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.
28 #if defined(__linux__) && defined(__i386__)
29 # include <fpu_control.h>
37 #include <simgear/compiler.h>
38 #include <simgear/structure/exception.hxx>
39 #include <simgear/debug/logstream.hxx>
46 #include "globals.hxx"
57 char *homedir = ::getenv( "HOME" );
58 char *hostname = ::getenv( "HOSTNAME" );
59 bool free_hostname = false;
61 // foreward declaration.
64 #if defined(__linux__) && defined(__i386__)
66 static void handleFPE (int);
71 fpu_control_t fpe_flags = 0;
72 _FPU_GETCW(fpe_flags);
73 // fpe_flags &= ~_FPU_MASK_IM; // invalid operation
74 // fpe_flags &= ~_FPU_MASK_DM; // denormalized operand
75 // fpe_flags &= ~_FPU_MASK_ZM; // zero-divide
76 // fpe_flags &= ~_FPU_MASK_OM; // overflow
77 // fpe_flags &= ~_FPU_MASK_UM; // underflow
78 // fpe_flags &= ~_FPU_MASK_PM; // precision (inexact result)
79 _FPU_SETCW(fpe_flags);
80 signal(SIGFPE, handleFPE);
87 SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
100 short CPSGetCurrentProcess(PSN *psn);
101 short CPSSetProcessName (PSN *psn, char *processname);
102 short CPSEnableForegroundOperation(PSN *psn, int _arg2, int _arg3, int _arg4, int _arg5);
103 short CPSSetFrontProcess(PSN *psn);
106 #define CPSEnableFG(psn) CPSEnableForegroundOperation(psn,0x03,0x3C,0x2C,0x1103)
111 int main ( int argc, char **argv );
112 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
113 LPSTR lpCmdLine, int nCmdShow) {
115 logbuf::has_no_console();
116 main( __argc, __argv );
122 #include <sys/sysmp.h>
126 * set the special "flush zero" bit (FS, bit 24) in the Control Status
127 * Register of the FPU of R4k and beyond so that the result of any
128 * underflowing operation will be clamped to zero, and no exception of
129 * any kind will be generated on the CPU. This has no effect on an
135 f.fc_word = get_fpc_csr();
136 f.fc_struct.flush = 1;
137 set_fpc_csr(f.fc_word);
141 static void fg_terminate() {
143 "Uncaught Exception: you should see a meaningful error message\n"
144 "here, but your GLUT (or SDL) library was apparently compiled\n"
145 "and/or linked without exception support. Please complain to\n"
151 int _bootstrap_OSInit;
153 // Main entry point; catch any exceptions that have made it this far.
154 int main ( int argc, char **argv ) {
156 #ifdef PTW32_STATIC_LIB
157 // Initialise static pthread win32 lib
158 pthread_win32_process_attach_np ();
160 _bootstrap_OSInit = 0;
162 #if defined(__linux__) && defined(__i386__)
163 // Enable floating-point exceptions for Linux/x86
165 #elif defined(__FreeBSD__)
166 // Ignore floating-point exceptions on FreeBSD
167 signal(SIGFPE, SIG_IGN);
170 signal(SIGPIPE, SIG_IGN);
176 // Bind all non-rendering threads to CPU1
177 // This will reduce the jitter caused by them to an absolute minimum,
178 // but it will only work with superuser authority.
179 if ( geteuid() == 0 )
181 sysmp(MP_CLOCK, 0); // bind the timer only to CPU0
182 sysmp(MP_ISOLATE, 1 ); // Isolate CPU1
183 sysmp(MP_NONPREEMPTIVE, 1 ); // disable process time slicing on CPU1
187 // Enable floating-point exceptions for Windows
188 #if defined( _MSC_VER ) && defined( DEBUG )
189 // Christian, we should document what this does
190 _control87( _EM_INEXACT, _MCW_EM );
193 #if defined( HAVE_BC5PLUS )
194 _control87(MCW_EM, MCW_EM); /* defined in float.h */
197 // Keyboard focus hack
198 #if defined(__APPLE__) && !defined(OSX_BUNDLE)
202 fgOSInit (&argc, argv);
205 CPSGetCurrentProcess(&psn);
206 CPSSetProcessName(&psn, "FlightGear");
208 CPSSetFrontProcess(&psn);
212 // FIXME: add other, more specific
215 std::set_terminate(fg_terminate);
216 atexit(fgExitCleanup);
217 fgMainInit(argc, argv);
218 } catch (const sg_throwable &t) {
219 // We must use cerr rather than
220 // logging, since logging may be
222 cerr << "Fatal error: " << t.getFormattedMessage() << endl;
223 if (!t.getOrigin().empty())
224 cerr << " (received from " << t.getOrigin() << ')' << endl;
226 } catch (const string &s) {
227 cerr << "Fatal error: " << s << endl;
229 } catch (const char *s) {
230 cerr << "Fatal error: " << s << endl;
233 cerr << "Unknown exception in the main loop. Aborting..." << endl;
235 perror("Possible cause");
241 // do some clean up on exit. Specifically we want to call alutExit()
242 // which happens in the sound manager destructor.
243 void fgExitCleanup() {
245 if (_bootstrap_OSInit != 0)
246 fgSetMouseCursor(MOUSE_CURSOR_POINTER);
250 if (free_hostname && hostname != NULL)