From e5888a1ffdae813d7575f5fb02275c6bb07e5199 Mon Sep 17 00:00:00 2001
From: Taru Karttunen <taruti@taruti.net>
Date: Wed, 30 Mar 2011 15:46:40 +0300
Subject: Import sources from 2011-03-30 iso image

---
 sys/src/ape/lib/bsd/pty.c | 111 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100755 sys/src/ape/lib/bsd/pty.c

(limited to 'sys/src/ape/lib/bsd/pty.c')

diff --git a/sys/src/ape/lib/bsd/pty.c b/sys/src/ape/lib/bsd/pty.c
new file mode 100755
index 000000000..3189d24e1
--- /dev/null
+++ b/sys/src/ape/lib/bsd/pty.c
@@ -0,0 +1,111 @@
+/* posix */
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#include <sys/pty.h>
+#include "lib.h"
+#include "sys9.h"
+#include "dir.h"
+
+/*
+ * return the name of the slave
+ */
+char*
+ptsname(int fd)
+{
+	Dir *d;
+	static char buf[32];
+
+	if((d = _dirfstat(fd)) == nil || strlen(d->name) < 4){
+		free(d);
+		_syserrno();
+		return 0;
+	}
+	snprintf(buf, sizeof buf, "/dev/ptty%d", atoi(d->name+4));
+	free(d);
+	return buf;
+}
+
+/*
+ * return the name of the master
+ */
+char*
+ptmname(int fd)
+{
+	Dir *d;
+	static char buf[32];
+
+	if((d = _dirfstat(fd)) == nil || strlen(d->name) < 4){
+		free(d);
+		_syserrno();
+		return 0;
+	}
+
+	snprintf(buf, sizeof buf, "/dev/ttym%d", atoi(d->name+4));
+	return buf;
+}
+
+static char ptycl[] = "/dev/ptyclone";
+static char fssrv[] = "/srv/ptyfs";
+
+static void
+mkserver(void)
+{
+	int fd, i;
+	char *argv[3];
+
+	fd = _OPEN(fssrv, O_RDWR);
+	if(_MOUNT(fd, -1, "/dev", MAFTER, "") < 0) {
+		/*
+		 * remove fssrv here, if it exists, to avoid a race
+		 * between the loop in the default case below and the
+		 * new ptyfs removing fssrv when it starts.
+		 * we otherwise might be unlucky enough to open the old
+		 * (hung channel) fssrv before ptyfs removes it and break
+		 * out of the loop with an open fd to a hung channel?
+		 */
+		_CLOSE(fd);
+		_REMOVE(fssrv);
+		switch(_RFORK(RFPROC|RFFDG)) {
+		case -1:
+			return;
+		case 0:
+			argv[0] = "ptyfs";
+			argv[1] = 0;
+			_EXEC("/bin/ape/ptyfs", argv);
+			_EXITS(0);
+		default:
+			for(i = 0; i < 3; i++) {
+				fd = _OPEN(fssrv, O_RDWR);
+				if(fd >= 0)
+					break;
+				_SLEEP(1000);
+			}
+		}
+		if(fd < 0)
+			return;
+		if(_MOUNT(fd, -1, "/dev", MAFTER, "") < 0)
+			_CLOSE(fd);
+	}
+	/* successful _MOUNT closes fd */
+}
+
+/*
+ * allocate a new pty
+ */
+int
+_getpty(void)
+{
+	struct stat sb;
+
+	if(stat(ptycl, &sb) < 0)
+		mkserver();
+
+	return open(ptycl, O_RDWR);
+}
-- 
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