NAME

exit, on_exit − terminate a process after tidying up

SYNOPSIS

exit(status)
int status;

on_exit(func, data)
void (∗func)();
int data;

DESCRIPTION

Exit terminates a process after calling any functions registered with on_exit and then the Standard I/O library function _cleanup to flush any buffered output.  Exit never returns. 

On_exit is used to register a procedure to be called during the exit sequence.  Data is given to the called procedure as a parameter. 

DIAGNOSTICS

On_exit returns 0 if the registration happened, or -1 if there are already a maximum number of registered procedures. 

SEE ALSO

exit(2), intro(3)

BUGS

A maximum of four (4) functions can be registered with on_exit.

If the process terminates without calling exit (by directly calling _exit(2) or by an untrapped signal) then neither _cleanup, nor any of the registered procedures are called.

4.2 Berkeley Distribution  —  Revision 1.3 of 29/10/88