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Standard pipes on Unix are only one-way, but we can create a pair of filehandles that look like just a pipe, but one that can flow in both directions. Perl provides a number of functions to create and manage sockets, which are bidirectional networking endpoints represented in our applications as filehandles. They can be used to communicate between different processes and different systems across a network, and a large part of 22 is concerned with them. Here, however, we are interested in their use for local interprocess communications. The socketpair function stands apart from the other socket functions because it does not have any application in networking applications. Instead, it creates two sockets connected back to back, with the output of each connected to the input of the other. The result is what looks and feels like a bidirectional pipe. (Unfortunately, Windows programmers are out of luck here the concept is not valid on these platforms.) Sockets have domains, types, and protocols associated with them. The domain in Perl can be either the Internet or Unix, the type a streaming socket, datagram socket, or raw socket, and the protocol can be something like PF_INET or PF_UNIX (these constants actually stand for Protocol Families). This is the general form of socketpair being used to create a parent and child filehandle: socketpair PARENT, CHILD, $domain, $type, $protocol;

However, most of this is fairly irrelevant to socketpair; its sockets do not talk to network interfaces or the file system, they do not need to listen for connections, they cannot be bound to addresses, and finally they are not bothered about protocols, since they have no lower-level protocol API to satisfy. Consequently, we generally use a Unix domain socket, since they are more lightweight than an Internet domain socket. We make it streaming so we can use it like an ordinary filehandle, and not bother with the protocol at all. The actual use of socketpair is thus almost always use Socket; socketpair PARENT, CHILD, AF_UNIX, SOCK_STREAM, PF_UNSPEC; Here is a version of the message passing program we showed earlier using a pair of sockets rather than two pairs of pipe handles: #!/usr/bin/perl # socketpair.pl use warnings; use strict; use Socket; socketpair PARENT, CHILD, AF_Unix, SOCK_STREAM, PF_UNSPEC; my $message = "S"; if (fork) { syswrite PARENT, "$message \n"; while (<PARENT>) { chomp; print "Parent got: $_ \n"; syswrite PARENT, "P$_ \n"; sleep 1; } } else { while (<CHILD>) { chomp; print "Child got : $_ \n"; syswrite CHILD, "C$_ \n"; } } In fact, we could also close the parent and child socket handles in the child and parent processes respectively, since we do not need them we only needed one end of each pipe. We can also use the socket in only one direction by using the shutdown function to close either the input or the output: shutdown CHILD, 1; shutdown PARENT, 0; # make child read-only # make parent write-only

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The difference between close and shutdown is that close only affects the filehandle itself; the underlying socket is not affected unless the filehandle just closed was the only one pointing to it. In other words, shutdown includes the socket itself, and hence all filehandles associated with it are affected. This program is a lot more advanced in the way that it manufactures the conduit between the two processes, because it uses Perl s socket support to create the filehandles, but the benefit is that it makes the application simpler to write and generates fewer redundant filehandles.

Listing 30-5 is an example of the transfer.TransferFactory CFC. Listing 30-5. transfer.TransferFactory CFC application.transferFactory = createObject("component", "transfer.TransferFactory").init( "/tblog/resources/xml/datasource.xml", "/tblog/resources/xml/transfer.xml", "/tblog/definitions"); The TransferFactory CFC has two public methods that allow interaction with Transfer: getDatasource() and getTransfer(). getDatasource(), shown in Listing 30-6, simply returns a CFC with the properties of the configured ColdFusion data source from the data source configuration file. This CFC is useful for custom SQL that is not generated by Transfer, and therefore needs the data source details for the cfquery to run properly. Listing 30-6. getDatasource() method datasource = application.transferFactory.getDatasource(); <cfquery name="qPosts" datasource="#datasource.getName()#" username="#datasource.getUsername()#" password="# datasource.getUsername()#"> <!--- query here ---> </cfquery> On line 2 of Listing 30-6, the Datasource CFC provides the information to execute a cfquery tag. The getTransfer() returns the transfer.com.Transfer CFC. This CFC is the primary gateway to the main functionality of Transfer, and it is covered in the following sections.

One problem with using open to start an external process is that if the external command contains spaces or other such characters that are significant to a shell, open will run a shell as a subprocess and pass on the command for it to interpret, so that any special characters can be correctly parsed The problem with this is that it is potentially insecure if the program is to be run by untrusted users, and it will fail if taint mode is enabled through the -T option, as, for example, is the case with a CGI script Functions such as exec and system allow us to separate the parameters of a command into separate scalar values and supply them as a list, avoiding the shell Unfortunately, open does not directly allow us to pass in a command as a list.

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