pcap_setnonblock - ing mode on a capture device
#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);
PCAP_SETNONBLOCK(3pcap) PCAP_SETNONBLOCK(3pcap)
NAME
pcap_setnonblock, pcap_getnonblock - set or get the state of non-block-
ing 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 non-
block argument is non-zero or zero. It has no effect on ``savefiles''.
If there is an error, PCAP_ERROR 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(3PCAP) will, if no packets are currently available to be
read, return 0 immediately rather than blocking waiting for packets to
arrive. pcap_loop(3PCAP) and pcap_next(3PCAP) will not work in ``non-
blocking'' mode.
When first activated with pcap_activate(3PCAP) or opened with
pcap_open_live(3PCAP) , 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, PCAP_ERROR is returned and errbuf is filled in with an appro-
priate error message.
errbuf is assumed to be able to hold at least PCAP_ERRBUF_SIZE chars.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+------------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+------------------------+
|Availability | system/library/libpcap |
+---------------+------------------------+
|Stability | Uncommitted |
+---------------+------------------------+
SEE ALSO
pcap(3PCAP), pcap_next_ex(3PCAP), pcap_geterr(3PCAP)
NOTES
Source code for open source software components in Oracle Solaris can
be found at https://www.oracle.com/downloads/opensource/solaris-source-
code-downloads.html.
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from https://www.tcpdump.org/release/libp-
cap-1.9.1.tar.gz.
Further information about this software can be found on the open source
community website at https://www.tcpdump.org/.
25 July 2018 PCAP_SETNONBLOCK(3pcap)