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1180. By Oswald Buddenhagen <email address hidden> on 2022-07-09

document defaults of referenced XDG env vars

so users don't have to google the spec.

1179. By Oswald Buddenhagen <email address hidden> on 2022-07-05

remove duplicate contributor entry

anton khirnov is already in the main section, no need to have him in the
honorary section as well.

on a completely unrelated note, for posterity: andreas grapentin's
mention is due to commit cf13630a, where i forgot to credit him for the
initial version of the patch.

1178. By Oswald Buddenhagen <email address hidden> on 2022-07-04

make DNS lookup asynchronous

true asynchronicity is actually fairly useless, as it's unlikely that
both Stores in a Channel use IMAP, and both host resolutions take
particularly long - the main objective is imposing the Timeout setting.
however, we can't just use setjmp()+alarm(), as longjmp()ing out of
getaddrinfo() is undefined, as it may for example free() just at the
wrong time. so we go for the real thing.

this implementation just fork()s out a process which uses getaddrinfo()
(or gethostbyname()) per lookup. this isn't particularly scalable, but
as we don't expect a lot of lookups, it seems adequate.

1177. By Oswald Buddenhagen <email address hidden> on 2022-07-04

fix Tunnel leaving behind zombies

this generally went unnoticed, as the tunnel usually terminates right
before we exit anyway. however, if multiple Channels are synced, it may
become visible.

this is a "shotgun" implementation, where the main loop just reaps all
unclaimed children.
arguably, it would be cleaner if each socket actually tracked its own
process, but getting synchronous kills+waits right is tricky, so we
continue to pretend that there is no process as far as the socket layer
is concerned.

poll()/select() are not restartable, so they need EINTR handling now
that SIGCHLD is actually delivered.

1176. By Oswald Buddenhagen <email address hidden> on 2022-07-04

fix broken Tunnel potentially causing SIGPIPE

we need to ignore the signal, so the regular error handling can kick in.

1175. By Oswald Buddenhagen <email address hidden> on 2022-07-04

don't refresh progress counters pointlessly

the mainloop-based refresh timer keeps spinning even if there is no
update. overload stats_steps to signal whether a refresh is needed.

amends 8fbc4323.

1174. By Oswald Buddenhagen <email address hidden> on 2022-07-01

abort channel sync when a store is fubar

this got lost in d5a5da947.

this also simplifies a nested condition, where the logic has previously
been, but isn't applicable any more.

REFMAIL: <email address hidden>

1173. By Oswald Buddenhagen <email address hidden> on 2022-07-01

improve wording of --ext-exit docu

1172. By Oswald Buddenhagen <email address hidden> on 2022-07-01

fix lineup of --ext-exit in help output

1171. By Oswald Buddenhagen <email address hidden> on 2022-06-26

try to make AUTHORS reflect reality

make a complete list of contributors who hold copyright (and those who
don't).

the case of ted is particularly interesting - he recently disclaimed
significant contributions, but it turns out that this isn't true:
the rewrite in 130664b6 incorporated significant portions of his async
IMAP patch for debian.

speaking of debian, i deleted ted's and nicolas' mention as debian
maintainers, as debian/ is basically just a (poorly maintained) mirror,
and has an own copyright file.