plock(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SUMMARY OF TRUSTED SOLARIS CHANGES | USAGE | SEE ALSO

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 calling process must have the PRIV_SYS_CONFIG privilege to succeed.

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

plock() returns:

0

On success.

-1

On failure, and sets errno 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 process does not have sufficient privilege.

SUMMARY OF TRUSTED SOLARIS CHANGES

To succeed, plock() must have PRIV_SYS_CONFIG in its set of effective privileges.

USAGE

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

SEE ALSO

Trusted Solaris 7 Reference Manual

exec(2), fork(2), mlock(3C), mlockall(3C)

SunOS 5.7 Reference Manual

exit(2), memcntl(2)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SUMMARY OF TRUSTED SOLARIS CHANGES | USAGE | SEE ALSO