1/* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2004, 2007, 2008, 2009, 2010, 2011 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#include <errno.h> 25 26static volatile int done; 27 28static void 29handler (int sig) 30{ 31 done = 1; 32} /* handler */ 33 34struct itimerval itime; 35struct sigaction action; 36 37/* The enum is so that GDB can easily see these macro values. */ 38enum { 39 itimer_real = ITIMER_REAL, 40 itimer_virtual = ITIMER_VIRTUAL 41} itimer = ITIMER_VIRTUAL; 42 43int 44main () 45{ 46 47 int res; 48 /* Set up the signal handler. */ 49 memset (&action, 0, sizeof (action)); 50 action.sa_handler = handler; 51 sigaction (SIGVTALRM, &action, NULL); 52 sigaction (SIGALRM, &action, NULL); 53 54 /* The values needed for the itimer. This needs to be at least long 55 enough for the setitimer() call to return. */ 56 memset (&itime, 0, sizeof (itime)); 57 itime.it_value.tv_usec = 250 * 1000; 58 59 /* Loop for ever, constantly taking an interrupt. */ 60 while (1) 61 { 62 /* Set up a one-off timer. A timer, rather than SIGSEGV, is 63 used as after a timer handler finishes the interrupted code 64 can safely resume. */ 65 res = setitimer (itimer, &itime, NULL); 66 if (res == -1) 67 { 68 printf ("First call to setitimer failed, errno = %d\r\n",errno); 69 itimer = ITIMER_REAL; 70 res = setitimer (itimer, &itime, NULL); 71 if (res == -1) 72 { 73 printf ("Second call to setitimer failed, errno = %d\r\n",errno); 74 return 1; 75 } 76 } 77 /* Wait. */ 78 while (!done); 79 done = 0; 80 } 81 return 0; 82} 83