abort(3) Library Functions Manual abort(3) Name abort - generate an illegal instruction fault Syntax #include <stdlib.h> void abort() Description The subroutine executes an instruction which is illegal in user mode. This causes a signal that normally terminates the process with a core dump, which may be used for debugging. Diagnostics Illegal instruction - core dumped - Bourne shell. Illegal instruction (core dumped) - C shell. Environment When your program is compiled using the System V or POSIX environment, closes open files before aborting the process with an IOT fault. Restrictions The function does not flush standard I/O buffers. Use For further information, see See Also adb(1), exit(2), sigvec(2), fclose(3s) abort(3)