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rdbfs: add -s srvname (from charles forsyth's rdbfs-srvname patch)

Add a -s srvname option to rdbfs, allowing debugging sessions to be shared
or later reattached after disconnection.

--- a/sys/man/4/rdbfs

+++ b/sys/man/4/rdbfs

@@ -11,6 +11,10 @@

 .I pid

 ]

 [

+.B -s

+.I srvname

+]

+[

 .B -t

 .I text

 ]

@@ -28,6 +32,15 @@

 .I device

 (default 

 .BR /dev/eia0 ).

+If the

+.B -s

+option is given,

+.I rdbfs

+will post its channel in

+.BI /srv/ srvname

+(see

+.IR srv (3)),

+allowing the session to be shared or reattached later.

 .PP

 The 

 .B text

--- a/sys/src/cmd/rdbfs.c

+++ b/sys/src/cmd/rdbfs.c

@@ -137,12 +137,13 @@

 char*	portname = "/dev/eia0";

 char*	textfile = "/386/9pc";

 char*	procname = "1";

+char*	srvname;

 Channel* rchan;

 void

 usage(void)

 {

-	fprint(2, "usage: rdbfs [-p procnum] [-t textfile] [serialport]\n");

+	fprint(2, "usage: rdbfs [-p procnum] [-s srvname] [-t textfile] [serialport]\n");

 	exits("usage");

 }

@@ -397,6 +398,9 @@

 	case 'p':

 		procname = EARGF(usage());

 		break;

+	case 's':

+		srvname = EARGF(usage());

+		break;

 	case 't':

 		textfile = EARGF(usage());

 		break;

@@ -427,7 +431,7 @@

 	for(i=0; i<nelem(tab); i++)

 		closefile(createfile(dir, tab[i].s, "rdbfs", tab[i].mode, (void*)tab[i].id));

 	closefile(dir);

-	threadpostmountsrv(&fs, nil, "/proc", MBEFORE);

+	threadpostmountsrv(&fs, srvname, "/proc", MBEFORE);

 	exits(0);

 }