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/* Open a pseudo-terminal.
Copyright (C) 2010-2021 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <pty.h>
#if HAVE_OPENPTY
/* Provide a wrapper with the prototype of glibc-2.8 and newer. */
# undef openpty
int
rpl_openpty (int *amaster, int *aslave, char *name,
struct termios const *termp, struct winsize const *winp)
{
/* Cast away const, for implementations with weaker prototypes. */
return openpty (amaster, aslave, name, (struct termios *) termp,
(struct winsize *) winp);
}
#elif defined _WIN32 && !defined __CYGWIN__ /* mingw */
# include <errno.h>
int
openpty (_GL_UNUSED int *amaster, _GL_UNUSED int *aslave,
_GL_UNUSED char *name,
_GL_UNUSED struct termios const *termp,
_GL_UNUSED struct winsize const *winp)
{
/* Mingw lacks pseudo-terminals altogether. */
errno = ENOSYS;
return -1;
}
#else /* AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 10 */
# include <fcntl.h>
# include <stdlib.h>
# include <string.h>
# include <sys/ioctl.h>
# include <termios.h>
# include <unistd.h>
# if defined __sun || defined __hpux /* Solaris, HP-UX */
# include <stropts.h>
# endif
int
openpty (int *amaster, int *aslave, char *name,
struct termios const *termp, struct winsize const *winp)
{
int master;
char *slave_name;
int slave;
# if HAVE__GETPTY /* IRIX */
slave_name = _getpty (&master, O_RDWR, 0622, 0);
if (slave_name == NULL)
return -1;
# else /* AIX 5.1, HP-UX 11, Solaris 10, mingw */
/* This call uses the 'posix_openpt' module. */
master = posix_openpt (O_RDWR | O_NOCTTY);
if (master < 0)
return -1;
# endif
/* This call does not require a dependency to the 'grantpt' module,
because AIX, HP-UX, IRIX, Solaris all have the grantpt() function. */
if (grantpt (master))
goto fail;
/* This call does not require a dependency to the 'unlockpt' module,
because AIX, HP-UX, IRIX, Solaris all have the unlockpt() function. */
if (unlockpt (master))
goto fail;
# if !HAVE__GETPTY /* !IRIX */
slave_name = ptsname (master);
if (slave_name == NULL)
goto fail;
# endif
slave = open (slave_name, O_RDWR | O_NOCTTY);
if (slave == -1)
goto fail;
# if defined __sun || defined __hpux /* Solaris, HP-UX */
if (ioctl (slave, I_PUSH, "ptem") < 0
|| ioctl (slave, I_PUSH, "ldterm") < 0
# if defined __sun
|| ioctl (slave, I_PUSH, "ttcompat") < 0
# endif
)
{
close (slave);
goto fail;
}
# endif
/* XXX Should we ignore errors here? */
if (termp)
tcsetattr (slave, TCSAFLUSH, termp);
if (winp)
ioctl (slave, TIOCSWINSZ, winp);
*amaster = master;
*aslave = slave;
if (name != NULL)
strcpy (name, slave_name);
return 0;
fail:
close (master);
return -1;
}
#endif
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