1ACL_EXTENDED_FD(3)       BSD Library Functions Manual       ACL_EXTENDED_FD(3)
2

NAME

4     acl_extended_fd — test for information in the ACL by file descriptor
5

LIBRARY

7     Linux Access Control Lists library (libacl, -lacl).
8

SYNOPSIS

10     #include <sys/types.h>
11     #include <acl/libacl.h>
12
13     int
14     acl_extended_fd(int fd);
15

DESCRIPTION

17     The acl_extended_fd() function returns 1 if the file identified by the
18     argument fd is associated with an extended access ACL. The function re‐
19     turns 0 if the file does not have an extended access ACL.
20
21     An extended ACL is an ACL that contains entries other than the three re‐
22     quired entries of tag types ACL_USER_OBJ, ACL_GROUP_OBJ and ACL_OTHER.
23     If the result of the acl_extended_fd() function for a file object is 0,
24     then the ACL defines no discretionary access rights other than those al‐
25     ready defined by the traditional file permission bits.
26
27     Access to the file object may be further restricted by other mechanisms,
28     such as Mandatory Access Control schemes. The access(2) system call can
29     be used to check whether a given type of access to a file object would be
30     granted.
31

RETURN VALUE

33     If successful, the acl_extended_fd() function returns 1 if the file ob‐
34     ject identified by fd has an extended access ACL, and 0 if the file ob‐
35     ject identified by fd does not have an extended access ACL. Otherwise,
36     the value -1 is returned and the global variable errno is set to indicate
37     the error.
38

ERRORS

40     If any of the following conditions occur, the acl_extended_fd() function
41     returns -1 and sets errno to the corresponding value:
42
43     [EBADF]            The fd argument is not a valid file descriptor.
44
45     [ENOTSUP]          The file system on which the file identified by fd is
46                        located does not support ACLs, or ACLs are disabled.
47

STANDARDS

49     This is a non-portable, Linux specific extension to the ACL manipulation
50     functions defined in IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned).
51

SEE ALSO

53     access(2), acl_get_fd(3), acl(5)
54

AUTHOR

56     Written by Andreas Gruenbacher <andreas.gruenbacher@gmail.com>.
57
58Linux ACL                       March 23, 2002                       Linux ACL
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