[musl] aio+fork bug test case

[musl] aio+fork bug test case

[Rich Felker]

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I'm cleaning up my work spaces and found this draft test case for the
aio+fork bug fixed in 34904d830a9fd1f6fc47218f38c111698303d2fe. I'm
not sure how best to integrate it with libc-test, but posting it here
now so it's not lost. Probably should be edited to use pipe() rather
than relying on stdin blocking.

Rich

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#include <aio.h>
#include <unistd.h>
#include <sys/wait.h>

int main()
{
	char buf[256];
	int fd = dup(0);
	struct aiocb cb = { .aio_fildes = fd, .aio_buf = buf, .aio_nbytes = sizeof buf };
	aio_read(&cb);

	pid_t pid = fork();
	if (!pid) {
		close(fd);
		_exit(0);
	}
	waitpid(pid, 0, 0);
}