1/* Determine directory for shm/sem files. Generic POSIX version.
2 Copyright (C) 2014-2021 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 <unistd.h>
20
21#if _POSIX_MAPPED_FILES
22
23#include <alloc_buffer.h>
24#include <shm-directory.h>
25#include <string.h>
26
27int
28__shm_get_name (struct shmdir_name *result, const char *name, bool sem_prefix)
29{
30 while (name[0] == '/')
31 ++name;
32 size_t namelen = strlen (name);
33
34 struct alloc_buffer buffer
35 = alloc_buffer_create (result->name, sizeof (result->name));
36 alloc_buffer_copy_bytes (&buffer, SHMDIR, strlen (SHMDIR));
37 if (sem_prefix)
38 alloc_buffer_copy_bytes (&buffer, "sem.", strlen ("sem."));
39 alloc_buffer_copy_bytes (&buffer, name, namelen + 1);
40 if (namelen == 0 || memchr (name, '/', namelen) != NULL
41 || alloc_buffer_has_failed (&buffer))
42 return -1;
43 return 0;
44}
45libc_hidden_def (__shm_get_name)
46
47#endif
48