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


SYNOPSIS

     acl_t
     acl_get_fd(int fd)


DESCRIPTION

     The acl_get_fd() function retrieves the access ACL associated with the
     file referred to by fd. The ACL is placed into working storage and
     acl_get_fd() returns a pointer to that storage.

     In order to read an ACL from an object, a process must have read access
     to the object's attributes.

     This function may cause memory to be allocated.  The caller should free
     any releasable memory, when the new ACL is no longer required, by calling
     acl_free(3) with the (void*)acl_t returned by acl_get_fd() as an argu­
     ment.


RETURN VALUE

     Upon successful completion, this function shall return a pointer to the
     working storage.  Otherwise, a value of (acl_t)NULL shall be returned,
     and errno shall be set to indicate the error.


ERRORS

     If any of the following conditions occur, the acl_get_fd() function re­
     turns a value of (acl_t)NULL and sets errno to the corresponding value:

     [EBADF]       The fd argument is not a valid file descriptor.

     [ENOMEM]      The ACL working storage requires more memory than is al­
                   lowed by the hardware or system-imposed memory management
                   constraints.

     [ENOTSUP]     The file system on which the file identified by fd is lo­
                   cated does not support ACLs, or ACLs are disabled.


STANDARDS

     IEEE Std 1003.1e draft 17 ("POSIX.1e", abandoned)


SEE ALSO

     acl_free(3),  acl_get_entry(3),  acl_get_file(3),  acl_set_fd(3),  acl(5)


AUTHOR

     Derived from the FreeBSD manual pages written by Robert N M Watson
     <rwatson@FreeBSD.org>, and adapted for Linux by Andreas Gruenbacher
     <a.gruenbacher@computer.org>.

 Linux ACL                      March 23, 2002                               1

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