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221dc560 | 1 | /* shm_open -- open a POSIX shared memory object. Generic POSIX file version. |
2b778ceb | 2 | Copyright (C) 2001-2021 Free Software Foundation, Inc. |
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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 | |
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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. | |
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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. |
221dc560 | 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/>. */ |
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18 | |
19 | #include <unistd.h> | |
20 | ||
21 | #if ! _POSIX_MAPPED_FILES | |
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22 | |
23 | # include <rt/shm_open.c> | |
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24 | |
25 | #else | |
26 | ||
78e21c5d | 27 | # include <fcntl.h> |
3da5756e | 28 | # include <pthread.h> |
78e21c5d | 29 | # include <shm-directory.h> |
221dc560 | 30 | |
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31 | |
32 | /* Open shared memory object. */ | |
33 | int | |
34 | shm_open (const char *name, int oflag, mode_t mode) | |
35 | { | |
e4f639e4 | 36 | SHM_GET_NAME (EINVAL, -1, ""); |
78e21c5d | 37 | |
cef9b653 | 38 | oflag |= O_NOFOLLOW | O_CLOEXEC; |
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39 | |
40 | /* Disable asynchronous cancellation. */ | |
41 | int state; | |
42 | pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &state); | |
43 | ||
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44 | int fd = open (shm_name, oflag, mode); |
45 | if (fd == -1 && __glibc_unlikely (errno == EISDIR)) | |
46 | /* It might be better to fold this error with EINVAL since | |
47 | directory names are just another example for unsuitable shared | |
48 | object names and the standard does not mention EISDIR. */ | |
49 | __set_errno (EINVAL); | |
50 | ||
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51 | pthread_setcancelstate (state, NULL); |
52 | ||
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53 | return fd; |
54 | } | |
55 | ||
78e21c5d | 56 | #endif /* _POSIX_MAPPED_FILES */ |