| .\" Copyright (C) 2002 Andries Brouwer <aeb@cwi.nl> |
| .\" |
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| .\" This replaces an earlier man page written by Walter Harms |
| .\" <walter.harms@informatik.uni-oldenburg.de>. |
| .\" |
| .TH ASSERT_PERROR 3 2017-09-15 "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> |
| .PP |
| .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 |
| .sp 1 |
| .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) |
