plock man page on SmartOS

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PLOCK(3C)							     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 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	 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(5) for descriptions of the following attributes:

       ┌───────────────┬─────────────────┐
       │ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
       ├───────────────┼─────────────────┤
       │MT-Level       │ MT-Safe	 │
       └───────────────┴─────────────────┘

SEE ALSO
       exec(2),	 exit(2),  fork(2),   memcntl(2),   mlock(3C),	 mlockall(3C),
       attributes(5)

				 Mar 22, 2004			     PLOCK(3C)
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