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"
58 # include <console.h> // -dw- for command line dialog
61 char *homedir = ::getenv( "HOME" );
62 char *hostname = ::getenv( "HOSTNAME" );
63 bool free_hostname = false;
65 // foreward declaration.
68 #if defined(__linux__) && defined(__i386__)
70 static void handleFPE (int);
75 fpu_control_t fpe_flags = 0;
76 _FPU_GETCW(fpe_flags);
77 // fpe_flags &= ~_FPU_MASK_IM; // invalid operation
78 // fpe_flags &= ~_FPU_MASK_DM; // denormalized operand
79 // fpe_flags &= ~_FPU_MASK_ZM; // zero-divide
80 // fpe_flags &= ~_FPU_MASK_OM; // overflow
81 // fpe_flags &= ~_FPU_MASK_UM; // underflow
82 // fpe_flags &= ~_FPU_MASK_PM; // precision (inexact result)
83 _FPU_SETCW(fpe_flags);
84 signal(SIGFPE, handleFPE);
91 SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
104 short CPSGetCurrentProcess(PSN *psn);
105 short CPSSetProcessName (PSN *psn, char *processname);
106 short CPSEnableForegroundOperation(PSN *psn, int _arg2, int _arg3, int _arg4, int _arg5);
107 short CPSSetFrontProcess(PSN *psn);
110 #define CPSEnableFG(psn) CPSEnableForegroundOperation(psn,0x03,0x3C,0x2C,0x1103)
115 int main ( int argc, char **argv );
116 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
117 LPSTR lpCmdLine, int nCmdShow) {
119 logbuf::has_no_console();
120 main( __argc, __argv );
126 #include <sys/sysmp.h>
130 * set the special "flush zero" bit (FS, bit 24) in the Control Status
131 * Register of the FPU of R4k and beyond so that the result of any
132 * underflowing operation will be clamped to zero, and no exception of
133 * any kind will be generated on the CPU. This has no effect on an
139 f.fc_word = get_fpc_csr();
140 f.fc_struct.flush = 1;
141 set_fpc_csr(f.fc_word);
145 static void fg_terminate() {
147 "Uncaught Exception: you should see a meaningful error message\n"
148 "here, but your GLUT (or SDL) library was apparently compiled\n"
149 "and/or linked without exception support. Please complain to\n"
155 int _bootstrap_OSInit;
157 // Main entry point; catch any exceptions that have made it this far.
158 int main ( int argc, char **argv ) {
160 #ifdef PTW32_STATIC_LIB
161 // Initialise static pthread win32 lib
162 pthread_win32_process_attach_np ();
164 _bootstrap_OSInit = 0;
166 #if defined(__linux__) && defined(__i386__)
167 // Enable floating-point exceptions for Linux/x86
169 #elif defined(__FreeBSD__)
170 // Ignore floating-point exceptions on FreeBSD
171 signal(SIGFPE, SIG_IGN);
173 signal(SIGPIPE, SIG_IGN);
178 // Bind all non-rendering threads to CPU1
179 // This will reduce the jitter caused by them to an absolute minimum,
180 // but it will only work with superuser authority.
181 if ( geteuid() == 0 )
183 sysmp(MP_CLOCK, 0); // bind the timer only to CPU0
184 sysmp(MP_ISOLATE, 1 ); // Isolate CPU1
185 sysmp(MP_NONPREEMPTIVE, 1 ); // disable process time slicing on CPU1
189 // Enable floating-point exceptions for Windows
190 #if defined( _MSC_VER ) && defined( DEBUG )
191 // Christian, we should document what this does
192 _control87( _EM_INEXACT, _MCW_EM );
195 #if defined( HAVE_BC5PLUS )
196 _control87(MCW_EM, MCW_EM); /* defined in float.h */
199 // Keyboard focus hack
200 #if defined(__APPLE__) && !defined(OSX_BUNDLE)
204 fgOSInit (&argc, argv);
207 CPSGetCurrentProcess(&psn);
208 CPSSetProcessName(&psn, "FlightGear");
210 CPSSetFrontProcess(&psn);
214 // FIXME: add other, more specific
217 std::set_terminate(fg_terminate);
218 atexit(fgExitCleanup);
219 fgMainInit(argc, argv);
220 } catch (const sg_throwable &t) {
221 // We must use cerr rather than
222 // logging, since logging may be
224 cerr << "Fatal error: " << t.getFormattedMessage() << endl;
225 if (!t.getOrigin().empty())
226 cerr << " (received from " << t.getOrigin() << ')' << endl;
228 } catch (const string &s) {
229 cerr << "Fatal error: " << s << endl;
231 } catch (const char *s) {
232 cerr << "Fatal error: " << s << endl;
235 cerr << "Unknown exception in the main loop. Aborting..." << endl;
237 perror("Possible cause");
243 // do some clean up on exit. Specifically we want to call alutExit()
244 // which happens in the sound manager destructor.
245 void fgExitCleanup() {
247 if (_bootstrap_OSInit != 0)
248 fgSetMouseCursor(MOUSE_CURSOR_POINTER);
252 if (free_hostname && hostname != NULL)