minix/lib/libsys/sys_setalarm.c

   1 #include "syslib.h"
   2
   3 /*
   4  * Ask the kernel to schedule a synchronous alarm for the caller, using either
   5  * an absolute or a relative number of clock ticks.  The new alarm replaces any
   6  * previously set alarm.  If a relative expiry time of zero is given, the
   7  * current alarm is stopped.  Return OK or a negative error code.  On success,
   8  * optionally return the time left on the previous timer (TMR_NEVER if none was
   9  * set) and the current time.
  10  */
  11 int
  12 sys_setalarm2(clock_t exp_time, int abs_time, clock_t * time_left,
  13         clock_t * uptime)
  14 {
  15         message m;
  16         int r;
  17
  18         m.m_lsys_krn_sys_setalarm.exp_time = exp_time; /* expiration time */
  19         m.m_lsys_krn_sys_setalarm.abs_time = abs_time; /* time is absolute? */
  20
  21         if ((r = _kernel_call(SYS_SETALARM, &m)) != OK)
  22                 return r;
  23
  24         if (time_left != NULL)
  25                 *time_left = m.m_lsys_krn_sys_setalarm.time_left;
  26         if (uptime != NULL)
  27                 *uptime = m.m_lsys_krn_sys_setalarm.uptime;
  28         return OK;
  29 }