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+'\" t
+.\" Copyright (C) 2002 Andries Brouwer <aeb@cwi.nl>
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.\" This replaces an earlier man page written by Walter Harms
+.\" <walter.harms@informatik.uni-oldenburg.de>.
+.\"
+.TH assert_perror 3 (date) "Linux man-pages (unreleased)"
+.SH NAME
+assert_perror \- test errnum and abort
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.BR "#define _GNU_SOURCE" "         /* See feature_test_macros(7) */"
+.B #include <assert.h>
+.P
+.BI "void assert_perror(int " errnum );
+.fi
+.SH DESCRIPTION
+If the macro
+.B NDEBUG
+was defined at the moment
+.I <assert.h>
+was last included, the macro
+.BR assert_perror ()
+generates no code, and hence does nothing at all.
+Otherwise, the macro
+.BR assert_perror ()
+prints an error message to standard error and terminates the program
+by calling
+.BR abort (3)
+if
+.I errnum
+is nonzero.
+The message contains the filename, function name and
+line number of the macro call, and the output of
+.IR strerror(errnum) .
+.SH RETURN VALUE
+No value is returned.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR assert_perror ()
+T}	Thread safety	MT-Safe
+.TE
+.SH STANDARDS
+GNU.
+.SH BUGS
+The purpose of the assert macros is to help programmers find bugs in
+their programs, things that cannot happen unless there was a coding mistake.
+However, with system or library calls the situation is rather different,
+and error returns can happen, and will happen, and should be tested for.
+Not by an assert, where the test goes away when
+.B NDEBUG
+is defined,
+but by proper error handling code.
+Never use this macro.
+.SH SEE ALSO
+.BR abort (3),
+.BR assert (3),
+.BR exit (3),
+.BR strerror (3)