mlockall(3C)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | USAGE | ATTRIBUTES | SUMMARY OF TRUSTED SOLARIS CHANGES | SEE ALSO

NAME

mlockall, munlockall- Lock or unlock address space

SYNOPSIS

#include <sys/mman.h>

int mlockall(int flags);
int munlockall(void);

DESCRIPTION

The mlockall() function locks in memory all pages mapped by an address space.

The value of flags determines whether the pages to be locked are those currently mapped by the address space, those that will be mapped in the future, or both:

---

       
MCL_CURRENT  Lock current mappings
       MCL_FUTURE   Lock future mappings

---

If MCL_FUTURE is specified for mlockall(), mappings are locked as they are added to the address space (or replace existing mappings), provided sufficient memory is available. Locking in this manner is not persistent across the exec family of functions (see exec(2)).

Mappings locked using mlockall() with any option may be explicitly unlocked with a munlock() call (see mlock(3C)).

The munlockall() function removes address space locks and locks on mappings in the address space.

All conditions and constraints on the use of locked memory that apply to mlock(3C) also apply to mlockall().

Locks established with mlockall() are not inherited by a child process after a fork(2) call, and are not nested.

RETURN VALUES

mlockall() and munlockall() return:

0

On success.

-1

On failure, and set errno to indicate the error.

ERRORS

The mlockall() and munlockall() functions will fail if:

EAGAIN

Some or all of the memory in the address space could not be locked due to sufficient resources. This error condition applies to mlockall() only.

EINVAL

The flags argument contains values other than MCL_CURRENT and MCL_FUTURE.

EPERM

The process does not have sufficient privilege.

USAGE

The mlockall() and munlockall() functions require PRIV_SYS_CONFIG in their set of effective privileges.

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
MT-Level	MT-Safe

SUMMARY OF TRUSTED SOLARIS CHANGES

To succeed, the mlockall() and munlockall() functions require PRIV_SYS_CONFIG in their set of effective privileges.

SEE ALSO

Trusted Solaris 8 4/01 Reference Manual

exec(2), fork(2), plock(3C), mlock(3C)

SunOS 5.8 Reference Manual

memcntl(2), mmap(2), sysconf(3C), attributes(5)

SunOS 5.8  Last Revised 18 Apr 1997

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | USAGE | ATTRIBUTES | SUMMARY OF TRUSTED SOLARIS CHANGES | SEE ALSO