diff options
Diffstat (limited to 'pcap_get_selectable_fd.3pcap')
| -rw-r--r-- | pcap_get_selectable_fd.3pcap | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/pcap_get_selectable_fd.3pcap b/pcap_get_selectable_fd.3pcap index 6ae06a1bc429..86b0c2683fa3 100644 --- a/pcap_get_selectable_fd.3pcap +++ b/pcap_get_selectable_fd.3pcap @@ -17,7 +17,7 @@ .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. .\" -.TH PCAP_GET_SELECTABLE_FD 3PCAP "22 July 2011" +.TH PCAP_GET_SELECTABLE_FD 3PCAP "18 October 2014" .SH NAME pcap_get_selectable_fd \- get a file descriptor on which a select() can be done for a live capture @@ -36,9 +36,9 @@ int pcap_get_selectable_fd(pcap_t *p); returns, on UNIX, a file descriptor number for a file descriptor on which one can do a -.B select() -or -.B poll() +.BR select() , +.BR poll() , +or other such call to wait for it to be possible to read packets without blocking, if such a descriptor exists, or \-1, if no such descriptor exists. Some network devices opened with @@ -54,6 +54,12 @@ or (for example, regular network devices on FreeBSD 4.3 and 4.4, and Endace DAG devices), so \-1 is returned for those devices. .PP +Note that a descriptor on which a read can be done without blocking may, +on some platforms, not have any packets to read if the read timeout has +expired. A call to +.B pcap_dispatch() +will return 0 in this case, but will not block. +.PP Note that in: .IP FreeBSD prior to FreeBSD 4.6; |