116 lines
3.5 KiB
Groff
116 lines
3.5 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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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.\"
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.Dd April 28, 1995
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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 SYNOPSIS
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.Fd #include <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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.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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