1 /* shm_open -- open a POSIX shared memory object. Generic POSIX file version.
2 Copyright (C) 2001,2002,2005 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 #if ! _POSIX_MAPPED_FILES
23 #include <rt/shm_open.c>
34 #define SHMDIR (_PATH_DEV "shm/")
36 /* Open shared memory object. */
38 shm_open (const char *name, int oflag, mode_t mode)
44 /* Construct the filename. */
45 while (name[0] == '/')
50 /* The name "/" is not supported. */
55 namelen = strlen (name);
56 fname = (char *) __alloca (sizeof SHMDIR - 1 + namelen + 1);
57 __mempcpy (__mempcpy (fname, SHMDIR, sizeof SHMDIR - 1),
60 fd = open (name, oflag, mode);
63 /* We got a descriptor. Now set the FD_CLOEXEC bit. */
64 int flags = fcntl (fd, F_GETFD, 0);
66 if (__builtin_expect (flags, 0) != -1)
69 flags = fcntl (fd, F_SETFD, flags);
74 /* Something went wrong. We cannot return the descriptor. */
75 int save_errno = errno;
78 __set_errno (save_errno);