1PCAP_SETDIRECTION(3PCAP)                              PCAP_SETDIRECTION(3PCAP)
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NAME

6       pcap_setdirection  -  set  the direction for which packets will be cap‐
7       tured
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SYNOPSIS

10       #include <pcap/pcap.h>
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12       int pcap_setdirection(pcap_t *p, pcap_direction_t d);
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DESCRIPTION

15       pcap_setdirection() is used to specify a direction that packets will be
16       captured.    d  is  one  of  the  constants  PCAP_D_IN,  PCAP_D_OUT  or
17       PCAP_D_INOUT.  PCAP_D_IN will only  capture  packets  received  by  the
18       device,  PCAP_D_OUT  will  only  capture packets sent by the device and
19       PCAP_D_INOUT will capture packets received by or sent  by  the  device.
20       PCAP_D_INOUT is the default setting if this function is not called.
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22       pcap_setdirection() isn't necessarily fully supported on all platforms;
23       some platforms might return an error for all  values,  and  some  other
24       platforms might not support PCAP_D_OUT.
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26       This operation is not supported if a ``savefile'' is being read.
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RETURN VALUE

29       pcap_setdirection()  returns 0 on success and PCAP_ERROR on failure. If
30       PCAP_ERROR is returned, pcap_geterr(3PCAP) or pcap_perror(3PCAP) may be
31       called with p as an argument to fetch or display the error text.
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SEE ALSO

34       pcap(3PCAP)
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38                                 25 July 2018         PCAP_SETDIRECTION(3PCAP)
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