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Perl Language Reference Manual
by Larry Wall and others
Paperback (6"x9"), 724 pages
ISBN 9781906966027
RRP £29.95 ($39.95)

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Sends a message on a socket. Attempts to send the scalar MSG to the SOCKET filehandle. Takes the same flags as the system call of the same name. On unconnected sockets, you must specify a destination to send to, in which case it does a sendto(2) syscall. Returns the number of characters sent, or the undefined value on error. The sendmsg(2) syscall is currently unimplemented. See 20.7 for examples.

Note the characters: depending on the status of the socket, either (8-bit) bytes or characters are sent. 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 , or 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 sent.

ISBN 9781906966027Perl Language Reference ManualSee the print edition