PCAP_SETNONBLOCK(3PCAP) 												   PCAP_SETNONBLOCK(3PCAP)

NAME

       pcap_setnonblock, pcap_getnonblock - set or get the state of non-blocking mode on a capture device

SYNOPSIS

       #include <pcap/pcap.h>

       char errbuf[PCAP_ERRBUF_SIZE];

       int pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf);
       int pcap_getnonblock(pcap_t *p, char *errbuf);

DESCRIPTION

       pcap_setnonblock()  puts  a  capture  handle into ``non-blocking'' mode, or takes it out of ``non-blocking'' mode, depending on whether the
       nonblock argument is non-zero or zero.  It has no effect on ``savefiles''.  If there is an error, -1 is returned and errbuf  is	filled	in
       with an appropriate error message; otherwise, 0 is returned.  In ``non-blocking'' mode, an attempt to read from the capture descriptor with
       pcap_dispatch() will, if no packets are currently available to be read, return 0 immediately rather than blocking waiting  for  packets	to
       arrive.	pcap_loop() and pcap_next() will not work in ``non-blocking'' mode.

       When  first  activated  with  pcap_activate() or opened with pcap_open_live() , a capture handle is not in ``non-blocking mode''; a call to
       pcap_setnonblock() is required in order to put it into ``non-blocking'' mode.

RETURN VALUE

       pcap_getnonblock() returns the current ``non-blocking'' state of the capture descriptor; it always returns 0 on ``savefiles''.  If there is
       an error, -1 is returned and errbuf is filled in with an appropriate error message.

       errbuf is assumed to be able to hold at least PCAP_ERRBUF_SIZE chars.

SEE ALSO

       pcap(3PCAP), pcap_loop(3PCAP), pcap_next_ex(3PCAP), pcap_geterr(3PCAP)

								  18 October 2014					   PCAP_SETNONBLOCK(3PCAP)