1 // bootstrap.cxx -- bootstrap routines: main()
3 // Written by Curtis Olson, started May 1997.
5 // Copyright (C) 1997 - 2002 Curtis L. Olson - http://www.flightgear.org/~curt
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
32 #if defined(HAVE_FEENABLEEXCEPT)
37 #elif defined(__linux__) && defined(__i386__)
38 # include <fpu_control.h>
42 # include <unistd.h> // for gethostname()
50 #include <simgear/compiler.h>
51 #include <simgear/structure/exception.hxx>
52 #include <simgear/debug/logstream.hxx>
53 #include <simgear/math/SGMath.hxx>
60 #include <Viewer/fgviewer.hxx>
62 #include "globals.hxx"
63 #include "fg_props.hxx"
71 // forward declaration.
74 static bool fpeAbort = false;
75 static void initFPE();
77 #if defined(HAVE_FEENABLEEXCEPT)
78 static void handleFPE(int);
83 int except = fegetexcept();
84 feenableexcept(except | FE_DIVBYZERO | FE_INVALID);
86 signal(SIGFPE, handleFPE);
90 static void handleFPE(int)
92 feclearexcept(FE_ALL_EXCEPT);
93 signal(SIGFPE, handleFPE);
95 #elif defined(__linux__) && defined(__i386__)
97 static void handleFPE(int);
101 fpu_control_t fpe_flags = 0;
102 _FPU_GETCW(fpe_flags);
103 // fpe_flags &= ~_FPU_MASK_IM; // invalid operation
104 // fpe_flags &= ~_FPU_MASK_DM; // denormalized operand
105 // fpe_flags &= ~_FPU_MASK_ZM; // zero-divide
106 // fpe_flags &= ~_FPU_MASK_OM; // overflow
107 // fpe_flags &= ~_FPU_MASK_UM; // underflow
108 // fpe_flags &= ~_FPU_MASK_PM; // precision (inexact result)
109 _FPU_SETCW(fpe_flags);
110 signal(SIGFPE, handleFPE);
117 SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
120 static void initFPE()
126 int main ( int argc, char **argv );
127 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
128 LPSTR lpCmdLine, int nCmdShow) {
130 logbuf::has_no_console();
131 main( __argc, __argv );
137 #include <sys/sysmp.h>
141 * set the special "flush zero" bit (FS, bit 24) in the Control Status
142 * Register of the FPU of R4k and beyond so that the result of any
143 * underflowing operation will be clamped to zero, and no exception of
144 * any kind will be generated on the CPU. This has no effect on an
150 f.fc_word = get_fpc_csr();
151 f.fc_struct.flush = 1;
152 set_fpc_csr(f.fc_word);
156 static void fg_terminate() {
158 "Uncaught Exception: you should see a meaningful error message\n"
159 "here, but your GLUT (or SDL) library was apparently compiled\n"
160 "and/or linked without exception support. Please complain to\n"
166 int _bootstrap_OSInit;
168 // Main entry point; catch any exceptions that have made it this far.
169 int main ( int argc, char **argv ) {
171 // Don't show blocking "no disk in drive" error messages on Windows 7,
172 // silently return errors to application instead.
173 // See Microsoft MSDN #ms680621: "GUI apps should specify SEM_NOOPENFILEERRORBOX"
174 SetErrorMode(SEM_NOOPENFILEERRORBOX);
176 // Windows has no $HOME aka %HOME%, so we have to construct the full path.
177 homedir = ::getenv("APPDATA");
178 homedir.append("\\flightgear.org");
180 hostname = ::getenv( "COMPUTERNAME" );
182 // Unix(alike) systems
184 gethostname(_hostname, 256);
185 hostname = _hostname;
187 homedir = ::getenv( "HOME" );
189 signal(SIGPIPE, SIG_IGN);
192 #ifdef PTW32_STATIC_LIB
193 // Initialise static pthread win32 lib
194 pthread_win32_process_attach_np ();
196 _bootstrap_OSInit = 0;
198 #if defined(__FreeBSD__)
199 // Ignore floating-point exceptions on FreeBSD
200 signal(SIGFPE, SIG_IGN);
202 // Maybe Enable floating-point exceptions on Linux
203 for (int i = 0; i < argc; ++i) {
204 if (!strcmp("--enable-fpe", argv[i])) {
215 // Bind all non-rendering threads to CPU1
216 // This will reduce the jitter caused by them to an absolute minimum,
217 // but it will only work with superuser authority.
218 if ( geteuid() == 0 )
220 sysmp(MP_CLOCK, 0); // bind the timer only to CPU0
221 sysmp(MP_ISOLATE, 1 ); // Isolate CPU1
222 sysmp(MP_NONPREEMPTIVE, 1 ); // disable process time slicing on CPU1
226 // Enable floating-point exceptions for Windows
227 #if defined( _MSC_VER ) && defined( DEBUG )
228 // Christian, we should document what this does
229 _control87( _EM_INEXACT, _MCW_EM );
232 #if defined( HAVE_BC5PLUS )
233 _control87(MCW_EM, MCW_EM); /* defined in float.h */
236 bool fgviewer = false;
237 for (int i = 0; i < argc; ++i) {
238 if (!strcmp("--fgviewer", argv[i])) {
244 // FIXME: add other, more specific
247 std::set_terminate(fg_terminate);
248 atexit(fgExitCleanup);
250 fgviewerMain(argc, argv);
252 fgMainInit(argc, argv);
255 } catch (const sg_throwable &t) {
256 // We must use cerr rather than
257 // logging, since logging may be
259 cerr << "Fatal error: " << t.getFormattedMessage() << endl;
260 if (std::strlen(t.getOrigin()) != 0)
261 cerr << " (received from " << t.getOrigin() << ')' << endl;
263 } catch (const string &s) {
264 cerr << "Fatal error: " << s << endl;
266 } catch (const char *s) {
267 cerr << "Fatal error: " << s << endl;
270 cerr << "Unknown exception in the main loop. Aborting..." << endl;
272 perror("Possible cause");
278 // do some clean up on exit. Specifically we want to call alutExit()
279 // which happens in the sound manager destructor.
280 void fgExitCleanup() {
282 if (_bootstrap_OSInit != 0)
283 fgSetMouseCursor(MOUSE_CURSOR_POINTER);