On Tue, Jul 16, 2002 at 09:21:17AM -0700, Fulvio Risso wrote:
> We're going to release a preview of the new WinPcap which has a new
> pcap_read_ex(), which does what you're looking for.
It should also be possible to implement "pcap_setnonblock()" and
"pcap_getnonblock()" for WinPcap.
Add "int" fields "timeout" and "nonblock" to the set of Win32-specific
fields in a "struct pcap".
In "pcap_open_live()", set "timeout" to the "to_ms" argument and set
"nonblock" to 1 if "to_ms" is -1 and 0 otherwise.
"pcap_setnonblock()" and "pcap_getnonblock()" would be
/*
* NOTE: in the future, these may need to call platform-dependent routines,
* e.g. on platforms with memory-mapped packet-capture mechanisms where
* "pcap_read()" uses "select()" or "poll()" to wait for packets to arrive.
*/
int
pcap_getnonblock(pcap_t *p, char *errbuf)
{
#ifndef WIN32
int fdflags;
#endif
if (p->sf.rfile != NULL) {
/*
* This is a savefile, not a live capture file, so
* never say it's in non-blocking mode.
*/
return (0);
}
#ifndef WIN32
fdflags = fcntl(p->fd, F_GETFL, 0);
if (fdflags == -1) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s",
pcap_strerror(errno));
return (-1);
}
if (fdflags & O_NONBLOCK)
return (1);
else
return (0);
#else
return (p->nonblock);
#endif
}
int
pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf)
{
#ifndef WIN32
int fdflags;
#else
int newtimeout;
#endif
if (p->sf.rfile != NULL) {
/*
* This is a savefile, not a live capture file, so
* ignore requests to put it in non-blocking mode.
*/
return (0);
}
#ifndef WIN32
fdflags = fcntl(p->fd, F_GETFL, 0);
if (fdflags == -1) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s",
pcap_strerror(errno));
return (-1);
}
if (nonblock)
fdflags |= O_NONBLOCK;
else
fdflags &= ~O_NONBLOCK;
if (fcntl(p->fd, F_SETFL, fdflags) == -1) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_SETFL: %s",
pcap_strerror(errno));
return (-1);
}
#else
if (nonblock) {
/*
* Set the read timeout to -1 for non-blocking mode.
*/
newtimeout = -1;
} else {
/*
* Restore the timeout set when the device was opened.
* (Note that this may be -1, in which case we're not
* really leaving non-blocking mode.)
*/
newtimeout = p->timeout;
}
if (!PacketSetReadTimeout(p->adapter, newtimeout)) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"PacketSetReadTimeout: %s", pcap_win32strerror());
return (-1);
}
p->nonblock = (newtimeout == -1);
#endif
return (0);
}
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