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authorJulian Andres Klode <jak@debian.org>2018-01-02 22:15:50 +0100
committerJulian Andres Klode <jak@debian.org>2018-01-03 15:31:36 +0100
commit3bbd328396745d0dd6c5585935040082a2c41e3e (patch)
tree6a3ddf1026c286cc528c04ae3bbb55ad653228d2 /doc/apt-extracttemplates.1.xml
parent53bdec3ebea66153b320ee497871355eb526e0f2 (diff)
Add rapid "happy eyeballs" connection fallback (RFC 8305)
Try establishing connections in alternating address families in rapid intervals of 250 ms, adding more connections to the wait list until one succeeds (RFC 8305, happy eyeballs 2). It is important that WaitAndCheckErrors() waits until it has a successful connection, a time out, or all connections failed - otherwise the timing between tries might be wrong, and the final long wait might exit early because one connection failed without trying the others. Timing wise, this only works correctly on Linux, as select() counts down there. But we rely on that in some other places too, so this is not the time to fix that. Timeouts are only reported in the final long wait - the short inner waits are expected to time out more often, and multiple times, we do not want to report them. Closes: #668948 LP: #1308200 Gbp-Dch: paragraph
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