TURBO C: signal(SIGINT, ) works only for 1 Ctrl-Break?

[marwk at levels.sait.edu.au]

In the TURBO C 2.0 reference manual on page 346 thre is an example of using
signal() to divert the CTRL-BREAK exception to a user-defined routine.

I entered the following code and it works the first time that ^Break is
pressed, but then the program aborts the next time I press ^Break again.

Does the signal get used up each time it is used?

#include <stdio.h>
#include <signal.h>
#include <conio.h>

void gotcha(int sig)
    {
    printf("Ctrl-Break has been disabled - Press any key to continue\n");
    fflush(stdin);
    getch();
    }

void main(void)
    {
    signal(SIGINT, gotcha);
    printf("OK, go on, just you try to interrupt me!\n");

    while (1)
        printf("a");
    }

Thank you.

Ray