Languages
FsharpActionScript
xBase
Clean
GPSS
PureBasic
Sieve
Erlang
JOVIAL
Mercury
Linda
DataFlex
PostScript
FoxPro2
VFP
Cobol
Prolog
Jython
Awk
VisualBasic
JavaScript
Matlab
ASP
Haskell
Csharp
D
Smalltalk
Nemerle
Pixilang
Java
SQL
Python
ObjectPascal
Ruby
Perl
Pascal
Assembler
PHP
C
| Functions | Add function | Users Registration | Enter | About | ASCII Table | Our helpers |
getsockopt in Perl |
|
getsockopt SOCKET,LEVEL,OPTNAME
Queries the option named OPTNAME associated with SOCKET at a given LEVEL. Options may exist at multiple protocol levels depending on the socket type, but at least the uppermost socket level SOL_SOCKET (defined in the Socket module) will exist. To query options at another level the protocol number of the appropriate protocol controlling the option should be supplied. For example, to indicate that an option is to be interpreted by the TCP protocol, LEVEL should be set to the protocol number of TCP, which you can get using getprotobyname. The call returns a packed string representing the requested socket option, or undef if there is an error (the error reason will be in $!). What exactly is in the packed string depends in the LEVEL and OPTNAME, consult your system documentation for details. A very common case however is that the option is an integer, in which case the result will be a packed integer which you can decode using unpack with the i (or I) format. An example testing if Nagle's algorithm is turned on on a socket: use Socket qw(:all); defined(my $tcp = getprotobyname("tcp")) or die "Could not determine the protocol number for tcp"; # my $tcp = IPPROTO_TCP; # Alternative my $packed = getsockopt($socket, $tcp, TCP_NODELAY) or die "Could not query TCP_NODELAY socket option: $!"; my $nodelay = unpack("I", $packed); print "Nagle's algorithm is turned ", $nodelay ? "off\n" : "on\n"; Add by Pancho You can edit it here |
| Adding comments is available only for registered users. |
| Birth of a Hurricane
Summer storms are a regular feature in the North Atlantic, and while most pose little threat to our shores, a choice few become devastating hurricanes. To decipher which storms could bring danger, and which will not, atmospheric scientists are heading to the tropics to observe these systems as they form and dissipate--or develop into hurricanes. By learning to identify which weather systems are the most critical to track, the efforts may ultimately allow for earlier hurricane ...
|
PycckaR
BepcuR
Articles
Library
Downloads
