9os

commit d0f313465a85ed49e1d3d8866f70de0f473a0912
parent b1ba512aa22afc8e52a4eb0593b5c8da4d5db276
Author: Roberto E. Vargas Caballero <roberto.vargas@midokura.com>
Date:   Wed, 16 Nov 2022 19:06:19 +0100

os9: Add /proc/cur file

This file always points to the current process.

Diffstat:
M
src/os9/dev/devproc.c
 | 
40
+++++++++++++++++++++++-----------------

1 file changed, 23 insertions(+), 17 deletions(-)
diff --git a/src/os9/dev/devproc.c b/src/os9/dev/devproc.c
@@ -27,26 +27,32 @@ static int
 procfsgen(Chan *c, Dirtab *tab, int ntab, int n, Dir *dir)
 {
 	Task *tp;
-	int ret = 0;
 	char nam[NAMELEN];
 
-	n = getntask(n, &tp);
-	if (n <= 0)
+	switch (n) {
+	case NR_TASKS:
+		mkentry(c, dir,
+		        "cur", 0,
+		        QID(CHDIR, 0, PATH(Qtaskdir, proc->tid)),
+		        O_READ);
+		return 1;
+	case NR_TASKS+1:
 		return -1;
-	if (tp->tid == -1)
-		goto novalid;
-
-	ksnprint(nam, NAMELEN, "%d", tp->tid);
-	mkentry(c, dir,
-		nam, 0,
-		QID(CHDIR, 0, PATH(Qtaskdir, tp->tid)),
-	        O_READ);
-	ret = 1;
-
-novalid:
-	unlock(&tp->m);
-
-	return ret;
+	default:
+		n = getntask(n, &tp);
+		if (n < 0)
+			return -1;
+		if (n == 0)
+			return 0;
+
+		ksnprint(nam, NAMELEN, "%d", tp->tid);
+		mkentry(c, dir,
+			nam, 0,
+			QID(CHDIR, 0, PATH(Qtaskdir, tp->tid)),
+		        O_READ);
+		unlock(&tp->m);
+		return 1;
+	}
 }
 
 static int