1 files changed, 98 insertions, 0 deletions
diff --git a/lib/libc_r/uthread/uthread_read.c b/lib/libc_r/uthread/uthread_read.c
new file mode 100644
index 00000000000..e84b52cbae4
--- /dev/null
+++ b/lib/libc_r/uthread/uthread_read.c
@@ -0,0 +1,98 @@
+/*
+ * 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.
+ *
+ * $Id: uthread_read.c,v 1.1 1998/08/27 09:01:16 d Exp $
+ * $OpenBSD: uthread_read.c,v 1.1 1998/08/27 09:01:16 d Exp $
+ *
+ */
+#include <sys/types.h>
+#include <sys/fcntl.h>
+#include <sys/uio.h>
+#include <errno.h>
+#include <unistd.h>
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+#include "pthread_private.h"
+
+ssize_t
+read(int fd, void *buf, size_t nbytes)
+{
+	int	ret;
+	int	type;
+
+	/* POSIX says to do just this: */
+	if (nbytes == 0)
+		return (0);
+
+	/* Lock the file descriptor for read: */
+	if ((ret = _FD_LOCK(fd, FD_READ, NULL)) == 0) {
+		/* Get the read/write mode type: */
+		type = _thread_fd_table[fd]->flags & O_ACCMODE;
+
+		/* Check if the file is not open for read: */
+		if (type != O_RDONLY && type != O_RDWR) {
+			/* File is not open for read: */
+			errno = EBADF;
+			_FD_UNLOCK(fd, FD_READ);
+			return (-1);
+		}
+
+		/* Perform a non-blocking read syscall: */
+		while ((ret = _thread_sys_read(fd, buf, nbytes)) < 0) {
+			if ((_thread_fd_table[fd]->flags & O_NONBLOCK) == 0 &&
+			    (errno == EWOULDBLOCK || errno == EAGAIN)) {
+				_thread_run->data.fd.fd = fd;
+				_thread_kern_set_timeout(NULL);
+
+				/* Reset the interrupted operation flag: */
+				_thread_run->interrupted = 0;
+
+				_thread_kern_sched_state(PS_FDR_WAIT,
+				    __FILE__, __LINE__);
+
+				/*
+				 * Check if the operation was
+				 * interrupted by a signal
+				 */
+				if (_thread_run->interrupted) {
+					errno = EINTR;
+					ret = -1;
+					break;
+				}
+			} else {
+				break;
+			}
+		}
+		_FD_UNLOCK(fd, FD_READ);
+	}
+	return (ret);
+}
+#endif