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libpcap
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Allow pcap_open_live() to return warnings in ebuf.

This commit is contained in:
fenner 2001-04-30 16:10:51 +00:00
parent 42f0938c7c
commit 0cc259467a
2 changed files with 19 additions and 5 deletions
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10
pcap-bpf.c
View File

@ -20,7 +20,7 @@
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/libpcap/pcap-bpf.c,v 1.44 2000-10-28 00:01:28 guy Exp $ (LBL)";
"@(#) $Header: /tcpdump/master/libpcap/pcap-bpf.c,v 1.45 2001-04-30 16:10:51 fenner Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
@ -340,9 +340,13 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
#endif /* BIOCIMMEDIATE */
#endif /* _AIX */
if (promisc)
if (promisc) {
/* set promiscuous mode, okay if it fails */
(void)ioctl(p->fd, BIOCPROMISC, NULL);
if (ioctl(p->fd, BIOCPROMISC, NULL) < 0) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCPROMISC: %s",
pcap_strerror(errno));
}
}
if (ioctl(fd, BIOCGBLEN, (caddr_t)&v) < 0) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCGBLEN: %s",

14
pcap.3
View File

@ -1,4 +1,4 @@
.\" @(#) $Header: /tcpdump/master/libpcap/Attic/pcap.3,v 1.20 2001-03-26 10:21:31 guy Exp $
.\" @(#) $Header: /tcpdump/master/libpcap/Attic/pcap.3,v 1.21 2001-04-30 16:10:51 fenner Exp $
.\"
.\" Copyright (c) 1994, 1996, 1997
.\" The Regents of the University of California. All rights reserved.
@ -135,10 +135,20 @@ to arrive and to read multiple packets from the OS kernel in one
operation. Not all platforms support a read timeout; on platforms that
don't, the read timeout is ignored.
.I ebuf
is used to return error text and is only set when
is used to return error or warning text. It will be set to error text when
.B pcap_open_live()
fails and returns
.BR NULL .
.I ebuf
may also be set to warning text when
.B pcap_open_live()
succeds; to detect this case the caller should store a zero-length string in
.I ebuf
before calling
.B pcap_open_live()
and display the warning to the user if
.I ebuf
is no longer a zero-length string.
.PP
.B pcap_open_dead()
is used for creating a