|Perl Language Reference Manual|
by Larry Wall and others
Paperback (6"x9"), 724 pages
RRP £29.95 ($39.95)
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Receives a message on a socket. Attempts to receive LENGTH characters of data into variable SCALAR from the specified SOCKET filehandle. SCALAR will be grown or shrunk to the length actually read. Takes the same flags as the system call of the same name. Returns the address of the sender if SOCKET's protocol supports this; returns an empty string otherwise. If there's an error, returns the undefined value. This call is actually implemented in terms of recvfrom(2) system call. See 20.7 for examples.
Note the characters: depending on the status of the socket, either
(8-bit) bytes or characters are received. By default all sockets
operate on bytes, but for example if the socket has been changed using
binmode() to operate with the
:encoding(utf8) I/O layer (see the
open pragma, "Perl pragma to set default PerlIO layers for input and output" (open) in the Perl Library Reference Manual (Volume 1)), the I/O will operate on UTF-8 encoded Unicode
characters, not bytes. Similarly for the
:encoding pragma: in that
case pretty much any characters can be read.
|ISBN 9781906966027||Perl Language Reference Manual||See the print edition|