198c976f7e
that passes signal map along. This mechanisms is also used for nonuser signals like SIGKMESS, SIGKSTOP, SIGKSIG. Revised comments of many system call handlers. Renamed setpriority to nice.
78 lines
2.7 KiB
C
78 lines
2.7 KiB
C
/* The system call implemented in this file:
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* m_type: SYS_SETALARM
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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_TIME_LEFT (return seconds left of previous)
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*
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* Changes:
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* Aug 25, 2004 fully rewritten to clean up code (Jorrit N. Herder)
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*/
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#include "../system.h"
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#if USE_SETALARM
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FORWARD _PROTOTYPE( void cause_alarm, (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 a synchronous alarm, or wants to cancel its alarm. */
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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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tp = &(proc_addr(proc_nr)->p_priv->s_alarm_timer);
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tmr_arg(tp)->ta_int = proc_nr;
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tp->tmr_func = cause_alarm;
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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_alarm *
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*===========================================================================*/
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PRIVATE void cause_alarm(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 with a notification message from CLOCK.
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*/
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lock_alert(CLOCK, tmr_arg(tp)->ta_int);
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}
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#endif /* USE_SETALARM */
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