minix/lib/libc/string/strmode.3
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
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
2012-02-14 14:52:02 +01:00

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5.3 KiB
Groff

.\" Copyright (c) 1990, 1991, 1993
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" from: @(#)strmode.3 8.3 (Berkeley) 7/28/94
.\" $NetBSD: strmode.3,v 1.17 2006/10/16 08:48:45 wiz Exp $
.\"
.Dd July 28, 1994
.Dt STRMODE 3
.Os
.Sh NAME
.Nm strmode
.Nd convert inode status information into a symbolic string
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In unistd.h
.Ft void
.Fn strmode "mode_t mode" "char *bp"
.Sh DESCRIPTION
The
.Fn strmode
function
converts a file
.Fa mode
(the type and permission information associated with an inode, see
.Xr stat 2 )
into a symbolic string which is stored in the location referenced by
.Fa bp .
This stored string is eleven characters in length plus a trailing nul byte.
.Pp
The first character is the inode type, and will be one of the following:
.Pp
.Bl -tag -width flag -offset indent -compact
.It \-
regular file
.It a
regular file in archive state 1
.It A
regular file in archive state 2
.It b
block special
.It c
character special
.It d
directory
.It l
symbolic link
.It p
fifo
.It s
socket
.It w
whiteout
.It ?
unknown inode type
.El
.Pp
The next nine characters encode three sets of permissions, in three
characters each.
The first three characters are the permissions for the owner of the
file, the second three for the group the file belongs to, and the
third for the ``other'', or default, set of users.
.Pp
Permission checking is done as specifically as possible.
If read permission is denied to the owner of a file in the first set
of permissions, the owner of the file will not be able to read the file.
This is true even if the owner is in the file's group and the group
permissions allow reading or the ``other'' permissions allow reading.
.Pp
If the first character of the three character set is an ``r'', the file is
readable for that set of users; if a dash ``\-'', it is not readable.
.Pp
If the second character of the three character set is a ``w'', the file is
writable for that set of users; if a dash ``\-'', it is not writable.
.Pp
The third character is the first of the following characters that apply:
.Bl -tag -width xxxx
.It S
If the character is part of the owner permissions and the file is not
executable or the directory is not searchable by the owner, and the
set-user-id bit is set.
.It S
If the character is part of the group permissions and the file is not
executable or the directory is not searchable by the group, and the
set-group-id bit is set.
.It T
If the character is part of the other permissions and the file is not
executable or the directory is not searchable by others, and the ``sticky''
.Pq Dv S_ISVTX
bit is set.
.It s
If the character is part of the owner permissions and the file is
executable or the directory searchable by the owner, and the set-user-id
bit is set.
.It s
If the character is part of the group permissions and the file is
executable or the directory searchable by the group, and the set-group-id
bit is set.
.It t
If the character is part of the other permissions and the file is
executable or the directory searchable by others, and the ``sticky''
.Pq Dv S_ISVTX
bit is set.
.It x
The file is executable or the directory is searchable.
.It \-
None of the above apply.
.El
.Pp
The last character is a plus sign ``+'' if there are any alternative
or additional access control methods associated with the inode, otherwise
it will be a space.
.Pp
Archive state 1 and archive state 2 represent file system dependent
archive state for a file.
Most file systems do not retain file archive
state, and so will not report files in either archive state.
msdosfs will report a file in archive state 1 if it has been
archived more recently than modified.
Hierarchical storage systems may have multiple archive states for a
file and may define archive states 1 and 2 as appropriate.
.Sh SEE ALSO
.Xr chmod 1 ,
.Xr find 1 ,
.Xr stat 2 ,
.Xr getmode 3 ,
.Xr setmode 3
.Sh HISTORY
The
.Fn strmode
function first appeared in
.Bx 4.4 .