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ndb/dns: procgetname(): use /proc instead of #p

--- a/sys/src/cmd/ndb/dnresolve.c

+++ b/sys/src/cmd/ndb/dnresolve.c

@@ -75,8 +75,8 @@

 	char *lp, *rp;

 	char buf[256];

-	snprint(buf, sizeof buf, "#p/%d/args", getpid());

-	if((fd = open(buf, OREAD)) < 0)

+	snprint(buf, sizeof buf, "/proc/%d/args", getpid());

+	if((fd = open(buf, OREAD|OCEXEC)) < 0)

 		return strdup("");

 	*buf = '\0';

 	n = read(fd, buf, sizeof buf-1);