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ASSERT(3) Library Functions Manual ASSERT(3) NAME assert - expression verification macro SYNOPSIS #include <assert.h> assert(expression); DESCRIPTION The assert() macro tests the given expression and if it is false, the calling process is terminated. A diagnostic message, consisting of the text of the expression, the name of the source file, the line number and the enclosing function, is written to stderr and the abort(3) function is called, effectively terminating the program. If expression is true, the assert() macro does nothing. The assert() macro may be removed at compile time with the cc(1) option -DNDEBUG. DIAGNOSTICS The following diagnostic message is written to stderr if expression is false: "assertion \"%s\" failed: file \"%s\", line %d, function \"%s\"\n", \ "expression", __FILE__, __LINE__, __func__); SEE ALSO cc(1), _DIAGASSERT(3), abort(3) STANDARDS The assert() macro conforms to ISO/IEC 9899:1999 ("ISO C99"). HISTORY A assert macro appeared in Version 7 AT&T UNIX. Information on the name of the enclosing function appeared in ISO/IEC 9899:1999 ("ISO C99"). NetBSD 8.0 June 1, 2016 NetBSD 8.0