Function can_read_t

test/defer-taskrun.c:22–33

#define EXEC_FILESIZE (1U<<20)

static bool can_read_t(int fd, int time)
{
	int ret;
	struct pollfd p = {
		.fd = fd,
		.events = POLLIN,
	};

	ret = poll(&p, 1, time);

	return ret == 1;
}

static bool can_read(int fd)
{