PERFORCE change 106538 for review

[Roman Divacky]

http://perforce.freebsd.org/chv.cgi?CH=106538

Change 106538 by rdivacky at rdivacky_witten on 2006/09/23 08:54:44

	Implement CLONE_VFORK semantics for clone().

Affected files ...

.. //depot/projects/linuxolator/src/sys/amd64/linux32/linux.h#5 edit
.. //depot/projects/linuxolator/src/sys/amd64/linux32/linux32_machdep.c#3 edit
.. //depot/projects/linuxolator/src/sys/i386/linux/linux.h#4 edit
.. //depot/projects/linuxolator/src/sys/i386/linux/linux_machdep.c#2 edit

Differences ...

==== //depot/projects/linuxolator/src/sys/amd64/linux32/linux.h#5 (text+ko) ====

@@ -831,6 +831,7 @@
 #define CLONE_FILES     0x400
 #define CLONE_SIGHAND   0x800
 #define CLONE_PID       0x1000          /* this flag does not exist in linux anymore */
+#define CLONE_VFORK     0x4000
 #define CLONE_PARENT    0x00008000
 #define CLONE_THREAD    0x10000
 #define CLONE_SETTLS    0x80000

==== //depot/projects/linuxolator/src/sys/amd64/linux32/linux32_machdep.c#3 (text+ko) ====

@@ -701,6 +701,15 @@
 
 	td->td_retval[0] = p2->p_pid;
 	td->td_retval[1] = 0;
+	
+	if (args->flags & CLONE_VFORK) {
+   	   	/* wait for the children to exit, ie. emulate vfork */
+   	   	PROC_LOCK(p2);
+		while (p2->p_flag & P_PPWAIT)
+   		   	msleep(td->td_proc, &p2->p_mtx, PWAIT, "ppwait", 0);
+		PROC_UNLOCK(p2);
+	}
+
 	return (0);
 }
 

==== //depot/projects/linuxolator/src/sys/i386/linux/linux.h#4 (text+ko) ====

@@ -794,6 +794,7 @@
 #define CLONE_FILES     0x400
 #define CLONE_SIGHAND   0x800
 #define CLONE_PID       0x1000          /* this flag does not exist in linux anymore */
+#define CLONE_VFORK	0x4000
 #define CLONE_PARENT    0x00008000
 #define CLONE_THREAD    0x10000
 #define CLONE_SETTLS    0x80000

==== //depot/projects/linuxolator/src/sys/i386/linux/linux_machdep.c#2 (text+ko) ====

@@ -524,6 +524,15 @@
 
 	td->td_retval[0] = p2->p_pid;
 	td->td_retval[1] = 0;
+
+	if (args->flags & CLONE_VFORK) {
+   	   	/* wait for the children to exit, ie. emulate vfork */
+   	   	PROC_LOCK(p2);
+		while (p2->p_flag & P_PPWAIT)
+   		   	msleep(td->td_proc, &p2->p_mtx, PWAIT, "ppwait", 0);
+		PROC_UNLOCK(p2);
+	}
+
 	return (0);
 }