NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | CONFORMING TO | BUGS | SEE ALSO | COLOPHON
ASSERT(3) Linux Programmer's Manual ASSERT(3)
assert - abort the program if assertion is false
#include <assert.h>
void assert(scalar expression);
If the macro NDEBUG was defined at the moment <assert.h> was last included,
the macro assert() generates no code, and hence does nothing at all.
Otherwise, the macro assert() prints an error message to standard error and
terminates the program by calling abort(3) if expression is false (i.e.,
compares equal to zero).
The purpose of this macro is to help the programmer find bugs in his program.
The message "assertion failed in file foo.c, function do_bar(), line 1287" is
of no help at all to a user.
No value is returned.
POSIX.1-2001, C89, C99. In C89, expression is required to be of type int and
undefined behavior results if it is not, but in C99 it may have any scalar
type.
assert() is implemented as a macro; if the expression tested has side-effects,
program behavior will be different depending on whether NDEBUG is defined.
This may create Heisenbugs which go away when debugging is turned on.
abort(3), assert_perror(3), exit(3)
This page is part of release 3.23 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/.
GNU 2002-08-25 ASSERT(3)