1 | /* Create a device file relative to an open directory. Hurd version. |
2 | Copyright (C) 1991-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
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 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <errno.h> |
20 | #include <sys/stat.h> |
21 | #include <hurd.h> |
22 | #include <hurd/fd.h> |
23 | #include <hurd/paths.h> |
24 | #include <fcntl.h> |
25 | #include <_itoa.h> |
26 | #include <string.h> |
27 | #include <sys/types.h> |
28 | #include <sys/sysmacros.h> |
29 | #include <shlib-compat.h> |
30 | |
31 | /* Create a device file named PATH relative to FD, with permission and |
32 | special bits MODE and device number DEV (which can be constructed |
33 | from major and minor device numbers with the `makedev' macro |
34 | above). */ |
35 | int |
36 | __mknodat (int fd, const char *path, mode_t mode, dev_t dev) |
37 | { |
38 | error_t errnode, err; |
39 | file_t dir, node; |
40 | char *name; |
41 | char buf[100], *bp; |
42 | const char *translator; |
43 | size_t len; |
44 | |
45 | if (S_ISCHR (mode)) |
46 | { |
47 | translator = _HURD_CHRDEV; |
48 | len = sizeof (_HURD_CHRDEV); |
49 | } |
50 | else if (S_ISBLK (mode)) |
51 | { |
52 | translator = _HURD_BLKDEV; |
53 | len = sizeof (_HURD_BLKDEV); |
54 | } |
55 | else if (S_ISFIFO (mode)) |
56 | { |
57 | translator = _HURD_FIFO; |
58 | len = sizeof (_HURD_FIFO); |
59 | } |
60 | else if (S_ISREG (mode)) |
61 | { |
62 | translator = NULL; |
63 | len = 0; |
64 | } |
65 | else |
66 | return __hurd_fail (EINVAL); |
67 | |
68 | if (translator != NULL && ! S_ISFIFO (mode)) |
69 | { |
70 | /* We set the translator to "ifmt\0major\0minor\0", where IFMT |
71 | depends on the S_IFMT bits of our MODE argument, and MAJOR and |
72 | MINOR are ASCII decimal (octal or hex would do as well) |
73 | representations of our arguments. Thus the convention is that |
74 | CHRDEV and BLKDEV translators are invoked with two non-switch |
75 | arguments, giving the major and minor device numbers in %i format. */ |
76 | |
77 | bp = buf + sizeof (buf); |
78 | *--bp = '\0'; |
79 | bp = _itoa (__gnu_dev_minor (dev), bp, 10, 0); |
80 | *--bp = '\0'; |
81 | bp = _itoa (__gnu_dev_major (dev), bp, 10, 0); |
82 | memcpy (bp - len, translator, len); |
83 | translator = bp - len; |
84 | len = buf + sizeof (buf) - translator; |
85 | } |
86 | |
87 | dir = __file_name_split_at (fd, path, &name); |
88 | if (dir == MACH_PORT_NULL) |
89 | return -1; |
90 | |
91 | /* Create a new, unlinked node in the target directory. */ |
92 | errnode = err = __dir_mkfile (dir, O_WRITE, (mode & ~S_IFMT) & ~_hurd_umask, &node); |
93 | |
94 | if (! err && translator != NULL) |
95 | /* Set the node's translator to make it a device. */ |
96 | err = __file_set_translator (node, |
97 | FS_TRANS_EXCL | FS_TRANS_SET, |
98 | FS_TRANS_EXCL | FS_TRANS_SET, 0, |
99 | translator, len, |
100 | MACH_PORT_NULL, MACH_MSG_TYPE_COPY_SEND); |
101 | |
102 | if (! err) |
103 | /* Link the node, now a valid device, into the target directory. */ |
104 | err = __dir_link (dir, node, name, 1); |
105 | |
106 | __mach_port_deallocate (__mach_task_self (), dir); |
107 | if (! errnode) |
108 | __mach_port_deallocate (__mach_task_self (), node); |
109 | |
110 | if (err) |
111 | return __hurd_fail (err); |
112 | return 0; |
113 | } |
114 | libc_hidden_def (__mknodat) |
115 | weak_alias (__mknodat, mknodat) |
116 | |