SIOCOUTQNSD (reference) in projects: linux-6.1.9

110 #define SIOCOUTQNSD	0x894B		/* output queue size (not sent only) */  macro

3396 	case SIOCOUTQNSD:  in compat_sock_ioctl_trans()

3531 	case SIOCOUTQNSD:  in mptcp_ioctl()

/linux-6.1.9/include/uapi/linux/
D	sockios.h	`110 #define SIOCOUTQNSD 0x894B /* output queue size (not sent only) */ macro`
/linux-6.1.9/tools/testing/selftests/net/mptcp/
D	mptcp_inq.c	`214 ret = ioctl(fd, SIOCOUTQNSD, &nsd); in wait_for_ack()`
/linux-6.1.9/net/
D	socket.c	`3396 case SIOCOUTQNSD: in compat_sock_ioctl_trans()`
/linux-6.1.9/net/smc/
D	af_smc.c	`3077 case SIOCOUTQNSD: in smc_ioctl()`
/linux-6.1.9/net/mptcp/
D	protocol.c	`3531 case SIOCOUTQNSD: in mptcp_ioctl()`
/linux-6.1.9/net/ipv4/
D	tcp.c	`627 case SIOCOUTQNSD: in tcp_ioctl()`