SIGURG
#ifdef SIGURG
if (signal(SIGURG, myoob) == SIG_ERR)
[SIGURG] = "URG",
[SIGURG] = "Urgent I/O condition",
sigaddset(&newmask, SIGURG);
[SIGURG] = "SIGURG",
SIGURG, /* LINUX_SIGURG */
[SIGURG] = SIGPROP_IGNORE,
pgsigio(&so->so_sigio, SIGURG, 0);
#define RCTL_ACTION_SIGURG SIGURG
signal(SIGURG, hand);