From 365815401b77770ac611778315cf4666759673f3 Mon Sep 17 00:00:00 2001
From: Jonas 'Sortie' Termansen <sortie@maxsi.org>
Date: Fri, 18 Nov 2016 18:39:55 +0100
Subject: [PATCH] Add openpty(3).

---
 libc/Makefile      |  1 +
 libc/include/pty.h | 38 ++++++++++++++++++++++++++++++++++++++
 libc/pty/openpty.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 83 insertions(+)
 create mode 100644 libc/include/pty.h
 create mode 100644 libc/pty/openpty.c

diff --git a/libc/Makefile b/libc/Makefile
index 0a39fa7c..9354b55d 100644
--- a/libc/Makefile
+++ b/libc/Makefile
@@ -462,6 +462,7 @@ pwd/getpwuid_r.o \
 pwd/openpw.o \
 pwd/setpwent.o \
 sched/sched_yield.o \
+pty/openpty.o \
 scram/scram.o \
 semaphore/sem_destroy.o \
 semaphore/sem_getvalue.o \
diff --git a/libc/include/pty.h b/libc/include/pty.h
new file mode 100644
index 00000000..5eed9627
--- /dev/null
+++ b/libc/include/pty.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2016 Jonas 'Sortie' Termansen.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * pty.h
+ * Psuedoterminals.
+ */
+
+#ifndef INCLUDE_PTY_H
+#define INCLUDE_PTY_H
+
+#include <sys/cdefs.h>
+
+struct termios;
+struct winsize;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int openpty(int*, int*, char*, const struct termios*, const struct winsize*);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif
diff --git a/libc/pty/openpty.c b/libc/pty/openpty.c
new file mode 100644
index 00000000..7c5f4655
--- /dev/null
+++ b/libc/pty/openpty.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2016 Jonas 'Sortie' Termansen.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * termios/openpty.c
+ * Create and open a pseudoterminal.
+ */
+
+#include <sys/ioctl.h>
+
+#include <pty.h>
+#include <string.h>
+#include <termios.h>
+
+int openpty(int* masterfd,
+            int* slavefd,
+            char* name,
+            const struct termios* tio,
+            const struct winsize* ws)
+{
+	if ( mkpty(masterfd, slavefd, 0) < 0 )
+		return -1;
+	if ( name )
+	{
+		memcpy(name, "/dev/", 5);
+		ioctl(*masterfd, TIOCGNAME, name + 5);
+	}
+	if ( tio )
+		tcsetattr(*slavefd, TCSANOW, tio);
+	if ( ws )
+		ioctl(*masterfd, TIOCSWINSZ, ws);
+	return 0;
+}