mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-21 20:40:05 +00:00
60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/* shm_open -- open a POSIX shared memory object. Generic POSIX file version.
|
|
Copyright (C) 2001-2024 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <not-cancel.h>
|
|
#include <pthread.h>
|
|
#include <shlib-compat.h>
|
|
#include <shm-directory.h>
|
|
#include <unistd.h>
|
|
#include <sys/mman.h>
|
|
|
|
/* Open shared memory object. */
|
|
int
|
|
__shm_open (const char *name, int oflag, mode_t mode)
|
|
{
|
|
struct shmdir_name dirname;
|
|
int ret =__shm_get_name (&dirname, name, false);
|
|
if (ret != 0)
|
|
{
|
|
__set_errno (ret);
|
|
return -1;
|
|
}
|
|
|
|
oflag |= O_NOFOLLOW | O_CLOEXEC;
|
|
#if defined (SHM_ANON) && defined (O_TMPFILE)
|
|
if (name == SHM_ANON)
|
|
oflag |= O_TMPFILE;
|
|
#endif
|
|
|
|
int fd = __open64_nocancel (dirname.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);
|
|
|
|
return fd;
|
|
}
|
|
versioned_symbol (libc, __shm_open, shm_open, GLIBC_2_34);
|
|
|
|
#if OTHER_SHLIB_COMPAT (librt, GLIBC_2_2, GLIBC_2_34)
|
|
compat_symbol (libc, __shm_open, shm_open, GLIBC_2_2);
|
|
#endif
|