Networking

accept NEWSOCKET, GENERICSOCKET

Accepts a new socket.

bind SOCKET, NAME

Binds the NAME to the SOCKET.

connect SOCKET, NAME

Connects the NAME to the SOCKET.

getpeername SOCKET

Returns the socket address of the other end of the SOCKET.

getsockname SOCKET

Returns the name of the SOCKET.

getsockopt SOCKET, LEVEL, OPTNAME

Returns the socket options.

listen SOCKET, QUEUESIZE

Starts listening on the specified SOCKET.

recv SOCKET, SCALAR, LENGTH, FLAGS

Receives a message on SOCKET.

send SOCKET, MSG, FLAGS [ , TO ]

Sends a message on the SOCKET.

setsockopt SOCKET, LEVEL, OPTNAME, OPTVAL

Sets the requested socket option.

shutdown SOCKET, HOW

Shuts down a SOCKET.

socket SOCKET, DOMAIN, TYPE, PROTOCOL

Creates a SOCKET in DOMAIN with TYPE and PROTOCOL.

socketpair SOCKET1, SOCKET2, DOMAIN, TYPE, PROTOCOL

Works the same as socket, but creates a pair of bidirectional sockets.

System V IPC

You need to require "sys/ipc.ph" before you can use the symbolic names of the operations.

msgctl ID, CMD, ARGS

Calls msgctl(2). If CMD is &IPC_STAT then ARGS must be a variable.

msgget KEY, FLAGS

Creates a message queue for KEY. Returns the message queue identifier.

msgsnd ID, MSG, FLAGS

Sends MSG to queue ID.

msgrcv ID, $VAR, SIZE, TYPE, FLAGS

Receives a message from queue ID into VAR.

semctl ID, SEMNUM, CMD, ARG

Calls semctl(2). If CMD is &IPC_STAT of &GETALL then ARG must be a variable.

semget KEY, NSEMS, SIZE, FLAGS

Creates a set of semaphores for KEY. Returns the message semaphore identifier.

semop KEY, ...

Performs semaphore operations.

shmctl ID, CMD, ARG

Calls shmctl(2). If CMD is &IPC_STAT then ARG must be a variable.

shmget KEY, SIZE, FLAGS

Creates shared memory. Returns the shared memory segment identifier.

shmread ID, $VAR, POS, SIZE

Reads at most SIZE bytes of the contents of shared memory segment ID starting at offset POS into VAR.

shmwrite ID, STRING, POS, SIZE

Writes at most SIZE bytes of STRING into the contents of shared memory segment ID at offset POS.

Miscellaneous

defined EXPR

Tests whether the lvalue EXPR has an actual value.

do FILENAME

Executes FILENAME as a Perl script. See also require in the section Subroutines, Packages and Modules.

dump [ LABEL ]

Immediate core dump. When reincarnated, starts at LABEL.

eval { EXPR ; ... }

Executes the code between { and }. Traps runtime errors as described with eval(EXPR), in the section String Functions.

local VARIABLE

local ( LIST )

Creates a scope for the listed variables local to the enclosing block, subroutine or eval.

my VARIABLE

my ( LIST )

Creates a scope for the listed variables lexically local to the enclosing block, subroutine or eval.

ref EXPR†

Returns a true value if EXPR is a reference. Returns the package name if EXPR has been blessed into a package.

reset [ EXPR ]

Resets ?? searches so that they work again. EXPR is a list of single letters. All variables and arrays beginning with one of those letters are reset to their pristine state. Only affects the current package.

scalar EXPR

Forces evaluation of EXPR in scalar context.

undef [ LVALUE ]

Undefines the LVALUE. Always returns the undefined value.

wantarray

Returns true if the current context expects an array value.