/* This testcase is part of GDB, the GNU debugger. Copyright 2004 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <stdio.h> #include <string.h> #include <signal.h> #include <sys/time.h> static volatile int done; static void handler (int sig) { done = 1; } /* handler */ struct itimerval itime; struct sigaction action; /* The enum is so that GDB can easily see these macro values. */ enum { itimer_real = ITIMER_REAL, itimer_virtual = ITIMER_VIRTUAL } itimer = ITIMER_VIRTUAL; main () { /* Set up the signal handler. */ memset (&action, 0, sizeof (action)); action.sa_handler = handler; sigaction (SIGVTALRM, &action, NULL); sigaction (SIGALRM, &action, NULL); /* The values needed for the itimer. This needs to be at least long enough for the setitimer() call to return. */ memset (&itime, 0, sizeof (itime)); itime.it_value.tv_usec = 250 * 1000; /* Loop for ever, constantly taking an interrupt. */ while (1) { /* Set up a one-off timer. A timer, rather than SIGSEGV, is used as after a timer handler finishes the interrupted code can safely resume. */ setitimer (itimer, &itime, NULL); /* Wait. */ while (!done); done = 0; } }