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>
59 #include <Viewer/fgviewer.hxx>
61 #include "globals.hxx"
62 #include "fg_props.hxx"
70 // forward declaration.
73 static bool fpeAbort = false;
74 static void initFPE();
76 #if defined(HAVE_FEENABLEEXCEPT)
77 static void handleFPE(int);
82 int except = fegetexcept();
83 feenableexcept(except | FE_DIVBYZERO | FE_INVALID);
85 signal(SIGFPE, handleFPE);
89 static void handleFPE(int)
91 feclearexcept(FE_ALL_EXCEPT);
92 signal(SIGFPE, handleFPE);
94 #elif defined(__linux__) && defined(__i386__)
96 static void handleFPE(int);
100 fpu_control_t fpe_flags = 0;
101 _FPU_GETCW(fpe_flags);
102 // fpe_flags &= ~_FPU_MASK_IM; // invalid operation
103 // fpe_flags &= ~_FPU_MASK_DM; // denormalized operand
104 // fpe_flags &= ~_FPU_MASK_ZM; // zero-divide
105 // fpe_flags &= ~_FPU_MASK_OM; // overflow
106 // fpe_flags &= ~_FPU_MASK_UM; // underflow
107 // fpe_flags &= ~_FPU_MASK_PM; // precision (inexact result)
108 _FPU_SETCW(fpe_flags);
109 signal(SIGFPE, handleFPE);
116 SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
119 static void initFPE()
125 int main ( int argc, char **argv );
126 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
127 LPSTR lpCmdLine, int nCmdShow) {
129 logbuf::has_no_console();
130 main( __argc, __argv );
136 #include <sys/sysmp.h>
140 * set the special "flush zero" bit (FS, bit 24) in the Control Status
141 * Register of the FPU of R4k and beyond so that the result of any
142 * underflowing operation will be clamped to zero, and no exception of
143 * any kind will be generated on the CPU. This has no effect on an
149 f.fc_word = get_fpc_csr();
150 f.fc_struct.flush = 1;
151 set_fpc_csr(f.fc_word);
155 static void fg_terminate() {
157 "Uncaught Exception: you should see a meaningful error message\n"
158 "here, but your GLUT (or SDL) library was apparently compiled\n"
159 "and/or linked without exception support. Please complain to\n"
165 int _bootstrap_OSInit;
167 // Main entry point; catch any exceptions that have made it this far.
168 int main ( int argc, char **argv ) {
170 // Don't show blocking "no disk in drive" error messages on Windows 7,
171 // silently return errors to application instead.
172 // See Microsoft MSDN #ms680621: "GUI apps should specify SEM_NOOPENFILEERRORBOX"
173 SetErrorMode(SEM_NOOPENFILEERRORBOX);
175 // Windows has no $HOME aka %HOME%, so we have to construct the full path.
176 homedir = ::getenv("APPDATA");
177 homedir.append("\\flightgear.org");
179 hostname = ::getenv( "COMPUTERNAME" );
181 // Unix(alike) systems
183 gethostname(_hostname, 256);
184 hostname = _hostname;
186 homedir = ::getenv( "HOME" );
188 signal(SIGPIPE, SIG_IGN);
191 #ifdef PTW32_STATIC_LIB
192 // Initialise static pthread win32 lib
193 pthread_win32_process_attach_np ();
195 _bootstrap_OSInit = 0;
197 #if defined(__FreeBSD__)
198 // Ignore floating-point exceptions on FreeBSD
199 signal(SIGFPE, SIG_IGN);
201 // Maybe Enable floating-point exceptions on Linux
202 for (int i = 0; i < argc; ++i) {
203 if (!strcmp("--enable-fpe", argv[i])) {
214 // Bind all non-rendering threads to CPU1
215 // This will reduce the jitter caused by them to an absolute minimum,
216 // but it will only work with superuser authority.
217 if ( geteuid() == 0 )
219 sysmp(MP_CLOCK, 0); // bind the timer only to CPU0
220 sysmp(MP_ISOLATE, 1 ); // Isolate CPU1
221 sysmp(MP_NONPREEMPTIVE, 1 ); // disable process time slicing on CPU1
225 // Enable floating-point exceptions for Windows
226 #if defined( _MSC_VER ) && defined( DEBUG )
227 // Christian, we should document what this does
228 _control87( _EM_INEXACT, _MCW_EM );
231 #if defined( HAVE_BC5PLUS )
232 _control87(MCW_EM, MCW_EM); /* defined in float.h */
235 bool fgviewer = false;
236 for (int i = 0; i < argc; ++i) {
237 if (!strcmp("--fgviewer", argv[i])) {
243 // FIXME: add other, more specific
246 std::set_terminate(fg_terminate);
247 atexit(fgExitCleanup);
249 fgviewerMain(argc, argv);
251 fgMainInit(argc, argv);
254 } catch (const sg_throwable &t) {
255 // We must use cerr rather than
256 // logging, since logging may be
258 cerr << "Fatal error: " << t.getFormattedMessage() << endl;
259 if (std::strlen(t.getOrigin()) != 0)
260 cerr << " (received from " << t.getOrigin() << ')' << endl;
262 } catch (const string &s) {
263 cerr << "Fatal error: " << s << endl;
265 } catch (const char *s) {
266 cerr << "Fatal error: " << s << endl;
269 cerr << "Unknown exception in the main loop. Aborting..." << endl;
271 perror("Possible cause");
277 // do some clean up on exit. Specifically we want to call alutExit()
278 // which happens in the sound manager destructor.
279 void fgExitCleanup() {
281 if (_bootstrap_OSInit != 0)
282 fgSetMouseCursor(MOUSE_CURSOR_POINTER);