Perl Cheat Sheet Page 22
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31msgget 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 or GETALL then
ARG
must be a variable.
semget KEY, NSEMS, SIZE, FLAGS
Creates a set of semaphores for
. Returns the message semaphore
KEY
identifier.
...
semop KEY,
Performs semaphore operations.
shmctl ID, CMD, ARG
Calls shmctl(2). If
is IPC_STAT then
must be a single variable.
CMD
ARG
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
.
25. Miscellaneous
y
defined EXPR
Tests whether the
EXPR
has an actual value.
do FILENAME
Executes
as a Perl script. See also
in section
FILENAME
require
‘Subroutines, packages and modules’.
[
]
dump
LABEL
Immediate core dump. When reincarnated, starts at
.
LABEL
. . . }
eval
{
EXPR;
Executes the code between { and } . Traps run-time errors as described with
eval(EXPR)
, section ‘String functions’.
local VAR
Creates a scope for
local to the enclosing block, subroutine or
.
VAR
eval
my VAR
Creates a scope for the variable lexically local to the enclosing block,
subroutine or
eval
.
y
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.
is a list of single letters.
EXPR
All variables and arrays beginning with one of those letters are reset to their
pristine state. Only affects the current package.
22
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