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Perl: The Complete Reference
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13; see also IO::Handle, IO::Socket, Socket
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This module is an object-oriented interface to the System V message system
use IPC::Msg;
It provides an alternative interface to the msg* range of IPC message queue functions The new method creates a new message queue
new KEY, FLAGS
creates a new message queue associated with KEY using FLAGS as the permissions for accessing the queue You will need to import suitable constants from IPC::SysV A new object is created only under the following conditions: I KEY is equal to IPC_PRIVATE I KEY does not already have a message queue associated with it I FLAGS contains the IPC_CREAT constant Once created, the following methods are supported:
returns the system message queue identifier
rcv BUF, LEN [, TYPE [, FLAGS]])
receives a message from the queue into the variable BUF, up to a maximum length LEN
remove
removes (destroys) the message queue from the system
Appendix B:
Standard Perl Library
set STAT set(NAME => VALUE [, NAME => VALUE])
sets the values using either an IPC::Msg::stat object or the specified hash Supported elements are uid, gid, mode, and qbytes
sends a message to the queue of TYPE
stat
returns an IPC::Msg::stat object that is a subclass of the Class::Struct class The object consists of the following fields: uid lspid gid lrpid cuid stime cgid rtime mode ctime qnum qbytes
References
14; see also Class::Struct, IPC::SysV
IPC::Open2
This module allows you to open a piped process for both reading and writing
use IPC::Open2; $pid = open2(READER, WRITER, LIST);
The open2 function supports the functionality not provided in the built-in open function to allow you to open a command for both reading and writing The READER and WRITER arguments should be references to existing filehandles to be used for reading from and writing to the piped command The function does not create the filehandles for you The LIST is one or more arguments defining the command to be run For example:
$pid = open2(\*READ, \*WRITE, '|bc|');
APPENDIXES
The returned value is the process ID of the child process executed Errors are raised by an exception matching /^open2:/ You should probably use this within an eval block
Perl: The Complete Reference
If READER is a string and it begins with ">&", then the child will send output directly to that filehandle If WRITER is a string that begins with "<&", then WRITER will be closed in the parent, and the child process will read from the filehandle directly In both cases, the filehandle is duplicated with dup() instead of pipe() The function assumes you know how to read from and write to the child process while preventing deadlocking Commands that use a fixed input or output length (specified in a number of characters or lines) should prevent the problem
References
s 8, 14, 15; see also IPC::Open3
IPC::Open3
This module is similar to IPC::Open2, but it opens a command for reading, writing, and error handling
use IPC::Open3; $pid = open3(WRITER, READER, ERROR, LIST);
The WRITER, READER, and ERROR should be references to existing filehandles to be used for standard input, standard output, and standard error from the command and arguments supplied in LIST Note that the order of the READER and WRITER arguments is different from that in open2 If " is given as the argument for ERROR, then ERROR and READER use the same filehandle All other details are identical to the open2 call, including the warning on deadlocking
References
s 8, 14 ,15; see also IPC::Open2
IPC::Semaphore
This module is an object class definition for System V semaphore based IPC
use IPC::Semaphore;
It provides an object interface to the System V semaphore system used for interprocess communication The new method creates a new IPC::Semaphore object:
$sem = new IPC::Semaphore(KEY, NSEMS, FLAGS);
Appendix B:
Standard Perl Library
Creates a new semaphore set associated with KEY, with NSEMS semaphores in the set The value of FLAGS is a list of permissions for the new semaphore set You will need to import suitable constants from the IPC::SysV module A new semaphore is created only under the following conditions: I KEY is equal to IPC_PRIVATE I KEY does not already have a semaphore identifier associated with it I FLAGS contains the IPC_CREAT constant Once created, the new object supports the following methods:
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