进程清理

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

void bye(void)
{
printf("That was all, folks\n");
}

int main(void)
{
long a;
int i;

a = sysconf(_SC_ATEXIT_MAX);
printf("ATEXIT_MAX = %ld\n", a);

i = atexit(bye);
if (i != 0) {
fprintf(stderr, "cannot set exit function\n");
exit(EXIT_FAILURE);
}

printf("end of main\n");
exit(EXIT_SUCCESS);
}