Do not open logfiles with read access #291
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Currently logfiles are opened with read-access, due to cupsFileOpen()
converting "a" into
O_RDWR | O_CREAT | O_APPEND
. This should not benecessary, as logfiles should be an append-only data structure.
Update cupsFileOpen() to open files with
O_WRONLY | O_CREAT | O_APPEND
on mode "a" and add a fallback mode "a+" (see man:fopen(3)).
Currently only the logfiles and a test file are opened with "a".