osx man page for acl_get_entry

ACL_GET_ENTRY(3)					   BSD Library Functions Manual 					  ACL_GET_ENTRY(3)

NAME
     acl_get_entry -- retrieve an ACL entry from an ACL

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/types.h>
     #include <sys/acl.h>

     int
     acl_get_entry(acl_t acl, int entry_id, acl_entry_t *entry_p);

DESCRIPTION
     The acl_get_entry() function is a POSIX.1e call that retrieves a descriptor for an ACL entry specified by the argument entry_d within the ACL
     indicated by the argument acl.

     If the value of entry_id is ACL_FIRST_ENTRY, then the function will return in entry_p a descriptor for the first ACL entry within acl.  If a
     call is made to acl_get_entry() with entry_id set to ACL_NEXT_ENTRY when there has not been either an initial successful call to
     acl_get_entry(), or a previous successfull call to acl_create_entry(), acl_delete_entry(), acl_dup(), acl_from_text(), acl_get_fd(),
     acl_get_file(), acl_set_fd(), acl_set_file(), or acl_valid(), then the result is unspecified.

     The caller may also set entry_id to the index of the desired entry within the ACL.  This is a non-portable extension.  A subsequent call with
     entry_id set to ACL_NEXT_ENTRY will return the entry following the previously nominated entry and so forth.

RETURN VALUES
     If the acl_get_entry() function successfully obtains an ACL entry, a value of 0 is returned.  Otherwise, a value of -1 will be returned and
     the global variable errno will be set to indicate the error.

ERRORS
     The acl_get_entry() fails if:

     [EINVAL]		Argument acl does not point to a valid ACL.  Argument entry_id is neither ACL_FIRST_ENTRY, ACL_NEXT_ENTRY or a valid entry
			index.

     [EINVAL]		The value of entry_id is ACL_NEXT_ENTRY and the last ACL entry in the ACL has already been returned by a previous call to
			acl_get_entry().

SEE ALSO
     acl(3), acl_calc_mask(3), acl_create_entry(3), acl_delete_entry(3), acl_dup(3), acl_from_text(3), acl_get_fd(3), acl_get_file(3),
     acl_init(3), acl_set_fd(3), acl_set_file(3), acl_valid(3), posix1e(3)

STANDARDS
     POSIX.1e is described in IEEE POSIX.1e draft 17.

AUTHORS
     Michael Smith
     Chris D. Faulhaber

BSD
								  April 13, 2001							       BSD