Remove unused support for SysV shared memory

src/trusted/service_runtime/include/bits/stat.h

 /*
  * Copyright (c) 2008 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /*
  * NaCl Service Runtime API.
  */
 
 #ifndef NATIVE_CLIENT_SRC_TRUSTED_SERVICE_RUNTIME_INCLUDE_BITS_STAT_H_
 #define NATIVE_CLIENT_SRC_TRUSTED_SERVICE_RUNTIME_INCLUDE_BITS_STAT_H_
 
 /*
  * nacl_abi_mode_t is uint32_t, so we have more bits to play with:
  *
  * 3 b/octal digit, 30 bits:   1234567890
  */
 #define NACL_ABI_S_IFMT        0000370000  /* for now */
-#define NACL_ABI_S_IFSHM_SYSV  0000300000  /* must map all-or-nothing */
+/* Removed NACL_ABI_S_IFSHM_SYSV, which was 0000300000. */
 #define NACL_ABI_S_IFSEMA      0000270000
 #define NACL_ABI_S_IFCOND      0000260000
 #define NACL_ABI_S_IFMUTEX     0000250000
 #define NACL_ABI_S_IFSHM       0000240000
 #define NACL_ABI_S_IFBOUNDSOCK 0000230000  /* bound socket*/
 #define NACL_ABI_S_IFSOCKADDR  0000220000  /* socket address */
 #define NACL_ABI_S_IFDSOCK     0000210000  /* data-only, transferable socket*/
 
 #define NACL_ABI_S_IFSOCK      0000140000  /* data-and-descriptor socket*/
 #define NACL_ABI_S_IFLNK       0000120000  /* symbolic link */
 #define NACL_ABI_S_IFREG       0000100000  /* regular file */
 #define NACL_ABI_S_IFBLK       0000060000  /* block device */
 #define NACL_ABI_S_IFDIR       0000040000  /* directory */
 #define NACL_ABI_S_IFCHR       0000020000  /* character device */
 #define NACL_ABI_S_IFIFO       0000010000  /* fifo */
 
 #define NACL_ABI_S_UNSUP       0000370000  /* unsupported file type */
 /*
  * NaCl does not support file system objects other than regular files
  * and directories, and objects of other types will appear in the
  * directory namespace but will be mapped to NACL_ABI_S_UNSUP when
  * these objects are stat(2)ed.  Opening these kinds of objects will
  * fail.
  *
  * The ABI includes these bits so (library) code that use these
  * preprocessor symbols will compile.  The semantics of having a new
  * "unsupported" file type should enable code to run in a reasonably
  * sane way, but YMMV.
- *
- * NB: sysv shm is only available when host OS is linux, and cannot be
- * created by untrusted code.  The only use is in Pepper2d, and other
- * trusted code is responsible for their creation -- essentially,
- * these objects wrap sysv shm used by the MIT-SHM extension to X11,
- * where the X server creates a SysV shm object to hold pixmap data.
  */
 
 #define NACL_ABI_S_ISUID      0004000
 #define NACL_ABI_S_ISGID      0002000
 #define NACL_ABI_S_ISVTX      0001000
 
 #define NACL_ABI_S_IREAD      0400
 #define NACL_ABI_S_IWRITE     0200
 #define NACL_ABI_S_IEXEC      0100
 
@@ skipping 19 matching lines @@
 #define NACL_ABI_S_ISSOCK(m)  (((m) & NACL_ABI_S_IFMT) == NACL_ABI_S_IFSOCK)
 #define NACL_ABI_S_ISLNK(m)   (((m) & NACL_ABI_S_IFMT) == NACL_ABI_S_IFLNK)
 #define NACL_ABI_S_ISREG(m)   (((m) & NACL_ABI_S_IFMT) == NACL_ABI_S_IFREG)
 #define NACL_ABI_S_ISBLK(m)   (((m) & NACL_ABI_S_IFMT) == NACL_ABI_S_IFBLK)
 #define NACL_ABI_S_ISDIR(m)   (((m) & NACL_ABI_S_IFMT) == NACL_ABI_S_IFDIR)
 #define NACL_ABI_S_ISSOCKADDR(m) \
                               (((m) & NACL_ABI_S_IFMT) == NACL_ABI_S_IFSOCKADDR)
 #define NACL_ABI_S_ISCHR(m)   (((m) & NACL_ABI_S_IFMT) == NACL_ABI_S_IFCHR)
 #define NACL_ABI_S_ISFIFO(m)  (((m) & NACL_ABI_S_IFMT) == NACL_ABI_S_IFIFO)
 #define NACL_ABI_S_ISSHM(m)   (((m) & NACL_ABI_S_IFMT) == NACL_ABI_S_IFSHM)
-#define NACL_ABI_S_ISSHM_SYSV(m) \
-  (((m) & NACL_ABI_S_IFMT) == NACL_ABI_S_IFSHM_SYSV)
 
 #endif