commit 236691fb12e57db0a7ccd255c8027b6dfa1bd006
Author: mike <mike>
Date:   Sat Jun 1 18:37:46 2002 +0000

    Add POSIX.1-2001 WCONTINUED option for waitpid(2).  A proc flag
    (P_CONTINUED) is set when a stopped process receives a SIGCONT and
    cleared after it has notified a parent process that has requested
    notification via waitpid(2) with WCONTINUED specified in its options
    operand.  The status value can be checked with the new WIFCONTINUED()
    macro.
    
    Reviewed by:	jake

diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
index 9d1349a..8fb715a 100644
--- a/sys/kern/kern_exit.c
+++ b/sys/kern/kern_exit.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)kern_exit.c	8.7 (Berkeley) 2/12/94
- * $FreeBSD: src/sys/kern/kern_exit.c,v 1.165 2002/05/23 04:12:28 jhb Exp $
+ * $FreeBSD: src/sys/kern/kern_exit.c,v 1.166 2002/06/01 18:37:45 mike Exp $
  */
 
 #include "opt_compat.h"
@@ -505,7 +505,7 @@ wait1(td, uap, compat)
 		uap->pid = -q->p_pgid;
 		PROC_UNLOCK(q);
 	}
-	if (uap->options &~ (WUNTRACED|WNOHANG|WLINUXCLONE))
+	if (uap->options &~ (WUNTRACED|WNOHANG|WCONTINUED|WLINUXCLONE))
 		return (EINVAL);
 	mtx_lock(&Giant);
 loop:
@@ -688,6 +688,22 @@ loop:
 			mtx_unlock(&Giant);
 			return (error);
 		}
+		if (uap->options & WCONTINUED && (p->p_flag & P_CONTINUED)) {
+			sx_xunlock(&proctree_lock);
+			td->td_retval[0] = p->p_pid;
+			p->p_flag &= ~P_CONTINUED;
+			PROC_UNLOCK(p);
+
+			if (uap->status) {
+				status = SIGCONT;
+				error = copyout((caddr_t)&status,
+				    (caddr_t)uap->status, sizeof(status));
+			} else
+				error = 0;
+
+			mtx_unlock(&Giant);
+			return (error);
+		}
 		PROC_UNLOCK(p);
 	}
 	if (nfound == 0) {
diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c
index b711171..0177748 100644
--- a/sys/kern/kern_sig.c
+++ b/sys/kern/kern_sig.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)kern_sig.c	8.7 (Berkeley) 4/18/94
- * $FreeBSD: src/sys/kern/kern_sig.c,v 1.166 2002/05/29 23:44:31 julian Exp $
+ * $FreeBSD: src/sys/kern/kern_sig.c,v 1.167 2002/06/01 18:37:45 mike Exp $
  */
 
 #include "opt_compat.h"
@@ -1436,6 +1436,8 @@ psignal(p, sig)
 					}
 				}
 			} else {
+				p->p_flag |= P_CONTINUED;
+				wakeup((caddr_t)p->p_pptr);
 				if (td->td_wchan == NULL)
 					goto run;
 				p->p_stat = SSLEEP;
diff --git a/sys/sys/proc.h b/sys/sys/proc.h
index d8cafac..0b4c538 100644
--- a/sys/sys/proc.h
+++ b/sys/sys/proc.h
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)proc.h	8.15 (Berkeley) 5/19/95
- * $FreeBSD: src/sys/sys/proc.h,v 1.221 2002/05/19 00:14:50 jhb Exp $
+ * $FreeBSD: src/sys/sys/proc.h,v 1.222 2002/06/01 18:37:46 mike Exp $
  */
 
 #ifndef _SYS_PROC_H_
@@ -486,6 +486,7 @@ struct proc {
 #define	P_WEXIT		0x02000	/* Working on exiting. */
 #define	P_EXEC		0x04000	/* Process called exec. */
 #define	P_KSES		0x08000	/* Process is using KSEs. */
+#define	P_CONTINUED	0x10000	/* Proc has continued from a stopped state. */
 
 /* Should be moved to machine-dependent areas. */
 #define	P_UNUSED100000	0x100000
diff --git a/sys/sys/wait.h b/sys/sys/wait.h
index 8dc0647..76a6607 100644
--- a/sys/sys/wait.h
+++ b/sys/sys/wait.h
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)wait.h	8.2 (Berkeley) 7/10/94
- * $FreeBSD: src/sys/sys/wait.h,v 1.13 2002/05/27 00:55:17 mike Exp $
+ * $FreeBSD: src/sys/sys/wait.h,v 1.14 2002/06/01 18:37:46 mike Exp $
  */
 
 #ifndef _SYS_WAIT_H_
@@ -61,6 +61,7 @@
 #define WTERMSIG(x)	(_WSTATUS(x))
 #define WIFEXITED(x)	(_WSTATUS(x) == 0)
 #define WEXITSTATUS(x)	(_W_INT(x) >> 8)
+#define	WIFCONTINUED(x)	(x == 0x13)	/* 0x13 == SIGCONT */
 #ifndef _POSIX_SOURCE
 #define WCOREDUMP(x)	(_W_INT(x) & WCOREFLAG)
 
@@ -79,6 +80,7 @@
  */
 #define WNOHANG		1	/* don't hang in wait */
 #define WUNTRACED	2	/* tell about stopped, untraced children */
+#define	WCONTINUED	4	/* Report a job control continued process. */
 #define WLINUXCLONE     0x80000000       /* wait for kthread spawned from linux_clone */
 
 #ifndef _POSIX_SOURCE