PCAP_SET_DATALINK(3PCAP)PCAP_SET_DATALINK(3PCAP)NAME
pcap_set_datalink - set the link-layer header type to be used by a capture device
SYNOPSIS
#include <pcap/pcap.h>
int pcap_set_datalink(pcap_t *p, int dlt);
DESCRIPTION
pcap_set_datalink() is used to set the current link-layer header type of the pcap descriptor to the type specified by dlt.
RETURN VALUE
pcap_set_datalink() returns 0 on success and -1 on failure. If -1 is returned, pcap_geterr() or pcap_perror() may be called with p as an
argument to fetch or display the error text.
SEE ALSO pcap(3PCAP), pcap_geterr(3PCAP), pcap_datalink_name_to_val(3PCAP)
22 August 2010 PCAP_SET_DATALINK(3PCAP)
Check Out this Related Man Page
PCAP_LIST_DATALINKS(3PCAP)PCAP_LIST_DATALINKS(3PCAP)NAME
pcap_list_datalinks, pcap_free_datalinks - get a list of link-layer header types supported by a capture device, and free that list
SYNOPSIS
#include <pcap/pcap.h>
int pcap_list_datalinks(pcap_t *p, int **dlt_buf);
void pcap_free_datalinks(int *dlt_list);
DESCRIPTION
pcap_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.
RETURN VALUE
pcap_list_datalinks() returns the number of link-layer header types in the array on success and -1 on failure. If -1 is returned,
pcap_geterr() or pcap_perror() may be called with p as an argument to fetch or display the error text.
SEE ALSO pcap(3PCAP), pcap_geterr(3PCAP), pcap_datalink_val_to_name(3PCAP), pcap-linktype(7)
22 August 2010 PCAP_LIST_DATALINKS(3PCAP)
Introduction
I have seen some misinformation regarding Unix file permissions. I will try to set the record straight. Take a look at this example of some output from ls:
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