154 lines
5.1 KiB
Groff
154 lines
5.1 KiB
Groff
.\" Copyright (c) 1990, 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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.\" @(#)strmode.3 8.3 (Berkeley) 7/28/94
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.\" $FreeBSD$
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.\"
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.Dd July 28, 1994
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.Dt STRMODE 3
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.Os
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.Sh NAME
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.Nm strmode
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.Nd convert inode status information into a symbolic string
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <string.h>
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.Ft void
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.Fn strmode "mode_t mode" "char *bp"
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.Sh DESCRIPTION
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The
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.Fn strmode
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function
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converts a file
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.Fa mode
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(the type and permission information associated with an inode, see
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.Xr stat 2 )
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into a symbolic string which is stored in the location referenced by
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.Fa bp .
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This stored string is eleven characters in length plus a trailing
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.Dv NUL .
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.Pp
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The first character is the inode type, and will be one of the following:
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.Pp
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.Bl -tag -width flag -offset indent -compact
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.It \-
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regular file
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.It b
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block special
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.It c
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character special
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.It d
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directory
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.It l
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symbolic link
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.It p
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fifo
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.It s
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socket
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.It w
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whiteout
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.It ?
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unknown inode type
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.El
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.Pp
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The next nine characters encode three sets of permissions, in three
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characters each.
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The first three characters are the permissions for the owner of the
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file, the second three for the group the file belongs to, and the
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third for the ``other'', or default, set of users.
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.Pp
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Permission checking is done as specifically as possible.
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If read permission is denied to the owner of a file in the first set
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of permissions, the owner of the file will not be able to read the file.
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This is true even if the owner is in the file's group and the group
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permissions allow reading or the ``other'' permissions allow reading.
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.Pp
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If the first character of the three character set is an ``r'', the file is
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readable for that set of users; if a dash ``\-'', it is not readable.
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.Pp
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If the second character of the three character set is a ``w'', the file is
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writable for that set of users; if a dash ``\-'', it is not writable.
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.Pp
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The third character is the first of the following characters that apply:
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.Bl -tag -width xxxx
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.It S
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If the character is part of the owner permissions and the file is not
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executable or the directory is not searchable by the owner, and the
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set-user-id bit is set.
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.It S
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If the character is part of the group permissions and the file is not
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executable or the directory is not searchable by the group, and the
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set-group-id bit is set.
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.It T
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If the character is part of the other permissions and the file is not
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executable or the directory is not searchable by others, and the ``sticky''
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.Pq Dv S_ISVTX
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bit is set.
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.It s
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If the character is part of the owner permissions and the file is
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executable or the directory searchable by the owner, and the set-user-id
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bit is set.
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.It s
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If the character is part of the group permissions and the file is
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executable or the directory searchable by the group, and the set-group-id
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bit is set.
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.It t
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If the character is part of the other permissions and the file is
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executable or the directory searchable by others, and the ``sticky''
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.Pq Dv S_ISVTX
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bit is set.
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.It x
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The file is executable or the directory is searchable.
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.It \-
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None of the above apply.
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.El
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.Pp
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The last character is a plus sign ``+'' if any there are any alternate
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or additional access control methods associated with the inode, otherwise
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it will be a space.
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.Sh RETURN VALUES
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The
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.Fn strmode
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function
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always returns 0.
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.Sh SEE ALSO
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.Xr chmod 1 ,
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.Xr find 1 ,
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.Xr stat 2 ,
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.Xr getmode 3 ,
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.Xr setmode 3
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.Sh HISTORY
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The
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.Fn strmode
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function first appeared in
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.Bx 4.4 .
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