1.\" Copyright (c) 1990, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Chris Torek. 6.\" %sccs.include.redist.man% 7.\" 8.\" @(#)atexit.3 5.2 (Berkeley) 04/19/91 9.\" 10.Dd 11.Dt ATEXIT 3 12.Os 13.Sh NAME 14.Nm atexit 15.Nd register a function to be called on exit 16.Sh SYNOPSIS 17.Fd #include <stdlib.h> 18.Ft int 19.Fn atexit "void (*function)(void)" 20.Sh DESCRIPTION 21The 22.Fn atexit 23function 24registers the given 25.Ar function 26to be called at program exit, whether via 27.Xr exit 3 28or via return from the program's 29.Em main . 30Functions so registered are called in reverse order; 31no arguments are passed. 32At least 32 functions can always be registered, 33and more are allowed as long as sufficient memory can be allocated. 34.Sh RETURN VALUES 35.Rv -std atexit 36.Sh ERRORS 37.Bl -tag -width [ENOMEM] 38.It Bq Er ENOMEM 39No memory was available to add the function to the list. 40The existing list of functions is unmodified. 41.El 42.Sh SEE ALSO 43.Xr exit 3 44.Sh STANDARDS 45The 46.Fn atexit 47function 48conforms to 49.St -ansiC . 50