atexit(3p) - phpMan

ATEXIT(P)                                                            ATEXIT(P)



NAME
       atexit - register a function to run at process termination

SYNOPSIS
       #include <stdlib.h>

       int atexit(void (*func)(void));


DESCRIPTION
       The  atexit() function shall register the function pointed to by func, to be called
       without arguments at normal program termination. At normal program termination, all
       functions registered by the atexit() function shall be called, in the reverse order
       of their registration, except that a function is called after any previously regis-
       tered  functions that had already been called at the time it was registered. Normal
       termination occurs either by a call to exit() or a return from main().

       At least 32 functions can be registered with atexit().

       After a successful call to any of the exec functions, any functions previously reg-
       istered by atexit() shall no longer be registered.

RETURN VALUE
       Upon  successful  completion, atexit() shall return 0; otherwise, it shall return a
       non-zero value.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The functions registered by a call to atexit() must return to ensure that all  reg-
       istered functions are called.

       The application should call sysconf() to obtain the value of {ATEXIT_MAX}, the num-
       ber of functions that can be registered. There is no way for an application to tell
       how many functions have already been registered with atexit().

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       exit()   ,  sysconf()  ,  the  Base  Definitions  volume  of  IEEE Std 1003.1-2001,
       <stdlib.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std
       1003.1,  2003  Edition,  Standard  for Information Technology -- Portable Operating
       System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C)
       2001-2003  by  the  Institute  of Electrical and Electronics Engineers, Inc and The
       Open Group. In the event of any discrepancy between this version and  the  original
       IEEE  and The Open Group Standard, the original IEEE and The Open Group Standard is
       the  referee  document.  The  original  Standard  can   be   obtained   online   at
       http://www.opengroup.org/unix/online.html .



POSIX                                2003                            ATEXIT(P)

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