ATEXIT(3) Library Functions Manual ATEXIT(3)

atexit — register a function to be called on exit

Standard C Library (libc, -lc)

#include <stdlib.h>

int
atexit(void (*function)(void));

The () function registers the given function to be called at program exit, whether via exit(3) or via return from the program's . Functions so registered are called in reverse order; no arguments are passed. At least 32 functions can always be registered, and more are allowed as long as sufficient memory can be allocated.

The atexit() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

[]
No memory was available to add the function to the list. The existing list of functions is unmodified.

at_quick_exit(3), exit(3), quick_exit(3)

The atexit() function conforms to ANSI X3.159-1989 (“ANSI C89”).

June 4, 1993 NetBSD 11.0