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FreeBSD APIs: Difference between revisions
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==File descriptors== | ==File descriptors== | ||
* <tt>[[kqueue|kqueue(2)]]</tt>, introduced in FreeBSD 4.1, is FreeBSD's "better <tt>poll(2)</tt>", ala <tt>[[epoll|epoll(7)]]</tt> on [[Linux APIs|Linux]]. | * <tt>[[kqueue|kqueue(2)]]</tt>, introduced in FreeBSD 4.1, is FreeBSD's "better <tt>poll(2)</tt>", ala <tt>[[epoll|epoll(7)]]</tt> on [[Linux APIs|Linux]]. | ||
* <tt>[https://man.freebsd.org/cgi/man.cgi?query=accept_filter accept_filter(9)]</tt> | |||
== Socket Options == | == Socket Options == | ||
Revision as of 00:11, 24 June 2023
I'm documenting FreeBSD's departures from known standards/APIUE/UNP as I come across them in various man pages and source code. The entirety of the FreeBSD man pages can be browsed at http://www.freebsd.org/cgi/man.cgi. This page serves as a companion to "Linux APIs" and "POSIX".
File descriptors
- kqueue(2), introduced in FreeBSD 4.1, is FreeBSD's "better poll(2)", ala epoll(7) on Linux.
- accept_filter(9)
Socket Options
SOL_SOCKET
- SO_ACCEPTFILTER (Introduced in FreeBSD 4.0): Apply an accept_filter(9) kernel module to the listen(2)ing socket. The connection will not be accept(2)able until the filter is satisfied. accf_data(9), satisfied by the receipt of any connection payload data, is roughly equivalent to Linux's TCP_DEFER_ACCEPT.
IPPROTO_TCP
- TCP_NOPUSH: Normally, every write operation to a TCP socket will result in an attempt to set the TCP PSH bit and transmit the queued data. With TCP_NOPUSH set, packets will be coalesced until either the MSS is reached, or the socket is closed. Compare to Linux's TCP_CORK.
- It is my experience that clearing this flag will result in the transmission of queued data, but I cannot find documentation supporting this. Tony Finch's kernel patch seems to have been applied to FreeBSD 4.5, providing this behavior.
