1strmode(3bsd)                        LOCAL                       strmode(3bsd)
2

NAME

4     strmode — convert inode status information into a symbolic string
5

LIBRARY

7     Utility functions from BSD systems (libbsd, -lbsd)
8

SYNOPSIS

10     #include <string.h>
11     (See libbsd(7) for include usage.)
12
13     void
14     strmode(mode_t mode, char *bp);
15

DESCRIPTION

17     The strmode() function converts a file mode (the type and permission in‐
18     formation associated with an inode, see stat(2)) into a symbolic string
19     which is stored in the location referenced by bp.  This stored string is
20     eleven characters in length plus a trailing NUL.
21
22     The first character is the inode type, and will be one of the following:
23
24           -     regular file
25           b     block special
26           c     character special
27           d     directory
28           l     symbolic link
29           p     fifo
30           s     socket
31           w     whiteout
32           ?     unknown inode type
33
34     The next nine characters encode three sets of permissions, in three char‐
35     acters each.  The first three characters are the permissions for the
36     owner of the file, the second three for the group the file belongs to,
37     and the third for the ``other'', or default, set of users.
38
39     Permission checking is done as specifically as possible.  If read permis‐
40     sion is denied to the owner of a file in the first set of permissions,
41     the owner of the file will not be able to read the file.  This is true
42     even if the owner is in the file's group and the group permissions allow
43     reading or the ``other'' permissions allow reading.
44
45     If the first character of the three character set is an ``r'', the file
46     is readable for that set of users; if a dash ``-'', it is not readable.
47
48     If the second character of the three character set is a ``w'', the file
49     is writable for that set of users; if a dash ``-'', it is not writable.
50
51     The third character is the first of the following characters that apply:
52
53     S     If the character is part of the owner permissions and the file is
54           not executable or the directory is not searchable by the owner, and
55           the set-user-id bit is set.
56
57     S     If the character is part of the group permissions and the file is
58           not executable or the directory is not searchable by the group, and
59           the set-group-id bit is set.
60
61     T     If the character is part of the other permissions and the file is
62           not executable or the directory is not searchable by others, and
63           the ``sticky'' (S_ISVTX) bit is set.
64
65     s     If the character is part of the owner permissions and the file is
66           executable or the directory searchable by the owner, and the set-
67           user-id bit is set.
68
69     s     If the character is part of the group permissions and the file is
70           executable or the directory searchable by the group, and the set-
71           group-id bit is set.
72
73     t     If the character is part of the other permissions and the file is
74           executable or the directory searchable by others, and the
75           ``sticky'' (S_ISVTX) bit is set.
76
77     x     The file is executable or the directory is searchable.
78
79     -     None of the above apply.
80
81     The last character is a plus sign ``+'' if any there are any alternate or
82     additional access control methods associated with the inode, otherwise it
83     will be a space.
84

SEE ALSO

86     chmod(1), find(1), stat(2), getmode(3bsd), setmode(3bsd)
87

HISTORY

89     The strmode() function first appeared in 4.4BSD.
90
91BSD                              July 28, 1994                             BSD
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