1STRMODE(3)               BSD Library Functions Manual               STRMODE(3)
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
12     void
13     strmode(mode_t mode, char *bp);
14

DESCRIPTION

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

SEE ALSO

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

HISTORY

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