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>
52 #include <simgear/debug/logstream.hxx>
53 #include <simgear/math/SGMath.hxx>
61 #include "globals.hxx"
62 #include "fg_props.hxx"
63 #include "fgviewer.hxx"
69 char *hostname = NULL;
70 bool free_hostname = false;
72 // foreward declaration.
75 static bool fpeAbort = false;
76 static void initFPE();
78 #if defined(HAVE_FEENABLEEXCEPT)
79 static void handleFPE(int);
84 int except = fegetexcept();
85 feenableexcept(except | FE_DIVBYZERO | FE_INVALID);
87 signal(SIGFPE, handleFPE);
91 static void handleFPE(int)
93 feclearexcept(FE_ALL_EXCEPT);
94 signal(SIGFPE, handleFPE);
96 #elif defined(__linux__) && defined(__i386__)
98 static void handleFPE(int);
102 fpu_control_t fpe_flags = 0;
103 _FPU_GETCW(fpe_flags);
104 // fpe_flags &= ~_FPU_MASK_IM; // invalid operation
105 // fpe_flags &= ~_FPU_MASK_DM; // denormalized operand
106 // fpe_flags &= ~_FPU_MASK_ZM; // zero-divide
107 // fpe_flags &= ~_FPU_MASK_OM; // overflow
108 // fpe_flags &= ~_FPU_MASK_UM; // underflow
109 // fpe_flags &= ~_FPU_MASK_PM; // precision (inexact result)
110 _FPU_SETCW(fpe_flags);
111 signal(SIGFPE, handleFPE);
118 SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
121 static void initFPE()
127 int main ( int argc, char **argv );
128 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
129 LPSTR lpCmdLine, int nCmdShow) {
131 logbuf::has_no_console();
132 main( __argc, __argv );
138 #include <sys/sysmp.h>
142 * set the special "flush zero" bit (FS, bit 24) in the Control Status
143 * Register of the FPU of R4k and beyond so that the result of any
144 * underflowing operation will be clamped to zero, and no exception of
145 * any kind will be generated on the CPU. This has no effect on an
151 f.fc_word = get_fpc_csr();
152 f.fc_struct.flush = 1;
153 set_fpc_csr(f.fc_word);
157 static void fg_terminate() {
159 "Uncaught Exception: you should see a meaningful error message\n"
160 "here, but your GLUT (or SDL) library was apparently compiled\n"
161 "and/or linked without exception support. Please complain to\n"
167 int _bootstrap_OSInit;
169 // Main entry point; catch any exceptions that have made it this far.
170 int main ( int argc, char **argv ) {
172 // Don't show blocking "no disk in drive" error messages on Windows 7,
173 // silently return errors to application instead.
174 // See Microsoft MSDN #ms680621: "GUI apps should specify SEM_NOOPENFILEERRORBOX"
175 SetErrorMode(SEM_NOOPENFILEERRORBOX);
177 // Windows has no $HOME aka %HOME%, so we have to construct the full path.
178 // make sure it fits into the buffer. Max. path length is 255, but who knows
179 // what's in these environment variables?
180 char homepath[256] = "";
181 homepath[sizeof(homepath)-1] = 0;
182 strncpy( homepath, ::getenv("APPDATA"), sizeof(homepath)-1 );
183 strncat( homepath, "\\flightgear.org", sizeof(homepath)-strlen(homepath)-1 );
185 homedir = strdup(homepath);
186 hostname = ::getenv( "COMPUTERNAME" );
188 // Unix(alike) systems
190 gethostname(_hostname, 256);
191 hostname = strdup(_hostname);
192 free_hostname = true;
194 homedir = ::getenv( "HOME" );
196 signal(SIGPIPE, SIG_IGN);
199 #ifdef PTW32_STATIC_LIB
200 // Initialise static pthread win32 lib
201 pthread_win32_process_attach_np ();
203 _bootstrap_OSInit = 0;
205 #if defined(__FreeBSD__)
206 // Ignore floating-point exceptions on FreeBSD
207 signal(SIGFPE, SIG_IGN);
209 // Maybe Enable floating-point exceptions on Linux
210 for (int i = 0; i < argc; ++i) {
211 if (!strcmp("--enable-fpe", argv[i])) {
222 // Bind all non-rendering threads to CPU1
223 // This will reduce the jitter caused by them to an absolute minimum,
224 // but it will only work with superuser authority.
225 if ( geteuid() == 0 )
227 sysmp(MP_CLOCK, 0); // bind the timer only to CPU0
228 sysmp(MP_ISOLATE, 1 ); // Isolate CPU1
229 sysmp(MP_NONPREEMPTIVE, 1 ); // disable process time slicing on CPU1
233 // Enable floating-point exceptions for Windows
234 #if defined( _MSC_VER ) && defined( DEBUG )
235 // Christian, we should document what this does
236 _control87( _EM_INEXACT, _MCW_EM );
239 #if defined( HAVE_BC5PLUS )
240 _control87(MCW_EM, MCW_EM); /* defined in float.h */
243 bool fgviewer = false;
244 for (int i = 0; i < argc; ++i) {
245 if (!strcmp("--fgviewer", argv[i])) {
251 // FIXME: add other, more specific
254 std::set_terminate(fg_terminate);
255 atexit(fgExitCleanup);
257 fgviewerMain(argc, argv);
259 fgMainInit(argc, argv);
262 } catch (const sg_throwable &t) {
263 // We must use cerr rather than
264 // logging, since logging may be
266 cerr << "Fatal error: " << t.getFormattedMessage() << endl;
267 if (std::strlen(t.getOrigin()) != 0)
268 cerr << " (received from " << t.getOrigin() << ')' << endl;
270 } catch (const string &s) {
271 cerr << "Fatal error: " << s << endl;
273 } catch (const char *s) {
274 cerr << "Fatal error: " << s << endl;
277 cerr << "Unknown exception in the main loop. Aborting..." << endl;
279 perror("Possible cause");
285 // do some clean up on exit. Specifically we want to call alutExit()
286 // which happens in the sound manager destructor.
287 void fgExitCleanup() {
289 if (_bootstrap_OSInit != 0)
290 fgSetMouseCursor(MOUSE_CURSOR_POINTER);
294 if (free_hostname && hostname != NULL)