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venti/srv: open /proc instead of #p

--- a/sys/src/cmd/venti/srv/hproc.c

+++ b/sys/src/cmd/venti/srv/hproc.c

@@ -36,7 +36,7 @@

 	}

 	memset(&debug.fhdr, 0, sizeof debug.fhdr);

-	snprint(buf, sizeof buf, "#p/%d/text", pid);

+	snprint(buf, sizeof buf, "/proc/%d/text", pid);

 	fd = open(buf, OREAD);

 	if(fd < 0)

 		return -1;

@@ -72,7 +72,7 @@

 	char buf[100];

 	Map *m;

-	snprint(buf, sizeof buf, "#p/%d/mem", pid);

+	snprint(buf, sizeof buf, "/proc/%d/mem", pid);

 	mem = open(buf, OREAD);

 	if(mem < 0)

 		return nil;

@@ -106,7 +106,7 @@

 	char buf[4096];

 	int fd, n;

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

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

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

 		dprint("open %s: %r\n", buf);

 		return;