diff options
Diffstat (limited to 'lib/libc/sys')
| -rw-r--r-- | lib/libc/sys/Makefile.inc | 9 | ||||
| -rw-r--r-- | lib/libc/sys/mlockall.2 | 139 |
2 files changed, 144 insertions, 4 deletions
diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc index e3d9bbfb0d6..fc229c9ba6e 100644 --- a/lib/libc/sys/Makefile.inc +++ b/lib/libc/sys/Makefile.inc @@ -1,4 +1,4 @@ -# $OpenBSD: Makefile.inc,v 1.41 2001/01/10 17:39:43 deraadt Exp $ +# $OpenBSD: Makefile.inc,v 1.42 2001/03/09 15:13:48 art Exp $ # $NetBSD: Makefile.inc,v 1.35 1995/10/16 23:49:07 jtc Exp $ # @(#)Makefile.inc 8.1 (Berkeley) 6/17/93 @@ -45,9 +45,9 @@ ASM= accept.o access.o acct.o adjtime.o bind.o chdir.o chflags.o chmod.o \ ioctl.o kill.o kevent.o kqueue.o \ ktrace.o lchown.o lfs_bmapv.o lfs_markv.o lfs_segclean.o lfs_segwait.o \ link.o listen.o lstat.o madvise.o mincore.o minherit.o mkdir.o \ - mkfifo.o mknod.o mlock.o \ + mkfifo.o mknod.o mlock.o mlockall.o \ mount.o mprotect.o msgctl.o msgget.o msgrcv.o msgsnd.o msync.o \ - munlock.o munmap.o nanosleep.o nfssvc.o \ + munlock.o munlockall.o munmap.o nanosleep.o nfssvc.o \ ntp_gettime.o ntp_adjtime.o \ open.o pathconf.o pipe.o poll.o profil.o quotactl.o \ read.o readlink.o readv.o reboot.o recvfrom.o recvmsg.o rename.o \ @@ -174,7 +174,7 @@ MAN+= accept.2 access.2 acct.2 adjtime.2 bind.2 brk.2 chdir.2 chflags.2 \ getsockopt.2 gettimeofday.2 getuid.2 intro.2 issetugid.2 ioctl.2 \ kill.2 kqueue.2 ktrace.2 link.2 \ listen.2 lseek.2 mkdir.2 mkfifo.2 mknod.2 madvise.2 mincore.2 \ - minherit.2 mlock.2 \ + minherit.2 mlock.2 mlockall.2 \ mmap.2 mount.2 mprotect.2 msync.2 munmap.2 nanosleep.2 \ nfssvc.2 open.2 pathconf.2 \ pipe.2 profil.2 poll.2 ptrace.2 quotactl.2 read.2 readlink.2 reboot.2 \ @@ -216,6 +216,7 @@ MLINKS+=getuid.2 geteuid.2 MLINKS+=kqueue.2 kevent.2 MLINKS+=intro.2 errno.2 MLINKS+=mlock.2 munlock.2 +MLINKS+=mlockall.2 munlockall.2 MLINKS+=mount.2 unmount.2 MLINKS+=pathconf.2 fpathconf.2 MLINKS+=read.2 readv.2 read.2 pread.2 read.2 preadv.2 diff --git a/lib/libc/sys/mlockall.2 b/lib/libc/sys/mlockall.2 new file mode 100644 index 00000000000..83100e163e6 --- /dev/null +++ b/lib/libc/sys/mlockall.2 @@ -0,0 +1,139 @@ +.\" $NetBSD: mlockall.2,v 1.6 2000/06/26 17:00:02 kleink Exp $ +.\" +.\" Copyright (c) 1999 The NetBSD Foundation, Inc. +.\" All rights reserved. +.\" +.\" This code is derived from software contributed to The NetBSD Foundation +.\" by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, +.\" NASA Ames Research Center. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the NetBSD +.\" Foundation, Inc. and its contributors. +.\" 4. Neither the name of The NetBSD Foundation nor the names of its +.\" contributors may be used to endorse or promote products derived +.\" from this software without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS +.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED +.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS +.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN +.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +.\" POSSIBILITY OF SUCH DAMAGE. +.\" +.Dd June 12, 1999 +.Dt MLOCKALL 2 +.Os +.Sh NAME +.Nm mlockall , +.Nm munlockall +.Nd lock (unlock) the address space of a process +.Sh LIBRARY +.Lb libc +.Sh SYNOPSIS +.Fd #include <sys/types.h> +.Fd #include <sys/mman.h> +.Ft int +.Fn mlockall "int flags" +.Ft int +.Fn munlockall "void" +.Sh DESCRIPTION +The +.Nm mlockall +system call locks into memory the physical pages associated with the +address space of a process until the address space is unlocked, the +process exits, or execs another program image. +.Pp +The following flags affect the behavior of +.Nm mlockall : +.Bl -tag -width MCL_CURRENT +.It Dv MCL_CURRENT +Lock all pages currently mapped into the process's address space. +.It Dv MCL_FUTURE +Lock all pages mapped into the process's address space in the future, +at the time the mapping is established. Note that this may cause +future mappings to fail if those mappings cause resource limits to +be exceeded. +.El +.Pp +Since physical memory is a potentially scarce resource, processes are +limited in how much they can lock down. +A single process can lock the minimum of a system-wide +.Dq wired pages +limit and the per-process +.Li RLIMIT_MEMLOCK +resource limit. +.Pp +The +.Nm munlockall +call unlocks any locked memory regions in the process address space. +Any regions mapped after an +.Nm munlockall +call will not be locked. +.Sh RETURN VALUES +A return value of 0 indicates that the call +succeeded and all pages in the range have either been locked or unlocked. +A return value of -1 indicates an error occurred and the locked +status of all pages in the range remains unchanged. +In this case, the global location +.Va errno +is set to indicate the error. +.Sh ERRORS +.Fn mlockall +will fail if: +.Bl -tag -width Er +.It Bq Er EINVAL +The +.Ar flags +argument is zero, or includes unimplemented flags. +.It Bq Er ENOMEM +Locking the indicated range would exceed either the system or per-process +limit for locked memory. +.It Bq Er EAGAIN +Some or all of the memory mapped into the process's address space +could not be locked when the call was made. +.It Bq Er EPERM +The calling process does not have the appropriate privilege to perform +the requested operation. +.El +.Sh SEE ALSO +.Xr mincore 2 , +.Xr mlock 2 , +.Xr mmap 2 , +.Xr munmap 2 , +.Xr setrlimit 2 +.Sh STANDARDS +The +.Fn mlockall +and +.Fn munlockall +functions conform to +.St -p1003.1b-93 . +.Sh HISTORY +The +.Fn mlockall +and +.Fn munlockall +functions first appeared in +.Ox 2.9 . +.Sh BUGS +The per-process resource limit is a limit on the amount of virtual +memory locked, while the system-wide limit is for the number of locked +physical pages. +Hence a process with two distinct locked mappings of the same physical page +counts as 2 pages against the per-process limit and as only a single page +in the system limit. |