1 files changed, 110 insertions, 0 deletions
diff --git a/lib/libc/gen/ttyname.c b/lib/libc/gen/ttyname.c
new file mode 100644
index 0000000..a21b77f
--- /dev/null
+++ b/lib/libc/gen/ttyname.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 1988, 1993
+ *	The Regents of the University of California.  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.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)ttyname.c	8.2 (Berkeley) 1/27/94";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "namespace.h"
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/filio.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <unistd.h>
+#include <string.h>
+#include <paths.h>
+#include <errno.h>
+#include "reentrant.h"
+#include "un-namespace.h"
+
+#include "libc_private.h"
+
+static char ttyname_buf[sizeof(_PATH_DEV) + MAXNAMLEN];
+
+static once_t		ttyname_init_once = ONCE_INITIALIZER;
+static thread_key_t	ttyname_key;
+static int		ttyname_keycreated = 0;
+
+int
+ttyname_r(int fd, char *buf, size_t len)
+{
+	size_t used;
+
+	*buf = '\0';
+
+	/* Must be a terminal. */
+	if (!isatty(fd))
+		return (ENOTTY);
+	/* Must have enough room */
+	if (len <= sizeof(_PATH_DEV))
+		return (ERANGE);
+
+	strcpy(buf, _PATH_DEV);
+	used = strlen(buf);
+	if (fdevname_r(fd, buf + used, len - used) == NULL)
+		return (ENOTTY);
+	return (0);
+}
+
+static void
+ttyname_keycreate(void)
+{
+	ttyname_keycreated = (thr_keycreate(&ttyname_key, free) == 0);
+}
+
+char *
+ttyname(int fd)
+{
+	char	*buf;
+
+	if (thr_main() != 0)
+		buf = ttyname_buf;
+	else {
+		if (thr_once(&ttyname_init_once, ttyname_keycreate) != 0 ||
+		    !ttyname_keycreated)
+			return (NULL);
+		if ((buf = thr_getspecific(ttyname_key)) == NULL) {
+			if ((buf = malloc(sizeof ttyname_buf)) == NULL)
+				return (NULL);
+			if (thr_setspecific(ttyname_key, buf) != 0) {
+				free(buf);
+				return (NULL);
+			}
+		}
+	}
+
+	if (ttyname_r(fd, buf, sizeof ttyname_buf) != 0)
+		return (NULL);
+	return (buf);
+}