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STRMODE(3)

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NAME    [Toc]    [Back]

     strmode - convert inode status information into  a  symbolic
string

SYNOPSIS    [Toc]    [Back]

     #include <string.h>

     void
     strmode(mode_t mode, char *bp);

DESCRIPTION    [Toc]    [Back]

     The  strmode()  function  converts a file mode (the type and
permission information
 associated 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 byte.

     The first character is the inode type, and will  be  one  of
the following:

           -     regular file
           b     block special
           c     character special
           d     directory
           l     symbolic link
           p     FIFO
           s     socket
           w     whiteout
           ?     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 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.

     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 setuser-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 setgroup-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 there are any alternate or additional
  access  control methods associated with the inode,
otherwise it
     will be a space.

RETURN VALUES    [Toc]    [Back]

     The strmode() function always returns 0.

SEE ALSO    [Toc]    [Back]

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

HISTORY    [Toc]    [Back]

     The strmode() function first appeared in 4.4BSD.

OpenBSD     3.6                           July      28,      1994
[ Back ]
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