ATEXIT(3) NetBSD 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 atexit() function registers the given function to be called at pro- gram exit, whether via exit(3) or via return from the program's main. 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.
[ENOMEM] No memory was available to add the function to the list. The existing list of functions is unmodified.
The atexit() function conforms to ANSI X3.159-1989 (``ANSI C89''). NetBSD 6.0 June 4, 1993 NetBSD 6.0
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