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kernel: add "close" ctl message for tcp connection to gracefully hang up a connection without a tcp reset (used by go)

--- a/sys/src/9/ip/tcp.c

+++ b/sys/src/9/ip/tcp.c

@@ -3282,6 +3282,8 @@

 static char*

 tcpctl(Conv* c, char** f, int n)

 {

+	if(n == 1 && strcmp(f[0], "close") == 0)

+		return tcpclose(c), nil;

 	if(n == 1 && strcmp(f[0], "hangup") == 0)

 		return tcphangup(c);

 	if(n >= 1 && strcmp(f[0], "keepalive") == 0)