1 /* Copyright (C) 1998 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library 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 GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
23 #include <sys/resource.h>
25 #include <sys/types.h>
30 #include "pty-internal.h"
32 /* Given a fd on a master pseudoterminal, chown the file associated
33 with the slave to the calling process, and set its group and
34 mode appropriately. Note that this is an unprivileged operation. */
36 /* This "generic Unix" implementation works because we provide the program
37 /usr/libexec/pt_chown, and it only depends on ptsname() working. */
38 static const char helper
[] = LIBEXECDIR
"/pt_chown";
39 static const char *const argv
[] = { "pt_chown", NULL
};
47 char namebuf
[PTYNAMELEN
];
49 /* Some systems do it for us. */
50 if (__ptsname_r (fd
, namebuf
, PTYNAMELEN
) != 0)
52 if (__xstat (_STAT_VER
, namebuf
, &st
) != 0)
55 if (st
.st_uid
== __getuid ())
58 /* We have to do it in user space. */
65 /* Disable core dumps in the child. */
66 struct rlimit off
= { 0, 0 };
67 setrlimit (RLIMIT_CORE
, &off
);
69 /* The helper does its thing on fd PTY_FD. */
71 if (__dup2 (fd
, PTY_FD
) == -1)
74 __execve (helper
, (char *const *) argv
, 0);
79 if (__waitpid (pid
, &w
, 0) == -1)
83 __set_errno (ENOEXEC
);
87 switch (WEXITSTATUS(w
))
101 __set_errno (ENOEXEC
);
105 assert(! "getpt: internal error: invalid exit code from pt_chown");