1 files changed, 105 insertions, 0 deletions
diff --git a/lib/libkse/thread/thr_close.c b/lib/libkse/thread/thr_close.c
new file mode 100644
index 0000000..2580fce
--- /dev/null
+++ b/lib/libkse/thread/thr_close.c
@@ -0,0 +1,105 @@
+/*
+ * 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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+#include "pthread_private.h"
+
+int
+close(int fd)
+{
+	int		flags;
+	int		ret;
+	struct stat	sb;
+	struct fd_table_entry	*entry;
+
+	_thread_enter_cancellation_point();
+
+	if ((fd == _thread_kern_pipe[0]) || (fd == _thread_kern_pipe[1])) {
+		/*
+		 * Don't allow silly programs to close the kernel pipe.
+		 */
+		errno = EBADF;
+		ret = -1;
+	}
+	/*
+	 * Lock the file descriptor while the file is closed and get
+	 * the file descriptor status:
+	 */
+	else if (((ret = _FD_LOCK(fd, FD_RDWR, NULL)) == 0) &&
+	    ((ret = _thread_sys_fstat(fd, &sb)) == 0)) {
+		/*
+		 * Check if the file should be left as blocking.
+		 *
+		 * This is so that the file descriptors shared with a parent
+		 * process aren't left set to non-blocking if the child
+		 * closes them prior to exit.  An example where this causes
+		 * problems with /bin/sh is when a child closes stdin.
+		 *
+		 * Setting a file as blocking causes problems if a threaded
+		 * parent accesses the file descriptor before the child exits.
+		 * Once the threaded parent receives a SIGCHLD then it resets
+		 * all of its files to non-blocking, and so it is then safe
+		 * to access them.
+		 *
+		 * Pipes are not set to blocking when they are closed, as
+		 * the parent and child will normally close the file
+		 * descriptor of the end of the pipe that they are not
+		 * using, which would then cause any reads to block
+		 * indefinitely.
+		 */
+		if ((S_ISREG(sb.st_mode) || S_ISCHR(sb.st_mode)) && (_thread_fd_table[fd]->flags & O_NONBLOCK) == 0) {
+			/* Get the current flags: */
+			flags = _thread_sys_fcntl(fd, F_GETFL, NULL);
+			/* Clear the nonblocking file descriptor flag: */
+			_thread_sys_fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
+		}
+
+		/* XXX: Assumes well behaved threads. */
+		/* XXX: Defer real close to avoid race condition */
+		entry = _thread_fd_table[fd];
+		_thread_fd_table[fd] = NULL;
+		free(entry);
+
+		/* Close the file descriptor: */
+		ret = _thread_sys_close(fd);
+	}
+	_thread_leave_cancellation_point();
+	return (ret);
+}
+#endif