Copyright (c) 2001 Chris D. Faulhaber
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$FreeBSD: src/lib/libc/posix1e/acl_get_qualifier.3,v 1.6 2002/12/27 12:15:28 schweikh Exp $
.Dd March 13, 2001 .Dt ACL_GET_QUALIFIER 3 .Os .Sh NAME .Nm acl_get_qualifier .Nd retrieve the qualifier from an ACL entry .Sh LIBRARY .Lb libc .Sh SYNOPSIS n sys/types.h n sys/acl.h .Ft void * .Fn acl_get_qualifier "acl_entry_t entry_d" .Sh DESCRIPTION The .Fn acl_get_qualifier function is a POSIX.1e call that retrieves the qualifier of the tag for the ACL entry indicated by the argument .Fa entry_d into working storage and returns a pointer to that storage.
p If the value of the tag type in the ACL entry referred to by .Fa entry_d is .Dv ACL_EXTENDED_ALLOW or .Dv ACL_EXTENDED_DENY The value returned by .Fn acl_get_qualifier will be a pointer to type .Vt guid_t .
p If the value of the tag type in the ACL entry referred to by .Fa entry_d is .Dv ACL_UNDEFINED_TAG , a tag type specified by POSIX.1e but not supported or an implementation-defined value for which a qualifier is not supported, then .Fn acl_get_qualifier will return a value of .Vt ( void * ) Ns Dv NULL and the function will fail.
p 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 .Fn acl_free with .Vt void * as the argument. .Sh RETURN VALUES The .Fn acl_get_qualifier function returns a pointer to the allocated storage if successful; otherwise a .Dv NULL pointer is returned and the global variable .Va errno is set to indicate the error. .Sh ERRORS The .Fn acl_get_qualifier fails if: l -tag -width Er t Bq Er EINVAL Argument .Fa 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 .Fa entry_d is not .Dv ACL_EXTENDED_ALLOW or .Dv ACL_EXTENDED_DENY . t Bq Er ENOMEM The value to be returned requires more memory than is allowed by the hardware or system-imposed memory management constraints. .El .Sh SEE ALSO .Xr acl 3 , .Xr acl_create_entry 3 , .Xr acl_free 3 , .Xr acl_get_entry 3 , .Xr acl_get_tag_type 3 , .Xr acl_set_qualifier 3 , .Xr acl_set_tag_type 3 , .Xr posix1e 3 .Sh STANDARDS POSIX.1e is described in IEEE POSIX.1e draft 17. .Sh AUTHORS .An Michael Smith .An Chris D. Faulhaber