NAME
assert_perror - test errnum and abort
SYNOPSIS
#define _GNU_SOURCE
#include <assert.h>
I void assert_perror(int errnum );
DESCRIPTION
If the macro
NDEBUG
was defined at the moment
<assert.h>
was last included, the macro
R assert_perror ()
generates no code, and hence does nothing at all.
Otherwise, the macro
R assert_perror ()
prints an error message to standard error and terminates the program
by calling
abort(3)
if
errnum
is non-zero.
The message contains the filename, function name and
line number of the macro call, and the output of
R strerror(errnum) .
RETURN VALUE
No value is returned.
CONFORMING TO
This is a GNU extension.
BUGS
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.
SEE ALSO
