lib/libc/gen/posixshm.c

   1 /*
   2  * Copyright 2000 Massachusetts Institute of Technology
   3  *
   4  * Permission to use, copy, modify, and distribute this software and
   5  * its documentation for any purpose and without fee is hereby
   6  * granted, provided that both the above copyright notice and this
   7  * permission notice appear in all copies, that both the above
   8  * copyright notice and this permission notice appear in all
   9  * supporting documentation, and that the name of M.I.T. not be used
  10  * in advertising or publicity pertaining to distribution of the
  11  * software without specific, written prior permission.  M.I.T. makes
  12  * no representations about the suitability of this software for any
  13  * purpose.  It is provided "as is" without express or implied
  14  * warranty.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
  17  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
  18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
  20  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  26  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/lib/libc/gen/posixshm.c,v 1.2.2.1 2000/08/22 01:48:12 jhb Exp $
  30  * $DragonFly: src/lib/libc/gen/posixshm.c,v 1.3 2005/01/31 22:29:15 dillon Exp $
  31  */
  32
  33 #include "namespace.h"
  34 #include <sys/types.h>
  35 #include <sys/fcntl.h>
  36 #include <sys/mman.h>
  37 #include <sys/stat.h>
  38
  39 #include <errno.h>
  40 #include <unistd.h>
  41 #include "un-namespace.h"
  42
  43 int
  44 shm_open(const char *path, int flags, mode_t mode)
  45 {
  46         int fd;
  47         struct stat stab;
  48
  49         if ((flags & O_ACCMODE) == O_WRONLY)
  50                 return (EINVAL);
  51
  52         fd = _open(path, flags, mode);
  53         if (fd != -1) {
  54                 if (_fstat(fd, &stab) != 0 || !S_ISREG(stab.st_mode)) {
  55                         _close(fd);
  56                         errno = EINVAL;
  57                         return (-1);
  58                 }
  59
  60                 if (_fcntl(fd, F_SETFL, (int)FPOSIXSHM) != 0) {
  61                         _close(fd);
  62                         return (-1);
  63                 }
  64         }
  65         return (fd);
  66 }
  67
  68 int
  69 shm_unlink(const char *path)
  70 {
  71         return (unlink(path));
  72 }