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root/kernel/syscalls/settimeofday.c

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DEFINITIONS

This source file includes following definitions.
  1. sys_settimeofday

   1 /*
   2  * fiwix/kernel/syscalls/settimeofday.c
   3  *
   4  * Copyright 2018, Jordi Sanfeliu. All rights reserved.
   5  * Distributed under the terms of the Fiwix License.
   6  */
   7 
   8 #include <fiwix/kernel.h>
   9 #include <fiwix/fs.h>
  10 #include <fiwix/time.h>
  11 #include <fiwix/timer.h>
  12 #include <fiwix/process.h>
  13 #include <fiwix/errno.h>
  14 
  15 #ifdef __DEBUG__
  16 #include <fiwix/stdio.h>
  17 #endif /*__DEBUG__ */
  18 
  19 int sys_settimeofday(const struct timeval *tv, const struct timezone *tz)
  20 {
  21         int errno;
  22 
  23 #ifdef __DEBUG__
  24         printk("(pid %d) sys_settimeofday()\n", current->pid);
  25 #endif /*__DEBUG__ */
  26 
  27         if(!IS_SUPERUSER) {
  28                 return -EPERM;
  29         }
  30 
  31         if(tv) {
  32                 if((errno = check_user_area(VERIFY_READ, tv, sizeof(struct timeval)))) {
  33                         return errno;
  34                 }
  35                 CURRENT_TIME = tv->tv_sec;
  36                 set_system_time(CURRENT_TIME);
  37         }
  38         if(tz) {
  39                 if((errno = check_user_area(VERIFY_READ, tz, sizeof(struct timezone)))) {
  40                         return errno;
  41                 }
  42                 kstat.tz_minuteswest = tz->tz_minuteswest;
  43                 kstat.tz_dsttime = tz->tz_dsttime;
  44         }
  45         return 0;
  46 }

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