1 /* Create a device file relative to an open directory. Hurd version.
2 Copyright (C) 1991-2023 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)