plock(2) [osf1 man page]
plock(2) System Calls Manual plock(2) NAME
plock - Locks a process' text and/or data segments in memory SYNOPSIS
#include <sys/lock.h> int plock( int opr) ; PARAMETERS
Specifies one of the following operations: Locks the text and data segments into memory. Locks the text segment into memory. Locks the data segment into memory. Removes locks. DESCRIPTION
The plock() function locks or unlocks a process' text segments, data segments, or both in physical memory. When locked, the physical pages containing the text or data segment will not be paged out. It is an error to lock a segment that is already locked. The caller must have superuser privilege to use the plock() function. Note that memory acquired subsequent to a plock() function may or may not be locked in memory, depending on the specific acquisition method. Memory acquired using the brk() function (or the sbrk() function) is locked if the data segment was locked. Memory acquired via the mmap() or vm_allocate() functions will not be locked. RETURN VALUES
Upon successful completion, a value of 0 (zero) is returned to the calling process. Otherwise, a value of -1 is returned and errno is set to indicate the error. ERRORS
If the plock() function fails, errno may be set to one of the following values: The caller does not have appropriate privilege. There are insufficient resources to perform the operation. The opr parameter is PROCLOCK, but the text segment or the data segment is already locked. The opr parameter is TXTLOCK, but the text segment is already locked. The opr parameter is DATLOCK, but the data segment is already locked. The opr parameter is UNLOCK, but neither the text segment nor the data segment is locked. RELATED INFORMATION
Functions: brk(2), mmap(2) delim off plock(2)
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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 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 {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) SunOS 5.10 22 Mar 2004 plock(3C)