+ struct args args = { .sev = sev };
+ pthread_attr_t attr;
+ pthread_t td;
+ int s;
+ struct sigevent sev2;
+ static const char zeros[32];
+
+ if (!sev || sev->sigev_notify != SIGEV_THREAD)
+ return syscall(SYS_mq_notify, mqd, sev);
+
+ s = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, 0);
+ if (s < 0) return -1;
+ args.sock = s;
+
+ if (sev->sigev_notify_attributes) attr = *sev->sigev_notify_attributes;
+ else pthread_attr_init(&attr);
+ pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+ pthread_barrier_init(&args.barrier, 0, 2);
+
+ if (pthread_create(&td, &attr, start, &args)) {
+ __syscall(SYS_close, s);
+ errno = EAGAIN;
+ return -1;
+ }
+
+ pthread_barrier_wait(&args.barrier);
+ pthread_barrier_destroy(&args.barrier);
+
+ sev2.sigev_notify = SIGEV_THREAD;
+ sev2.sigev_signo = s;
+ sev2.sigev_value.sival_ptr = (void *)&zeros;
+
+ if (syscall(SYS_mq_notify, mqd, &sev2) < 0) {
+ pthread_cancel(td);
+ __syscall(SYS_close, s);
+ return -1;
+ }
+
+ return 0;