Couldn't parse filter scr port 22000: syntax error

[wen lui <esolvepolito () gmail com>]

Hi, all

    I used the following filter rules to capture packets,

         tcpdump -i eth0 src port 22000

   it works fine, however, when I used it libpcap functions pcap_compile()
and pcap_setfilter()

   it output an error: Couldn't parse filter scr port 22000: syntax error


   what is wrong with this? thanks!
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