mirror of
git://git.code.sf.net/p/zsh/code
synced 2024-05-10 01:26:17 +02:00
4163ebf4c7
Shell functions are strictly ASCII for maximum portability. Other files within the distribution may contain UTF-8 characters. Exception for test files: where they need single character input with the top bit set, ISO-8859-X is used (X doesn't matter as we don't need the Euro).
162 lines
3.8 KiB
C
162 lines
3.8 KiB
C
/*
|
|
* 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, UNUSED(Options ops), UNUSED(int func))
|
|
{
|
|
int ttyfd, pid, cttyfd;
|
|
|
|
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(0);
|
|
ppid = getppid();
|
|
mypid = getpid();
|
|
#ifdef HAVE_SETSID
|
|
if (setsid() != mypid)
|
|
zwarnnam(nam, "failed to create new session: %e", errno);
|
|
#elif defined(TIOCNOTTY)
|
|
if (ioctl(SHTTY, TIOCNOTTY, 0))
|
|
zwarnnam(*args, "%e", errno);
|
|
setpgrp(0L, mypid);
|
|
#endif
|
|
dup2(ttyfd,0);
|
|
dup2(ttyfd,1);
|
|
dup2(ttyfd,2);
|
|
if (ttyfd > 2)
|
|
close(ttyfd);
|
|
closem(0);
|
|
close(coprocin);
|
|
close(coprocout);
|
|
/* Acquire a controlling terminal */
|
|
cttyfd = open(*args, O_RDWR);
|
|
if (cttyfd == -1)
|
|
zwarnnam(nam, "%e", errno);
|
|
else {
|
|
#ifdef TIOCSCTTY
|
|
ioctl(cttyfd, TIOCSCTTY, 0);
|
|
#endif
|
|
close(cttyfd);
|
|
}
|
|
/* check if we acquired the tty successfully */
|
|
cttyfd = open("/dev/tty", O_RDWR);
|
|
if (cttyfd == -1)
|
|
zwarnnam(nam, "could not make %s my controlling tty, job control "
|
|
"disabled", *args);
|
|
else
|
|
close(cttyfd);
|
|
|
|
/* Clear mygrp so that acquire_pgrp() gets the new process group.
|
|
* (acquire_pgrp() is called from init_io()) */
|
|
mypgrp = 0;
|
|
init_io();
|
|
setsparam("TTY", ztrdup(ttystrname));
|
|
}
|
|
close(ttyfd);
|
|
if (pid < 0) {
|
|
zerrnam(nam, "fork failed: %e", errno);
|
|
return 1;
|
|
}
|
|
lastpid = pid;
|
|
return 0;
|
|
}
|
|
|
|
static struct builtin bintab[] = {
|
|
BUILTIN("clone", 0, bin_clone, 1, 1, 0, NULL, NULL),
|
|
};
|
|
|
|
static struct features module_features = {
|
|
bintab, sizeof(bintab)/sizeof(*bintab),
|
|
NULL, 0,
|
|
NULL, 0,
|
|
NULL, 0,
|
|
0
|
|
};
|
|
|
|
/**/
|
|
int
|
|
setup_(UNUSED(Module m))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/**/
|
|
int
|
|
features_(Module m, char ***features)
|
|
{
|
|
*features = featuresarray(m, &module_features);
|
|
return 0;
|
|
}
|
|
|
|
/**/
|
|
int
|
|
enables_(Module m, int **enables)
|
|
{
|
|
return handlefeatures(m, &module_features, enables);
|
|
}
|
|
|
|
/**/
|
|
int
|
|
boot_(UNUSED(Module m))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/**/
|
|
int
|
|
cleanup_(Module m)
|
|
{
|
|
return setfeatureenables(m, &module_features, NULL);
|
|
}
|
|
|
|
/**/
|
|
int
|
|
finish_(UNUSED(Module m))
|
|
{
|
|
return 0;
|
|
}
|