pcap_set_buffer_size.3pcap - Man Page

#include <pcap/pcap.h>

int pcap_set_buffer_size(pcap_t *p, int buffer_size);

pcap_set_buffer_size() sets the buffer size that will be used on a capture handle when the handle is activated to buffer_size, which is in units of bytes.

pcap_set_buffer_size() returns 0 on success or PCAP_ERROR_ACTIVATED if called on a capture handle that has been activated.

pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP)