sockets - what is parameter level in getsockopt? -



sockets - what is parameter level in getsockopt? -

luckily got link here [sol_socket in getsockopt()

but confusing me.

one replied "sol_socket" socket layer?

what socket layer?

is there other options available parameter?

what happens if pass parameter sol_socket , sol stands for?

i using unix.

"socket layers" refers socket abstraction of operative system. options can set independently of type of socket handling. in practice, may interested in tcp/ip sockets, there udp/ip sockets, unix domain sockets, , others. options related sol_socket can applied of them. the list provided in reply of other question has of them; in manual page of sockets there more, under "socket options" section.

sol_socket constant "protocol number" associated level. other protocols or levels, can utilize getprotoent obtain protocol number name, or check manual of protocol - example, in manual page of ip described constants protocol numbers of ip (ipproto_ip), tcp (ipproto_tcp) , udp (ipproto_udp), while manual page of unix sockets says that, historial reasons, protocol options must set using sol_socket too. moreover, can find list of supported protocols scheme in /etc/protocols. and, of course, options supported each of protocols in manuals: ip, tcp, udp, unix sockets...

sockets unix

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