1 files changed, 70 insertions, 0 deletions
diff --git a/lib/libc/gen/ctermid.c b/lib/libc/gen/ctermid.c
new file mode 100644
index 000000000000..8af1cb2f3d30
--- /dev/null
+++ b/lib/libc/gen/ctermid.c
@@ -0,0 +1,70 @@
+/*-
+ * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/sysctl.h>
+
+#include <errno.h>
+#include <paths.h>
+#include <stdio.h>
+#include <string.h>
+
+#define	LEN_PATH_DEV	(sizeof(_PATH_DEV) - 1)
+
+char *
+ctermid(char *s)
+{
+	static char def[sizeof(_PATH_DEV) + SPECNAMELEN];
+	struct stat sb;
+	size_t dlen;
+	int sverrno;
+
+	if (s == NULL) {
+		s = def;
+		dlen = sizeof(def) - LEN_PATH_DEV;
+	} else
+		dlen = L_ctermid - LEN_PATH_DEV;
+	strcpy(s, _PATH_TTY);
+
+	/* Attempt to perform a lookup of the actual TTY pathname. */
+	sverrno = errno;
+	if (stat(_PATH_TTY, &sb) == 0 && S_ISCHR(sb.st_mode))
+		(void)sysctlbyname("kern.devname", s + LEN_PATH_DEV,
+		    &dlen, &sb.st_rdev, sizeof(sb.st_rdev));
+	errno = sverrno;
+	return (s);
+}
+
+char *
+ctermid_r(char *s)
+{
+
+	return (s != NULL ? ctermid(s) : NULL);
+}