plock - lock process, text, or data segment in memory

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SYNOPSIS

#include <sys/lock.h>

int plock(op)
int op;

DESCRIPTION

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

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

plock() returns:

0

on success.

-1

on failure and sets errno to indicate the error.

ERRORS

EAGAIN

Not enough memory.

EINVAL

op is equal to PROCLOCK and a process lock, a text lock, or a data lock already exists on the calling process.

op is equal to TXTLOCK and a text lock, or a process lock already exists on the calling process.

op is equal to DATLOCK and a data lock, or a process lock already exists on the calling process.

op is equal to UNLOCK and no type of lock exists on the calling process.

EPERM

The effective user ID of the calling process is not super-user.

SEE ALSO

Created by unroff & hp-tools. © somebody (See intro for details). All Rights Reserved. Last modified 11/5/97