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Operating Systems HP-UX How To Rotate A File in HP-UX? Post 302869679 by alister on Wednesday 30th of October 2013 06:13:48 PM
Old 10-30-2013
Quote:
Originally Posted by vbe
What I dont understand is if the file is zeroed ( >file) how come it the next minute be greater than previously...
Quote:
Originally Posted by MadeInGermany
Code:
man open

tells that the O_APPEND flag in open() jumps to the end of the (with the old file size) prior to every write.
That's incorrect. Before each write(), O_APPEND sets the descriptor's offset to the current end of file. If a file opened with O_APPEND is truncated to 0 size, the next write would see that and would place its bytes at the beginning of the file.

What we're seeing here is the absence of O_APPEND. Truncation does not affect the offsets of open file descriptions, so, without O_APPEND, writes continue where they had been located before truncation; file size is restored with null bytes replacing what had been truncated.

Regards,
Alister
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