141 lines
3.8 KiB
Groff
141 lines
3.8 KiB
Groff
.\"-
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.\" Copyright (c) 2001 Chris D. Faulhaber
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd March 13, 2001
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.Dt ACL_GET_QUALIFIER 3
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.Os
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.Sh NAME
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.Nm acl_get_qualifier
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.Nd retrieve the qualifier from an ACL entry
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/acl.h
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.Ft void *
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.Fn acl_get_qualifier "acl_entry_t entry_d"
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.Sh DESCRIPTION
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The
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.Fn acl_get_qualifier
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function
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is a POSIX.1e call that retrieves the qualifier of the tag for
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the ACL entry indicated by the argument
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.Fa entry_d
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into working storage and returns a pointer to that storage.
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.Pp
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If the value of the tag type in the ACL entry referred to by
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.Fa entry_d
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is
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.Dv ACL_USER ,
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then the value returned by
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.Fn acl_get_qualifier
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will be a pointer to type
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.Vt uid_t .
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.Pp
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If the value of the tag type in
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the ACL entry referred to by
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.Fa entry_d
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is
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.Dv ACL_GROUP ,
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then the value returned by
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.Fn acl_get_qualifier
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will be a pointer to type
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.Vt gid_t .
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.Pp
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If the value of the tag type in the ACL entry referred to by
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.Fa entry_d
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is
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.Dv ACL_UNDEFINED_TAG , ACL_USER_OBJ , ACL_GROUP_OBJ ,
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.Dv ACL_OTHER , ACL_MASK ,
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or an implementation-defined value for which a qualifier
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is not supported, then
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.Fn acl_get_qualifier
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will return a value of
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.Vt ( void * ) Ns Dv NULL
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and the function will fail.
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.Pp
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This function may cause memory to be allocated.
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The caller should
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free any releasable memory, when the new qualifier is no longer
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required, by calling
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.Fn acl_free
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with
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.Vt void *
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as the argument.
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.Sh RETURN VALUES
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The
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.Fn acl_get_qualifier
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function returns a pointer to the allocated storage if successful;
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otherwise a
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.Dv NULL
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pointer is returned and the global variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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The
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.Fn acl_get_qualifier
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fails if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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Argument
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.Fa entry_d
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does not point to a valid descriptor for an ACL entry.
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The
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value of the tag type in the ACL entry referenced by argument
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.Fa entry_d
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is not
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.Dv ACL_USER
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or
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.Dv ACL_GROUP .
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.It Bq Er ENOMEM
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The value to be returned requires more memory than is allowed
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by the hardware or system-imposed memory management constraints.
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.El
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.Sh SEE ALSO
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.Xr acl 3 ,
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.Xr acl_create_entry 3 ,
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.Xr acl_free 3 ,
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.Xr acl_get_entry 3 ,
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.Xr acl_get_tag_type 3 ,
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.Xr acl_set_qualifier 3 ,
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.Xr acl_set_tag_type 3 ,
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.Xr posix1e 3
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.Sh STANDARDS
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POSIX.1e is described in IEEE POSIX.1e draft 17.
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.Sh HISTORY
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POSIX.1e support was introduced in
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.Fx 4.0 .
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The
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.Fn acl_get_qualifier
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function was added in
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.Fx 5.0 .
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.Sh AUTHORS
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The
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.Fn acl_get_qualifier
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function was written by
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.An Chris D. Faulhaber Aq jedgar@fxp.org .
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