NAME
acl_get_qualifier —
retrieve the qualifier from an ACL
entry
LIBRARY
library “libc”
SYNOPSIS
#include
<sys/types.h>
#include <sys/acl.h>
void *
acl_get_qualifier(acl_entry_t
entry_d);
DESCRIPTION
Theacl_get_qualifier()
function is a POSIX.1e call that retrieves the qualifier of the tag for the
ACL entry indicated by the argument entry_d into working
storage and returns a pointer to that storage.
If the value of the tag type in the ACL
entry referred to by entry_d is
ACL_USER, then the value returned by
acl_get_qualifier()
will be a pointer to type uid_t.
If the value of the tag type in the ACL
entry referred to by entry_d is
ACL_GROUP, then the value returned by
acl_get_qualifier()
will be a pointer to type gid_t.
If the value of the tag type in the ACL
entry referred to by entry_d is
ACL_UNDEFINED_TAG,
ACL_USER_OBJ, ACL_GROUP_OBJ,
ACL_OTHER, ACL_MASK, or an
implementation-defined value for which a qualifier is not supported, then
acl_get_qualifier()
will return a value of (void
*)NULL and the function will fail.
This function may cause memory to be allocated. The
caller should free any releasable memory, when the new qualifier is no
longer required, by calling
acl_free()
with void * as the argument.
RETURN VALUES
The acl_get_qualifier() function returns a
pointer to the allocated storage if successful; otherwise a
NULL pointer is returned and the global variable
errno is set to indicate the error.
ERRORS
The acl_get_qualifier() fails if:
- [
EINVAL] - Argument entry_d does not point to a valid
descriptor for an ACL entry. The value of the tag type in the ACL entry
referenced by argument entry_d is not
ACL_USERorACL_GROUP. - [
ENOMEM] - The value to be returned requires more memory than is allowed by the hardware or system-imposed memory management constraints.
SEE ALSO
acl(3), acl_create_entry(3), acl_free(3), acl_get_entry(3), acl_get_tag_type(3), acl_set_qualifier(3), acl_set_tag_type(3), posix1e(3)
STANDARDS
POSIX.1e is described in IEEE POSIX.1e draft 17.
HISTORY
POSIX.1e support was introduced in FreeBSD
4.0. The acl_get_qualifier() function was
added in FreeBSD 5.0.
AUTHORS
The acl_get_qualifier() function was
written by Chris D. Faulhaber
<jedgar@fxp.org>.