open("/dev/sg0", O_RDONLY | O_NONBLOCK) /* check device, EBUSY means some other process has O_EXCL lock on it */ /* when the device you want is found then ... */ flags = fcntl(sg_fd, F_GETFL) fcntl(sg_fd, F_SETFL, flags & (~ O_NONBLOCK)) /* since, with simple apps, it is easier to use normal blocked io */ |
sigemptyset(&sig_set) sigaddset(&sig_set, SIGPOLL) sigaction(SIGPOLL, &s_action, 0) fcntl(sg_fd, F_SETOWN, getpid()) flags = fcntl(sg_fd, F_GETFL); fcntl(sg_fd, F_SETFL, flags | O_ASYNC) |