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/* Acquire ownership of the slave side of a pseudo-terminal.
Copyright (C) 1998-2002, 2009-2021 Free Software Foundation, Inc.
Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
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>
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
#if HAVE_SETRLIMIT
# include <sys/types.h>
# include <sys/time.h>
# include <sys/resource.h>
#endif
#include "configmake.h"
#include "pty-private.h"
#ifndef _LIBC
# define __set_errno(e) errno = (e)
# define __dup2 dup2
# define __fork fork
# define __setrlimit setrlimit
# define __waitpid waitpid
#endif
int
grantpt (int fd)
{
#if defined __OpenBSD__ || defined _WIN32
/* On OpenBSD, master and slave of a pseudo-terminal are allocated together,
through an ioctl on /dev/ptm. On Windows there are no ptys.
Therefore in either case there is no need for grantpt(). */
return 0;
#else
/* This function is most often called from a process without 'root'
credentials. Use the helper program. */
int retval = -1;
pid_t pid = __fork ();
if (pid == -1)
goto cleanup;
else if (pid == 0)
{
/* This is executed in the child process. */
# if HAVE_SETRLIMIT && defined RLIMIT_CORE
/* Disable core dumps. */
struct rlimit rl = { 0, 0 };
__setrlimit (RLIMIT_CORE, &rl);
# endif
/* We pass the master pseudo terminal as file descriptor PTY_FILENO. */
if (fd != PTY_FILENO)
if (__dup2 (fd, PTY_FILENO) < 0)
_exit (FAIL_EBADF);
# ifdef CLOSE_ALL_FDS
CLOSE_ALL_FDS ();
# endif
execle (_PATH_PT_CHOWN, strrchr (_PATH_PT_CHOWN, '/') + 1, NULL, NULL);
_exit (FAIL_EXEC);
}
else
{
int w;
if (__waitpid (pid, &w, 0) == -1)
goto cleanup;
if (!WIFEXITED (w))
__set_errno (ENOEXEC);
else
switch (WEXITSTATUS (w))
{
case 0:
retval = 0;
break;
case FAIL_EBADF:
__set_errno (EBADF);
break;
case FAIL_EINVAL:
__set_errno (EINVAL);
break;
case FAIL_EACCES:
__set_errno (EACCES);
break;
case FAIL_EXEC:
__set_errno (ENOEXEC);
break;
case FAIL_ENOMEM:
__set_errno (ENOMEM);
break;
default:
assert(! "getpt: internal error: invalid exit code from pt_chown");
}
}
cleanup:
return retval;
#endif
}
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