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+.\" Hey Emacs! This file is -*- nroff -*- source.
+.\"
+.\" Copyright (C) Markus Kuhn, 1996
+.\"
+.\" This is free documentation; you can redistribute it and/or
+.\" modify it under the terms of the GNU General Public License as
+.\" published by the Free Software Foundation; either version 2 of
+.\" the License, or (at your option) any later version.
+.\"
+.\" The GNU General Public License's references to "object code"
+.\" and "executables" are to be interpreted as the output of any
+.\" document formatting or typesetting system, including
+.\" intermediate and printed output.
+.\"
+.\" This manual is distributed in the hope that it will be useful,
+.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
+.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+.\" GNU General Public License for more details.
+.\"
+.\" You should have received a copy of the GNU General Public
+.\" License along with this manual; if not, write to the Free
+.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
+.\" USA.
+.\"
+.\" 1995-11-26  Markus Kuhn <mskuhn@cip.informatik.uni-erlangen.de>
+.\"      First version written
+.\" Modified, 27 May 2004, Michael Kerrisk <mtk16@ext.canterbury.ac.nz>
+.\"     Added notes on capability requirements
+.\"
+.TH MUNLOCKALL 2 2004-05-27 "Linux 2.6.6" "Linux Programmer's Manual"
+.SH NAME
+munlockall \- reenable paging for calling process
+.SH SYNOPSIS
+.nf
+.B #include <sys/mman.h>
+.sp
+\fBint munlockall(void);
+.fi
+.SH DESCRIPTION
+.B munlockall
+reenables paging for all pages mapped into the address space of the
+calling process.
+
+Memory locks do not stack, i.e., pages which have been locked several times
+by calls to
+.B mlock
+or
+.B mlockall
+will be unlocked by a single call to
+.BR munlockall .
+Pages which are mapped to several locations or by several processes stay
+locked into RAM as long as they are locked at least at one location or by
+at least one process.
+
+On POSIX systems on which
+.B mlockall
+and
+.B munlockall
+are available,
+.B _POSIX_MEMLOCK
+is defined in
+.I <unistd.h> .
+.SH "RETURN VALUE"
+On success,
+.B munlockall
+returns zero.  On error, \-1 is returned and
+.I errno
+is set appropriately.
+.SH ERRORS
+.TP
+.B EPERM
+The calling process has insufficient privilege to call 
+.BR munlockall .
+Under Linux the
+.B CAP_IPC_LOCK
+capability is required.
+.\" Weirdness this way comes: CAP_IPC_LOCK is required for munlockall()
+.\" and shmctl(SHM_UNLOCK), but is *not* required for munlock 
+.\" (as at kernel 2.6.6)
+.SH "CONFORMING TO"
+POSIX.1b, SVr4
+.SH "SEE ALSO"
+.BR mlock (2),
+.BR mlockall (2),
+.BR munlock (2),
+.BR capabilities (7)