On Tue, 23 Jan 2007 16:44:10 +1100 Herbert Xu <[EMAIL PROTECTED]> wrote:
> dean gaudet <[EMAIL PROTECTED]> wrote: > > in the test program below the getsockname result on a TCP socket changes > > across a write which produces EPIPE... here's a fragment of the strace: > > > > getsockname(3, {sa_family=AF_INET, sin_port=htons(37636), > > sin_addr=inet_addr("127.0.0.1")}, [17863593746633850896]) = 0 > > ... > > write(3, "hi!\n", 4) = 4 > > write(3, "hi!\n", 4) = -1 EPIPE (Broken pipe) > > --- SIGPIPE (Broken pipe) @ 0 (0) --- > > getsockname(3, {sa_family=AF_INET, sin_port=htons(59882), > > sin_addr=inet_addr("127.0.0.1")}, [16927060683038654480]) = 0 > > > > why does the port# change? this is on 2.6.19.1. > > Prior to the last write, the socket entered the CLOSED state meaning > that the old port is no longer allocated to it. As a result, the > last write operates on an unconnected socket which causes a new local > port to be allocated as an autobind. It then fails because the socket > is still not connected. Why does write cause an autobind? One would think that on a SOCK_STREAM socket, the write should just fail with ENOTCONN > > So any attempt to run getsockname after an error on the socket is > simply buggy. > > Cheers, -- Stephen Hemminger <[EMAIL PROTECTED]> - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html