main-modular.cc
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上传日期:2015-12-11
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- /*
- * Copyright (c) 2007 Regents of the SIGNET lab, University of Padova.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University of Padova (SIGNET lab) nor the
- * names of its contributors may be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
- * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- /**
- * This file is used when ns is built into two separate components:
- * 1) a shared library which includes all the code of the simulator
- * 2) a tiny executable (built from this file) which has the only purpose of
- * loading the library described above
- * This setup is needed to support the loading of dynamic libraries on
- * windows systems (e.g. cygwin), in order to overcome some well-known limitations
- * of the DLL format (in particular, the fact that an executable cannot export
- * its simbols to the libraries that it loads).
- * For most other operating systems, common/main-monolithic.cc is used instead
- * of this file.
- * The selection of the main file used for the build is made in the Makefile,
- * depending on the operating system (as detected by ./configure)
- */
- #include<stdio.h>
- #include <dlfcn.h>
- int
- main(int argc, char** argv)
- {
- void *handle = dlopen(NSLIBNAME, RTLD_LAZY);
- if(!handle)
- {
- fprintf(stderr,"Error: Cannot open shared library: %sn", dlerror());
- return 1;
- }
- typedef int (*nslibmain_t)(int,char**);
- dlerror();
- nslibmain_t nslibmain = (nslibmain_t)dlsym(handle, "nslibmain");
- const char* dlsym_error=dlerror();
- if(dlsym_error)
- {
- fprintf(stderr,"Cannot load symbol libmain: %sn", dlsym_error);
- dlclose(handle);
- return 1;
- }
- nslibmain(argc,argv);
- dlclose(handle);
- return 0; /* Needed only to prevent compiler warning. */
- }