03-16-2007
Sorry Reborg. The intention to bump was two fold.
To show my desperation and the other to rephrase my question.
Pardon a rookie.
Buffer is sufficiently big enough. the sokcet is non blocking. What would cause an operation blocking? Even if it turns out to be blocking, why did the operation succeed and the message sent out?
This will be my last attempt to bump the thread and solicit answers. Thanks in advance.
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LEARN ABOUT FREEBSD
pcap_setnonblock
PCAP_SETNONBLOCK(3) Library Functions Manual PCAP_SETNONBLOCK(3)
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.
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(3), pcap_loop(3), pcap_next_ex(3), pcap_geterr(3)
5 April 2008 PCAP_SETNONBLOCK(3)