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From: Daniel Blankensteiner <db@traceroute.dk>
To: freebsd-questions@freebsd.org
Subject: Descriptors
Date: Wed, 15 May 2002 18:01:46 +0200
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X-Loop: FreeBSD.ORG

Hi FL (FreeBSD lovers ;-)

I am reading about socket programming and the author wrote
that a socket is given a descriptor, like when you open a file
you get a file descriptor. The descriptors are given from the
same table, so a file and a socket can't get the same descriptor.
That is all fine, but then I run sockstat on my FreeBSD 4.5 Stable,
I get:
db# sockstat -4 -l
USER     COMMAND    PID   FD PROTO  LOCAL ADDRESS         FOREIGN ADDRESS
root          centeric        696    8   tcp4        *:49158               *:*
root          XF86_SVG   637    0   tcp4        *:6000                *:*
root          sshd             82    4    tcp4       *:22                  *:*
root          amd              72    4    udp4       *:1023                *:*
root          amd              72    5    tcp4       *:1023                *:*
root          amd              72    6    udp4       *:1022                *:*
root          amd              72    7    udp4       *:1021                *:*
daemon    portmap         70    3    udp4       *:111                 *:*
daemon    portmap         70    4    tcp4        *:111                 *:*
root         syslogd          67    5    udp4        *:514                 *:*
 
Why do some have the same FD (file descriptor)?

br
db

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