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b7a0bfbd | 1 | /* shm_open -- open a POSIX shared memory object. Generic POSIX file version. |
6d7e8eda | 2 | Copyright (C) 2001-2023 Free Software Foundation, Inc. |
a63be9f7 UD |
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 | |
41bdb6e2 AJ |
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. | |
a63be9f7 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
a63be9f7 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
a63be9f7 UD |
18 | |
19 | #include <errno.h> | |
b7a0bfbd | 20 | #include <fcntl.h> |
c6e7ec2f | 21 | #include <not-cancel.h> |
b7a0bfbd | 22 | #include <pthread.h> |
c6e7ec2f | 23 | #include <shlib-compat.h> |
b7a0bfbd FW |
24 | #include <shm-directory.h> |
25 | #include <unistd.h> | |
a63be9f7 UD |
26 | |
27 | /* Open shared memory object. */ | |
28 | int | |
c6e7ec2f | 29 | __shm_open (const char *name, int oflag, mode_t mode) |
a63be9f7 | 30 | { |
b7a0bfbd FW |
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 | ||
c6e7ec2f | 40 | int fd = __open64_nocancel (dirname.name, oflag, mode); |
b7a0bfbd FW |
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 | ||
b7a0bfbd | 47 | return fd; |
a63be9f7 | 48 | } |
c6e7ec2f FW |
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 |