31 Mar
2017
31 Mar
'17
12:11 a.m.
Norman Wilson <norman(a)oclsc.org> wrote:
But is IP done that way in SVr4 (or at least in
Solaris, its
most-visible descendant)? I had the impression that the
IP stack was more like the BSD one, with everything coupled
together within the kernel and a fundamentally socket interface.
The code has been implemented in a way that mainly differs in that "ifconfig"
needs to be called with "ifconfig <ifname> plumb" before you can use the
interface.
In former times, sockets have been emulated in userland, but this prevents a
socket filedescriptor returned from a dup(sockfd) to work as expected. As a
result, POSIX later required sockets to be an integral part of the
implementation and sockets went into the kernel again.
BTW: there was a paper from Sun that explains that sockets are faster then
using the STREAMS based t_open() and friends.
Jörg
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