[haiku-bugs] Re: [Haiku] #5520: IsWritable / IsReadable methods do not currently check Write/Read mode bits.
- From: "stippi" <trac@xxxxxxxxxxxx>
- Date: Wed, 03 Mar 2010 13:57:52 -0000
#5520: IsWritable / IsReadable methods do not currently check Write/Read mode
bits.
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Reporter: ver | Owner: axeld
Type: enhancement | Status: closed
Priority: normal | Milestone: R1
Component: Kits/Storage Kit | Version: R1/Development
Resolution: invalid | Keywords: IsWritable IsReadable BFile
Blockedby: | Platform: All
Blocking: |
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Comment(by stippi):
ver, what you seem to be missing, and what the other commenters write
between the lines only (unless I overlooked it), is that the open mode of
a BFile object cannot change. You create a new BFile object, or you call
SetTo() on an existing BFile object. In both cases, you have to provide
the open mode. What you seem to be missing is that this operation will
simply fail if the desired open mode is not allowed. You cannot create
BFile with B_READ_FILE | B_WRITE_FILE, have it succeed and in reality, the
file is only readable. Instead, SetTo() or InitCheck() will return an
error code, and you just cannot use the object. That's why there is no
problem with IsWritable() and IsReadable() at all, since the mode cannot
change after construction or SetTo(). The usecase you pointed out with the
user changing permissions of the file makes no sense, since StyledEdit for
example would have to reopen the file internally, for any changes to take
affect, it won't have an affect on already open BFile objects.
--
Ticket URL: <http://dev.haiku-os.org/ticket/5520#comment:7>
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