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>
31 #elif defined(__FreeBSD__)
39 #include <simgear/compiler.h>
40 #include <simgear/structure/exception.hxx>
41 #include <simgear/debug/logstream.hxx>
48 #include "globals.hxx"
59 # include <console.h> // -dw- for command line dialog
62 char *homedir = ::getenv( "HOME" );
63 char *hostname = ::getenv( "HOSTNAME" );
64 bool free_hostname = false;
66 // foreward declaration.
69 #if defined(__linux__) && defined(__i386__)
71 static void handleFPE (int);
76 fpu_control_t fpe_flags = 0;
77 _FPU_GETCW(fpe_flags);
78 // fpe_flags &= ~_FPU_MASK_IM; // invalid operation
79 // fpe_flags &= ~_FPU_MASK_DM; // denormalized operand
80 // fpe_flags &= ~_FPU_MASK_ZM; // zero-divide
81 // fpe_flags &= ~_FPU_MASK_OM; // overflow
82 // fpe_flags &= ~_FPU_MASK_UM; // underflow
83 // fpe_flags &= ~_FPU_MASK_PM; // precision (inexact result)
84 _FPU_SETCW(fpe_flags);
85 signal(SIGFPE, handleFPE);
92 SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
105 short CPSGetCurrentProcess(PSN *psn);
106 short CPSSetProcessName (PSN *psn, char *processname);
107 short CPSEnableForegroundOperation(PSN *psn, int _arg2, int _arg3, int _arg4, int _arg5);
108 short CPSSetFrontProcess(PSN *psn);
111 #define CPSEnableFG(psn) CPSEnableForegroundOperation(psn,0x03,0x3C,0x2C,0x1103)
116 int main ( int argc, char **argv );
117 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
118 LPSTR lpCmdLine, int nCmdShow) {
120 logbuf::has_no_console();
121 main( __argc, __argv );
127 #include <sys/sysmp.h>
131 * set the special "flush zero" bit (FS, bit 24) in the Control Status
132 * Register of the FPU of R4k and beyond so that the result of any
133 * underflowing operation will be clamped to zero, and no exception of
134 * any kind will be generated on the CPU. This has no effect on an
140 f.fc_word = get_fpc_csr();
141 f.fc_struct.flush = 1;
142 set_fpc_csr(f.fc_word);
146 int _bootstrap_OSInit;
148 // Main entry point; catch any exceptions that have made it this far.
149 int main ( int argc, char **argv ) {
151 _bootstrap_OSInit = 0;
153 #if defined(__linux__) && defined(__i386__)
154 // Enable floating-point exceptions for Linux/x86
156 #elif defined(__FreeBSD__)
157 // Ignore floating-point exceptions on FreeBSD
158 signal(SIGFPE, SIG_IGN);
164 // Bind all non-rendering threads to CPU1
165 // This will reduce the jitter caused by them to an absolute minimum,
166 // but it will only work with superuser authority.
167 if ( geteuid() == 0 )
169 sysmp(MP_CLOCK, 0); // bind the timer only to CPU0
170 sysmp(MP_ISOLATE, 1 ); // Isolate CPU1
171 sysmp(MP_NONPREEMPTIVE, 1 ); // disable process time slicing on CPU1
175 // Enable floating-point exceptions for Windows
176 #if defined( _MSC_VER ) && defined( DEBUG )
177 // Christian, we should document what this does
178 _control87( _EM_INEXACT, _MCW_EM );
181 #if defined( HAVE_BC5PLUS )
182 _control87(MCW_EM, MCW_EM); /* defined in float.h */
185 // Keyboard focus hack
186 #if defined(__APPLE__) && !defined(OSX_BUNDLE)
190 fgOSInit (&argc, argv);
193 CPSGetCurrentProcess(&psn);
194 CPSSetProcessName(&psn, "FlightGear");
196 CPSSetFrontProcess(&psn);
200 // FIXME: add other, more specific
203 atexit(fgExitCleanup);
204 fgMainInit(argc, argv);
205 } catch (const sg_throwable &t) {
206 // We must use cerr rather than
207 // logging, since logging may be
209 cerr << "Fatal error: " << t.getFormattedMessage() << endl;
210 if (!t.getOrigin().empty())
211 cerr << " (received from " << t.getOrigin() << ')' << endl;
213 } catch (const string &s) {
214 cerr << "Fatal error: " << s << endl;
217 cerr << "Unknown exception in the main loop. Aborting..." << endl;
219 perror("Possible cause");
225 // do some clean up on exit. Specifically we want to call alutExit()
226 // which happens in the sound manager destructor.
227 void fgExitCleanup() {
229 if (_bootstrap_OSInit != 0)
230 fgSetMouseCursor(MOUSE_CURSOR_POINTER);
234 if (free_hostname && hostname != NULL)