experimental threaded libc - kernel only

1 files changed, 69 insertions, 0 deletions

diff --git a/lib/libc_r/uthread/uthread_dup.c b/lib/libc_r/uthread/uthread_dup.c
new file mode 100644
index 00000000000..39d262d170b
--- /dev/null
+++ b/lib/libc_r/uthread/uthread_dup.c
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
+ * 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 John Birrell.
+ * 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 JOHN BIRRELL 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 <unistd.h>
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+#include "pthread_private.h"
+
+int
+dup(int fd)
+{
+	int             ret;
+
+	/* Lock the file descriptor: */
+	if ((ret = _FD_LOCK(fd, FD_RDWR, NULL)) == 0) {
+		/* Perform the 'dup' syscall: */
+		if ((ret = _thread_sys_dup(fd)) < 0) {
+		}
+		/* Initialise the file descriptor table entry: */
+		else if (_thread_fd_table_init(ret) != 0) {
+			/* Quietly close the file: */
+			_thread_sys_close(ret);
+
+			/* Reset the file descriptor: */
+			ret = -1;
+		} else {
+			/*
+			 * Save the file open flags so that they can be
+			 * checked later: 
+			 */
+			_thread_fd_table[ret]->flags = _thread_fd_table[fd]->flags;
+		}
+
+		/* Unlock the file descriptor: */
+		_FD_UNLOCK(fd, FD_RDWR);
+	}
+	/* Return the completion status: */
+	return (ret);
+}
+#endif