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FreeBSD 11.0 - man page for at_quick_exit (freebsd section 3)

AT_QUICK_EXIT(3)					   BSD Library Functions Manual 					  AT_QUICK_EXIT(3)

NAME
at_quick_exit -- registers a cleanup function to run on quick exit
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdlib.h> int at_quick_exit(void (*func)(void));
DESCRIPTION
The at_quick_exit() function registers a cleanup function to be called when the program exits as a result of calling quick_exit(3). The cleanup functions are called in the reverse order and will not be called if the program exits by calling exit(3), _Exit(3), or abort(3).
RETURN VALUES
The at_quick_exit() function returns the value 0 if successful and a non-zero value on failure.
SEE ALSO
exit(3), quick_exit(3)
STANDARDS
The at_quick_exit() function conforms to ISO/IEC 9899:2011 (``ISO C11'').
BSD
December 7, 2011 BSD