assert(3X)assert(3X)NAMEassert() - verify program assertion
This macro is useful for putting diagnostics into programs. When it is
executed, if expression is false (zero), prints:
on the standard error output and aborts. In the error message, xyz is
the name of the source file and nnn the source line number of the
Compiling with the preprocessor option (see cpp(1)), or with the pre‐
processor control statement ahead of the statement, stops assertions
from being compiled into the program.
The expression argument used by in compatibility mode cannot contain
string literals or double quotes without escapes.
SEE ALSOcpp(1), abort(3C), thread_safety(5).