07-05-2012
Whether it's the right approach or not really depends on what perm does. It might be the right approach. It might not. We literally have no idea.
Until you explain what perm actually does -- the input you feed into it and the output you expect from it -- we can't help you.
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LEARN ABOUT SUSE
acl_get_perm
ACL_GET_PERM(3) BSD Library Functions Manual ACL_GET_PERM(3)
NAME
acl_get_perm -- test for a permission in an ACL permission set
LIBRARY
Linux Access Control Lists library (libacl, -lacl).
SYNOPSIS
#include <sys/types.h>
#include <acl/libacl.h>
int
acl_get_perm(acl_permset_t permset_d, acl_perm_t perm);
DESCRIPTION
The acl_get_perm() function tests if the permission specified by the argument perm is contained in the ACL permission set pointed to by the
argument permset_d.
Any existing descriptors that refer to permset_d continue to refer to that permission set.
RETURN VALUE
If successful, the acl_get_perm() function returns 1 if the permission specified by perm is contained in the ACL permission set permset_d,
and 0 if the permission is not contained in the permission set. Otherwise, the value -1 is returned and the global variable errno is set to
indicate the error.
ERRORS
If any of the following conditions occur, the acl_get_perm() function returns -1 and sets errno to the corresponding value:
[EINVAL] The argument permset_d is not a valid descriptor for a permission set within an ACL entry.
The argument perm is not a valid acl_perm_t value.
STANDARDS
This is a non-portable, Linux specific extension to the ACL manipulation functions defined in IEEE Std 1003.1e draft 17 ("POSIX.1e", aban-
doned).
SEE ALSO
acl_add_perm(3), acl_clear_perms(3), acl_delete_perm(3), acl_get_permset(3), acl_set_permset(3), acl(5)
AUTHOR
Written by Andreas Gruenbacher <a.gruenbacher@bestbits.at>.
Linux ACL March 23, 2002 Linux ACL