1 /* Acquire ownership of the slave side of a pseudo-terminal.
2 Copyright (C) 1998-2002, 2009-2012 Free Software Foundation, Inc.
3 Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
30 # include <sys/types.h>
31 # include <sys/time.h>
32 # include <sys/resource.h>
35 #include "configmake.h"
36 #include "pty-private.h"
39 # define __builtin_expect(expr,val) (expr)
40 # define __set_errno(e) errno = (e)
43 # define __setrlimit setrlimit
44 # define __waitpid waitpid
50 #if defined __OpenBSD__
51 /* On OpenBSD, master and slave of a pseudo-terminal are allocated together,
52 through an ioctl on /dev/ptm. There is no need for grantpt(). */
53 if (fcntl (fd, F_GETFD) < 0)
57 /* This function is most often called from a process without 'root'
58 credentials. Use the helper program. */
60 pid_t pid = __fork ();
65 /* This is executed in the child process. */
67 # if HAVE_SETRLIMIT && defined RLIMIT_CORE
68 /* Disable core dumps. */
69 struct rlimit rl = { 0, 0 };
70 __setrlimit (RLIMIT_CORE, &rl);
73 /* We pass the master pseudo terminal as file descriptor PTY_FILENO. */
75 if (__dup2 (fd, PTY_FILENO) < 0)
82 execle (_PATH_PT_CHOWN, strrchr (_PATH_PT_CHOWN, '/') + 1, NULL, NULL);
89 if (__waitpid (pid, &w, 0) == -1)
92 __set_errno (ENOEXEC);
94 switch (WEXITSTATUS (w))
103 __set_errno (EINVAL);
106 __set_errno (EACCES);
109 __set_errno (ENOEXEC);
112 __set_errno (ENOMEM);
116 assert(! "getpt: internal error: invalid exit code from pt_chown");