ASSERT(3) Linux Programmer's Manual ASSERT(3)
assert - abort the program if assertion is false
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 stan-
dard 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.
No value is returned.
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.
assert() is implemented as a macro; if the expression tested has side-
effects, program behaviour will be different depending on whether NDE-
BUG is defined. This may create Heisenbugs which go away when debug-
ging is turned on.
exit(3), abort(3), assert_perror(3)
C99 2002-08-25 ASSERT(3)