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EXIT(2) System Calls Manual EXIT(2)

exit - terminate process

exit(status)
int status;

_exit(status)
int status;

Exit is the normal means of terminating a process. Exit closes all the process's files and notifies the parent process if it is executing a wait. The low-order 8 bits of status are available to the parent process.

This call can never return.

The C function exit may cause cleanup actions before the final `sys exit'. The function _exit circumvents all cleanup.

wait(2)

(exit = 1.)
(status in r0)
sys exit

UNIX-7