atexit---request execution of functions at program exit
#include <stdlib.h> int atexit(void (*function)(void); @end example Description
You can use
atexitto enroll functions in a list of functions that will be called when your program terminates normally. The argument is a pointer to a user-defined function (which must not require arguments and must not return a result). The functions are kept in a LIFO stack; that is, the last function enrolled by
atexitwill be the first to execute when your program exits. There is no built-in limit to the number of functions you can enroll in this list; however, after every group of 32 functions is enrolled,
mallocto get space for the next part of the list. The initial list of 32 functions is statically allocated, so you can always count on at least that many slots available.
0if it succeeds in enrolling your function,
-1if it fails (possible only if no space was available for
mallocto extend the list of functions).
atexitis required by the ANSI standard, which also specifies that implementations must support enrolling at least 32 functions. Supporting OS subroutines required:
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