1.\" Copyright (c) 1989, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)setmode.3 8.2 (Berkeley) 4/28/95 33.\" $FreeBSD$ 34.\" 35.Dd April 28, 1995 36.Dt SETMODE 3 37.Os 38.Sh NAME 39.Nm getmode , 40.Nm setmode 41.Nd modify mode bits 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.Fd #include <unistd.h> 46.Ft mode_t 47.Fn getmode "const void *set" "mode_t mode" 48.Ft void * 49.Fn setmode "const char *mode_str" 50.Sh DESCRIPTION 51The 52.Fn getmode 53function 54returns a copy of the file permission bits 55.Fa mode 56as altered by the values pointed to by 57.Fa set . 58While only the mode bits are altered, other parts of the file mode 59may be examined. 60.Pp 61The 62.Fn setmode 63function 64takes an absolute (octal) or symbolic value, as described in 65.Xr chmod 1 , 66as an argument 67and returns a pointer to mode values to be supplied to 68.Fn getmode . 69Because some of the symbolic values are relative to the file 70creation mask, 71.Fn setmode 72may call 73.Xr umask 2 . 74If this occurs, the file creation mask will be restored before 75.Fn setmode 76returns. 77If the calling program changes the value of its file creation mask 78after calling 79.Fn setmode , 80.Fn setmode 81must be called again if 82.Fn getmode 83is to modify future file modes correctly. 84.Pp 85If the mode passed to 86.Fn setmode 87is invalid or if memory cannot be allocated for the return value, 88.Fn setmode 89returns 90.Dv NULL . 91.Pp 92The value returned from 93.Fn setmode 94is obtained from 95.Fn malloc 96and should be returned to the system with 97.Fn free 98when the program is done with it, generally after a call to 99.Fn getmode . 100.Sh ERRORS 101The 102.Fn setmode 103function 104may fail and set errno for any of the errors specified for the library 105routine 106.Xr malloc 3 . 107.Sh SEE ALSO 108.Xr chmod 1 , 109.Xr stat 2 , 110.Xr umask 2 , 111.Xr malloc 3 112.Sh HISTORY 113The 114.Fn getmode 115and 116.Fn setmode 117functions first appeared in 118.Bx 4.4 . 119