1 files changed, 115 insertions, 0 deletions
diff --git a/Src/Modules/clone.c b/Src/Modules/clone.c
new file mode 100644
index 000000000..11387fc90
--- /dev/null
+++ b/Src/Modules/clone.c
@@ -0,0 +1,115 @@
+/*
+ * clone.c - start a forked instance of the current shell on a new terminal
+ *
+ * This file is part of zsh, the Z shell.
+ *
+ * Copyright (c) 1997 Zoltán Hidvégi
+ * All rights reserved.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and to distribute modified versions of this software for any
+ * purpose, provided that the above copyright notice and the following
+ * two paragraphs appear in all copies of this software.
+ *
+ * In no event shall Zoltán Hidvégi or the Zsh Development Group be liable
+ * to any party for direct, indirect, special, incidental, or consequential
+ * damages arising out of the use of this software and its documentation,
+ * even if Zoltán Hidvégi and the Zsh Development Group have been advised of
+ * the possibility of such damage.
+ *
+ * Zoltán Hidvégi and the Zsh Development Group specifically disclaim any
+ * warranties, including, but not limited to, the implied warranties of
+ * merchantability and fitness for a particular purpose.  The software
+ * provided hereunder is on an "as is" basis, and Zoltán Hidvégi and the
+ * Zsh Development Group have no obligation to provide maintenance,
+ * support, updates, enhancements, or modifications.
+ *
+ */
+
+/*
+ * The clone builtin can be used to start a forked instance of the current
+ * shell on a new terminal.  The only argument to the builtin is the name
+ * of the new terminal.  In the new shell the PID, PPID and TTY parameters
+ * are changed appropriately.  $! is set to zero in the new instance of the
+ * shell and to the pid of the new instance in the original shell.
+ *
+ */
+
+#include "clone.mdh"
+#include "clone.pro"
+
+/**/
+static int
+bin_clone(char *nam, char **args, char *ops, int func)
+{
+    int ttyfd, pid;
+
+    unmetafy(*args, NULL);
+    ttyfd = open(*args, O_RDWR|O_NOCTTY);
+    if (ttyfd < 0) {
+	zwarnnam(nam, "%s: %e", *args, errno);
+	return 1;
+    }
+    pid = fork();
+    if (!pid) {
+	clearjobtab();
+	ppid = getppid();
+	mypid = getpid();
+#ifdef HAVE_SETSID
+	if (setsid() != mypid) {
+	    zwarnnam(nam, "failed to create new session: %e", NULL, errno);
+#endif
+#ifdef TIOCNOTTY
+	    if (ioctl(SHTTY, TIOCNOTTY))
+		zwarnnam(nam, "%e", NULL, errno);
+	    setpgrp(0L, mypid);
+#endif
+#ifdef HAVE_SETSID
+	}
+#endif
+	if (ttyfd) {
+	    close(0);
+	    dup(ttyfd);
+	} else
+	    ttyfd = -1;
+	close(1);
+	close(2);
+	dup(0);
+	dup(0);
+	closem(0);
+	close(coprocin);
+	close(coprocout);
+	init_io();
+	setsparam("TTY", ztrdup(ttystrname));
+    }
+    close(ttyfd);
+    if (pid < 0) {
+	zerrnam(nam, "fork failed: %e", NULL, errno);
+	return 1;
+    }
+    lastpid = pid;
+    return 0;
+}
+
+static struct builtin bintab[] = {
+    BUILTIN("clone", 0, bin_clone, 1, 1, 0, NULL, NULL),
+};
+
+/**/
+int
+boot_clone(Module m)
+{
+    return !addbuiltins(m->nam, bintab, sizeof(bintab)/sizeof(*bintab));
+}
+
+#ifdef MODULE
+
+/**/
+int
+cleanup_clone(Module m)
+{
+    deletebuiltins(m->nam, bintab, sizeof(bintab)/sizeof(*bintab));
+    return 0;
+}
+#endif