1PCAP_LIST_DATALINKS(3PCAP) PCAP_LIST_DATALINKS(3PCAP)
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6 pcap_list_datalinks, pcap_free_datalinks - get a list of link-layer
7 header types supported by a capture device, and free that list
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10 #include <pcap/pcap.h>
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12 int pcap_list_datalinks(pcap_t *p, int **dlt_buf);
13 void pcap_free_datalinks(int *dlt_list);
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16 pcap_list_datalinks() is used to get a list of the supported link-layer
17 header types of the interface associated with the pcap descriptor.
18 pcap_list_datalinks() allocates an array to hold the list and sets
19 *dlt_buf to point to that array.
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21 The caller is responsible for freeing the array with
22 pcap_free_datalinks(), which frees the list of link-layer header types
23 pointed to by dlt_list.
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25 It must not be called on a pcap descriptor created by
26 pcap_create(3PCAP) that has not yet been activated by
27 pcap_activate(3PCAP).
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30 pcap_list_datalinks() returns the number of link-layer header types in
31 the array on success, PCAP_ERROR_NOT_ACTIVATED if called on a capture
32 handle that has been created but not activated, and PCAP_ERROR on other
33 errors. If PCAP_ERROR is returned, pcap_geterr(3PCAP) or
34 pcap_perror(3PCAP) may be called with p as an argument to fetch or dis‐
35 play the error text.
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38 pcap(3PCAP), pcap_datalink_val_to_name(3PCAP), pcap-linktype(7)
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42 25 July 2018 PCAP_LIST_DATALINKS(3PCAP)