131 lines
4.8 KiB
C
131 lines
4.8 KiB
C
/* The system call implemented in this file:
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* m_type: CLK_SIGNALRM, CLK_SYNCALRM, CLK_FLAGALRM
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*
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* The parameters for this system call are:
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* m2_i1: ALRM_PROC_NR (set alarm for this process)
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* m2_l1: ALRM_EXP_TIME (alarm's expiration time)
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* m2_i2: ALRM_ABS_TIME (expiration time is absolute?)
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* m2_l1: ALRM_SEC_LEFT (return seconds left of previous)
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* m2_p1: ALRM_FLAG_PTR (virtual addr of alarm flag)
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*
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* Changes:
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* Aug 25, 2004 fully rewritten to unite all alarms (Jorrit N. Herder)
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* May 02, 2004 added new timeout flag alarm (Jorrit N. Herder)
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*/
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#include "../kernel.h"
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#include "../system.h"
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#include <signal.h>
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FORWARD _PROTOTYPE( void cause_syncalrm, (timer_t *tp) );
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FORWARD _PROTOTYPE( void cause_flagalrm, (timer_t *tp) );
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FORWARD _PROTOTYPE( void cause_signalrm, (timer_t *tp) );
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/*===========================================================================*
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* do_setalarm *
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*===========================================================================*/
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PUBLIC int do_setalarm(m_ptr)
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message *m_ptr; /* pointer to request message */
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{
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/* A process requests an alarm, or wants to cancel its alarm. This function
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* is shared used for all of SYS_SIGNALRM, SYS_SYNCALRM, and SYS_FLAGALRM.
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*/
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int proc_nr; /* which process wants the alarm */
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long exp_time; /* expiration time for this alarm */
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int use_abs_time; /* use absolute or relative time */
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timer_t *tp; /* the process' timer structure */
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clock_t uptime; /* placeholder for current uptime */
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/* Extract shared parameters from the request message. */
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proc_nr = m_ptr->ALRM_PROC_NR; /* process to interrupt later */
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if (SELF == proc_nr) proc_nr = m_ptr->m_source;
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if (! isokprocn(proc_nr)) return(EINVAL);
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exp_time = m_ptr->ALRM_EXP_TIME; /* alarm's expiration time */
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use_abs_time = m_ptr->ALRM_ABS_TIME; /* flag for absolute time */
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/* Get the timer structure and set the parameters for this alarm. */
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switch (m_ptr->m_type) {
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case SYS_SYNCALRM: /* notify with SYN_ALARM message */
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tp = &(proc_addr(proc_nr)->p_syncalrm);
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tmr_arg(tp)->ta_int = proc_nr;
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tp->tmr_func = cause_syncalrm;
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break;
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case SYS_SIGNALRM: /* send process a SIGALRM signal */
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tp = &(proc_addr(proc_nr)->p_signalrm);
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tmr_arg(tp)->ta_int = proc_nr;
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tp->tmr_func = cause_signalrm;
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break;
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case SYS_FLAGALRM: /* set caller's timeout flag to 1 */
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tp = &(proc_addr(proc_nr)->p_flagalrm);
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tmr_arg(tp)->ta_long =
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numap_local(proc_nr,(vir_bytes) m_ptr->ALRM_FLAG_PTR,sizeof(int));
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if (! tmr_arg(tp)->ta_long) return(EFAULT);
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tp->tmr_func = cause_flagalrm;
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break;
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default: /* invalid alarm type */
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return(EINVAL);
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}
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/* Return the ticks left on the previous alarm. */
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uptime = get_uptime();
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if ((tp->tmr_exp_time == TMR_NEVER) || (tp->tmr_exp_time < uptime) ) {
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m_ptr->ALRM_TIME_LEFT = 0;
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} else {
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m_ptr->ALRM_TIME_LEFT = (tp->tmr_exp_time - uptime);
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}
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/* Finally, (re)set the timer depending on 'exp_time'. */
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if (exp_time == 0) {
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reset_timer(tp);
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} else {
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tp->tmr_exp_time = (use_abs_time) ? exp_time : exp_time + get_uptime();
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set_timer(tp, tp->tmr_exp_time, tp->tmr_func);
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}
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return(OK);
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}
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/*===========================================================================*
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* cause_signalrm *
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*===========================================================================*/
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PRIVATE void cause_signalrm(tp)
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timer_t *tp;
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{
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/* Routine called if a timer goes off for a process that requested an SIGALRM
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* signal using the alarm(2) system call. The timer argument 'ta_int' contains
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* the process number of the process to signal.
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*/
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cause_sig(tmr_arg(tp)->ta_int, SIGALRM);
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}
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/*===========================================================================*
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* cause_flagalrm *
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*===========================================================================*/
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PRIVATE void cause_flagalrm(tp)
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timer_t *tp;
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{
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/* Routine called if a timer goes off for a process that requested a timeout
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* flag to be set when the alarm expires. The timer argument 'ta_long' gives
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* the physical address of the timeout flag. No validity check was done when
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* setting the alarm, so check for 0 here.
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*/
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int timeout = 1;
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phys_bytes timeout_flag = (phys_bytes) tmr_arg(tp)->ta_long;
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phys_copy(vir2phys(&timeout), tmr_arg(tp)->ta_long, sizeof(int));
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}
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/*===========================================================================*
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* cause_syncalrm *
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*===========================================================================*/
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PRIVATE void cause_syncalrm(tp)
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timer_t *tp;
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{
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/* Routine called if a timer goes off and the process requested a synchronous
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* alarm. The process number is stored in timer argument 'ta_int'. Notify that
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* process given with a SYN_ALARM message.
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*/
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notify(tmr_arg(tp)->ta_int, SYN_ALARM);
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}
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