xnu-344.tar.gz

[apple/xnu.git] / bsd / kern / kern_proc.c

diff --git a/bsd/kern/kern_proc.c b/bsd/kern/kern_proc.c
index e040cd76eab9a2fb5b0ce67870276eef936b539e..97f98cc1d370a27362e5326812ac7b4543695c4b 100644 (file)
--- a/bsd/kern/kern_proc.c
+++ b/bsd/kern/kern_proc.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
@@ -167,6 +167,23 @@ inferior(p)
                        return (0);
        return (1);
 }
+/*
+ * Is p an inferior of t ?
+ */
+int
+isinferior(p, t)
+       register struct proc *p;
+       register struct proc *t;
+{
+
+       /* if p==t they are not inferior */
+       if (p == t)
+               return(0);
+       for (; p != t; p = p->p_pptr)
+               if (p->p_pid == 0)
+                       return (0);
+       return (1);
+}
 
 /*
  * Locate a process by number
@@ -231,8 +248,10 @@ enterpgrp(p, pgid, mksess)
 #endif
                MALLOC_ZONE(pgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP,
                    M_WAITOK);
-               if ((np = pfind(savepid)) == NULL || np != p)
+               if ((np = pfind(savepid)) == NULL || np != p) {
+                       FREE_ZONE(pgrp, sizeof(struct pgrp), M_PGRP);
                        return (ESRCH);
+               }
                if (mksess) {
                        register struct session *sess;
 
@@ -242,6 +261,7 @@ enterpgrp(p, pgid, mksess)
                        MALLOC_ZONE(sess, struct session *,
                                sizeof(struct session), M_SESSION, M_WAITOK);
                        sess->s_leader = p;
+                       sess->s_sid = p->p_pid;
                        sess->s_count = 1;
                        sess->s_ttyvp = NULL;
                        sess->s_ttyp = NULL;