9os

commit d120ce85422a76ce88a6f9be7d5123bc42bb21b5
parent e17ee6612569013d56858cba4c0bb1d4d8d94ea7
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Sun, 25 Oct 2020 22:47:38 +0100

os9/proc: Add rfork()

Change-Id: I627931dd9348c0d212ca046b87702c30b7f9564f

Diffstat:
M
src/os9/proc.c
 | 
26
++++++++++----------------

1 file changed, 10 insertions(+), 16 deletions(-)
diff --git a/src/os9/proc.c b/src/os9/proc.c
@@ -146,31 +146,21 @@ int
 rfork(int flags)
 {
 	Task *tp, *parent;
-	int tid;
 
 	tp = parent = task;
 
-	if ((flags & (RFPROC|RFMEM))  == RFPROC|RFMEM
-	||   (flags & (RFNAMEG|RFCNAMEG))  == RFNAMEG|RFCNAMEG
-	||   (flags & (RFFDG|RFCFDG))  == RFFDG|RFCFDG) {
+	if ((flags & (RFPROC|RFMEM))  == (RFPROC|RFMEM)
+	||   (flags & (RFNAMEG|RFCNAMEG))  == (RFNAMEG|RFCNAMEG)
+	||   (flags & (RFFDG|RFCFDG))  == (RFFDG|RFCFDG)) {
 		errno = EINVAL;
 		return -1;
 	}
 
 	if ((flags & RFPROC) != 0) {
 		if ((tp = newslot()) == NULL)
-			return -1;
-
-		for (tp = tasktab; tp < &tasktab[NR_TASKS]; ++tp) {
-			if (tp->mode == PDISABLED)
-				break;
-		}
-
-		if (tp == &tasktab[NR_TASKS] || (tid = newtid()) < 0) {
-			errno = ENOMEM;
-			return -1;
-		}
-		tp->tid = tid;
+			goto enomem;
+		if ((tp->tid = newtid()) < 0)
+			goto enomem;
 
 		incref(&parent->text->ref);
 		tp->text = parent->text;
@@ -215,4 +205,8 @@ rfork(int flags)
 	}
 
 	return (flags & RFPROC) ? tp->tid : 0;
+
+enomem:
+	errno = ENOMEM;
+	return -1;
 }