static void *sigwait_compat(void *opaque) { struct sigfd_compat_info *info = opaque; int err; sigset_t all; sigfillset(&all); sigprocmask(SIG_BLOCK, &all, NULL); do { siginfo_t siginfo; err = sigwaitinfo(&info->mask, &siginfo); if (err == -1 && errno == EINTR) { err = 0; continue; } if (err > 0) { char buffer[128]; size_t offset = 0; memcpy(buffer, &err, sizeof(err)); while (offset < sizeof(buffer)) { ssize_t len; len = write(info->fd, buffer + offset, sizeof(buffer) - offset); if (len == -1 && errno == EINTR) continue; if (len <= 0) { err = -1; break; } offset += len; } } } while (err >= 0); return NULL; }