1 | /* shm_open -- open a POSIX shared memory object. Generic POSIX file version. |
2 | Copyright (C) 2001-2022 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 <fcntl.h> |
21 | #include <not-cancel.h> |
22 | #include <pthread.h> |
23 | #include <shlib-compat.h> |
24 | #include <shm-directory.h> |
25 | #include <unistd.h> |
26 | |
27 | /* Open shared memory object. */ |
28 | int |
29 | __shm_open (const char *name, int oflag, mode_t mode) |
30 | { |
31 | struct shmdir_name dirname; |
32 | if (__shm_get_name (&dirname, name, false) != 0) |
33 | { |
34 | __set_errno (EINVAL); |
35 | return -1; |
36 | } |
37 | |
38 | oflag |= O_NOFOLLOW | O_CLOEXEC; |
39 | |
40 | int fd = __open64_nocancel (dirname.name, oflag, mode); |
41 | if (fd == -1 && __glibc_unlikely (errno == EISDIR)) |
42 | /* It might be better to fold this error with EINVAL since |
43 | directory names are just another example for unsuitable shared |
44 | object names and the standard does not mention EISDIR. */ |
45 | __set_errno (EINVAL); |
46 | |
47 | return fd; |
48 | } |
49 | versioned_symbol (libc, __shm_open, shm_open, GLIBC_2_34); |
50 | |
51 | #if OTHER_SHLIB_COMPAT (librt, GLIBC_2_2, GLIBC_2_34) |
52 | compat_symbol (libc, __shm_open, shm_open, GLIBC_2_2); |
53 | #endif |
54 | |