plock - lock or unlock into memory process, text, or data
int plock(int op);
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:
Lock text and data segments into memory (process
Lock text segment into memory (text lock).
Lock data segment into memory (data lock).
Upon successful completion, 0 is returned. Otherwise, -1 is
returned and errno is set to indicate the error.
The plock() function fails and does not perform the
requested operation if:
Not enough memory.
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 argu-
ment is equal to UNLOCK and no lock exists on the cal-
EPERM The effective user of the calling process is not
The mlock(3C) and mlockall(3C) functions are the preferred
interfaces for process locking.
See attributes(5) for descriptions of the following attri-
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| MT-Level | MT-Safe |
exec(2), exit(2), fork(2), memcntl(2), mlock(3C),
Man(1) output converted with