Receive a message over a Socket

Daftar Isi

• recv SOCKET,SCALAR,LENGTH,FLAGS

  Receives a message on a socket. Attempts to receive LENGTH charactersof data into variable SCALAR from the specified SOCKET filehandle.SCALAR will be grown or shrunk to the length actually read. Takes thesame flags as the system call of the same name. Returns the addressof the sender if SOCKET's protocol supports this; returns an emptystring otherwise. If there's an error, returns the undefined value.This call is actually implemented in terms of recvfrom(2) system call.See UDP: Message Passing in perlipc for examples.

  Note the characters: depending on the status of the socket, either(8-bit) bytes or characters are received. By default all socketsoperate on bytes, but for example if the socket has been changed usingbinmode() to operate with the :encoding(utf8) I/O layer (see theopen pragma, open), the I/O will operate on UTF8-encoded Unicodecharacters, not bytes. Similarly for the :encoding pragma: in thatcase pretty much any characters can be read.