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Linux manual page describes some possible situations where close() returns -1 on valid file descriptors: Not checking the return value of close() is a common but nevertheless serious programming error. It is quite possible that errors on a previous write(2) operation are first reported at the final close(). Not checking the return value when ...


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Hint: (Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.) Try running netstat using sudo, i.e. sudo netstat ...


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tshark, the command line interface of Wireshark, can be instructed to stop capturing after certain conditions with the option -a. You can stop capturing after writing 60MB. This isn't the same thing as measuring traffic, since it depends on the file encoding, but it should be close enough for most purpose (and anyway the exact traffic depends at which ...


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The URL you referenced is the official documentation. If it's incomplete or not helping, you'll need to talk tot he maintainers of that site to address those issues, but that is the offical, blessed, sanctified, formal, certified, everything-else-ified documentation.


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You have to run the iperf in server mode on one device iperf -s and iperf in client mode on the other iperf -c IPADRESSOFSERVER at the same time.



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