112 lines
2.9 KiB
Groff
112 lines
2.9 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 2000 Jonathan M. Bresler
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.\"
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.\" All rights reserved.
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.\"
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.\" This program is free software.
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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 DEVELOPERS ``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 DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd January 14, 2000
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.Os
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.Dt SPLASSERT 9
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.Sh NAME
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.Nm SPLASSERT
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.Nd kernel spl level verification macro
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.Sh SYNOPSIS
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.Cd options INVARIANTS
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.Cd options INVARIANT_SUPPORT
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.Fn SPLASSERT level "const char *msg"
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.Sh DESCRIPTION
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.Bf -symbolic
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This API is deprecated.
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Use mutexes to protect data structures instead.
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See
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.Xr mutex 9
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for more information.
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.Ef
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.Pp
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In a kernel compiled with both "options INVARIANTS"
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and "options INVARIANT_SUPPORT",
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the
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.Fn SPLASSERT
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macro compares the current spl level of the kernel with the spl
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.Fa level
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specified in the macro
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.Fn SPLASSERT .
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If the specified
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.Fa level
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is not active
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.Fn SPLASSERT
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calls the
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.Fn KASSERT
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macro with the
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.Fa msg ,
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terminating the running system.
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.Pp
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In a kernel that does not have both "options INVARIANTS"
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and "options INVARIANT_SUPPORT",
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the
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.Fn SPLASSERT
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macro is defined to be a no-op.
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.Pp
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The behaviour of
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.Fn SPLASSERT
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is tunable by means of the
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.Xr sysctl 8
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knob kern.splassertmode.
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When set to 0 the
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.Fn SPLASSERT
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macro is defined to be a no-op.
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When set to 1 the
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.Fn SPLASSERT
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macro is defined to log information to the console.
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When set to 2 the
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.Fn SPLASSERT
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macro is defined to
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.Xr panic 9 .
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.Sh EXAMPLES
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The kernel function
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.Fn rtalloc
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must be called at
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.Fn splnet :
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.Bd -literal -offset indent
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void
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rtalloc(ro)
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register struct route *ro;
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{
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SPLASSERT(net, "rtalloc()");
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rtalloc_ign(ro, 0UL);
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}
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.Ed
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.Sh SEE ALSO
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.Xr config 8 ,
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.Xr CONDSPLASSERT 9 ,
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.Xr KASSERT 9 ,
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.Xr panic 9
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.Sh AUTHORS
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This manual page was written by
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.An Jonathan M. Bresler
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.Aq jmb@FreeBSD.org .
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