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PCAP_SET_IMMEDIATE_MODE
Section: Misc. Reference Manual Pages (3PCAP) Updated: 23 August 2018 Index
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NAME
pcap_set_immediate_mode - set immediate mode for a no-ye-activated capture
handle
SYNOPSIS
#include <pcap/pcap.h>
int pcap_set_immediate_mode(pcap_t *p, int immediate_mode);
DESCRIPTION
pcap_set_immediate_mode()
sets whether immediate mode should be set on a capture handle when
the handle is activated. In immediate mode, packets are always
delivered as soon as they arrive, with no buffering.
If
immediate_mode
is no-zero, immediate mode will be set, otherwise it will not be set.
RETURN VALUE
pcap_set_immediate_mode()
returns
0
on success or
PCAP_ERROR_ACTIVATED
if called on a capture handle that has been activated.
BACKWARD COMPATIBILITY
This function became available in libpcap release 1.5.0. In previous
releases, if immediate delivery of packets is required:
-
on FreeBSD, NetBSD, OpenBSD, DragonFly BSD, macOS, and Solaris 11,
immediate mode must be turned on with a
BIOCIMMEDIATE
ioctl(2),
as documented in
bpf(4),
on the descriptor returned by
pcap_fileno(3PCAP),
after
pcap_activate(3PCAP)
is called;
-
on Solaris 10 and earlier versions of Solaris, immediate mode must be
turned on by using a read timeout of 0 when opening the device (this
will not provide immediate delivery of packets on other platforms, so
don't assume it's sufficient);
-
on Digital UNIX/Tru64 UNIX, immediate mode must be turned on by doing a
BIOCMBIC
ioctl(),
as documented in
packetfilter(7),
to clear the
ENBATCH
flag on the descriptor returned by
pcap_fileno(3PCAP),
after
pcap_activate(3PCAP)
is called;
-
on Windows, immediate mode must be turned on by calling
pcap_setmintocopy()
with a size of 0.
On Linux, with previous releases of libpcap, capture devices are always
in immediate mode; however, in 1.5.0 and later, they are, by default,
not
in immediate mode, so if
pcap_set_immediate_mode()
is available, it should be used.
On other platforms, capture devices are always in immediate mode.
SEE ALSO
pcap(3PCAP),
pcap_create(3PCAP),
pcap_activate(3PCAP)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- BACKWARD COMPATIBILITY
-
- SEE ALSO
-
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