diff options
Diffstat (limited to 'pcap_setnonblock.3pcap')
| -rw-r--r-- | pcap_setnonblock.3pcap | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/pcap_setnonblock.3pcap b/pcap_setnonblock.3pcap index a38ca0d7..65cfea28 100644 --- a/pcap_setnonblock.3pcap +++ b/pcap_setnonblock.3pcap @@ -47,8 +47,9 @@ If there is an error, .B PCAP_ERROR is returned and .I errbuf -is filled in with an appropriate error message; otherwise, 0 is -returned. +is filled in with an appropriate error message; otherwise, +.B 0 +is returned. .PP In ``non-blocking'' mode, an attempt to read from the capture descriptor @@ -56,7 +57,8 @@ with .BR pcap_dispatch (3PCAP) and .BR pcap_next_ex (3PCAP) -will, if no packets are currently available to be read, return 0 +will, if no packets are currently available to be read, return +.B 0 immediately rather than blocking waiting for packets to arrive. .PP .BR pcap_loop (3PCAP) @@ -65,7 +67,9 @@ available; .BR pacp_dispatch () should be used instead. .BR pcap_next (3PCAP) -will return NULL if there are no packets currently available to read; +will return +.B NULL +if there are no packets currently available to read; this is indistinguishable from an error, so .BR pcap_next_ex () should be used instead. @@ -80,7 +84,9 @@ is required in order to put it into ``non-blocking'' mode. .SH RETURN VALUE .BR pcap_getnonblock () returns the current ``non-blocking'' state of the capture descriptor; it -always returns 0 on ``savefiles''. +always returns +.B 0 +on ``savefiles''. If there is an error, .B PCAP_ERROR is returned and |