1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Chris Torek and the American National Standards Committee X3, 6.\" on Information Processing Systems. 7.\" 8.\" %sccs.include.redist.man% 9.\" 10.\" @(#)atexit.3 8.1 (Berkeley) 06/04/93 11.\" 12.Dd 13.Dt ATEXIT 3 14.Os 15.Sh NAME 16.Nm atexit 17.Nd register a function to be called on exit 18.Sh SYNOPSIS 19.Fd #include <stdlib.h> 20.Ft int 21.Fn atexit "void (*function)(void)" 22.Sh DESCRIPTION 23The 24.Fn atexit 25function 26registers the given 27.Ar function 28to be called at program exit, whether via 29.Xr exit 3 30or via return from the program's 31.Em main . 32Functions so registered are called in reverse order; 33no arguments are passed. 34At least 32 functions can always be registered, 35and more are allowed as long as sufficient memory can be allocated. 36.Sh RETURN VALUES 37.Rv -std atexit 38.Sh ERRORS 39.Bl -tag -width [ENOMEM] 40.It Bq Er ENOMEM 41No memory was available to add the function to the list. 42The existing list of functions is unmodified. 43.El 44.Sh SEE ALSO 45.Xr exit 3 46.Sh STANDARDS 47The 48.Fn atexit 49function 50conforms to 51.St -ansiC . 52