From 7a6b317d093b120c8aa38e9abb47d60b61b1fe1d Mon Sep 17 00:00:00 2001
From: Thomas Osterried <thomas@osterried.de>
Date: Sat, 11 Oct 2008 08:27:03 +0000
Subject: 	Support for unix98 ptys ("/dev/ptmx"). Thanks to dk2crn.

---
 ax25ipd/io.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'ax25ipd/io.c')

diff --git a/ax25ipd/io.c b/ax25ipd/io.c
index 8bcb4a5..92217fc 100644
--- a/ax25ipd/io.c
+++ b/ax25ipd/io.c
@@ -143,6 +143,9 @@ void io_init()
 void io_open()
 {
 	int baudrate;
+	int i_am_unix98_pty_master = 0; /* unix98 ptmx support */
+	char *namepts = NULL;           /* name of the unix98 pts slave, which
+					 * the client has to use */
 
 	if (ip_mode) {
 		sock = socket(AF_INET, SOCK_RAW, IPPROTO_AX25);
@@ -189,6 +192,9 @@ void io_open()
 		}
 	}
 
+	if (!strcmp("/dev/ptmx", ttydevice))
+		i_am_unix98_pty_master = 1;
+
 	ttyfd = ((ttyfd_bpq = (strchr(ttydevice, '/') ? 0 : 1)) ? open_ethertap(ttydevice) : open(ttydevice, O_RDWR, 0));
 	if (ttyfd < 0) {
 		perror("opening tty device");
@@ -198,6 +204,20 @@ void io_open()
 		perror("setting non-blocking I/O on tty device");
 		exit(1);
 	}
+	
+	if (i_am_unix98_pty_master) {
+		/* get name of pts-device */
+		if ((namepts = ptsname(ttyfd)) == NULL) {
+			perror("Cannot get name of pts-device.");
+			exit(1);
+		}
+		/* unlock pts-device */
+		if (unlockpt(ttyfd) == -1) {
+			perror("Cannot unlock pts-device.");
+			exit(1);
+		}
+	}
+
 	if (ttyfd_bpq) {
 		set_bpq_dev_call_and_up(ttydevice);
 		goto behind_normal_tty;
@@ -293,6 +313,12 @@ void io_open()
 	if (digi)
 		send_params();
 
+	if (i_am_unix98_pty_master) {
+		/* Users await the slave pty to be referenced in the last line */
+		printf("Awaiting client connects on\n%s\n", namepts);
+		syslog(LOG_INFO, "Bound to master pty /dev/ptmx with slave pty %s\n", namepts);
+	}
+
 behind_normal_tty:
 
 	last_bc_time = 0;	/* force immediate id */
-- 
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