STRMODE(3)STRMODE(3)NAME
strmode - convert inode status information into a symbolic string
SYNOPSIS
#include <string.h>
void
strmode(mode_t mode, char *bp);
DESCRIPTION
Strmode converts a file mode (the type and permission information asso‐
ciated with an inode, see stat(2)) into a symbolic string which is
stored in the location referenced by bp. This stored string is eleven
characters in length plus a trailing NULL.
The first character is the inode type, and will be one of the follow‐
ing:
- regular file
b block special
c character special
d directory
l symbolic link
p fifo
s socket
? unknown inode type
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.
Permission checking is done as specifically as possible. If read per‐
mission is denied to the owner of a file in the first set of perms‐
sions, 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 permis‐
sions allow reading or the ``other'' permissions allow reading.
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.
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.
The third character is the first of the following characters that
apply:
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.
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.
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'' (S_ISVTX) bit is set.
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.
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.
t If the character is part of the other permissions and the file
is executable or the directory searchable, by others, and the
``sticky'' (S_ISVTX) bit is set.
x The file is executable or the directory is searchable.
- None of the above apply.
The last character is a plus sign ``+'' if any there are any alternate
or additional access control methods associated with the inode, other‐
wise it will be a space.
RETURN VALUE
Strmode always returns 0.
SEE ALSOchmod(1), find(1), stat(2), getmode(3), setmode(3)4.4 Berkeley Distribution May 10, 1990 STRMODE(3)