minix/servers/pm/time.c
David van Moolenbroek 24ec0d73b5 Clean up interface to PM and VFS
- introduce new call numbers, names, and field aliases;
- initialize request messages to zero for all ABI calls;
- format callnr.h in the same way as com.h;
- redo call tables in both servers;
- remove param.h namespace pollution in the servers;
- make brk(2) go to VM directly, rather than through PM;
- remove obsolete BRK, UTIME, and WAIT calls;
- clean up path copying routine in VFS;
- move remaining system calls from libminlib to libc;
- correct some errno-related mistakes in libc routines.

Change-Id: I2d8ec5d061cd7e0b30c51ffd77aa72ebf84e2565
2014-03-01 09:05:01 +01:00

134 lines
3.8 KiB
C

/* This file takes care of those system calls that deal with time.
*
* The entry points into this file are
* do_getres: perform the CLOCK_GETRES system call
* do_gettime: perform the CLOCK_GETTIME system call
* do_settime: perform the CLOCK_SETTIME system call
* do_time: perform the GETTIMEOFDAY system call
* do_stime: perform the STIME system call
*/
#include "pm.h"
#include <minix/callnr.h>
#include <minix/com.h>
#include <signal.h>
#include <sys/time.h>
#include "mproc.h"
/*===========================================================================*
* do_gettime *
*===========================================================================*/
int do_gettime()
{
clock_t ticks, realtime, clock;
time_t boottime;
int s;
if ( (s=getuptime(&ticks, &realtime, &boottime)) != OK)
panic("do_time couldn't get uptime: %d", s);
switch (m_in.PM_TIME_CLK_ID) {
case CLOCK_REALTIME:
clock = realtime;
break;
case CLOCK_MONOTONIC:
clock = ticks;
break;
default:
return EINVAL; /* invalid/unsupported clock_id */
}
mp->mp_reply.PM_TIME_SEC = (time_t) (boottime + (clock / system_hz));
mp->mp_reply.PM_TIME_NSEC =
(long) ((clock % system_hz) * 1000000000ULL / system_hz);
return(OK);
}
/*===========================================================================*
* do_getres *
*===========================================================================*/
int do_getres()
{
switch (m_in.PM_TIME_CLK_ID) {
case CLOCK_REALTIME:
case CLOCK_MONOTONIC:
/* tv_sec is always 0 since system_hz is an int */
mp->mp_reply.PM_TIME_SEC = (time_t) 0;
mp->mp_reply.PM_TIME_NSEC = 1000000000 / system_hz;
return(OK);
default:
return EINVAL; /* invalid/unsupported clock_id */
}
}
/*===========================================================================*
* do_settime *
*===========================================================================*/
int do_settime()
{
int s;
if (mp->mp_effuid != SUPER_USER) {
return(EPERM);
}
switch (m_in.PM_TIME_CLK_ID) {
case CLOCK_REALTIME:
s= sys_settime(m_in.PM_TIME_NOW, m_in.PM_TIME_CLK_ID,
m_in.PM_TIME_SEC, m_in.PM_TIME_NSEC);
return(s);
case CLOCK_MONOTONIC: /* monotonic cannot be changed */
default:
return EINVAL; /* invalid/unsupported clock_id */
}
}
/*===========================================================================*
* do_time *
*===========================================================================*/
int do_time()
{
/* Perform the time(tp) system call. This returns the time in seconds since
* 1.1.1970. MINIX is an astrophysically naive system that assumes the earth
* rotates at a constant rate and that such things as leap seconds do not
* exist.
*/
clock_t ticks, realtime;
time_t boottime;
int s;
if ( (s=getuptime(&ticks, &realtime, &boottime)) != OK)
panic("do_time couldn't get uptime: %d", s);
mp->mp_reply.PM_TIME_SEC = (time_t) (boottime + (realtime / system_hz));
mp->mp_reply.PM_TIME_USEC =
(long) ((realtime % system_hz) * 1000000ULL / system_hz);
return(OK);
}
/*===========================================================================*
* do_stime *
*===========================================================================*/
int do_stime()
{
/* Perform the stime(tp) system call. Retrieve the system's uptime (ticks
* since boot) and pass the new time in seconds at system boot to the kernel.
*/
clock_t uptime, realtime;
time_t boottime;
int s;
if (mp->mp_effuid != SUPER_USER) {
return(EPERM);
}
if ( (s=getuptime(&uptime, &realtime, &boottime)) != OK)
panic("do_stime couldn't get uptime: %d", s);
boottime = (long) m_in.PM_TIME_SEC - (realtime/system_hz);
s= sys_stime(boottime); /* Tell kernel about boottime */
if (s != OK)
panic("pm: sys_stime failed: %d", s);
return(OK);
}