2.17 exit—end program execution

Synopsis

#include <stdlib.h>
void exit(int code);

Description
Use exit to return control from a program to the host operating environment. Use the argument code to pass an exit status to the operating environment: two particular values, EXIT_SUCCESS and EXIT_FAILURE, are defined in ‘stdlib.h’ to indicate success or failure in a portable fashion.

exit does two kinds of cleanup before ending execution of your program. First, it calls all application-defined cleanup functions you have enrolled with atexit. Second, files and streams are cleaned up: any pending output is delivered to the host system, each open file or stream is closed, and files created by tmpfile are deleted.

Returns
exit does not return to its caller.

Portability
ANSI C requires exit, and specifies that EXIT_SUCCESS and EXIT_FAILURE must be defined.

Supporting OS subroutines required: _exit.