experimental threaded libc - kernel only

1 files changed, 142 insertions, 0 deletions

diff --git a/lib/libpthread/uthread/uthread_fcntl.c b/lib/libpthread/uthread/uthread_fcntl.c
new file mode 100644
index 00000000000..eecda60d8ae
--- /dev/null
+++ b/lib/libpthread/uthread/uthread_fcntl.c
@@ -0,0 +1,142 @@
+/*
+ * 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 <stdarg.h>
+#include <unistd.h>
+#include <fcntl.h>
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+#include "pthread_private.h"
+
+int
+fcntl(int fd, int cmd,...)
+{
+	int             flags = 0;
+	int		nonblock;
+	int             oldfd;
+	int             ret;
+	int             status;
+	va_list         ap;
+
+	/* Lock the file descriptor: */
+	if ((ret = _FD_LOCK(fd, FD_RDWR, NULL)) == 0) {
+		/* Initialise the variable argument list: */
+		va_start(ap, cmd);
+
+		/* Process according to file control command type: */
+		switch (cmd) {
+		/* Duplicate a file descriptor: */
+		case F_DUPFD:
+			/*
+			 * Get the file descriptor that the caller wants to
+			 * use: 
+			 */
+			oldfd = va_arg(ap, int);
+
+			/* Initialise the file descriptor table entry: */
+			if ((ret = _thread_sys_fcntl(fd, cmd, oldfd)) < 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;
+			}
+			break;
+		case F_SETFD:
+			flags = va_arg(ap, int);
+			ret = _thread_sys_fcntl(fd, cmd, flags);
+			break;
+		case F_GETFD:
+			ret = _thread_sys_fcntl(fd, cmd, 0);
+			break;
+		case F_GETFL:
+			ret = _thread_fd_table[fd]->flags;
+			break;
+		case F_SETFL:
+			/*
+			 * Get the file descriptor flags passed by the
+			 * caller:
+			 */
+			flags = va_arg(ap, int);
+
+			/*
+			 * Check if the user wants a non-blocking file
+			 * descriptor:
+			 */
+			nonblock = flags & O_NONBLOCK;
+
+			/* Set the file descriptor flags: */
+			if ((ret = _thread_sys_fcntl(fd, cmd, flags | O_NONBLOCK)) != 0) {
+
+			/* Get the flags so that we behave like the kernel: */
+			} else if ((flags = _thread_sys_fcntl(fd,
+			    F_GETFL, 0)) == -1) {
+				/* Error getting flags: */
+				ret = -1;
+
+			/*
+			 * Check if the file descriptor is non-blocking
+			 * with respect to the user:
+			 */
+			} else if (nonblock)
+				/* A non-blocking descriptor: */
+				_thread_fd_table[fd]->flags = flags | O_NONBLOCK;
+			else
+				/* Save the flags: */
+				_thread_fd_table[fd]->flags = flags & ~O_NONBLOCK;
+			break;
+		default:
+			/* Might want to make va_arg use a union */
+			ret = _thread_sys_fcntl(fd, cmd, va_arg(ap, void *));
+			break;
+		}
+
+		/* Free variable arguments: */
+		va_end(ap);
+
+		/* Unlock the file descriptor: */
+		_FD_UNLOCK(fd, FD_RDWR);
+	}
+
+	/* Return the completion status: */
+	return (ret);
+}
+#endif