Add mlockall(2)/munlockall(2).
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thorpej
parent
ad528dfdf0
commit
694cc23026
@ -1,5 +1,5 @@
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# $NetBSD: shlib_version,v 1.69 1999/04/17 21:16:45 ws Exp $
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# $NetBSD: shlib_version,v 1.70 1999/06/15 23:31:19 thorpej Exp $
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# Remember to update distrib/sets/lists/base/shl.* when changing
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#
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major=12
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minor=41
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minor=42
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@ -1,4 +1,4 @@
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# $NetBSD: Makefile.inc,v 1.91 1999/03/22 17:56:42 sommerfe Exp $
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# $NetBSD: Makefile.inc,v 1.92 1999/06/15 23:31:19 thorpej Exp $
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# @(#)Makefile.inc 8.3 (Berkeley) 10/24/94
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# sys sources
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@ -43,8 +43,8 @@ ASM= accept.o access.o acct.o adjtime.o bind.o chdir.o chflags.o \
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lchmod.o lchown.o __lstat13.o lfs_bmapv.o lfs_markv.o \
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lfs_segclean.o lfs_segwait.o link.o listen.o lutimes.o \
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madvise.o mincore.o minherit.o mkdir.o mkfifo.o mknod.o \
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mlock.o mount.o mprotect.o msgctl.o msgget.o msgrcv.o \
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msgsnd.o __msync13.o munlock.o munmap.o nanosleep.o \
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mlock.o mlockall.o mount.o mprotect.o msgctl.o msgget.o msgrcv.o \
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msgsnd.o __msync13.o munlock.o munlockall.o munmap.o nanosleep.o \
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nfssvc.o ntp_adjtime.o ntp_gettime.o open.o pathconf.o \
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poll.o profil.o quotactl.o read.o \
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readlink.o readv.o reboot.o recvfrom.o recvmsg.o rename.o revoke.o \
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@ -178,7 +178,7 @@ MAN+= accept.2 access.2 acct.2 adjtime.2 bind.2 brk.2 chdir.2 \
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getpriority.2 getrlimit.2 getrusage.2 getsid.2 getsockname.2 \
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getsockopt.2 gettimeofday.2 getuid.2 intro.2 ioctl.2 kill.2 \
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ktrace.2 link.2 listen.2 lseek.2 mkdir.2 mkfifo.2 mknod.2 \
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madvise.2 mincore.2 minherit.2 mlock.2 mmap.2 mount.2 \
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madvise.2 mincore.2 minherit.2 mlock.2 mlockall.2 mmap.2 mount.2 \
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mprotect.2 msgctl.2 msgget.2 msgrcv.2 msgsnd.2 msync.2 \
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munmap.2 nanosleep.2 nfssvc.2 open.2 pathconf.2 pipe.2 \
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poll.2 profil.2 ptrace.2 quotactl.2 read.2 readlink.2 \
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@ -213,6 +213,7 @@ MLINKS+=intro.2 errno.2
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MLINKS+=ktrace.2 fktrace.2
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MLINKS+=lseek.2 seek.2
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MLINKS+=mlock.2 munlock.2
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MLINKS+=mlockall.2 munlockall.2
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MLINKS+=mount.2 unmount.2
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MLINKS+=pathconf.2 fpathconf.2
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MLINKS+=read.2 readv.2 read.2 pread.2 read.2 preadv.2
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130
lib/libc/sys/mlockall.2
Normal file
130
lib/libc/sys/mlockall.2
Normal file
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.\" $NetBSD: mlockall.2,v 1.1 1999/06/15 23:31:19 thorpej Exp $
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.\"
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.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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.\" NASA Ames Research Center.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd June 12, 1999
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.Dt MLOCKALL 2
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.Os
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.Sh NAME
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.Nm mlockall ,
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.Nm munlockall
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.Nd lock (unlock) the address space of a process
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <sys/mman.h>
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.Ft int
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.Fn mlockall "int flags"
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.Ft int
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.Fn munlockall "void"
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.Sh DESCRIPTION
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The
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.Nm mlockall
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system call locks into memory the physical pages associated with the
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address space of a process until the address space is unlocked, the
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process exits, or execs another program image.
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.Pp
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The following flags affect the behavior of
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.Nm mlockall :
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.Bl -tag -width MCL_CURRENT
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.It Dv MCL_CURRENT
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Lock all pages currently mapped into the process's address space.
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.It Dv MCL_FUTURE
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Lock all pages mapped into the process's address space in the future,
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at the time the mapping is established. Note that this may cause
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future mappings to fail if those mappings cause resource limits to
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be exceeded.
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.El
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.Pp
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Since physical memory is a potentially scarce resource, processes are
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limited in how much they can lock down.
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A single process can lock the minimum of a system-wide
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.Dq wired pages
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limit and the per-process
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.Li RLIMIT_MEMLOCK
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resource limit.
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.Pp
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The
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.Nm munlockall
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call unlocks any locked memory regions in the process address space.
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Any regions mapped after an
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.Nm munlockall
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call will not be locked.
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.Sh RETURN VALUES
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A return value of 0 indicates that the call
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succeeded and all pages in the range have either been locked or unlocked.
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A return value of -1 indicates an error occurred and the locked
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status of all pages in the range remains unchanged.
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In this case, the global location
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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.Fn mlockall
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will fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The
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.Ar flags
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argument is zero, or includes unimplemented flags.
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.It Bq Er ENOMEM
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Locking the indicated range would exceed either the system or per-process
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limit for locked memory.
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.It Bq Er EAGAIN
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Some or all of the memory mapped into the process's address space
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could not be locked when the call was made.
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.It Bq Er EPERM
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The calling process does not have the appropriate privilege to perform
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the requested operation.
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.El
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.Sh SEE ALSO
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.Xr mincore 2 ,
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.Xr mlock 2 ,
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.Xr mmap 2 ,
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.Xr munmap 2 ,
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.Xr setrlimit 2
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.Sh BUGS
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The per-process resource limit is a limit on the amount of virtual
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memory locked, while the system-wide limit is for the number of locked
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physical pages.
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Hence a process with two distinct locked mappings of the same physical page
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counts as 2 pages against the per-process limit and as only a single page
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in the system limit.
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.Sh HISTORY
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The
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.Fn mlockall
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and
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.Fn munlockall
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functions first appeared in
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.Nx 1.5 .
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