Content-type: text/html Man page of plock

plock

Section: Standard C Library Functions (3C)
Updated: 22 Mar 2004
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NAME

plock - lock or unlock into memory process, text, or data  

SYNOPSIS

#include <sys/lock.h>

int plock(int op);  

DESCRIPTION

The plock() function allows the calling process to lock or unlock into memory its text segment (text lock), its data segment (data lock), or both its text and data segments (process lock). Locked segments are immune to all routine swapping. The effective user ID of the calling process must be super-user to use this call.

The plock() function performs the function specified by op:

PROCLOCK Lock text and data segments into memory (process lock).

TXTLOCK Lock text segment into memory (text lock).

DATLOCK Lock data segment into memory (data lock).

UNLOCK Remove locks.

 

RETURN VALUES

Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error.  

ERRORS

The plock() function fails and does not perform the requested operation if:

EAGAIN Not enough memory.

EINVAL The op argument is equal to PROCLOCK and a process lock, a text lock, or a data lock already exists on the calling process; the op argument is equal to TXTLOCK and a text lock or a process lock already exists on the calling process; the op argument is equal to DATLOCK and a data lock or a process lock already exists on the calling process; or the op argument is equal to UNLOCK and no lock exists on the calling process.

EPERM The {PRIV_PROC_LOCK_MEMORY} privilege is not asserted in the effective set of the calling process.

 

USAGE

The mlock(3C) and mlockall(3C) functions are the preferred interfaces for process locking.  

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelMT-Safe

 

SEE ALSO

exec(2), exit(2), fork(2), memcntl(2), mlock(3C), mlockall(3C), attributes(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
USAGE
ATTRIBUTES
SEE ALSO

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Time: 02:37:25 GMT, October 02, 2010