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 see <http://www.gnu.org/licenses/>. */
25 #include <sys/resource.h>
27 #include <sys/types.h>
30 #include "pty-private.h"
33 /* Return the result of ptsname_r in the buffer pointed to by PTS,
34 which should be of length BUF_LEN. If it is too long to fit in
35 this buffer, a sufficiently long buffer is allocated using malloc,
36 and returned in PTS. 0 is returned upon success, -1 otherwise. */
38 pts_name (int fd
, char **pts
, size_t buf_len
)
49 rv
= ptsname_r (fd
, buf
, buf_len
);
51 if (rv
!= 0 || memchr (buf
, '\0', buf_len
))
52 /* We either got an error, or we succeeded and the
53 returned name fit in the buffer. */
56 /* Try again with a longer buffer. */
57 buf_len
+= buf_len
; /* Double it */
60 /* No initial buffer; start out by mallocing one. */
61 buf_len
= 128; /* First time guess. */
64 /* We've already malloced another buffer at least once. */
65 new_buf
= realloc (buf
, buf_len
);
67 new_buf
= malloc (buf_len
);
71 /* __set_errno(ENOMEM); */
78 *pts
= buf
; /* Return buffer to the user. */
80 free (buf
); /* Free what we malloced when returning an error. */
85 /* Change the ownership and access permission of the slave pseudo
86 terminal associated with the master pseudo terminal specified
103 if (pts_name (fd
, &buf
, sizeof (_buf
)))
106 if (stat(buf
, &st
) < 0)
109 /* Make sure that we own the device. */
111 if (st
.st_uid
!= uid
)
113 if (chown (buf
, uid
, st
.st_gid
) < 0)
119 /* Make sure the group of the device is that special group. */
120 if (st
.st_gid
!= gid
)
122 if (chown (buf
, uid
, gid
) < 0)
126 /* Make sure the permission mode is set to readable and writable by
127 the owner, and writable by the group. */
128 if ((st
.st_mode
& ACCESSPERMS
) != (S_IRUSR
|S_IWUSR
|S_IWGRP
))
130 if (chmod (buf
, S_IRUSR
|S_IWUSR
|S_IWGRP
) < 0)
137 /* We have to use the helper program. */
145 /* Disable core dumps. */
146 struct rlimit rl
= { 0, 0 };
147 setrlimit (RLIMIT_CORE
, &rl
);
149 /* We pase the master pseudo terminal as file descriptor PTY_FILENO. */
150 if (fd
!= PTY_FILENO
)
151 if (dup2 (fd
, PTY_FILENO
) < 0)
154 execle (_PATH_PT_CHOWN
, _PATH_PT_CHOWN
, NULL
, NULL
);
161 if (waitpid (pid
, &w
, 0) == -1)
166 switch (WEXITSTATUS(w
))
185 assert(! "getpt: internal error: invalid exit code from pt_chown");