Dockerfile and C program to demonstrate container pausing.

Dockerfile

FROM alpine:latest AS builder

WORKDIR /
COPY pause.c .
RUN apk add --no-cache gcc libc-dev && \
    gcc -o pause pause.c

FROM alpine:latest

WORKDIR /
COPY --from=builder /pause .

ENTRYPOINT [ "./pause" ]

pause.c

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

int main
(int argc, char ** argv, char ** envp)
{
    for (int i = 0; ; i++) {
        printf("\rCount at %i", i);
        fflush(stdout);
        sleep(1);
    }
    return 0;
}