Describe all the cases where pcap_fileno() returns a file descriptor and

where it returns -1.  Based on a patch from Fumiyuki Shimizu.

2 files changed, 30 insertions, 8 deletions

diff --git a/CREDITS b/CREDITS
index 326afa58..dbe26a65 100644
--- a/CREDITS
+++ b/CREDITS
@@ -38,6 +38,7 @@ Additional people who have contributed patches:
 	Florent Drouin			<Florent dot Drouin at alcatel-lucent dot fr>
 	Franz Schaefer			<schaefer at mond dot at>
 	Fulko Hew			<fulko dot hew at gmail dot com>
+	Fumiyuki Shimizu		<fumifumi at abacustech dot jp>
 	Gianluca Varenni		<varenni at netgroup-serv dot polito dot it>
 	Gilbert Hoyek			<gil_hoyek at hotmail dot com>
 	Gisle Vanem			<gvanem at broadpark dot no>
diff --git a/pcap_fileno.3pcap b/pcap_fileno.3pcap
index 28eac428..02d24b53 100644
--- a/pcap_fileno.3pcap
+++ b/pcap_fileno.3pcap
@@ -33,15 +33,36 @@ int pcap_fileno(pcap_t *p);
 .ft
 .fi
 .SH DESCRIPTION
-.B pcap_fileno()
-returns the file descriptor number from which captured packets are read,
-if a network device was opened with
+If
+.I p
+refers to a network device that was opened for a live capture using
+a combination of
 .B pcap_create()
 and
-.B pcap_activate()
-or with
+.BR pcap_activate() ,
+or using
 .BR pcap_open_live() ,
-or \-1, if a ``savefile'' was opened with
-.BR pcap_open_offline() .
+.B pcap_fileno()
+returns the file descriptor from which captured packets are read.
+.LP
+If
+.I p
+refers to a ``savefile'' that was opened using fuctions such as
+.BR pcap_open_offline()
+or
+.BR pcap_fopen_offline() ,
+a ``dead''
+.B pcap_t
+opened using
+.BR pcap_open_dead() ,
+or a
+.B pcap_t
+that was created with
+.B pcap_create()
+but that has not yet been activated with
+.BR pcap_activate() ,
+it returns \-1.
 .SH SEE ALSO
-pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP)
+pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP),
+pcap_open_live(3PCAP), pcap_open_offline(3PCAP),
+pcap_fopen_offline(3PCAP), pcap_open_dead(3PCAP)