acl_get_qualifier(3) [freebsd man page]

ACL_GET_QUALIFIER(3)					   BSD Library Functions Manual 				      ACL_GET_QUALIFIER(3)

NAME

     acl_get_qualifier -- retrieve the qualifier from an ACL entry

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

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

     void *
     acl_get_qualifier(acl_entry_t entry_d);

DESCRIPTION

     The acl_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 refer-
			enced by argument entry_d is not ACL_USER or ACL_GROUP.

     [ENOMEM]		The value to be returned requires more memory than is allowed by the hardware or system-imposed memory management con-
			straints.

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>.

BSD
								  March 13, 2001							       BSD

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 supported, 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 argument 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 con-
			straints.

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@FreeBSD.org>, and adapted for Linux by Andreas Gruenbacher
     <a.gruenbacher@bestbits.at>.

Linux ACL							  March 23, 2002							 Linux ACL