ASSERT(3) Linux Programmer's Manual ASSERT(3)NAME
assert - abort the program if assertion is false
SYNOPSIS
#include <assert.h>
void assert(scalar expression);
DESCRIPTION
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.
RETURN VALUE
No value is returned.
CONFORMING TO
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.
BUGS
assert() is implemented as a macro; if the expression tested has side-effects, program behavior will be different depending on whether NDE-
BUG is defined. This may create Heisenbugs which go away when debugging is turned on.
SEE ALSO abort(3), assert_perror(3), exit(3)COLOPHON
This page is part of release 3.27 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)
Check Out this Related Man Page
ASSERT(3) Linux Programmer's Manual ASSERT(3)NAME
assert - abort the program if assertion is false
SYNOPSIS
#include <assert.h>
void assert(scalar expression);
DESCRIPTION
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 output and terminates the program by calling abort() 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.
RETURN VALUE
No value is returned.
CONFORMING TO
ISO9899 (ANSI C). In the 1990 standard, expression is required to be of type int and undefined behavior results if it is not, but in the
1999 standard it may have any scalar type.
BUGS
assert() is implemented as a macro; if the expression tested has side-effects, program behaviour will be different depending on whether
NDEBUG is defined. This may create Heisenbugs which go away when debugging is turned on.
SEE ALSO exit(3), abort(3), assert_perror(3)C99 2002-08-25 ASSERT(3)
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