[tor-bugs] #21654 [Core Tor/Tor]: Don't use fgets() when we might get EAGAIN

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#21654: Don't use fgets() when we might get EAGAIN
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 Reporter:  nickm         |          Owner:  ahf
     Type:  defect        |         Status:  needs_review
 Priority:  Medium        |      Milestone:  Tor: unspecified
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:                |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
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Comment (by nickm):

 Hm.  I wonder if we should propagate this switch from FILE to fileno even
 higher in the read_all_handle code.  That is, on anything where we call
 tor_read_all_handle, we shouldn't be using fgets() at all: It's not safe
 to mix buffered IO (like FILE) does and non-buffered IO.

 Alternatively, for an easier alternative, we can try turning off buffering
 on these particular FILEs.  I forget how to do that.  setvbuf?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21654#comment:4>
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