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plock(3c)
Standard C Library Functions plock(3C)
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 {PRIV_PROC_LOCK_MEMORY} privilege
must be asserted in the effective set of the calling process 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 argu‐
ment 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(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ MT-LevelMT-Safe
SEE ALSO
exec(2), exit(2), fork(2), memcntl(2), mlock(3C), mlockall(3C),
attributes(7), privileges(7)
Oracle Solaris 11.4 3 Nov 2021 plock(3C)