1*2fe8fb19SBen Gras.\" $NetBSD: umask.2,v 1.16 2003/08/07 16:44:10 agc Exp $ 2*2fe8fb19SBen Gras.\" 3*2fe8fb19SBen Gras.\" Copyright (c) 1980, 1991, 1993 4*2fe8fb19SBen Gras.\" The Regents of the University of California. All rights reserved. 5*2fe8fb19SBen Gras.\" 6*2fe8fb19SBen Gras.\" Redistribution and use in source and binary forms, with or without 7*2fe8fb19SBen Gras.\" modification, are permitted provided that the following conditions 8*2fe8fb19SBen Gras.\" are met: 9*2fe8fb19SBen Gras.\" 1. Redistributions of source code must retain the above copyright 10*2fe8fb19SBen Gras.\" notice, this list of conditions and the following disclaimer. 11*2fe8fb19SBen Gras.\" 2. Redistributions in binary form must reproduce the above copyright 12*2fe8fb19SBen Gras.\" notice, this list of conditions and the following disclaimer in the 13*2fe8fb19SBen Gras.\" documentation and/or other materials provided with the distribution. 14*2fe8fb19SBen Gras.\" 3. Neither the name of the University nor the names of its contributors 15*2fe8fb19SBen Gras.\" may be used to endorse or promote products derived from this software 16*2fe8fb19SBen Gras.\" without specific prior written permission. 17*2fe8fb19SBen Gras.\" 18*2fe8fb19SBen Gras.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19*2fe8fb19SBen Gras.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20*2fe8fb19SBen Gras.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21*2fe8fb19SBen Gras.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22*2fe8fb19SBen Gras.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23*2fe8fb19SBen Gras.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24*2fe8fb19SBen Gras.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25*2fe8fb19SBen Gras.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26*2fe8fb19SBen Gras.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27*2fe8fb19SBen Gras.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28*2fe8fb19SBen Gras.\" SUCH DAMAGE. 29*2fe8fb19SBen Gras.\" 30*2fe8fb19SBen Gras.\" @(#)umask.2 8.1 (Berkeley) 6/4/93 31*2fe8fb19SBen Gras.\" 32*2fe8fb19SBen Gras.Dd June 4, 1993 33*2fe8fb19SBen Gras.Dt UMASK 2 34*2fe8fb19SBen Gras.Os 35*2fe8fb19SBen Gras.Sh NAME 36*2fe8fb19SBen Gras.Nm umask 37*2fe8fb19SBen Gras.Nd set file creation mode mask 38*2fe8fb19SBen Gras.Sh LIBRARY 39*2fe8fb19SBen Gras.Lb libc 40*2fe8fb19SBen Gras.Sh SYNOPSIS 41*2fe8fb19SBen Gras.In sys/stat.h 42*2fe8fb19SBen Gras.Ft mode_t 43*2fe8fb19SBen Gras.Fn umask "mode_t numask" 44*2fe8fb19SBen Gras.Sh DESCRIPTION 45*2fe8fb19SBen GrasThe 46*2fe8fb19SBen Gras.Fn umask 47*2fe8fb19SBen Grasroutine sets the process's file mode creation mask to 48*2fe8fb19SBen Gras.Fa numask 49*2fe8fb19SBen Grasand returns the previous value of the mask. 50*2fe8fb19SBen GrasThe 9 low-order access permission bits of 51*2fe8fb19SBen Gras.Fa numask 52*2fe8fb19SBen Grasare used by system calls, including 53*2fe8fb19SBen Gras.Xr open 2 , 54*2fe8fb19SBen Gras.Xr mkdir 2 , 55*2fe8fb19SBen Gras.Xr mkfifo 2 56*2fe8fb19SBen Grasand 57*2fe8fb19SBen Gras.Xr mknod 2 58*2fe8fb19SBen Grasto turn off corresponding bits 59*2fe8fb19SBen Grasrequested in file mode. 60*2fe8fb19SBen Gras(See 61*2fe8fb19SBen Gras.Xr chmod 2 ) . 62*2fe8fb19SBen GrasThis clearing allows each user to restrict the default access 63*2fe8fb19SBen Grasto his files. 64*2fe8fb19SBen Gras.Pp 65*2fe8fb19SBen GrasThe default mask value is S_IWGRP|S_IWOTH (022, write access for the 66*2fe8fb19SBen Grasowner only). 67*2fe8fb19SBen GrasChild processes inherit the mask of the calling process. 68*2fe8fb19SBen Gras.Sh RETURN VALUES 69*2fe8fb19SBen GrasThe previous value of the file mode mask is returned by the call. 70*2fe8fb19SBen Gras.Sh ERRORS 71*2fe8fb19SBen GrasThe 72*2fe8fb19SBen Gras.Fn umask 73*2fe8fb19SBen Grasfunction is always successful. 74*2fe8fb19SBen Gras.Sh SEE ALSO 75*2fe8fb19SBen Gras.Xr chmod 2 , 76*2fe8fb19SBen Gras.Xr mkdir 2 , 77*2fe8fb19SBen Gras.Xr mkfifo 2 , 78*2fe8fb19SBen Gras.Xr mknod 2 , 79*2fe8fb19SBen Gras.Xr open 2 80*2fe8fb19SBen Gras.Sh STANDARDS 81*2fe8fb19SBen GrasThe 82*2fe8fb19SBen Gras.Fn umask 83*2fe8fb19SBen Grasfunction conforms to 84*2fe8fb19SBen Gras.St -p1003.1-90 . 85