IPPROTO_TCP       325 daemons/execd/remoted_tls.c     hints.ai_protocol = IPPROTO_TCP;
IPPROTO_TCP      1144 lib/common/remote.c         sock = socket(rp->ai_family, SOCK_STREAM, IPPROTO_TCP);
IPPROTO_TCP        31 maint/gnulib/tests/socket-client.h   client_socket = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
IPPROTO_TCP        34 maint/gnulib/tests/socket-server.h   server = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);