Adds -n flag to enable printing note group.

Reference: /n/sources/patch/maybe/ps-note-group
Date: Mon Sep 26 03:09:44 CES 2011
Signed-off-by: lyndon@orthanc.ca

--- /sys/src/cmd/ps.c	Mon Sep 26 03:08:06 2011
+++ /sys/src/cmd/ps.c	Mon Sep 26 03:07:10 2011
@@ -9,6 +9,7 @@
 Biobuf	bout;
 int	pflag;
 int	aflag;
+int nflag;
 int	rflag;
 
 void
@@ -22,6 +23,8 @@
 	case 'a':
 		aflag++;
 		break;
+	case 'n':
+		nflag++;
 	case 'p':
 		pflag++;
 		break;
@@ -59,8 +62,8 @@
 ps(char *s)
 {
 	ulong utime, stime, rtime, size;
-	int argc, basepri, fd, i, n, pri;
-	char args[256], *argv[16], buf[64], pbuf[8], rbuf[20], rbuf1[20], status[4096];
+	int argc, basepri, fd, i, n, pri, noteid=0;
+	char args[256], *argv[16], buf[64], nbuf[13], pbuf[8], rbuf[20], rbuf1[20], status[4096];
 
 	sprint(buf, "%s/status", s);
 	fd = open(buf, OREAD);
@@ -89,6 +92,23 @@
 	stime = strtoul(argv[4], 0, 0)/1000;
 	rtime = strtoul(argv[5], 0, 0)/1000;
 	size  = strtoul(argv[9], 0, 0);
+	if(nflag){
+		sprint(buf, "%s/noteid", s);
+		fd = open(buf, OREAD);
+		if(fd >= 0) {
+			n = read(fd, buf, sizeof buf);
+			close(fd);
+			if(n > 0){
+				noteid = atoi(buf);
+			}
+		}
+		if(fd >= 0 && n > 0)
+			snprint(nbuf, sizeof nbuf, " %7ud", noteid);
+		else
+			snprint(nbuf, sizeof nbuf, " %7s", "?");
+	}else
+		nbuf[0] = 0;
+			
 	if(pflag){
 		basepri = strtoul(argv[10], 0, 0);
 		pri = strtoul(argv[11], 0, 0);
@@ -107,9 +127,10 @@
 	}else
 		rbuf1[0] = 0;
 
-	Bprint(&bout, "%-10s %8s%s %4lud:%.2lud %3lud:%.2lud %s %7ludK %-8.8s ",
+	Bprint(&bout, "%-10s %8s%s%s %4lud:%.2lud %3lud:%.2lud %s %7ludK %-8.8s ",
 			argv[1],
 			s,
+			nbuf,
 			rbuf1,
 			utime/60, utime%60,
 			stime/60, stime%60,
--- /sys/man/1/ps	Mon Sep 26 03:08:29 2011
+++ /sys/man/1/ps	Mon Sep 26 03:08:23 2011
@@ -4,12 +4,12 @@
 .SH SYNOPSIS
 .B ps
 [
-.B -apr
+.B -anpr
 ]
 .PP
 .B psu
 [
-.B -apr
+.B -anpr
 ]
 [
 .I user
@@ -81,6 +81,12 @@
 waiting for more of a critical
 .IR resource .
 .PD
+.PP
+The
+.B -n
+flag causes
+.I ps
+to print, after the process id, the note group to which the process belongs.
 .PP
 The
 .B -r