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flightgear/src/Main/bootstrap.cxx

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// bootstrap.cxx -- bootstrap routines: main()
//
// Written by Curtis Olson, started May 1997.
//
// Copyright (C) 1997 - 2002 Curtis L. Olson - http://www.flightgear.org/~curt
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//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
// $Id$
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#if defined(HAVE_FEENABLEEXCEPT)
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <fenv.h>
#elif defined(__linux__) && defined(__i386__)
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# include <fpu_control.h>
#endif
#include <errno.h>
#include <signal.h>
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#include <stdlib.h>
#include <stdio.h>
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#include <simgear/compiler.h>
#include <simgear/structure/exception.hxx>
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#include <simgear/debug/logstream.hxx>
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#include <simgear/math/SGMath.hxx>
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#include <cstring>
#include <iostream>
using std::cerr;
using std::endl;
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#include "main.hxx"
#include "globals.hxx"
#include "fg_props.hxx"
#include "fgviewer.hxx"
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#include "fg_os.hxx"
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#ifdef _MSC_VER
char homepath[256] = "";
char * homedir = homepath;
char *hostname = ::getenv( "COMPUTERNAME" );
#else
char *homedir = ::getenv( "HOME" );
char *hostname = ::getenv( "HOSTNAME" );
#endif
bool free_hostname = false;
// foreward declaration.
void fgExitCleanup();
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static bool fpeAbort = false;
static void handleFPE(int);
static void initFPE();
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#if defined(HAVE_FEENABLEEXCEPT)
static void
initFPE ()
{
if (fpeAbort) {
int except = fegetexcept();
feenableexcept(except | FE_DIVBYZERO | FE_INVALID);
} else {
signal(SIGFPE, handleFPE);
}
}
static void handleFPE(int)
{
feclearexcept(FE_ALL_EXCEPT);
signal(SIGFPE, handleFPE);
}
#elif defined(__linux__) && defined(__i386__)
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static void
initFPE ()
{
fpu_control_t fpe_flags = 0;
_FPU_GETCW(fpe_flags);
// fpe_flags &= ~_FPU_MASK_IM; // invalid operation
// fpe_flags &= ~_FPU_MASK_DM; // denormalized operand
// fpe_flags &= ~_FPU_MASK_ZM; // zero-divide
// fpe_flags &= ~_FPU_MASK_OM; // overflow
// fpe_flags &= ~_FPU_MASK_UM; // underflow
// fpe_flags &= ~_FPU_MASK_PM; // precision (inexact result)
_FPU_SETCW(fpe_flags);
signal(SIGFPE, handleFPE);
}
static void
handleFPE (int num)
{
initFPE();
SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
}
#else
static void handleFPE(int)
{
}
static void initFPE()
{
}
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#endif
#ifdef _MSC_VER
int main ( int argc, char **argv );
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow) {
logbuf::has_no_console();
main( __argc, __argv );
}
#endif
#if defined( sgi )
#include <sys/fpu.h>
#include <sys/sysmp.h>
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#include <unistd.h>
/*
* set the special "flush zero" bit (FS, bit 24) in the Control Status
* Register of the FPU of R4k and beyond so that the result of any
* underflowing operation will be clamped to zero, and no exception of
* any kind will be generated on the CPU. This has no effect on an
* R3000.
*/
void flush_fpe(void)
{
union fpc_csr f;
f.fc_word = get_fpc_csr();
f.fc_struct.flush = 1;
set_fpc_csr(f.fc_word);
}
#endif
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static void fg_terminate() {
cerr << endl <<
"Uncaught Exception: you should see a meaningful error message\n"
"here, but your GLUT (or SDL) library was apparently compiled\n"
"and/or linked without exception support. Please complain to\n"
"its provider!"
<< endl << endl;
abort();
}
int _bootstrap_OSInit;
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// Main entry point; catch any exceptions that have made it this far.
int main ( int argc, char **argv ) {
#if _MSC_VER
// Windows has no $HOME aka %HOME%, so we have to construct the full path.
// make sure it fits into the buffer. Max. path length is 255, but who knows
// what's in these environment variables?
homepath[sizeof(homepath)-1] = 0;
strncpy( homepath, ::getenv("APPDATA"), sizeof(homepath)-1 );
strncat( homepath, "\\flightgear.org", sizeof(homepath)-strlen(homepath)-1 );
#endif
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#ifdef PTW32_STATIC_LIB
// Initialise static pthread win32 lib
pthread_win32_process_attach_np ();
#endif
_bootstrap_OSInit = 0;
#if defined(__FreeBSD__)
// Ignore floating-point exceptions on FreeBSD
signal(SIGFPE, SIG_IGN);
#else
// Maybe Enable floating-point exceptions on Linux
for (int i = 0; i < argc; ++i) {
if (!strcmp("--enable-fpe", argv[i])) {
fpeAbort = true;
break;
}
}
initFPE();
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#endif
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#ifndef _WIN32
signal(SIGPIPE, SIG_IGN);
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#endif
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#if defined(sgi)
flush_fpe();
// Bind all non-rendering threads to CPU1
// This will reduce the jitter caused by them to an absolute minimum,
// but it will only work with superuser authority.
if ( geteuid() == 0 )
{
sysmp(MP_CLOCK, 0); // bind the timer only to CPU0
sysmp(MP_ISOLATE, 1 ); // Isolate CPU1
sysmp(MP_NONPREEMPTIVE, 1 ); // disable process time slicing on CPU1
}
#endif
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// Enable floating-point exceptions for Windows
#if defined( _MSC_VER ) && defined( DEBUG )
// Christian, we should document what this does
_control87( _EM_INEXACT, _MCW_EM );
#endif
#if defined( HAVE_BC5PLUS )
_control87(MCW_EM, MCW_EM); /* defined in float.h */
#endif
bool fgviewer = false;
for (int i = 0; i < argc; ++i) {
if (!strcmp("--fgviewer", argv[i])) {
fgviewer = true;
break;
}
}
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// FIXME: add other, more specific
// exceptions.
try {
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std::set_terminate(fg_terminate);
atexit(fgExitCleanup);
if (fgviewer)
fgviewerMain(argc, argv);
else
fgMainInit(argc, argv);
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} catch (const sg_throwable &t) {
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// We must use cerr rather than
// logging, since logging may be
// disabled.
cerr << "Fatal error: " << t.getFormattedMessage() << endl;
if (std::strlen(t.getOrigin()) != 0)
cerr << " (received from " << t.getOrigin() << ')' << endl;
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} catch (const string &s) {
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cerr << "Fatal error: " << s << endl;
} catch (const char *s) {
cerr << "Fatal error: " << s << endl;
} catch (...) {
cerr << "Unknown exception in the main loop. Aborting..." << endl;
if (errno)
perror("Possible cause");
}
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return 0;
}
// do some clean up on exit. Specifically we want to call alutExit()
// which happens in the sound manager destructor.
void fgExitCleanup() {
if (_bootstrap_OSInit != 0)
fgSetMouseCursor(MOUSE_CURSOR_POINTER);
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delete globals;
if (free_hostname && hostname != NULL)
free(hostname);
}
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