ASSERT(3) BSD Library Functions Manual ASSERT(3)
assert -- expression verification macro
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.
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__);
cc(1), _DIAGASSERT(3), abort(3)
The assert() macro conforms to ISO/IEC 9899:1999 (``ISO C99'').
A assert macro appeared in Version 6 AT&T UNIX.
Information on the name of the enclosing function appeared in ISO/IEC 9899:1999
BSD January 22, 2007 BSD