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ACL_GET_QUALIFIER(3) BSD Library Functions Manual ACL_GET_QUALIFIER(3)
NAME
acl_get_qualifier - retrieve the qualifier from an ACL entry
LIBRARY
Linux Access Control Lists library (libacl, -lacl).
SYNOPSIS
#include <sys/types.h>
#include <sys/acl.h>
void *
acl_get_qualifier(acl_entry_t entry_d);
DESCRIPTION
The acl_get_qualifier() function retrieves the qualifier from 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() is 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() is a pointer to type gid_t. If the tag type in
the ACL entry referred to by entry_d is a tag type for which a qualifier is not sup-
ported, acl_get_qualifier() returns a value of (void *)NULL and the function fails.
Subsequent operations using the returned pointer operate on an independent copy of
the qualifier in working storage, and will not change the qualifier of the ACL entry.
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 the
void * value returned by acl_get_qualifier() as an argument.
The argument entry_d and any other ACL entry descriptors that refer to entries within
the ACL containing the entry referred to by entry_d continue to refer to those
entries. The order of all existing entries in the ACL containing the entry referred
to by entry_d remains unchanged.
RETURN VALUE
On success, the function returns a pointer to the tag qualifier that was retrieved
into ACL working storage. On error, a value of (void *)NULL is returned and errno is
set appropriately.
ERRORS
If any of the following conditions occur, the acl_get_qualifier() function returns
(void *)NULL and sets errno to the corresponding value:
[EINVAL] The argument entry_d is not a valid descriptor for an ACL entry.
The value of the tag type in the ACL entry referenced by the argu-
ment entry_d is neither ACL_USER nor ACL_GROUP.
[ENOMEM] The value to be returned requires more memory than is allowed by
the hardware or system-imposed memory management constraints.
STANDARDS
IEEE Std 1003.1e draft 17 ("POSIX.1e", abandoned)
SEE ALSO
acl_create_entry(3), acl_free(3), acl_get_entry(3), acl_get_permset(3),
acl_get_tag_type(3), acl_set_permset(3), acl_set_qualifier(3), acl_set_tag_type(3),
acl(5)
AUTHOR
Derived from the FreeBSD manual pages written by Robert N M Watson
<rwatson AT FreeBSD.org>, and adapted for Linux by Andreas Gruenbacher
<a.gruenbacher AT bestbits.at>.
Linux ACL March 23, 2002 Linux ACL
Generated by $Id: phpMan.php,v 4.54 2007/08/21 09:05:22 chedong Exp $ Author: Che Dong
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