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/*
* 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
setup_clone(Module m)
{
return 0;
}
/**/
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;
}
/**/
int
finish_clone(Module m)
{
return 0;
}
#endif
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