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naturally, it's opt-in
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We use libseccomp, which is now a semi-mandatory dependency on Linux.
(You can still build without it, but only if you pass a scary long flag
to make.)
For this to work I had to disable getTimezoneOffset, which would
otherwise call localtime_r which in turn reads in some files from
/usr/share/zoneinfo. To allow this we would have to give unrestricted
openat(2) access to buffer processes, which is unacceptable.
(Giving websites access to the local timezone is a fingerprinting vector
so if this ever gets fixed then it should be an opt-in config setting.)
This patch also includes misc fixes to buffer cloning, and fixes the
LIBEXECDIR override in the makefile so that it is actually useful.
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It's the sandboxing system of FreeBSD. Quite pleasant to work with.
(Just trying to figure out the basics with this one before tackling the
abomination that is seccomp.)
Indeed, the only non-trivial part was getting newSelector to work with
Capsicum. Long story short it doesn't, so we use an ugly pointer cast +
assignment. But even that is stdlib's "fault", not Capsicum's.
This also gets rid of that ugly SocketPath global.
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analogous to bufwriter
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Originally we had several loader processes so that the loader did not
need asynchronity for loading several buffers at once. Since then, the
scope of what loader does has been reduced significantly, and with
that loader has become mostly asynchronous.
This patch finishes the above work as follows:
* We only fork a single loader process for the browser. It is a waste of
resources to do otherwise, and would have made future work on a
download manager very difficult.
* loader becomes (almost) fully async. Now the only sync part is a)
processing commands and b) waiting for clients to consume responses.
b) is a bit more problematic than a), but should not cause problems
unless some other horrible bug exists in a client. (TODO: make it
fully async.)
This gives us a noticable improvement in CSS loading speed, since all
resources can now be queried at once (even before the previous ones
are connected).
* Buffers now only get processes when the *connection* is finished. So
headers, status code, etc. are handled by the client, and the buffer
is forked when the loader starts streaming the response body.
As a result, mailcap entries can simply dup2 the first UNIX domain
socket connection as their stdin. This allows us to remove the ugly
(and slow) `canredir' hack, which required us to send file handles on
a tour accross the entire codebase.
* The "cache" has been reworked somewhat:
- Since canredir is gone, buffer-level requests usually start
in a suspended state, and are explicitly resumed only after
the client could decide whether it wants to cache the response.
- Instead of a flag on Request and the URL as the cache key,
we now use a global counter and the special `cache:' scheme.
* misc fixes: referer_from is now actually respected by buffers (not
just the pager), load info display should work slightly better, etc.
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reimplementing it portably in Nim seems incredibly annoying, so we
just use C
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* ips -> io/
* loader related stuff -> loader/
* tempfile -> extern/
* buffer, forkserver -> server/
* lineedit, window -> display/
* cell -> types/
* opt -> types/
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