7e6cabd06e
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
128 lines
3.4 KiB
Groff
128 lines
3.4 KiB
Groff
.\" Copyright (c) 1989, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)setmode.3 8.2 (Berkeley) 4/28/95
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.\" $FreeBSD$
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.\"
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.Dd February 22, 2015
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.Dt SETMODE 3
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.Os
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.Sh NAME
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.Nm getmode ,
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.Nm setmode
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.Nd modify mode bits
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.Ft mode_t
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.Fn getmode "const void *set" "mode_t mode"
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.Ft void *
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.Fn setmode "const char *mode_str"
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.Sh DESCRIPTION
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The
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.Fn getmode
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function
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returns a copy of the file permission bits
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.Fa mode
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as altered by the values pointed to by
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.Fa set .
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While only the mode bits are altered, other parts of the file mode
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may be examined.
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.Pp
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The
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.Fn setmode
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function
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takes an absolute (octal) or symbolic value, as described in
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.Xr chmod 1 ,
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as an argument
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and returns a pointer to mode values to be supplied to
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.Fn getmode .
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Because some of the symbolic values are relative to the file
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creation mask,
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.Fn setmode
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may call
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.Xr umask 2 .
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If this occurs, the file creation mask will be restored before
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.Fn setmode
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returns.
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If the calling program changes the value of its file creation mask
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after calling
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.Fn setmode ,
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.Fn setmode
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must be called again if
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.Fn getmode
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is to modify future file modes correctly.
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.Pp
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If the mode passed to
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.Fn setmode
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is invalid or if memory cannot be allocated for the return value,
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.Fn setmode
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returns
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.Dv NULL .
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.Pp
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The value returned from
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.Fn setmode
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is obtained from
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.Fn malloc
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and should be returned to the system with
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.Fn free
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when the program is done with it, generally after a call to
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.Fn getmode .
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.Sh ERRORS
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The
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.Fn setmode
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function
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may fail and set errno for any of the errors specified for the library
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routine
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.Xr malloc 3
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or
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.Xr strtol 3 .
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In addition,
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.Fn setmode
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will fail and set
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.Va errno
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to:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The
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.Fa mode
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argument does not represent a valid mode.
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.El
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.Sh SEE ALSO
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.Xr chmod 1 ,
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.Xr stat 2 ,
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.Xr umask 2 ,
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.Xr malloc 3
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.Sh HISTORY
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The
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.Fn getmode
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and
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.Fn setmode
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functions first appeared in
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.Bx 4.4 .
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