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rio: simplify filsysinit() by using getuser(), format pid's as ulongs

--- a/sys/src/cmd/rio/fsys.c

+++ b/sys/src/cmd/rio/fsys.c

@@ -118,10 +118,9 @@

 Filsys*

 filsysinit(Channel *cxfidalloc)

 {

-	int n, fd, pid, p0;

+	int p0;

 	Filsys *fs;

 	Channel *c;

-	char buf[128];

 	fs = emalloc(sizeof(Filsys));

 	if(cexecpipe(&fs->cfd, &fs->sfd) < 0)

@@ -128,20 +127,11 @@

 		goto Rescue;

 	fmtinstall('F', fcallfmt);

 	clockfd = open("/dev/time", OREAD|OCEXEC);

-	fd = open("/dev/user", OREAD);

-	strcpy(buf, "Jean-Paul_Belmondo");

-	if(fd >= 0){

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

-		if(n > 0)

-			buf[n] = 0;

-		close(fd);

-	}

-	fs->user = estrdup(buf);

+	fs->user = getuser();

 	fs->csyncflush = chancreate(sizeof(int), 0);

 	if(fs->csyncflush == nil)

 		error("chancreate syncflush");

 	fs->cxfidalloc = cxfidalloc;

-	pid = getpid();

 	/*

 	 * Create and post wctl pipe

@@ -148,7 +138,7 @@

 	 */

 	if(cexecpipe(&p0, &wctlfd) < 0)

 		goto Rescue;

-	snprint(srvwctl, sizeof(srvwctl), "/srv/riowctl.%s.%d", fs->user, pid);

+	snprint(srvwctl, sizeof(srvwctl), "/srv/riowctl.%s.%lud", fs->user, (ulong)getpid());

 	post(srvwctl, "wctl", p0);

 	close(p0);

@@ -165,7 +155,7 @@

 	/*

 	 * Post srv pipe

 	 */

-	snprint(srvpipe, sizeof(srvpipe), "/srv/rio.%s.%d", fs->user, pid);

+	snprint(srvpipe, sizeof(srvpipe), "/srv/rio.%s.%lud", fs->user, (ulong)getpid());

 	post(srvpipe, "wsys", fs->cfd);

 	return fs;

@@ -234,7 +224,7 @@

 	char buf[32];

 	close(fs->sfd);	/* close server end so mount won't hang if exiting */

-	sprint(buf, "%d", id);

+	snprint(buf, sizeof buf, "%d", id);

 	if(mount(fs->cfd, -1, "/mnt/wsys", MREPL, buf) == -1){

 		fprint(2, "mount failed: %r\n");

 		return -1;