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Both open2 and open3 perform a fork-and-exec behind the scenes, in the same way that a forked open does The return value is the process ID of the child that actually executed (with exec) the external command In the event that establishing the pipes to the external command fails, both subroutines raise a SIGPIPE signal, which we must catch or ignore (this we have covered earlier on in the chapter) Neither subroutine is concerned with the well being of the actual external command, however, so if the child aborts or exits normally, we need to check for ourselves and clean up with waitpid: use POSIX qw(WNOHANG); my $pid = open2($in, $out, 'command', @arguments); until (waitpid $pid, WNOHANG) { # do other stuff, and/or read/writes to $in & $out } Note that this particular scheme assumes we are using nonblocking reads and writes; otherwise, the waitpid may not get called.

We can also check for a deceased external process by detecting the EOF condition on the input or error filehandles (or by returning nothing from a sysread), but we still need to use waitpid to clean up the child process If we do not want to do anything else in the meantime, perhaps because we have another child process busy doing things elsewhere, we can simply say # wait for child process to finish waitpid $pid, 0; If the write filehandle is prefixed with >&, then the external command is connected directly to the supplied filehandle, so input that arrives on it is sent directly to the external command The filehandle is also closed in our own process Similarly, if <& is given to the read or error filehandles, they are connected directly to the application Here s a script that illustrates this in action: # Usage: myscript.

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pl 'somecommand @args' use IPC::Open3; print "Now entering $ARGV[0] \n"; my $pid = open3('>&STDIN', '<&STDOUT', '<&STDERR', @ARGV); waitpid $pid, 0; print "$ARGV[0] finished \n"; Note that we use standard input for the writing handle and standard output for the reading handle That s because this script is a middleman in the transaction; input comes in from standard input but then goes out to the external command, and vice versa for standard output With a little embellishment, this script could be made useful, for example, logging uses of various commands, checking arguments, or processing tainted data We do not have to redirect all three filehandles, only the ones we don t want to deal with: sub open2likeopen3 { return open3(shift, shift, '>&STDERR', @_); } This implements a subroutine functionally identical to open2 (unless we already have redirected standard error, that is) but with the arguments in the same order as open3..

category); len = ArrayLen(categories); for(counter = 1; counter lte len; counter = counter + 1) { category = transferget("systemCategory", categories[counter]); postaddCategory(category); } transferupdate(post); In Listing 30-11, when calling the update() method with the Post as the argument, Transfer will update column values of the tbl_Post table with the values from the Post TransferObject Transfer will also update the values of the ManyToMany table in Listing 30-2 with the primary key stored in the Post TransferObject and the primary key stored in the categories added to the Post in Listing 30-11 While these are specific methods for explicitly inserting or updating data within the database, Transfer also provides a save() method that automatically determines whether the create() or update() method is necessary This will depend on whether the TransferObject has been persisted in the database.

Some external commands will communicate with us on a line-by-line basis. That is, whenever we send them something, we can expect at least one line in response. In these cases, we can alternate

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