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root/kernel/syscalls/getitimer.c

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DEFINITIONS

This source file includes following definitions.
  1. sys_getitimer

   1 /*
   2  * fiwix/kernel/syscalls/getitimer.c
   3  *
   4  * Copyright 2018, Jordi Sanfeliu. All rights reserved.
   5  * Distributed under the terms of the Fiwix License.
   6  */
   7 
   8 #include <fiwix/fs.h>
   9 #include <fiwix/time.h>
  10 #include <fiwix/process.h>
  11 #include <fiwix/errno.h>
  12 
  13 #ifdef __DEBUG__
  14 #include <fiwix/stdio.h>
  15 #endif /*__DEBUG__ */
  16 
  17 int sys_getitimer(int which, struct itimerval *curr_value)
  18 {
  19         int errno;
  20 
  21 #ifdef __DEBUG__
  22         printk("(pid %d) sys_getitimer(%d, 0x%08x) -> \n", current->pid, which, (unsigned int)curr_value);
  23 #endif /*__DEBUG__ */
  24 
  25         if((unsigned int)curr_value) {
  26                 if((errno = check_user_area(VERIFY_WRITE, curr_value, sizeof(struct itimerval)))) {
  27                         return errno;
  28                 }
  29         }
  30 
  31         switch(which) {
  32                 case ITIMER_REAL:
  33                         ticks2tv(current->it_real_interval, &curr_value->it_interval);
  34                         ticks2tv(current->it_real_value, &curr_value->it_value);
  35                         break;
  36                 case ITIMER_VIRTUAL:
  37                         ticks2tv(current->it_virt_interval, &curr_value->it_interval);
  38                         ticks2tv(current->it_virt_value, &curr_value->it_value);
  39                         break;
  40                 case ITIMER_PROF:
  41                         ticks2tv(current->it_prof_interval, &curr_value->it_interval);
  42                         ticks2tv(current->it_prof_value, &curr_value->it_value);
  43                         break;
  44                 default:
  45                         return -EINVAL;
  46         }
  47         return 0;
  48 }

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