i am sure that no other application is trying to write at the same time.

________________________________________
From: Colin Burgess [community-noreply@qnx.com]
Sent: Wednesday, August 19, 2009 10:31 PM
To: momentics-community
Subject: Re: problem with clock_settime() function on QNX 6.4.0

Are you sure that no other app is messing with the time - because reading the clock has no affect on the system time.

soujanya Yelchuri wrote:
> if i call system("date");
> after some time around 5 mins at the end of my statup
> its unable to show the time what i set..
> what i mean to say is the clock_settime() function is unable to set the date and time.
> if iam accessing the date immediately after setting date then its able to update the new time else no
> thats my oservation..may be wrong..
>
>
> ________________________________________
> From: Colin Burgess [community-noreply@qnx.com]
> Sent: Wednesday, August 19, 2009 8:53 PM
> To: momentics-community
> Subject: Re: problem with clock_settime() function on QNX 6.4.0
>
> If System("date") is showing the correct date/time then the system clock must have been set.
> How are you determining that the date wasn't set correctly?
>
> soujanya Yelchuri wrote:
>> If I give
>>
>>       stime.tv_nsec = 0;
>>       stime.tv_sec += (60*60)*24L;  /* Add one day */
>>       // Set the time
>>       if( clock_settime(CLOCK_REALTIME,&stime) == -1 )
>>       {
>>               perror( "could not setclock" );
>>       }
>>       System("date");
>>
>> Then its able to show the latest date.
>> If I remove System("date"); then its unable to set the new time.
>>
>>
>> Regards,
>> Soujanya Yelchuri
>>
>> -----Original Message-----
>> From: Colin Burgess [mailto:community-noreply@qnx.com]
>> Sent: Wednesday, August 19, 2009 8:42 PM
>> To: momentics-community
>> Subject: Re: problem with clock_settime() function on QNX 6.4.0
>>
>> Ok, so to clarify
>>
>> this worked on 6.3.0
>> it doesn't set the system clock on 6.4.0
>>
>> does the date utility work (to set the clock?) - it uses clock_settime too.
>>
>> Colin
>>
>> soujanya Yelchuri wrote:
>>>      stime.tv_nsec = 0;
>>>      stime.tv_sec += (60*60)*24L;  /* Add one day */
>>>      // Set the time
>>>      if( clock_settime(CLOCK_REALTIME,&stime) == -1 )
>>>      {
>>>              perror( "could not setclock" );
>>>      }
>>>
>>>
>>> -----Original Message-----
>>> From: Colin Burgess [mailto:community-noreply@qnx.com]
>>> Sent: Wednesday, August 19, 2009 8:32 PM
>>> To: momentics-community
>>> Subject: Re: problem with clock_settime() function on QNX 6.4.0
>>>
>>> Can you post an example of the code you are using?
>>>
>>> soujanya Yelchuri wrote:
>>>> hi,
>>>> I am migrating our application from QNX 630 to QNX 6.4.0 on PPC 8270 target.
>>>> I am facing issues with clocksettime() function to set the system clock.
>>>> The input parameter to that function is the address of a  time spec structure.
>>>> The values passed to tv_sec,tv_nsec are fine.
>>>> But unable to set the system clock as per the values.
>>>> In the QNX release notes its noted that if tv_nsec > 100 million the function will return an error EINVAL.
>>>> The function is not returning any error still its not setting the system time.
>>>> Do i need to set any proccessor plag for the function to work??
>>>> Is there any limitation on "tv_sec " value also??
>>>>...

yes.

________________________________________
From: Colin Burgess [community-noreply@qnx.com]
Sent: Wednesday, August 19, 2009 10:51 PM
To: momentics-community
Subject: Re: problem with clock_settime() function on QNX 6.4.0

So basically, if I can get you to confirm...

clock_settime(CLOCK_REALTIME, &atime);
clock_gettime(CLOCK_REALTIME, &btime);

then btime makes sense (ie it reflects the update from atime, ie a date or so in the future)

whereas

clock_settime(CLOCK_REALTIME, &atime);

... wait 5 mins ...

date

does NOT show the updated time?

soujanya Yelchuri wrote:
> if i call system("date");
> after some time around 5 mins at the end of my statup
> its unable to show the time what i set..
> what i mean to say is the clock_settime() function is unable to set the date and time.
> if iam accessing the date immediately after setting date then its able to update the new time else no
> thats my oservation..may be wrong..
>
>
> ________________________________________
> From: Colin Burgess [community-noreply@qnx.com]
> Sent: Wednesday, August 19, 2009 8:53 PM
> To: momentics-community
> Subject: Re: problem with clock_settime() function on QNX 6.4.0
>
> If System("date") is showing the correct date/time then the system clock must have been set.
> How are you determining that the date wasn't set correctly?
>
> soujanya Yelchuri wrote:
>> If I give
>>
>>       stime.tv_nsec = 0;
>>       stime.tv_sec += (60*60)*24L;  /* Add one day */
>>       // Set the time
>>       if( clock_settime(CLOCK_REALTIME,&stime) == -1 )
>>       {
>>               perror( "could not setclock" );
>>       }
>>       System("date");
>>
>> Then its able to show the latest date.
>> If I remove System("date"); then its unable to set the new time.
>>
>>
>> Regards,
>> Soujanya Yelchuri
>>
>> -----Original Message-----
>> From: Colin Burgess [mailto:community-noreply@qnx.com]
>> Sent: Wednesday, August 19, 2009 8:42 PM
>> To: momentics-community
>> Subject: Re: problem with clock_settime() function on QNX 6.4.0
>>
>> Ok, so to clarify
>>
>> this worked on 6.3.0
>> it doesn't set the system clock on 6.4.0
>>
>> does the date utility work (to set the clock?) - it uses clock_settime too.
>>
>> Colin
>>
>> soujanya Yelchuri wrote:
>>>      stime.tv_nsec = 0;
>>>      stime.tv_sec += (60*60)*24L;  /* Add one day */
>>>      // Set the time
>>>      if( clock_settime(CLOCK_REALTIME,&stime) == -1 )
>>>      {
>>>              perror( "could not setclock" );
>>>      }
>>>
>>>
>>> -----Original Message-----
>>> From: Colin Burgess [mailto:community-noreply@qnx.com]
>>> Sent: Wednesday, August 19, 2009 8:32 PM
>>> To: momentics-community
>>> Subject: Re: problem with clock_settime() function on QNX 6.4.0
>>>
>>> Can you post an example of the code you are using?
>>>
>>> soujanya Yelchuri wrote:
>>>> hi,
>>>> I am migrating our application from QNX 630 to QNX 6.4.0 on PPC 8270 target.
>>>> I am facing issues with clocksettime() function to set the system clock.
>>>> The input parameter to that function is the address of a  time spec structure.
>>>> The values passed to tv_sec,tv_nsec are fine.
>>>> But unable to set the system clock as per the values.
>>>> In the QNX release notes its noted that if tv_nsec > 100 million the function will return an error EINVAL.
>>>> The function is not returning any error still its not setting the system...