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>
58 #include <Viewer/fgviewer.hxx>
60 #include "globals.hxx"
61 #include "fg_props.hxx"
69 // forward declaration.
72 static bool fpeAbort = false;
73 static void initFPE();
75 #if defined(HAVE_FEENABLEEXCEPT)
76 static void handleFPE(int);
81 int except = fegetexcept();
82 feenableexcept(except | FE_DIVBYZERO | FE_INVALID);
84 signal(SIGFPE, handleFPE);
88 static void handleFPE(int)
90 feclearexcept(FE_ALL_EXCEPT);
91 signal(SIGFPE, handleFPE);
93 #elif defined(__linux__) && defined(__i386__)
95 static void handleFPE(int);
99 fpu_control_t fpe_flags = 0;
100 _FPU_GETCW(fpe_flags);
101 // fpe_flags &= ~_FPU_MASK_IM; // invalid operation
102 // fpe_flags &= ~_FPU_MASK_DM; // denormalized operand
103 // fpe_flags &= ~_FPU_MASK_ZM; // zero-divide
104 // fpe_flags &= ~_FPU_MASK_OM; // overflow
105 // fpe_flags &= ~_FPU_MASK_UM; // underflow
106 // fpe_flags &= ~_FPU_MASK_PM; // precision (inexact result)
107 _FPU_SETCW(fpe_flags);
108 signal(SIGFPE, handleFPE);
115 SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
118 static void initFPE()
124 int main ( int argc, char **argv );
125 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
126 LPSTR lpCmdLine, int nCmdShow) {
128 logbuf::has_no_console();
129 main( __argc, __argv );
135 #include <sys/sysmp.h>
139 * set the special "flush zero" bit (FS, bit 24) in the Control Status
140 * Register of the FPU of R4k and beyond so that the result of any
141 * underflowing operation will be clamped to zero, and no exception of
142 * any kind will be generated on the CPU. This has no effect on an
148 f.fc_word = get_fpc_csr();
149 f.fc_struct.flush = 1;
150 set_fpc_csr(f.fc_word);
154 static void fg_terminate() {
156 "Uncaught Exception: you should see a meaningful error message\n"
157 "here, but your GLUT (or SDL) library was apparently compiled\n"
158 "and/or linked without exception support. Please complain to\n"
164 int _bootstrap_OSInit;
166 // Main entry point; catch any exceptions that have made it this far.
167 int main ( int argc, char **argv ) {
169 // Don't show blocking "no disk in drive" error messages on Windows 7,
170 // silently return errors to application instead.
171 // See Microsoft MSDN #ms680621: "GUI apps should specify SEM_NOOPENFILEERRORBOX"
172 SetErrorMode(SEM_NOOPENFILEERRORBOX);
174 // Windows has no $HOME aka %HOME%, so we have to construct the full path.
175 homedir = ::getenv("APPDATA");
176 homedir.append("\\flightgear.org");
178 hostname = ::getenv( "COMPUTERNAME" );
180 // Unix(alike) systems
182 gethostname(_hostname, 256);
183 hostname = _hostname;
185 homedir = ::getenv( "HOME" );
187 signal(SIGPIPE, SIG_IGN);
190 #ifdef PTW32_STATIC_LIB
191 // Initialise static pthread win32 lib
192 pthread_win32_process_attach_np ();
194 _bootstrap_OSInit = 0;
196 #if defined(__FreeBSD__)
197 // Ignore floating-point exceptions on FreeBSD
198 signal(SIGFPE, SIG_IGN);
200 // Maybe Enable floating-point exceptions on Linux
201 for (int i = 0; i < argc; ++i) {
202 if (!strcmp("--enable-fpe", argv[i])) {
213 // Bind all non-rendering threads to CPU1
214 // This will reduce the jitter caused by them to an absolute minimum,
215 // but it will only work with superuser authority.
216 if ( geteuid() == 0 )
218 sysmp(MP_CLOCK, 0); // bind the timer only to CPU0
219 sysmp(MP_ISOLATE, 1 ); // Isolate CPU1
220 sysmp(MP_NONPREEMPTIVE, 1 ); // disable process time slicing on CPU1
224 // Enable floating-point exceptions for Windows
225 #if defined( _MSC_VER ) && defined( DEBUG )
226 // Christian, we should document what this does
227 _control87( _EM_INEXACT, _MCW_EM );
230 #if defined( HAVE_BC5PLUS )
231 _control87(MCW_EM, MCW_EM); /* defined in float.h */
234 bool fgviewer = false;
235 for (int i = 0; i < argc; ++i) {
236 if (!strcmp("--fgviewer", argv[i])) {
242 // FIXME: add other, more specific
245 std::set_terminate(fg_terminate);
246 atexit(fgExitCleanup);
248 fgviewerMain(argc, argv);
250 fgMainInit(argc, argv);
253 } catch (const sg_throwable &t) {
254 // We must use cerr rather than
255 // logging, since logging may be
257 cerr << "Fatal error: " << t.getFormattedMessage() << endl;
258 if (std::strlen(t.getOrigin()) != 0)
259 cerr << " (received from " << t.getOrigin() << ')' << endl;
261 } catch (const std::string &s) {
262 cerr << "Fatal error: " << s << endl;
264 } catch (const char *s) {
265 cerr << "Fatal error: " << s << endl;
268 cerr << "Unknown exception in the main loop. Aborting..." << endl;
270 perror("Possible cause");
276 // do some clean up on exit. Specifically we want to delete the sound-manager,
277 // so OpenAL device and context are released cleanly
278 void fgExitCleanup() {
280 if (_bootstrap_OSInit != 0)
281 fgSetMouseCursor(MOUSE_CURSOR_POINTER);