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


SYNOPSIS

     acl_t
     acl_get_file(const char *path_p, acl_type_t type)


DESCRIPTION

     The acl_get_file() function retrieves the access ACL associated with a
     file or directory, or the default ACL associated with a directory. The
     pathname for the file or directory is pointed to by the argument path_p.
     The ACL is placed into working storage and acl_get_file() 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.

     The value of the argument type is used to indicate whether the access ACL
     or the default ACL associated with path_p is returned. If type is
     ACL_TYPE_ACCESS, the access ACL of path_p is returned. If type is
     ACL_TYPE_DEFAULT, the default ACL of path_p is returned. If type is
     ACL_TYPE_DEFAULT and no default ACL is associated with the directory
     path_p, then an ACL containing zero ACL entries is returned. If type
     specifies a type of ACL that cannot be associated with path_p, then the
     function fails.

     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_file() as an argu­
     ment.


RETURN VALUE

     Upon successful completion, this function returns a pointer to the work­
     ing storage.  Otherwise, a value of (acl_t)NULL is returned, and errno is
     set to indicate the error.


ERRORS

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

     [EACCES]      Search permission is denied for a component of the path
                   prefix or the object exists and the process does not have
                   appropriate access rights.

                   Argument type specifies a type of ACL that cannot be asso­
                   ciated with path_p.

     [EINVAL]      The argument type is not ACL_TYPE_ACCESS or ACL_TYPE_DE­
                   FAULT.

     [ENAMETOOLONG]
                   The length of the argument path_p is too long.

     [ENOENT]      The named object does not exist or the argument path_p
                   points to an empty string.

     [ENOMEM]      The ACL working storage requires more memory than is al­
     IEEE Std 1003.1e draft 17 ("POSIX.1e", abandoned)


SEE ALSO

     acl_free(3),  acl_get_entry(3),  acl_get_fd(3),  acl_set_file(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                               2

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