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27fe5f2e | 1 | /* grantpt implementation for Linux. |
2b778ceb | 2 | Copyright (C) 1998-2021 Free Software Foundation, Inc. |
27fe5f2e FW |
3 | This file is part of the GNU C Library. |
4 | Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. | |
139ee080 | 5 | |
27fe5f2e FW |
6 | The GNU C Library is free software; you can redistribute it and/or |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
540d7568 | 10 | |
27fe5f2e FW |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
139ee080 | 15 | |
27fe5f2e FW |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, see | |
18 | <https://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <stdlib.h> | |
22 | #include <sys/ioctl.h> | |
23 | #include <termios.h> | |
139ee080 | 24 | |
27fe5f2e FW |
25 | int |
26 | grantpt (int fd) | |
27 | { | |
28 | /* Without pt_chown on Linux, we have delegated the creation of the | |
29 | pty node with the right group and permission mode to the kernel, and | |
30 | non-root users are unlikely to be able to change it. Therefore let's | |
31 | consider that POSIX enforcement is the responsibility of the whole | |
32 | system and not only the GNU libc. */ | |
139ee080 | 33 | |
27fe5f2e FW |
34 | /* Verify that fd refers to a ptmx descriptor. */ |
35 | unsigned int ptyno; | |
36 | int ret = __ioctl (fd, TIOCGPTN, &ptyno); | |
37 | if (ret != 0 && errno == ENOTTY) | |
38 | /* POSIX requires EINVAL instead of ENOTTY provided by the kernel. */ | |
39 | __set_errno (EINVAL); | |
40 | return ret; | |
139ee080 | 41 | } |