bool qemu_signalfd_available(void)
{
#ifdef CONFIG_SIGNALFD
+ sigset_t mask;
+ int fd;
+ bool ok;
+ sigemptyset(&mask);
errno = 0;
- syscall(SYS_signalfd, -1, NULL, _NSIG / 8);
- return errno != ENOSYS;
+ fd = syscall(SYS_signalfd, -1, &mask, _NSIG / 8);
+ ok = (errno != ENOSYS);
+ if (fd >= 0) {
+ close(fd);
+ }
+ return ok;
#else
return false;
#endif