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Full Discussion: Date change related query
Top Forums UNIX for Dummies Questions & Answers Date change related query Post 27583 by auswipe on Wednesday 4th of September 2002 12:28:23 AM
Old 09-04-2002
Re: Date change related query
Quote:
Originally posted by franklo
Meaning...I need a simple unix script that I can run as crone that takes as variable the url of another server and makes my server's time that of the other server plus 2 seconds. So if it is there 9:00 pm, my server's time becomes 21:00:02
Hmmm. At first I thought this was going to be a humdinger. This is how I solved the problem of having offset time by +2 seconds:
Code:
set -- `date -v +2S`
date ` echo $4 | sed -e 's/:/ /g' | awk '{printf("%s%s.%s\n", $1, $2, $3);}'`

Give it a try, your mileage may vary. I checked this out on a FreeBSD 4.5 system. This should be in your cronjob shell script right after sync'ing the time of the box. You will probably lose several tenths of a second. I don't know how accurate you have to have your clock sync'd to the server and this might be of some consideration.

Another important note is to not execute the cronjob near midnight. If for some reason the time sync'd at 23:59:59 the above shell script would be bad as the actual date wouldn't change, but the time would be 00:00:01 of the same day, effectively setting the time back almost 24 hours.
Last edited by auswipe; 09-04-2002 at 01:34 AM..
 

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LEARN ABOUT OSX

glquerycounter

GLQUERYCOUNTER(3G)						    OpenGL 3.3							GLQUERYCOUNTER(3G)

NAME

       glQueryCounter - record the GL time into a query object after all previous commands have reached the GL server but have not yet necessarily
       executed.

C SPECIFICATION

       void glQueryCounter(GLuint id, GLenum target);

PARAMETERS

       id
	   Specify the name of a query object into which to record the GL time.

       target
	   Specify the counter to query.  target must be GL_TIMESTAMP.

DESCRIPTION

       glQueryCounter causes the GL to record the current time into the query object named id.	target must be GL_TIMESTAMP. The time is recorded
       after all previous commands on the GL client and server state and the framebuffer have been fully realized. When the time is recorded, the
       query result for that object is marked available.  glQueryCounter timer queries can be used within a glBeginQuery() / glEndQuery() block
       where the target is GL_TIME_ELAPSED and it does not affect the result of that query object.

NOTES

       glQueryCounter is available only if the GL version is 3.3 or higher.

ERRORS

       GL_INVALID_OPERATION is generated if id is the name of a query object that is already in use within a glBeginQuery() / glEndQuery() block.

       GL_INVALID_VALUE is generated if id is not the name of a query object returned from a previous call to glGenQueries().

       GL_INVALID_ENUM is generated if target is not GL_TIMESTAMP.

SEE ALSO

       glGenQueries(), glBeginQuery(), glEndQuery(), glDeleteQueries(), glGetQueryObject(), glGetQueryiv(), glGet()

COPYRIGHT

       Copyright (C) 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication
       License, v 1.0, 8 June 1999.  http://opencontent.org/openpub/.

OpenGL 3.3							    03/08/2011							GLQUERYCOUNTER(3G)
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