27852ebe | 21-Feb-2016 |
David van Moolenbroek <david@minix3.org> |
UDS: full rewrite
This new implementation of the UDS service is built on top of the libsockevent library. It thereby inherits all the advantages that libsockevent brings. However, the fundamental
UDS: full rewrite
This new implementation of the UDS service is built on top of the libsockevent library. It thereby inherits all the advantages that libsockevent brings. However, the fundamental restructuring required for that change also paved the way for resolution of a number of other important open issues with the old UDS code. Most importantly, the rewrite brings the behavior of the service much closer to POSIX compliance and NetBSD compatibility. These are the most important changes:
- due to the use of libsockevent, UDS now supports multiple suspending calls per socket and a large number of standard socket flags and options; - socket address matching is now based on <device,inode> lookups instead of canonized path names, and socket addresses are no longer altered either due to canonization or at connect time; - the socket state machine is now well defined, most importantly resolving the erroneous reset-on-EOF semantics of the old UDS, but also allowing socket reuse; - sockets are now connected before being accepted instead of being held in connecting state, unless the LOCAL_CONNWAIT option is set on either the connecting or the listening socket; - connect(2) on datagram sockets is now supported (needed by syslog), and proper datagram socket disconnect notification is provided; - the receive queue now supports segmentation, associating ancillary data (in-flight file descriptors and credentials) with each segment instead of being kept fully separately; this is a POSIX requirement (and needed by tmux); - as part of the segmentation support, the receive queue can now hold as many packets as can fit, instead of one; - in addition to the flags supported by libsockevent, the MSG_PEEK, MSG_WAITALL, MSG_CMSG_CLOEXEC, MSG_TRUNC, and MSG_CTRUNC send and receive flags are now supported; - the SO_PASSCRED and SO_PEERCRED socket options are replaced by LOCAL_CREDS and LOCAL_PEEREID respectively, now following NetBSD semantics and allowing use of NetBSD libc's getpeereid(3); - memory usage is reduced by about 250 KB due to centralized in-flight file descriptor tracking, with a limit of OPEN_MAX total rather than of OPEN_MAX per socket; - memory usage is reduced by another ~50 KB due to removal of state redundancy, despite the fact that socket path names may now be up to 253 bytes rather than the previous 104 bytes; - compared to the old UDS, there is now very little direct indexing on the static array of sockets, thus allowing dynamic allocation of sockets more easily in the future; - the UDS service now has RMIB support for the net.local sysctl tree, implementing preliminary support for NetBSD netstat(1).
Change-Id: I4a9b6fe4aaeef0edf2547eee894e6c14403fcb32
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a150b26e | 29-Aug-2016 |
Antoine Leca <Antoine.Leca.1@gmail.com> |
Improve the process for GNU tools
Split the process to fetch GNU tools (until now embedded within tools/Makefile.gnuhost) into a new Makefile.fetchgnu, MINIX-specific hence relocated, which is to be
Improve the process for GNU tools
Split the process to fetch GNU tools (until now embedded within tools/Makefile.gnuhost) into a new Makefile.fetchgnu, MINIX-specific hence relocated, which is to be also used to fetch sources even when not building the tools. Use it for binutils too. Improve documentation.
Also do not run configure on each run when MKUPDATE=yes The .WAIT serialization instruction between fetching and other configure sources was raising a new run of configure at each compilation. Avoid it by using two rules.
Change-Id: Ie24950ccbb5c5067f3c1ea57b7bd8294e4c9445e
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