StdLib/Include/sys/unistd.h

   1 /** @file
   2
   3   Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
   4   This program and the accompanying materials are licensed and made available under
   5   the terms and conditions of the BSD License that accompanies this distribution.
   6   The full text of the license may be found at
   7   http://opensource.org/licenses/bsd-license.
   8
   9   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12  * Copyright (c) 1989, 1993
  13  *  The Regents of the University of California.  All rights reserved.
  14  *
  15  * Redistribution and use in source and binary forms, with or without
  16  * modification, are permitted provided that the following conditions
  17  * are met:
  18  * 1. Redistributions of source code must retain the above copyright
  19  *    notice, this list of conditions and the following disclaimer.
  20  * 2. Redistributions in binary form must reproduce the above copyright
  21  *    notice, this list of conditions and the following disclaimer in the
  22  *    documentation and/or other materials provided with the distribution.
  23  * 3. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  *
  39  *  @(#)unistd.h  8.2 (Berkeley) 1/7/94
  40     NetBSD: unistd.h,v 1.35 2006/08/14 18:17:48 rpaulo Exp
  41 **/
  42 #ifndef _SYS_UNISTD_H_
  43 #define _SYS_UNISTD_H_
  44
  45 #include <sys/featuretest.h>
  46
  47 /* compile-time symbolic constants */
  48
  49 /*
  50  * According to POSIX 1003.1:
  51  * "The saved set-user-ID capability allows a program to regain the
  52  * effective user ID established at the last exec call."
  53  * However, the setuid/setgid function as specified by POSIX 1003.1 does
  54  * not allow changing the effective ID from the super-user without also
  55  * changed the saved ID, so it is impossible to get super-user privileges
  56  * back later.  Instead we provide this feature independent of the current
  57  * effective ID through the seteuid/setegid function.  In addition, we do
  58  * not use the saved ID as specified by POSIX 1003.1 in setuid/setgid,
  59  * because this would make it impossible for a set-user-ID executable
  60  * owned by a user other than the super-user to permanently revoke its
  61  * extra privileges.
  62  */
  63 #ifdef  _NOT_AVAILABLE
  64 #define _POSIX_SAVED_IDS  /* saved set-user-ID and set-group-ID */
  65 #endif
  66
  67 #define _POSIX_VERSION    199009L
  68 #define _POSIX2_VERSION   199212L
  69
  70 /* execution-time symbolic constants */
  71         /* timers */
  72 #define _POSIX_TIMERS   200112L
  73
  74 /* Always ensure that these are consistent with <fcntl.h>!
  75    whence values for lseek(2).
  76 */
  77 #ifndef SEEK_SET
  78 #define SEEK_SET  0 /**< set file offset to offset */
  79 #endif
  80 #ifndef SEEK_CUR
  81 #define SEEK_CUR  1 /**< set file offset to current plus offset */
  82 #endif
  83 #ifndef SEEK_END
  84 #define SEEK_END  2 /**< set file offset to EOF plus offset */
  85 #endif
  86
  87 /* whence values for lseek(2); renamed by POSIX 1003.1 */
  88 #define L_SET   SEEK_SET
  89 #define L_INCR    SEEK_CUR
  90 #define L_XTND    SEEK_END
  91
  92 /* configurable system strings */
  93 #define _CS_PATH     1
  94
  95 #endif /* !_SYS_UNISTD_H_ */