2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
150 lines
4.1 KiB
Groff
150 lines
4.1 KiB
Groff
.\" $NetBSD: setmode.3,v 1.21 2009/01/11 02:46:27 christos Exp $
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.\"
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.\" 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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.\"
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.Dd January 4, 2009
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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 void *
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.Fn setmode "const char *mode_str"
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.Ft mode_t
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.Fn getmode "const void *set" "mode_t mode"
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.Sh DESCRIPTION
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The
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.Fn setmode
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function accepts a string representation of a file mode change,
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compiles it to binary form, and returns an abstract representation
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that may be passed to
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.Fn getmode .
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The string may be an numeric (octal) or symbolic string of the form
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accepted by
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.Xr chmod 1 ,
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and may represent either an exact mode to set or a change to make to
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the existing mode.
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.Pp
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The
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.Fn getmode
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function
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adjusts the file permission bits given by
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.Fa mode
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according to the compiled change representation
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.Fa set ,
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and returns the adjusted mode.
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While only the permission bits are altered, other parts of the file
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mode, particularly the type, may be examined.
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.Pp
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Because some of the possible symbolic values are defined relative to
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the file 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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temporarily changing the mask.
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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 to recompile the mode string 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,
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.Fn setmode
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returns
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.Dv NULL .
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.Sh EXAMPLES
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The effects of the shell command
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.Ql "chmod a+x myscript.sh"
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can be duplicated as follows:
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.Bd -literal -offset indent
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const char *file = "myscript.sh";
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struct stat st;
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mode_t newmode;
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stat(file, \*[Am]st);
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newmode = getmode(setmode("a+x"), st.st_mode);
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chmod(file, newmode);
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.Ed
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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
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.Va errno
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for any of the errors specified for the library routines
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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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.Sh BUGS
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Each call to
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.Nm setmode
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allocates a small amount of memory that there is no correct way to
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free.
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.Pp
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The type of
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.Fa set
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should really be some opaque struct type used only by these functions
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rather than
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.Ft void * .
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