assert_perror — test errnum and abort
#define _GNU_SOURCE #include <assert.h>
void
assert_perror( |
int | errnum); |
If the macro NDEBUG was
defined at the moment <assert.h>
was last included, the macro assert_perror() generates no code, and
hence does nothing at all. Otherwise, the macro assert_perror() prints an error message to
standard error and terminates the program by calling
abort(3) if errnum is nonzero. The message
contains the filename, function name and line number of the
macro call, and the output of strerror(errnum).
The purpose of the assert macros is to help the programmer
find bugs in his program, 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 NDEBUG is defined, but by proper error
handling code. Never use this macro.
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
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Copyright (C) 2002 Andries Brouwer <aebcwi.nl> Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. This replaces an earlier man page written by Walter Harms <walter.harmsinformatik.uni-oldenburg.de>. |