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Top Forums Programming Problem with external program launch Post 302289779 by Corona688 on Friday 20th of February 2009 11:56:16 AM
Old 02-20-2009
fork() is the only way to create a new process, so system() ultimately uses it anyway. But yes, it creates and runs a shell in the process, which is a bit messy and has a performance cost. This means fork()/exec() is actually far more direct than system(), not the other way around. You can find out when a child has finished with the waitpid() call.

-2 is actually a lower priority, not a higher one; the higher the number, the higher the priority. What priority and scheduler did you modify it to to get it to function, exactly?
 

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SCREENCAPTURE(1)					    BSD General Commands Manual 					  SCREENCAPTURE(1)

NAME
screencapture -- capture images from the screen and save them to a file or the clipboard SYNOPSIS
screencapture [-SWCTMPcimswxto] file DESCRIPTION
The screencapture utility is not very well documented to date. A list of options follows. -c Force screen capture to go to the clipboard. -C Capture the cursor as well as the screen. Only allowed in non-interactive modes. -i Capture screen interactively, by selection or window. The control key will cause the screen shot to go to the clipboard. The space key will toggle between mouse selection and window selection modes. The escape key will cancel the interactive screen shot. -m Only capture the main monitor, undefined if -i is set. -M Open the taken picture in a new Mail message. -o In window capture mode, do not capture the shadow of the window. -P Open the taken picture in a Preview window. -s Only allow mouse selection mode. -S In window capture mode, capture the screen instead of the window. -t <format> Image format to create, default is png (other options include pdf, jpg, tiff and other formats). -T <seconds> Take the picture after a delay of <seconds>, default is 5. -w Only allow window selection mode. -W Start interaction in window selection mode. -x Do not play sounds. -a Do not capture attached windows. -r Do not add screen dpi meta data to captured file. files where to save the screen capture, 1 file per screen BUGS
Better documentation is needed for this utility. SECURITY CONSIDERATIONS
To capture screen content while logged in via ssh, you must launch screencapture in the same mach bootstrap hierarchy as loginwindow: PID=pid of loginwindow sudo launchctl bsexec $PID screencapture [options] HISTORY
A screencapture utility first appeared in Mac OS X v10.2. Mac OS June 16, 2004 Mac OS
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