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atexit_b(3) [osx man page]

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

atexit -- register a function to be called on exit SYNOPSIS
#include <stdlib.h> int atexit(void (*func)(void)); int atexit_b(void (^block)(void)); DESCRIPTION
The atexit() function registers the function func 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. The atexit_b() function is like atexit() except the callback is a block pointer instead of a function pointer. Note: The Block_copy() function (defined in <Blocks.h>) is used by atexit_b() to make a copy of the block, especially for the case when a stack-based block might go out of scope when the subroutine returns. These callbacks 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 callbacks may cause abnormal process termination, for example by calling abort(3).) At least 32 callbacks can always be registered; more are allowed as long as sufficient memory can be allocated. RETURN VALUES
The atexit() and atexit_b() functions return 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. SEE ALSO
The atexit() function conforms to ISO/IEC 9899:1990 (``ISO C90''). BSD
May 20, 2008 BSD

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atexit(3C)						   Standard C Library Functions 						atexit(3C)

atexit - register a function to run at process termination or object unloading SYNOPSIS
#include <stdlib.h> int atexit(void (*func)(void)); DESCRIPTION
The atexit() function registers the function pointed to by func to be called without arguments on normal termination of the program or when the object defining the function is unloaded. Normal termination occurs by either a call to the exit(3C) function or a return from main(). Object unloading occurs when a call to dlclose(3C) results in the object becoming unreferenced. The number of functions that may be registered with atexit() is limited only by available memory (refer to the _SC_ATEXIT_MAX argument of sysconf(3C)). After a successful call to any of the exec(2) functions, any functions previously registered by atexit() are no longer registered. On process exit, functions are called in the reverse order of their registration. On object unloading, any functions belonging to an unloadable object are called in the reverse order of their registration. RETURN VALUES
Upon successful completion, the atexit() function returns 0. Otherwise, it returns a non-zero value. ERRORS
The atexit() function may fail if: ENOMEM Insufficient storage space is available. USAGE
The functions registered by a call to atexit() must return to ensure that all registered functions are called. There is no way for an application to tell how many functions have already been registered with atexit(). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Safe | +-----------------------------+-----------------------------+ SEE ALSO
exec(2), dlclose(3C), exit(3C), sysconf(3C), attributes(5) SunOS 5.10 25 May 2001 atexit(3C)
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