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259 lines
4.7 KiB
C
259 lines
4.7 KiB
C
/*
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*
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* ===================================
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* HARP | Host ATM Research Platform
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* ===================================
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*
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*
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* This Host ATM Research Platform ("HARP") file (the "Software") is
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* made available by Network Computing Services, Inc. ("NetworkCS")
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* "AS IS". NetworkCS does not provide maintenance, improvements or
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* support of any kind.
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*
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* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
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* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
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* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
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* In no event shall NetworkCS be responsible for any damages, including
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* but not limited to consequential damages, arising from or relating to
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* any use of the Software or related support.
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*
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* Copyright 1994-1998 Network Computing Services, Inc.
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*
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* Copies of this Software may be made, however, the above copyright
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* notice must be reproduced on all copies.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* User Space Library Functions
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* ----------------------------
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*
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* Timer functions
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*
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netatm/port.h>
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#include <netatm/queue.h>
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#include <netatm/atm.h>
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#include <netatm/atm_if.h>
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#include <netatm/atm_sap.h>
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#include <netatm/atm_sys.h>
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#include <netatm/atm_ioctl.h>
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#include <errno.h>
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#include <signal.h>
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#include "libatm.h"
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Harp_timer *harp_timer_head;
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int harp_timer_exec;
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/*
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* Process a HARP timer tick
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*
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* This function is called via the SIGALRM signal. It increments
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* harp_timer_exec. The user should check this flag frequently and
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* call timer_proc when it is set.
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*
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* Arguments:
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* None
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*
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* Returns:
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* None
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*
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*/
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static void
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timer_tick(void)
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{
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/*
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* Bump the timer flag
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*/
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harp_timer_exec++;
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}
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/*
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* Process HARP timers
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*
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* This function is called after a SIGALRM signal is posted. It runs
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* down the list of timer entries, calling the specified functions
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* for any timers that have expired.
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*
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* Arguments:
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* None
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*
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* Returns:
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* None
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*
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*/
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void
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timer_proc(void)
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{
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Harp_timer *htp;
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void (*f)(Harp_timer *);
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/*
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* Reset marks in all timers on the queue
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*/
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for (htp = harp_timer_head; htp; htp = htp->ht_next) {
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htp->ht_mark = -1;
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}
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/*
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* Run through timer chain decrementing each timer.
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* If an expired timer is found, take the timer block
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* off the chain and call the specified function. A
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* timer's action can result in other timers being
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* cancelled (taken off the queue), so every time we
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* call a user function, we start over from the top of
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* the list.
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*/
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timer_cont:
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for (htp = harp_timer_head; htp; htp = htp->ht_next) {
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/*
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* Make sure we only process each entry once and
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* don't process entries that are put on the queue
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* by user functions we call for this tick
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*/
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if (htp->ht_mark == -1) {
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/*
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* Decrement the timer and mark that we've
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* processed the entry
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*/
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htp->ht_ticks -= harp_timer_exec;
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htp->ht_mark = 1;
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/*
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* Check whether the timer is expired
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*/
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if (htp->ht_ticks <= 0) {
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/*
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* Unlink the timer block and call
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* the user function
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*/
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f = htp->ht_func;
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UNLINK(htp, Harp_timer, harp_timer_head,
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ht_next);
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f(htp);
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/*
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* Start over
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*/
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goto timer_cont;
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}
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}
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}
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/*
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* Reset the timer exec flag
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*/
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harp_timer_exec = 0;
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}
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/*
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* Start the timer
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*
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* Set up the SIGALRM signal handler and set up the real-time
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* timer to tick once per second.
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*
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* Arguments:
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* None
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*
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* Returns:
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* 0 success
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* errno reason for failure
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*
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*/
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int
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init_timer()
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{
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int rc = 0;
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struct itimerval timeval;
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/*
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* Clear the timer flag
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*/
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harp_timer_exec = 0;
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/*
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* Set up signal handler
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*/
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if (signal(SIGALRM, (sig_t)timer_tick) == SIG_ERR) {
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return(errno);
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}
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/*
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* Start timer
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*/
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timeval.it_value.tv_sec = 1;
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timeval.it_value.tv_usec = 0;
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timeval.it_interval.tv_sec = 1;
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timeval.it_interval.tv_usec = 0;
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if (setitimer(ITIMER_REAL, &timeval,
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(struct itimerval *)0) == -1) {
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rc = errno;
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(void)signal(SIGALRM, SIG_DFL);
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}
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return(rc);
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}
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/*
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* Block timers from firing
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*
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* Block the SIGALRM signal.
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*
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* Arguments:
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* None
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*
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* Returns:
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* mask the previous blocked signal mask
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*
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*/
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int
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block_timer()
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{
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/*
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* Block the SIGALRM signal
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*/
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return(sigblock(sigmask(SIGALRM)));
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}
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/*
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* Re-enable timers
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*
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* Restore the signal mask (presumably one that was returned by
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* block_timer).
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*
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* Arguments:
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* mask the signal mask to be restored
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*
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* Returns:
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* mask the previous blocked signal mask
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*
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*/
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void
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enable_timer(mask)
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int mask;
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{
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/*
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* Set the signal mask
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*/
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sigsetmask(mask);
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return;
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}
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