Reviewed by: Russell Carter

Submitted by:	"Richard Seaman, Jr." <dick@tar.com>

Native FreeBSD port of the linuxthreads library
Includes added files and stuff you need to add to the rest of your system.
This is for -current  I'm sure Richard's older version might be
a good place to start for a 3.x version.

1 files changed, 91 insertions, 0 deletions

diff --git a/devel/linuxthreads/files/lclone.c b/devel/linuxthreads/files/lclone.c
new file mode 100644
index 000000000000..9db77024c045
--- /dev/null
+++ b/devel/linuxthreads/files/lclone.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 1999 Richard Seaman, Jr.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by Richard Seaman, Jr.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY RICHARD SEAMAN, Jr. AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+
+#include <sys/types.h>
+#include <sys/signal.h>
+#include <sys/unistd.h>
+#include <errno.h>
+#include <clone.h>
+
+#pragma weak clone=__clone
+
+extern int __clone __P ((int (*__fn) (void *), void *__child_stack,
+			 int __flags, void *__arg))
+{
+	int bsd_flags;
+	int exit_signal;
+
+	/* We don't have qn equivalent to CLONE_PID yet */
+	if (__flags & CLONE_PID)
+		return (EINVAL);
+
+	if (__child_stack == (void *)0)
+		return (EINVAL);
+
+	/* RFTHREAD probably not necessary here, but it shouldn't hurt either */
+	bsd_flags = RFPROC | RFTHREAD;
+
+	/* We only allow one alternative to SIGCHLD, and thats
+	 * SIGUSR1.  This is less flexible than Linux, but
+	 * we don't really have a way to pass a one byte
+	 * exit signal to rfork, which is what Linux passes to
+	 * its clone syscall.  OTOH, we haven't seen Linux use
+	 * a value other than 0 (which implies SIGCHLD), SIGCHLD,
+	 * or SIGUSER1 so far.
+	 */
+	exit_signal = ((unsigned int)__flags) & CSIGNAL;
+	switch (exit_signal){
+	case 0:
+	case SIGCHLD:
+		/* SIGCHLD is the default for BSD, so we don't have
+		 * to do anything special in this case.
+		 */
+		break;
+	case SIGUSR1:
+		bsd_flags |= RFLINUXTHPN;
+		break;
+	default:
+		return (EINVAL);
+	}
+
+	if (__flags & CLONE_VM)
+		bsd_flags |= RFMEM;
+	if (__flags & CLONE_SIGHAND)
+		bsd_flags |= RFSIGSHARE;
+	if (!(__flags & CLONE_FILES))
+		bsd_flags |= RFFDG;
+
+	/* _clone is in clone.S, and takes bsd style rfork flags */
+	return (_clone (__fn, __child_stack, bsd_flags,  __arg));
+}