Manpage of ASSERT

ASSERT

Section: Linux Programmer's Manual (3)
Updated: 2015-08-08
Index
 

NAME

assert - abort the program if assertion is false  

SYNOPSIS

#include <assert.h>void assert(scalar expression);
 

DESCRIPTION

If the macro NDEBUGwas 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 expressionis false (i.e., compares equal to zero).

The purpose of this macro is to help programmers find bugs in their programs. The message "assertion failed in file foo.c, function do_bar(), line 1287" is of no help at all to a user.  

RETURN VALUE

No value is returned.  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
assert() Thread safetyMT-Safe

 

CONFORMING TO

POSIX.1-2001, POSIX.1-2008, C89, C99. In C89, expressionis required to be of type intand undefined behavior results if it is not, but in C99 it may have any scalar type.  

BUGS

assert() is implemented as a macro; if the expression tested has side-effects, program behavior will be different depending on whether NDEBUGis defined. This may create Heisenbugs which go away when debugging is turned on.  

SEE ALSO

abort(3), assert_perror(3), exit(3)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ATTRIBUTES
CONFORMING TO
BUGS
SEE ALSO

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Time: 22:27:57 GMT, June 20, 2016