1/* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2004, 2007 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 3 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, see <http://www.gnu.org/licenses/>. 17 18*/ 19 20#include <stdio.h> 21#include <string.h> 22#include <signal.h> 23#include <sys/time.h> 24 25static volatile int done; 26 27static void 28handler (int sig) 29{ 30 done = 1; 31} /* handler */ 32 33struct itimerval itime; 34struct sigaction action; 35 36/* The enum is so that GDB can easily see these macro values. */ 37enum { 38 itimer_real = ITIMER_REAL, 39 itimer_virtual = ITIMER_VIRTUAL 40} itimer = ITIMER_VIRTUAL; 41 42main () 43{ 44 45 /* Set up the signal handler. */ 46 memset (&action, 0, sizeof (action)); 47 action.sa_handler = handler; 48 sigaction (SIGVTALRM, &action, NULL); 49 sigaction (SIGALRM, &action, NULL); 50 51 /* The values needed for the itimer. This needs to be at least long 52 enough for the setitimer() call to return. */ 53 memset (&itime, 0, sizeof (itime)); 54 itime.it_value.tv_usec = 250 * 1000; 55 56 /* Loop for ever, constantly taking an interrupt. */ 57 while (1) 58 { 59 /* Set up a one-off timer. A timer, rather than SIGSEGV, is 60 used as after a timer handler finishes the interrupted code 61 can safely resume. */ 62 setitimer (itimer, &itime, NULL); 63 /* Wait. */ 64 while (!done); 65 done = 0; 66 } 67} 68