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[gapil.git] / sources / Sleep.c

diff --git a/sources/Sleep.c b/sources/Sleep.c
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-/* Sleep.c
- * 
- * Copyright (C) 2002 Simone Piccardi
- * 
- * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-/****************************************************************
- *
- * Program Sleep.c: 
- * Example implementation for sleep
- *
- * Author: Simone Piccardi
- * Apr. 2002
- *
- ****************************************************************/
-/* 
- * Include needed headers
- */
-#include <unistd.h>      /* unix standard library */
-#include <signal.h>      /* POSIX signal library */
-
-void alarm_hand(int);
-
-unsigned int sleep(unsigned int seconds)
-{
-/* 
- * Variables definition  
- */
-    struct sigaction new_action, old_action;
-    sigset_t old_mask, stop_mask, sleep_mask;
-    /* set the signal handler */
-    sigemptyset(&new_action.sa_mask);              /* no signal blocked */
-    new_action.sa_handler = alarm_hand;            /* set handler */
-    new_action.sa_flags = 0;                       /* no flags */
-    sigaction(SIGALRM, &new_action, &old_action);  /* install action */
-    /* block SIGALRM to avoid race conditions */
-    sigemptyset(&stop_mask);                       /* init mask to empty */
-    sigaddset(&stop_mask, SIGALRM);                /* add SIGALRM */
-    sigprocmask(SIG_BLOCK, &stop_mask, &old_mask); /* add SIGALRM to blocked */
-    /* send the alarm */
-    alarm(seconds); 
-    /* going to sleep enabling SIGALRM */
-    sleep_mask = old_mask;                         /* take mask */
-    sigdelset(&sleep_mask, SIGALRM);               /* remove SIGALRM */
-    sigsuspend(&sleep_mask);                       /* go to sleep */
-    /* restore previous settings */
-    sigprocmask(SIG_SETMASK, &old_mask, NULL);     /* reset signal mask */    
-    sigaction(SIGALRM, &old_action, NULL);         /* reset signal action */
-    /* return remaining time */
-    return alarm(0);
-}
-/*
- * Signal Handler for SIGALRM
- */
-void alarm_hand(int sig) {
-    /* just return to interrupt sigsuspend */
-    return;
-}