#define _POSIX_C_SOURCE 1 /* sigaction, sigaction() */
#define _DARWIN_C_SOURCE 1 /* SIGWINCH on OS X */
#define _POSIX_C_SOURCE 1 /* sigaction, sigaction() */
#define _DARWIN_C_SOURCE 1 /* SIGWINCH on OS X */
#include <signal.h> /* SIGWINCH, sigaction, sigaction() */
#include <stddef.h> /* NULL */
#include <stdlib.h> /* exit() */
#include <signal.h> /* SIGWINCH, sigaction, sigaction() */
#include <stddef.h> /* NULL */
#include <stdlib.h> /* exit() */