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/*
* pty_open_slave: open slave side of terminal, clearing for use.
*
* Copyright 1995, 1996 by the Massachusetts Institute of Technology.
*
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that the above copyright notice appear in all
* copies and that both that copyright notice and this permission
* notice appear in supporting documentation, and that the name of
* M.I.T. not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability
* of this software for any purpose. It is provided "as is" without
* express or implied warranty.
*
*/
#include <com_err.h>
#include "libpty.h"
#include "pty-int.h"
long pty_open_slave ( slave, fd)
const char *slave;
int *fd;
{
int vfd, testfd;
long retval;
#ifdef POSIX_SIGNALS
struct sigaction sa;
/* Initialize "sa" structure. */
(void) sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
#endif
/* First, chmod and chown the slave*/
/*
* If we have vhangup then we really need pty_open_ctty to make sure
* Our controlling terminal is the pty we're opening. However, if we
* are using revoke or nothing then we just need a file descriiptor
* for the pty. Considering some OSes in this category break on
* the second call to open_ctty (currently OSF but others may),
* we simply use a descriptor if we can.
*/
#ifdef VHANG_FIRST
if (( retval = pty_open_ctty ( slave, &vfd )) != 0 )
return retval;
if (vfd < 0)
return PTY_OPEN_SLAVE_OPENFAIL;
#endif
if (slave == NULL || *slave == '\0')
return PTY_OPEN_SLAVE_TOOSHORT;
if (chmod(slave, 0))
return PTY_OPEN_SLAVE_CHMODFAIL;
if ( chown(slave, 0, 0 ) == -1 )
return PTY_OPEN_SLAVE_CHOWNFAIL;
#ifdef VHANG_FIRST
ptyint_vhangup();
(void) close(vfd);
#endif
if ( (retval = ptyint_void_association()) != 0)
return retval;
#ifdef HAVE_REVOKE
if (revoke (slave) < 0 ) {
return PTY_OPEN_SLAVE_REVOKEFAIL;
}
#endif /*HAVE_REVOKE*/
/* Open the pty for real. */
if (( retval = pty_open_ctty ( slave, fd)) != 0 ) {
return PTY_OPEN_SLAVE_OPENFAIL;
}
retval = pty_initialize_slave (*fd);
if (retval)
return retval;
testfd = open("/dev/tty", O_RDWR|O_NDELAY);
if ( testfd < 0 )
{
close(*fd);
*fd = -1;
return PTY_OPEN_SLAVE_NOCTTY;
}
close(testfd);
return 0;
}
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