1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2004 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 2 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, write to the Free Software 17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 18 19 */ 20 21 #include <stdio.h> 22 #include <string.h> 23 #include <signal.h> 24 #include <sys/time.h> 25 26 static volatile int done; 27 28 static void 29 handler (int sig) 30 { 31 done = 1; 32 } /* handler */ 33 34 struct itimerval itime; 35 struct sigaction action; 36 37 /* The enum is so that GDB can easily see these macro values. */ 38 enum { 39 itimer_real = ITIMER_REAL, 40 itimer_virtual = ITIMER_VIRTUAL 41 } itimer = ITIMER_VIRTUAL; 42 43 main () 44 { 45 46 /* Set up the signal handler. */ 47 memset (&action, 0, sizeof (action)); 48 action.sa_handler = handler; 49 sigaction (SIGVTALRM, &action, NULL); 50 sigaction (SIGALRM, &action, NULL); 51 52 /* The values needed for the itimer. This needs to be at least long 53 enough for the setitimer() call to return. */ 54 memset (&itime, 0, sizeof (itime)); 55 itime.it_value.tv_usec = 250 * 1000; 56 57 /* Loop for ever, constantly taking an interrupt. */ 58 while (1) 59 { 60 /* Set up a one-off timer. A timer, rather than SIGSEGV, is 61 used as after a timer handler finishes the interrupted code 62 can safely resume. */ 63 setitimer (itimer, &itime, NULL); 64 /* Wait. */ 65 while (!done); 66 done = 0; 67 } 68 } 69