PCAP_LIST_DATALINKS - Online Linux Manual PageSection : 3PCAP
Updated : 25 July 2018

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NAMEpcap_list_datalinks, pcap_free_datalinks − get a list of link-layer header types supported by a capture device, and free that list

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SYNOPSIS#include <pcap/pcap.h> int pcap_list_datalinks(pcap_t *p, int **dlt_buf); void pcap_free_datalinks(int *dlt_list);

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DESCRIPTIONpcap_list_datalinks() is used to get a list of the supported link-layer header types of the interface associated with the pcap descriptor. pcap_list_datalinks() allocates an array to hold the list and sets *dlt_buf to point to that array. The caller is responsible for freeing the array with pcap_free_datalinks(), which frees the list of link-layer header types pointed to by dlt_list. It must not be called on a pcap descriptor created by ­pcap_create(3PCAP) that has not yet been activated by ­pcap_activate(3PCAP).

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RETURN VALUEpcap_list_datalinks() returns the number of link-layer header types in the array on success, PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has been created but not activated, and PCAP_ERROR on other errors. If PCAP_ERROR is returned, pcap_geterr(3PCAP) or ­pcap_perror(3PCAP) may be called with p as an argument to fetch or display the error text.

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SEE ALSOpcap(3PCAP), pcap_datalink_val_to_name(3PCAP), pcap-linktype(7) 0

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