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>
46 #include <simgear/compiler.h>
47 #include <simgear/structure/exception.hxx>
48 #include <simgear/debug/logstream.hxx>
49 #include <simgear/math/SGMath.hxx>
57 #include "globals.hxx"
58 #include "fg_props.hxx"
59 #include "fgviewer.hxx"
65 char homepath[256] = "";
66 char * homedir = homepath;
67 char *hostname = ::getenv( "COMPUTERNAME" );
69 char *homedir = ::getenv( "HOME" );
70 char *hostname = ::getenv( "HOSTNAME" );
72 bool free_hostname = false;
74 // foreward declaration.
77 static bool fpeAbort = false;
78 static void initFPE();
80 #if defined(HAVE_FEENABLEEXCEPT)
81 static void handleFPE(int);
86 int except = fegetexcept();
87 feenableexcept(except | FE_DIVBYZERO | FE_INVALID);
89 signal(SIGFPE, handleFPE);
93 static void handleFPE(int)
95 feclearexcept(FE_ALL_EXCEPT);
96 signal(SIGFPE, handleFPE);
98 #elif defined(__linux__) && defined(__i386__)
100 static void handleFPE(int);
104 fpu_control_t fpe_flags = 0;
105 _FPU_GETCW(fpe_flags);
106 // fpe_flags &= ~_FPU_MASK_IM; // invalid operation
107 // fpe_flags &= ~_FPU_MASK_DM; // denormalized operand
108 // fpe_flags &= ~_FPU_MASK_ZM; // zero-divide
109 // fpe_flags &= ~_FPU_MASK_OM; // overflow
110 // fpe_flags &= ~_FPU_MASK_UM; // underflow
111 // fpe_flags &= ~_FPU_MASK_PM; // precision (inexact result)
112 _FPU_SETCW(fpe_flags);
113 signal(SIGFPE, handleFPE);
120 SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
123 static void initFPE()
129 int main ( int argc, char **argv );
130 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
131 LPSTR lpCmdLine, int nCmdShow) {
133 logbuf::has_no_console();
134 main( __argc, __argv );
140 #include <sys/sysmp.h>
144 * set the special "flush zero" bit (FS, bit 24) in the Control Status
145 * Register of the FPU of R4k and beyond so that the result of any
146 * underflowing operation will be clamped to zero, and no exception of
147 * any kind will be generated on the CPU. This has no effect on an
153 f.fc_word = get_fpc_csr();
154 f.fc_struct.flush = 1;
155 set_fpc_csr(f.fc_word);
159 static void fg_terminate() {
161 "Uncaught Exception: you should see a meaningful error message\n"
162 "here, but your GLUT (or SDL) library was apparently compiled\n"
163 "and/or linked without exception support. Please complain to\n"
169 int _bootstrap_OSInit;
171 // Main entry point; catch any exceptions that have made it this far.
172 int main ( int argc, char **argv ) {
174 // Don't show blocking "no disk in drive" error messages on Windows 7,
175 // silently return errors to application instead.
176 // See Microsoft MSDN #ms680621: "GUI apps should specify SEM_NOOPENFILEERRORBOX"
177 SetErrorMode(SEM_NOOPENFILEERRORBOX);
179 // Windows has no $HOME aka %HOME%, so we have to construct the full path.
180 // make sure it fits into the buffer. Max. path length is 255, but who knows
181 // what's in these environment variables?
182 homepath[sizeof(homepath)-1] = 0;
183 strncpy( homepath, ::getenv("APPDATA"), sizeof(homepath)-1 );
184 strncat( homepath, "\\flightgear.org", sizeof(homepath)-strlen(homepath)-1 );
187 #ifdef PTW32_STATIC_LIB
188 // Initialise static pthread win32 lib
189 pthread_win32_process_attach_np ();
191 _bootstrap_OSInit = 0;
193 #if defined(__FreeBSD__)
194 // Ignore floating-point exceptions on FreeBSD
195 signal(SIGFPE, SIG_IGN);
197 // Maybe Enable floating-point exceptions on Linux
198 for (int i = 0; i < argc; ++i) {
199 if (!strcmp("--enable-fpe", argv[i])) {
207 signal(SIGPIPE, SIG_IGN);
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 */
233 bool fgviewer = false;
234 for (int i = 0; i < argc; ++i) {
235 if (!strcmp("--fgviewer", argv[i])) {
241 // FIXME: add other, more specific
244 std::set_terminate(fg_terminate);
245 atexit(fgExitCleanup);
247 fgviewerMain(argc, argv);
249 fgMainInit(argc, argv);
252 } catch (const sg_throwable &t) {
253 // We must use cerr rather than
254 // logging, since logging may be
256 cerr << "Fatal error: " << t.getFormattedMessage() << endl;
257 if (std::strlen(t.getOrigin()) != 0)
258 cerr << " (received from " << t.getOrigin() << ')' << endl;
260 } catch (const string &s) {
261 cerr << "Fatal error: " << s << endl;
263 } catch (const char *s) {
264 cerr << "Fatal error: " << s << endl;
267 cerr << "Unknown exception in the main loop. Aborting..." << endl;
269 perror("Possible cause");
275 // do some clean up on exit. Specifically we want to call alutExit()
276 // which happens in the sound manager destructor.
277 void fgExitCleanup() {
279 if (_bootstrap_OSInit != 0)
280 fgSetMouseCursor(MOUSE_CURSOR_POINTER);
284 if (free_hostname && hostname != NULL)