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