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ip/pptpd: don't mess with ipifc (handled by ppp), slay note gorup on exit

--- a/sys/src/cmd/ip/pptpd.c

+++ b/sys/src/cmd/ip/pptpd.c

@@ -237,6 +237,7 @@

 	syslog(0, LOG, ": src=%I: server exits", srv.remote);

+	postnote(PNGROUP, getpid(), "die");

 	exits(0);

 }

@@ -626,8 +627,8 @@

 {

 	uint h;

 	Call *c;

-	char buf[300], *argv[30], local[20], remote[20], **p;

-	int fd, pfd[2], n;

+	char *argv[30], local[20], remote[20], **p;

+	int pfd[2];

 	h = id%Nhash;

@@ -646,16 +647,6 @@

 	if(pipe(pfd) < 0)

 		myfatal("callalloc: pipe failed: %r");

-

-	sprint(buf, "%s/ipifc/clone", srv.pppdir);

-	fd = open(buf, OWRITE);

-	if(fd < 0)

-		myfatal("callalloc: could not open %s: %r", buf);

-

-	n = sprint(buf, "iprouting");

-	if(write(fd, buf, n) < n)

-		myfatal("callalloc: write to ifc failed: %r");

-	close(fd);

 	p = argv;

 	*p++ = srv.pppexec;