| /* shm_open -- open a POSIX shared memory object. Generic POSIX file version. |
| Copyright (C) 2001-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <unistd.h> |
| |
| #if ! _POSIX_MAPPED_FILES |
| |
| # include <rt/shm_open.c> |
| |
| #else |
| |
| # include <fcntl.h> |
| # include <pthread.h> |
| # include <shm-directory.h> |
| |
| |
| /* Open shared memory object. */ |
| int |
| shm_open (const char *name, int oflag, mode_t mode) |
| { |
| SHM_GET_NAME (EINVAL, -1, ""); |
| |
| oflag |= O_NOFOLLOW | O_CLOEXEC; |
| |
| /* Disable asynchronous cancellation. */ |
| int state; |
| pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &state); |
| |
| int fd = open (shm_name, oflag, mode); |
| if (fd == -1 && __glibc_unlikely (errno == EISDIR)) |
| /* It might be better to fold this error with EINVAL since |
| directory names are just another example for unsuitable shared |
| object names and the standard does not mention EISDIR. */ |
| __set_errno (EINVAL); |
| |
| pthread_setcancelstate (state, NULL); |
| |
| return fd; |
| } |
| |
| #endif /* _POSIX_MAPPED_FILES */ |
