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here are times when what you need to do is communicate with the host operating system This can be done at a number of different levels, but there are two core elements that Perl provides built-in support for The first is the user and group system employed by Unix The user and group functions are built into Perl, and this is just one of the places where Perl shows its Unix heritage The other, more practical, set of functions relates to getting the current time from the system and converting that time into a format that can be used effectively Once you ve got the information, you ll probably want to play with it too, so I ve also included information on how to manipulate time values Finally, we ll also take this opportunity to look at the generic environment variables available to Perl, how they affect Perl s operation, as well as information on how to determine the information by other means

The effective user ID (uid) of the current process This is the user ID of the current process and defines what directories and features are available The real group ID (gid) of the current process contains a space-separated list of the groups you are currently in if your machine supports multiple group membership Note that the information is listed in group IDs, not names The effective group ID (gid) of the current process contains a space-separated list of the groups you are currently in if your machine supports multiple group membership Note that the information is listed in group IDs, not names

Table 11-1

37 Given:

The real user ID (uid) of the current process This is the user ID of the user who executed the process, even if running setuid

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Then, once the files are open and ready for access, you need to create the necessary bitsets for use with the select function Since we re only reading from a pipe, we really only need to create the RBITS bitset, but this example shows creation of all three for clarity:

$rbits = $wbits = $ebits = ''; vec($rbits, fileno(DATA), 1) = 1; vec($wbits, fileno(DATA), 1) = 1; $ebits = $rbits | $wbits;

3 public class Fortran { 4 static int bump(int i) { return i + 2; } 5 public static void main(String[] args) { 6 for(int x = 0; x < 5; bump(x)) 7 Systemoutprint(x + " "); 8 } }

You re now ready to start checking the status of the filehandles you want to monitor Typically of course you d do this in a loop as part of the main execution process, but for this example, we ll simply check the status once:

$nfound = select($rreq = $rbits, $wreq = $wbits, $ereq = $ebits, 0); print "$nfound filehandle(s) waiting for input\n"; print "Expecting input from 'ls' command\n" if ($rreq && fileno(DATA));

If you put the preceding example together, and assuming there are no problems opening the ls command or setting non-blocking on the filehandle, you should get a result like this:

What is the result A 2 4 B 0 2 4 C 2 4 6 D 0 2 4 6 E Compilation fails F Some other result occurs 38 You need the three classes and/or interfaces to work together to produce the output "Kara Charis" Fill in the blanks using the following fragments so the correct is-a and has-a relationships are established to produce this output Note: You may not need to fill in every empty blank space, but a blank space can hold only one fragment Also note that not all the fragments will be used, and that fragments CAN be used more than once Code to complete:

The select function has a much easier to use module, IO::Select, which makes it much easier to manage multiple select file sets See 12, where we ll be looking at the use of this function for handling multiple network sockets

Using files in a single script environment does not often cause any sort of file access problems But if you want to access a file that may be in use by another process (or another invocation of the same script), you need to support file locking By locking a file, you can prevent it from being updated by another process at the same time you are using it Furthermore, it can be used to stop other processes even reading from the file, allowing you to update a file before it needs to be read by another process

When locking DBM databases, there is no built-in method for locking in the generic ODBM/NDBM/SDBM implementations In these situations you must use flock or something similar If you can use GDBM or Berkeley DB, these provide built-in file locking capabilities as part of the implementation See 13 for more information The main method for locking within Perl is the flock function

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