67 lines
2.6 KiB
Groff
67 lines
2.6 KiB
Groff
.\"
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.\" Copyright (c) 1996 Julian R Elischer
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed by Kenneth Stailey.
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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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed for the FreeBSD Project
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.\" by Julian R Elischer
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.\" 4. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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.\" 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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.Dd Oct 15, 1996
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.Dt SUSER 9
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.Os FreeBSD
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.Sh NAME
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.Nm suser
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.Nd check if we are superuser and note
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.Sh SYNOPSIS
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.Fd #include <sys/ucred.h>
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.Ft int
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.Fn suser "struct ucred *cred, u_short *acflag"
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.Sh DESCRIPTION
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The
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.Nm
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function checks if the credentials given include superuser powers.
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.Pp
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The
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.Nm
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routine notes the fact that superuser powers have been used in the
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word pointed to by the second argument which should be a pointer to
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the p_acflags word of the proc structure. If the second argument is NULL
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then the usage is not noted. Because part of it's function is to notice
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whether super powers have been used,
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.Nm
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should be called after other permission possibilities have been exhausted.
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.Sh RETURN VALUES
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The
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.Nm
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function returns 0 if the user has super powers and EPERM otherwise.
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This is the
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.Em reverse logic
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of some other implementations of
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.Nm
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in which a TRUE response indicates Super powers.
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