/* sys_linux_init:
* Top level system driver wakeup call.
*/
static int sys_linux_init (void)
{
/* Get OS type */
_unix_read_os_type();
if (os_type != OSTYPE_LINUX) return -1; /* FWIW */
/* This is the only bit that needs root privileges. First
* we attempt to set our euid to 0, in case this is the
* second time we've been called. */
__al_linux_have_ioperms = !seteuid (0);
#ifdef ALLEGRO_LINUX_VGA
__al_linux_have_ioperms &= !iopl (3);
#endif
__al_linux_have_ioperms &= !__al_linux_init_memory();
/* At this stage we can drop the root privileges. */
seteuid (getuid());
/* Initialise dynamic driver lists */
_unix_driver_lists_init();
if (_unix_gfx_driver_list)
_driver_list_append_list(&_unix_gfx_driver_list, _linux_gfx_driver_list);
/* Load dynamic modules */
_unix_load_modules(SYSTEM_LINUX);
/* Initialise VGA helpers */
#ifdef ALLEGRO_LINUX_VGA
if (__al_linux_have_ioperms)
if (__al_linux_init_vga_helpers()) return -1;
#endif
/* Install emergency-exit signal handlers */
old_sig_abrt = signal(SIGABRT, signal_handler);
old_sig_fpe = signal(SIGFPE, signal_handler);
old_sig_ill = signal(SIGILL, signal_handler);
old_sig_segv = signal(SIGSEGV, signal_handler);
old_sig_term = signal(SIGTERM, signal_handler);
old_sig_int = signal(SIGINT, signal_handler);
#ifdef SIGQUIT
old_sig_quit = signal(SIGQUIT, signal_handler);
#endif
/* Initialise async event processing */
if (__al_linux_bgman_init()) {
/* shutdown everything. */
sys_linux_exit();
return -1;
}
/* Mark the beginning of time */
_al_unix_init_time();
return 0;
}
/* _xwin_sysdrv_init:
* Top level system driver wakeup call.
*/
static int _xwin_sysdrv_init(void)
{
char tmp[256];
_unix_read_os_type();
/* install emergency-exit signal handlers */
old_sig_abrt = signal(SIGABRT, _xwin_signal_handler);
old_sig_fpe = signal(SIGFPE, _xwin_signal_handler);
old_sig_ill = signal(SIGILL, _xwin_signal_handler);
old_sig_segv = signal(SIGSEGV, _xwin_signal_handler);
old_sig_term = signal(SIGTERM, _xwin_signal_handler);
old_sig_int = signal(SIGINT, _xwin_signal_handler);
#ifdef SIGQUIT
old_sig_quit = signal(SIGQUIT, _xwin_signal_handler);
#endif
/* Initialise dynamic driver lists and load modules */
_unix_driver_lists_init();
if (_unix_gfx_driver_list)
_driver_list_append_list(&_unix_gfx_driver_list, _xwin_gfx_driver_list);
_unix_load_modules(SYSTEM_XWINDOWS);
#ifdef ALLEGRO_HAVE_LIBPTHREAD
_unix_bg_man = &_bg_man_pthreads;
#else
_unix_bg_man = &_bg_man_sigalrm;
#endif
/* Initialise bg_man */
if (_unix_bg_man->init()) {
_xwin_sysdrv_exit();
return -1;
}
#ifdef ALLEGRO_MULTITHREADED
if (_unix_bg_man->multi_threaded) {
_xwin.mutex = _unix_create_mutex();
}
#endif
get_executable_name(tmp, sizeof(tmp));
set_window_title(get_filename(tmp));
if (get_config_int("system", "XInitThreads", 1))
XInitThreads();
/* Open the display, create a window, and background-process
* events for it all. */
if (_xwin_open_display(0) || _xwin_create_window()
|| _unix_bg_man->register_func(_xwin_bg_handler))
{
_xwin_sysdrv_exit();
return -1;
}
set_display_switch_mode(SWITCH_BACKGROUND);
return 0;
}
