...
tcp4 0 0 1.2.3.4.* 4.5.6.7.42149 CLOSED
tcp4 39 0 1.2.3.4.* 4.5.6.7.54103 CLOSED
tcp4 35 0 1.2.3.4.* 4.5.6.7.41718 CLOSED
tcp4 38 0 1.2.3.4.* 4.5.6.7.55618 CLOSED
tcp4 41 0 1.2.3.4.* 4.5.6.7.44230 CLOSED
tcp4 39 0 1.2.3.4.* 4.5.6.7.49439 CLOSED
...
These never go away; they gradually increase and increase until the
application starts giving errors (probably because some socket or
filedescriptor limit is reached). When the application is killed these
entries disappear.
The application in question is a self written DNS server, multithreaded, and
running fine for years without any troubles on both BSD 5.x as well as 6.x.
Also 32bits as well as 64bits on 6.x.
do "stupid" thing - in your source add
#define socket TEST_SOCKET
#define connect TEST_CONNECT
#define bind TEST_BIND
#define listen TEST_LISTEN
....all other network functions you use same way here!
and write one .c program where all these TEST_* functions are defined,
doing the same as original PLUS logging to file.
after a while (when you see this closed/unclosed connections) stop it and
look at logs.
i'm almost sure you will notice where is a problem.
possibly threads implementation changed...
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