05-25-2007
7 More Discussions You Might Find Interesting
1. Solaris
Hello everybody.
I've got a problem installing libssh2-0.18
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./configure --prefix=/home/tdallagn/modap/libssh2 --with-openssl=/home/tdallagn/modap/openssl
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ld: fatal: relocations remain against allocatable but... (0 Replies)
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2. UNIX for Dummies Questions & Answers
Hi All,
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------- ----- --------- --- ------------------ ---------- ---- -- ----- --- ---
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3. Red Hat
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Hi all,
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5. Shell Programming and Scripting
Hi
My directory structure is as below.
dir1, dir2, dir3
I have the list of files to be deleted in the below path as below.
/staging/retain_for_2years/Cleanup/log $ ls -lrt
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drwxr-xr-x 2 root ... (2 Replies)
Discussion started by: prasadn
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6. Programming
Could you tell me the possibilities of the reason to get the Mismatched free() / delete / delete .
I unable to see the line no in the valgrind report. it displays the function name. with that function name, I am not able to find where exactly the issue is there.I am getting the Mismatched free()... (3 Replies)
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7. UNIX for Advanced & Expert Users
rsync with --delete won't honor the delete if the source is something/*. I want the delete to work, but not to delete directories on the target that are peer to the intended directory. For example, using these source and target file structures:
Source on desktop:
~/
Money/
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Discussion started by: JavaMeister
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LEARN ABOUT CENTOS
pcap_get_selectable_fd
PCAP_GET_SELECTABLE_FD(3PCAP) PCAP_GET_SELECTABLE_FD(3PCAP)
NAME
pcap_get_selectable_fd - get a file descriptor on which a select() can be done for a live capture
SYNOPSIS
#include <pcap/pcap.h>
int pcap_get_selectable_fd(pcap_t *p);
DESCRIPTION
pcap_get_selectable_fd() returns, on UNIX, a file descriptor number for a file descriptor on which one can do a select() or poll() 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 pcap_create() and pcap_activate(), or with pcap_open_live(), do not support select() or poll() (for example, regular
network devices on FreeBSD 4.3 and 4.4, and Endace DAG devices), so -1 is returned for those devices.
Note that in:
FreeBSD prior to FreeBSD 4.6;
NetBSD prior to NetBSD 3.0;
OpenBSD prior to OpenBSD 2.4;
Mac OS X prior to Mac OS X 10.7;
select() and poll() do not work correctly on BPF devices; pcap_get_selectable_fd() will return a file descriptor on most of those versions
(the exceptions being FreeBSD 4.3 and 4.4), but a simple select() or poll() will not indicate that the descriptor is readable until a full
buffer's worth of packets is received, even if the read timeout expires before then. To work around this, an application that uses
select() or poll() to wait for packets to arrive must put the pcap_t in non-blocking mode, and must arrange that the select() or poll()
have a timeout less than or equal to the read timeout, and must try to read packets after that timeout expires, regardless of whether
select() or poll() indicated that the file descriptor for the pcap_t is ready to be read or not. (That workaround will not work in FreeBSD
4.3 and later; however, in FreeBSD 4.6 and later, select() and poll() work correctly on BPF devices, so the workaround isn't necessary,
although it does no harm.)
Note also that poll() doesn't work on character special files, including BPF devices, in Mac OS X 10.4 and 10.5, so, while select() can be
used on the descriptor returned by pcap_get_selectable_fd(), poll() cannot be used on it those versions of Mac OS X. Kqueues also don't
work on that descriptor. poll(), but not kqueues, work on that descriptor in Mac OS X releases prior to 10.4; poll() and kqueues work on
that descriptor in Mac OS X 10.6 and later.
pcap_get_selectable_fd() is not available on Windows.
RETURN VALUE
A selectable file descriptor is returned if one exists; otherwise, -1 is returned.
SEE ALSO
pcap(3PCAP), select(2), poll(2)
5 April 2008 PCAP_GET_SELECTABLE_FD(3PCAP)