `LD_PRELOAD` by `DYLD_PRELOAD`.
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*/
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/**
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* Copyright (C) 2017-2018, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* 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, WITHOUT
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* 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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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#include <dlfcn.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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void openlog( const char *ident, int option, int facility )
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{
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(void) ident;
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(void) option;
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(void) facility;
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}
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/* POSIX API */
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void syslog( int priority, const char *format, ... )
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{
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va_list args;
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va_start( args, format );
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vfprintf( stderr, format, args );
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va_end( args );
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}
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/* Linux ABI
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* http://refspecs.linux-foundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/libc---syslog-chk-1.html
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*/
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void __syslog_chk( int priority, int flag, const char *format, ... )
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{
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va_list args;
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(int) flag;
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va_start( args, format );
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vfprintf( stderr, format, args );
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fputc( '\n', stderr );
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va_end( args );
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}
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void closelog( void )
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{
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/* no-op */
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}
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