DragonFly On-Line Manual Pages


ATEXIT(3)	      DragonFly Library Functions Manual	     ATEXIT(3)

NAME

atexit -- register a function to be called on exit

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <stdlib.h> int atexit(void (*function)(void));

DESCRIPTION

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. These functions must not call exit(); if it should be necessary to termi- nate the process while in such a function, the _exit(2) function should be used. (Alternatively, the function may cause abnormal process termi- nation, 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.

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.

SEE ALSO

at_quick_exit(3), exit(3)

STANDARDS

The atexit() function conforms to ISO/IEC 9899:1990 (``ISO C90''). DragonFly 3.7 September 6, 2002 DragonFly 3.7