tail head cat sleep
QR code linking to this page
Main index Section 3
Go to:
Options

Manual Pages  — PCAP_LIST_DATALINKS

NAME

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

CONTENTS

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.

It must not be called on a pcap descriptor created by  pcap_create(3) that has not yet been activated by  pcap_activate(3).

RETURN VALUE

pcap_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(3) or  pcap_perror(3) may be called with p as an argument to fetch or display the error text.

SEE ALSO

pcap(3), pcap_datalink_val_to_name(3), pcap-linktype(7)
25 July 2018 PCAP_LIST_DATALINKS (3)
tail head cat sleep
QR code linking to this page
Main index Section 3
Go to:
Options

Please direct any comments about this manual page service to Ben Bullock. Privacy policy.

“ Like a classics radio station whose play list spans decades, Unix simultaneously exhibits its mixed and dated heritage. There's Clash-era graphics interfaces; Beatles-era two-letter command names; and systems programs (for example, ps) whose terse and obscure output was designed for slow teletypes; Bing Crosby-era command editing (# and @ are still the default line editing commands), and Scott Joplin-era core dumps. ”
— The Unix Haters' handbook