[SR-2107] LIBDispatch DispatchIO read Max Int not reading until EOF

[swift-ci]

Previous ID	SR-2107
Radar	None
Original Reporter	sandmman (JIRA User)
Type	Bug

Environment

OSX Xcode 8

Additional Detail from JIRA

Votes	1
Component/s	libdispatch
Labels	Bug, SDKOverlay
Assignee	None
Priority	Medium

md5: 8a4cf83f85fd0da59a4731c667e0be19

Issue Description:

Although the previous iteration of dispatch_io_read() allows you to pass the value SIZE_MAX as the length in order to read the entire file until an EOF character is reached, DispatchIO.read() no longer supports this. Instead giving the value ```Int.max``` leads the channel to wait indefinitely until the max size is available to read.

[belkadan]

Hm. Int.max is different from SIZE_MAX. I wonder if -1 would work, but that still may not be the interface we want for the "Swifty" Dispatch. mww (JIRA User), what do you think?

[swift-ci]

Comment by Riley Avron (JIRA)

Note that it's possible to get the "until EOF" behavior by passing Int(bitPattern: SIZE_MAX). Note too that there was an explicit decision to import size_t as Int. I'm not sure where that leaves us in terms of the right API here.

[belkadan]

cc ktopley-apple (JIRA User)

[swift-ci]

Comment by Kim Topley (JIRA)

Probably we should consider adding an explicit API for reading to end of file instead of relying on a particular length.

[swift-ci]

Comment by Kim Topley (JIRA)

Filed rdar://problem/34663502 to track this issue.