The acl_get_perm() function tests if the permission specified by the
argument perm (one of ACL_READ, ACL_WRITE, ACL_EXECUTE) 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.
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 indi‐
cate the error.
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.
This page is part of the acl (manipulating access control lists)
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http://savannah.nongnu.org/projects/acl. If you have a bug report for
this manual page, see http://savannah.nongnu.org/bugs/?group=acl. This
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Linux ACL March 23, 2002 Linux ACL