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/**
* 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 "LibCSymTable.h"
#include <unistd.h> // needed for _POSIX_MONOTONIC_CLOCK
#define LOAD_SYM(sym) \
sym=(sym##_sig)dlsym(handle,#sym); \
assert("Unable to load "#sym" from libc"&&sym)
LibCSymTable& LibCSymTable::instance(){
static LibCSymTable tbl;
return tbl;
}
//******************************************************************************
// preload original libc symbols
LibCSymTable::LibCSymTable()
{
void* handle=getHandle();
LOAD_SYM(gethostbyname);
LOAD_SYM(calloc);
LOAD_SYM(realloc);
LOAD_SYM(free);
LOAD_SYM(random);
LOAD_SYM(srandom);
LOAD_SYM(printf);
LOAD_SYM(socket);
LOAD_SYM(close);
LOAD_SYM(getsockopt);
LOAD_SYM(setsockopt);
LOAD_SYM(fcntl);
LOAD_SYM(connect);
LOAD_SYM(send);
LOAD_SYM(recv);
LOAD_SYM(select);
LOAD_SYM(poll);
LOAD_SYM(gettimeofday);
#ifdef _POSIX_MONOTONIC_CLOCK
LOAD_SYM(clock_gettime);
#endif
#ifdef THREADED
LOAD_SYM(pthread_create);
LOAD_SYM(pthread_detach);
LOAD_SYM(pthread_cond_broadcast);
LOAD_SYM(pthread_cond_destroy);
LOAD_SYM(pthread_cond_init);
LOAD_SYM(pthread_cond_signal);
LOAD_SYM(pthread_cond_timedwait);
LOAD_SYM(pthread_cond_wait);
LOAD_SYM(pthread_join);
LOAD_SYM(pthread_mutex_destroy);
LOAD_SYM(pthread_mutex_init);
LOAD_SYM(pthread_mutex_lock);
LOAD_SYM(pthread_mutex_trylock);
LOAD_SYM(pthread_mutex_unlock);
#endif
}
void* LibCSymTable::getHandle(){
static void* handle=0;
if(!handle){
#ifdef __CYGWIN__
handle=dlopen("cygwin1.dll",RTLD_LAZY);
assert("Unable to dlopen global sym table"&&handle);
#else
handle=RTLD_NEXT;
#endif
}
return handle;
}
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