| .\" Copyright (C) 2002 Andries Brouwer <aeb@cwi.nl> |
| .\" |
| .\" %%%LICENSE_START(VERBATIM) |
| .\" 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| .\" manual page may be incorrect or out-of-date.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. |
| .\" %%%LICENSE_END |
| .\" |
| .\" This replaces an earlier man page written by Walter Harms |
| .\" <walter.harms@informatik.uni-oldenburg.de>. |
| .\" |
| .TH ASSERT_PERROR 3 2015-03-02 "GNU" "Linux Programmer's Manual" |
| .SH NAME |
| assert_perror \- test errnum and abort |
| .SH SYNOPSIS |
| .nf |
| .BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */" |
| .B #include <assert.h> |
| .sp |
| .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; |
| lb lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR assert_perror () |
| T} Thread safety MT-Safe |
| .TE |
| |
| .SH CONFORMING TO |
| This is a GNU extension. |
| .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) |