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Revision 1.10, Wed Dec 10 21:15:30 2014 UTC (9 years, 5 months ago) by schwarze
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, OPENBSD_7_3_BASE, OPENBSD_7_3, OPENBSD_7_2_BASE, OPENBSD_7_2, OPENBSD_7_1_BASE, OPENBSD_7_1, OPENBSD_7_0_BASE, OPENBSD_7_0, OPENBSD_6_9_BASE, OPENBSD_6_9, OPENBSD_6_8_BASE, OPENBSD_6_8, OPENBSD_6_7_BASE, OPENBSD_6_7, OPENBSD_6_6_BASE, OPENBSD_6_6, OPENBSD_6_5_BASE, OPENBSD_6_5, OPENBSD_6_4_BASE, OPENBSD_6_4, OPENBSD_6_3_BASE, OPENBSD_6_3, OPENBSD_6_2_BASE, OPENBSD_6_2, OPENBSD_6_1_BASE, OPENBSD_6_1, OPENBSD_6_0_BASE, OPENBSD_6_0, OPENBSD_5_9_BASE, OPENBSD_5_9, OPENBSD_5_8_BASE, OPENBSD_5_8, OPENBSD_5_7_BASE, OPENBSD_5_7, HEAD
Changes since 1.9: +4 -4 lines 

HISTORY correction: v7, not v6.
Facts checked by Kaspars Bankovskis using tuhs.org archives.
The commit introducing the claim that it was in v6 (by
Keith Bostic on June 9, 1993) does not cite any sources:
http://svnweb.freebsd.org/csrg?view=revision&revision=62961

.\"	$OpenBSD: assert.3,v 1.10 2014/12/10 21:15:30 schwarze Exp $
.\"	$NetBSD: assert.3,v 1.5 1994/11/30 15:24:30 jtc Exp $
.\"
.\" Copyright (c) 1991, 1993
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.\"     @(#)assert.3	8.1 (Berkeley) 6/9/93
.\"
.Dd $Mdocdate: December 10 2014 $
.Dt ASSERT 3
.Os
.Sh NAME
.Nm assert
.Nd expression verification macro
.Sh SYNOPSIS
.In assert.h
.Fn assert expression
.Sh DESCRIPTION
The
.Fn assert
macro tests the given
.Fa expression
and if it is false, the calling process is terminated.
A diagnostic message is written to
.Dv stderr
and the
.Xr abort 3
function is called, effectively terminating the program.
.Pp
If
.Fa expression
is true, the
.Fn assert
macro does nothing.
.Pp
The
.Fn assert
macro may be removed at compile time with the
.Xr cc 1
option
.Fl DNDEBUG .
.Sh DIAGNOSTICS
The following diagnostic message is written to
.Dv stderr
if
.Fa expression
is false:
.Bd -literal -offset indent
"assertion \e"%s\e" failed: file \e"%s\e", line %d\en", \e
		    "expression", __FILE__, __LINE__);
.Ed
.Sh SEE ALSO
.Xr cc 1 ,
.Xr abort 3
.Sh STANDARDS
The
.Fn assert
macro conforms to
.St -ansiC .
.Sh HISTORY
An
.Fn assert
macro first appeared in
.At v7 .