Re: dial-up vs ethernet

On Dec 16, 1:50 pm, Lew Pitcher <lpitc...@xxxxxxxxxxxx> wrote:
Mike wrote:
On Dec 15, 11:51 pm, Grant Edwards <gra...@xxxxxxxx> wrote:
On 2007-12-16, Mike <michael.h.william...@xxxxxxxxx> wrote:

Will a generic web-browser work with dial-up internet service
(over a modem)?
Yes.

If it normally used socket() type system calls for network
communication, what would it use instead?
It would still use socket() type system calls.

Thanks, that helps.

I am still curious, though.
Are the socket() calls not different? (PF_UNIX instead of PF_INET)

No. To access TCP/IP, the socket calls will always use PF_INET (or PF_INET6
for the up-and-coming TCP/IP v6). The OS (in this case, the TCP/IP stack
within the OS) decides how to manipulate TCP/IP so that it is transported over
PPP on a phone line or over Ethernet on 100BaseT.

OK, thanks. I have another question, though.

Am I correct in assuming that a program that establishes a PPP
connection
(using an external modem) is a user space program? If so, how does
this user-space
program inform the kernel that TCP/IP is available over the serial
port?

-Mike
.

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