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 effective user of the calling process is not super-user. |
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:
SEE ALSO
exec(2), exit(2), fork(2), memcntl(2), mlock(3C), mlockall(3C), attributes(5)