progress information. The first is that fetch_read() (used in the HTTP
code but not the FTP code) can enter an infinite loop if it has previously
been interrupted by a signal. The second is that when it is interrupted,
fetch_read() will discard any data it may have read up to that point.
Luckily, both bugs are extremely timing-sensitive and therefore difficult
to trigger.
PR: bin/153240
Submitted by: Mark <markjdb@gmail.com>
MFC after: 3 weeks
2a7daafe67