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aux/listen1: allow alternative namespace when running as user none with -n option

--- a/sys/man/8/listen

+++ b/sys/man/8/listen

@@ -20,6 +20,8 @@

 ]

 .RB [ -p

 .IR maxprocs ]

+.RB [ -n

+.IR namespace ]

 .I addr

 .I cmd

 [

--- a/sys/src/cmd/aux/listen1.c

+++ b/sys/src/cmd/aux/listen1.c

@@ -5,6 +5,7 @@

 int maxprocs;

 int verbose;

 int trusted;

+char *nsfile;

 void

 usage(void)

@@ -22,7 +23,7 @@

 	if(fd < 0 || write(fd, "none", strlen("none")) < 0)

 		sysfatal("can't become none: %r");

 	close(fd);

-	if(newns("none", nil) < 0)

+	if(newns("none", nsfile) < 0)

 		sysfatal("can't build namespace: %r");

 }

@@ -68,6 +69,9 @@

 		break;

 	case 'p':

 		maxprocs = atoi(EARGF(usage()));

+		break;

+	case 'n':

+		nsfile = EARGF(usage());

 		break;

 	}ARGEND