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MLOCK
Section: POSIX Programmer's Manual (3P)
Updated: 2003
Index
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PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
NAME
mlock, munlock - lock or unlock a range of process address space (REALTIME)
SYNOPSIS
#include <sys/mman.h>
int mlock(const void * addr, size_t len);
int munlock(const void *addr, size_t len);
DESCRIPTION
The mlock() function shall cause those whole pages containing
any part of the address space of the process starting at
address addr and continuing for len bytes to be memory-resident
until unlocked or until the process exits or execs another process
image. The implementation may require that addr be a multiple
of
{PAGESIZE}.
The munlock() function shall unlock those whole pages containing
any part of the address space of the process starting at
address addr and continuing for len bytes, regardless
of how many times mlock() has been called by the process
for any of the pages in the specified range. The implementation may
require that addr be a multiple of {PAGESIZE}.
If any of the pages in the range specified to a call to munlock()
are also mapped into the address spaces of other
processes, any locks established on those pages by another process
are unaffected by the call of this process to munlock().
If any of the pages in the range specified by a call to munlock()
are also mapped into other portions of the address space
of the calling process outside the range specified, any locks established
on those pages via the other mappings are also unaffected
by this call.
Upon successful return from mlock(), pages in the specified
range shall be locked and memory-resident. Upon successful
return from munlock(), pages in the specified range shall be
unlocked with respect to the address space of the process.
Memory residency of unlocked pages is unspecified.
The appropriate privilege is required to lock process memory with
mlock().
RETURN VALUE
Upon successful completion, the mlock() and munlock()
functions shall return a value of zero. Otherwise, no change
is made to any locks in the address space of the process, and the
function shall return a value of -1 and set errno to
indicate the error.
ERRORS
The mlock() and munlock() functions shall fail if:
- ENOMEM
-
Some or all of the address range specified by the addr and len
arguments does not correspond to valid mapped
pages in the address space of the process.
The mlock() function shall fail if:
- EAGAIN
-
Some or all of the memory identified by the operation could not be
locked when the call was made.
The mlock() and munlock() functions may fail if:
- EINVAL
-
The addr argument is not a multiple of {PAGESIZE}.
The mlock() function may fail if:
- ENOMEM
-
Locking the pages mapped by the specified range would exceed an implementation-defined
limit on the amount of memory that the
process may lock.
- EPERM
-
The calling process does not have the appropriate privilege to perform
the requested operation.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
exec(), exit(), fork(), mlockall(), munmap(),
the
Base Definitions volume of IEEE Std 1003.1-2001, <sys/mman.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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