Date: Fri, 10 Nov 2000 19:55:46 -0800 From: Sriranga Veeraraghavan <ranga@CSUA.Berkeley.EDU> To: j mckitrick <jcm@FreeBSD-uk.eu.org> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: programming a file transfer Message-ID: <200011110355.TAA03941@soda.csua.Berkeley.edu> In-Reply-To: Your message of "Fri, 10 Nov 2000 19:18:44 GMT." <20001110191844.A20862@dogma.freebsd-uk.eu.org>
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Hi,
Sounds like you probably want need to use setsockopt(2), specifically
the SO_REUSEADDR.
This option allows a process to bind to a well-known port even if
other connections already use that port. For more info see Stevens,
Unix Network Programming Volume 1 2nd edition, pg 194.
Some people like SO_LINGER better than SO_REUSEADDR, but Stevens says
to use not to use SO_LINGER for various reasons (pg 187).
After you create the socket via socket(2), you should probably call
setsockopt similar to the following to get the desired behavior:
int flags = 1;
...
if (setsockopt(sock_listen, SOL_SOCKET, SO_REUSEADDR,
(void *)&flags, sizeof(flags)) < 0) {
close(sock_listen);
perror("Error");
}
HTH,
----ranga
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