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+'\" et
+.TH MLOCK "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+
+.SH NAME
+mlock,
+munlock
+\(em lock or unlock a range of process address space
+(\fBREALTIME\fP)
+.SH SYNOPSIS
+.LP
+.nf
+#include <sys/mman.h>
+.P
+int mlock(const void *\fIaddr\fP, size_t \fIlen\fP);
+int munlock(const void *\fIaddr\fP, size_t \fIlen\fP);
+.fi
+.SH DESCRIPTION
+The
+\fImlock\fR()
+function shall cause those whole pages containing any part of the
+address space of the process starting at address
+.IR addr
+and continuing for
+.IR len
+bytes to be memory-resident until unlocked or until the process exits
+or
+.IR exec s
+another process image. The implementation may require that
+.IR addr
+be a multiple of
+{PAGESIZE}.
+.P
+The
+\fImunlock\fR()
+function shall unlock those whole pages containing any part of the
+address space of the process starting at address
+.IR addr
+and continuing for
+.IR len
+bytes, regardless of how many times
+\fImlock\fR()
+has been called by the process for any of the pages in the specified
+range. The implementation may require that
+.IR addr
+be a multiple of
+{PAGESIZE}.
+.P
+If any of the pages in the range specified to a call to
+\fImunlock\fR()
+are also mapped into the address spaces of other processes, any locks
+established on those pages by another process are unaffected by the
+call of this process to
+\fImunlock\fR().
+If any of the pages in the range specified by a call to
+\fImunlock\fR()
+are also mapped into other portions of the address space of the calling
+process outside the range specified, any locks established on those
+pages via the other mappings are also unaffected by this call.
+.P
+Upon successful return from
+\fImlock\fR(),
+pages in the specified range shall be locked and memory-resident. Upon
+successful return from
+\fImunlock\fR(),
+pages in the specified range shall be unlocked with respect to the
+address space of the process. Memory residency of unlocked pages is
+unspecified.
+.P
+Appropriate privileges are required to lock process memory with
+\fImlock\fR().
+.SH "RETURN VALUE"
+Upon successful completion, the
+\fImlock\fR()
+and
+\fImunlock\fR()
+functions shall return a value of zero. Otherwise, no change is made to
+any locks in the address space of the process, and the function shall
+return a value of \(mi1 and set
+.IR errno
+to indicate the error.
+.SH ERRORS
+The
+\fImlock\fR()
+and
+\fImunlock\fR()
+functions shall fail if:
+.TP
+.BR ENOMEM
+Some or all of the address range specified by the
+.IR addr
+and
+.IR len
+arguments does not correspond to valid mapped pages in the address
+space of the process.
+.P
+The
+\fImlock\fR()
+function shall fail if:
+.TP
+.BR EAGAIN
+Some or all of the memory identified by the operation could not be
+locked when the call was made.
+.P
+The
+\fImlock\fR()
+and
+\fImunlock\fR()
+functions may fail if:
+.TP
+.BR EINVAL
+The
+.IR addr
+argument is not a multiple of
+{PAGESIZE}.
+.P
+The
+\fImlock\fR()
+function may fail if:
+.TP
+.BR ENOMEM
+Locking the pages mapped by the specified range would exceed an
+implementation-defined limit on the amount of memory that the process
+may lock.
+.TP
+.BR EPERM
+The calling process does not have appropriate privileges to perform
+the requested operation.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIexec\fR\^",
+.IR "\fIexit\fR\^(\|)",
+.IR "\fIfork\fR\^(\|)",
+.IR "\fImlockall\fR\^(\|)",
+.IR "\fImunmap\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2008,
+.IR "\fB<sys_mman.h>\fP"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, Copyright (C) 2013 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.unix.org/online.html .
+
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .