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(freebsd section 3)
man page for atexit

ATEXIT(3)						   BSD Library Functions Manual 						 ATEXIT(3)

atexit -- register a function to be called on exit LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <stdlib.h> int atexit(void (*function)(void)); int atexit_b(void (^function)(void)); DESCRIPTION
The atexit() function registers the given function to be called at program 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. These functions must not call exit(); if it should be necessary to terminate the process while in such a function, the _exit(2) function should be used. (Alternatively, the function may cause abnormal process termination, for example by calling abort(3).) At least 32 functions can always be registered, and more are allowed as long as sufficient memory can be allocated. The atexit_b() function behaves identically to atexit(), except that it takes a block, rather than a function pointer. RETURN VALUES
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. ERRORS
[ENOMEM] No memory was available to add the function to the list. The existing list of functions is unmodified. [ENOSYS] The atexit_b() function was called by a program that did not supply a _Block_copy() implementation. SEE ALSO
at_quick_exit(3), exit(3) STANDARDS
The atexit() function conforms to ISO/IEC 9899:1990 (``ISO C90''). BSD
September 6, 2002 BSD

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