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9gc: disable Nagle

--- a/9gc.c

+++ b/9gc.c

@@ -3,6 +3,7 @@

 #include <errno.h>

 #include <netdb.h>

 #include <netinet/in.h>

+#include <netinet/tcp.h>

 #include <stdarg.h>

 #include <stdio.h>

 #include <stdlib.h>

@@ -117,7 +118,7 @@

 {

 	struct addrinfo *r, *a, hint = {.ai_flags = AI_ADDRCONFIG, .ai_family = AF_UNSPEC, 0};

 	char host[64], *port;

-	int e, f;

+	int e, f, yes;

 	if (strncmp(s, "udp!", 4) == 0) {

 		hint.ai_socktype = SOCK_DGRAM;

@@ -143,11 +144,14 @@

 		return -1;

 	}

 	f = -1;

+	yes = 1;

 	for (a = r; a != NULL; a = a->ai_next) {

 		if ((f = socket(a->ai_family, a->ai_socktype, a->ai_protocol)) < 0)

 			continue;

-		if (connect(f, a->ai_addr, a->ai_addrlen) == 0)

+		if (connect(f, a->ai_addr, a->ai_addrlen) == 0) {

+			setsockopt(f, SOL_TCP, TCP_NODELAY, &yes, sizeof(yes));

 			break;

+		}

 		close(f);

 		f = -1;

 	}