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Top Forums Programming Any one can tell me how this happen? Post 37081 by jiangyanna on Wednesday 11th of June 2003 10:49:54 PM
Old 06-11-2003
Quote:
Originally posted by yogie
When You do fork() process' address space is being copied. If it happens before prinft()'s buffers are flushed, buffer's content is inherited by child process, and then printf()'ed by it, so You get the same output twice (from child and parent process).If flushing is delayed buffers can be inherited over and over (bysare scheduled by OS, running program many times can give different results (different order).

Good Luck!
thanks

but i still have some doubts!
that is where does the printf save it's buffer and how does the buffer being copied?
does the process save it's buffer in it's struct user?or in it's data area?

and how does the OS know it's line-buffered or block-buffered?
Is there a flag in it?
 

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