1 files changed, 70 insertions, 0 deletions
diff --git a/openpty.c b/openpty.c
new file mode 100644
index 0000000..dab65e1
--- /dev/null
+++ b/openpty.c
@@ -0,0 +1,70 @@
+/*
+ * From musl:     http://www.musl-libc.org/
+----------------------------------------------------------------------
+Copyright © 2005-2020 Rich Felker, et al.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+----------------------------------------------------------------------
+*/
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <termios.h>
+#include <sys/ioctl.h>
+#include <signal.h>
+#include <stdio.h>
+
+/* We implement our own openpty() on Linux so that we don't need to link against libutil */
+
+int openpty(int *pm, int *ps, char name[20], const struct termios *tio, const struct winsize *ws)
+{
+	sig_t old_signal;
+	int ret = -1;
+	int m = posix_openpt(O_RDWR|O_NOCTTY);
+	if (m < 0) return -1;
+
+	old_signal = signal(SIGCHLD, SIG_DFL);
+	if (grantpt(m) >= 0) {
+		if (unlockpt(m) >= 0) {
+			char buf[20];
+			int s;
+
+			if (!name) name = buf;
+			snprintf(name, sizeof(buf), "%s", ptsname(m));
+			if ((s = open(name, O_RDWR|O_NOCTTY)) >= 0) {
+				if (tio) tcsetattr(s, TCSANOW, tio);
+				if (ws) ioctl(s, TIOCSWINSZ, ws);
+
+				*pm = m;
+				*ps = s;
+
+				ret = 0;
+
+				return 0;
+			}
+		}
+	}
+	signal(SIGCHLD, old_signal);
+
+	if (ret) {
+		close(m);
+	}
+	return ret;
+}