include/sys/unistd.h

   1 /*      $NetBSD: unistd.h,v 1.52 2009/08/30 16:38:48 christos Exp $     */
   2
   3 /*
   4  * Copyright (c) 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)unistd.h    8.2 (Berkeley) 1/7/94
  32  */
  33
  34 #ifndef _SYS_UNISTD_H_
  35 #define _SYS_UNISTD_H_
  36
  37 #include <sys/featuretest.h>
  38
  39 /* compile-time symbolic constants */
  40 #define _POSIX_JOB_CONTROL      1
  41                                 /* implementation supports job control */
  42
  43 /*
  44  * According to POSIX 1003.1:
  45  * "The saved set-user-ID capability allows a program to regain the
  46  * effective user ID established at the last exec call."
  47  * However, the setuid/setgid function as specified by POSIX 1003.1 does
  48  * not allow changing the effective ID from the super-user without also
  49  * changed the saved ID, so it is impossible to get super-user privileges
  50  * back later.  Instead we provide this feature independent of the current
  51  * effective ID through the seteuid/setegid function.  In addition, we do
  52  * not use the saved ID as specified by POSIX 1003.1 in setuid/setgid,
  53  * because this would make it impossible for a set-user-ID executable
  54  * owned by a user other than the super-user to permanently revoke its
  55  * extra privileges.
  56  */
  57 #ifdef  _NOT_AVAILABLE
  58 #define _POSIX_SAVED_IDS        1
  59                                 /* saved set-user-ID and set-group-ID */
  60 #endif
  61
  62 #define _POSIX_VERSION                  200112L
  63 #define _POSIX2_VERSION                 200112L
  64
  65 /* execution-time symbolic constants */
  66
  67 /*
  68  * POSIX options and option groups we unconditionally do or don't
  69  * implement.  Those options which are implemented (or not) entirely
  70  * in user mode are defined in <unistd.h>.  Please keep this list in
  71  * alphabetical order.
  72  *
  73  * Anything which is defined as zero below **must** have an
  74  * implementation for the corresponding sysconf() which is able to
  75  * determine conclusively whether or not the feature is supported.
  76  * Anything which is defined as other than -1 below **must** have
  77  * complete headers, types, and function declarations as specified by
  78  * the POSIX standard; however, if the relevant sysconf() function
  79  * returns -1, the functions may be stubbed out.
  80  */
  81                                         /* Advisory information */
  82 #undef  _POSIX_ADVISORY_INFO
  83                                         /* asynchronous I/O is available */
  84 #define _POSIX_ASYNCHRONOUS_IO          200112L
  85                                         /* barriers */
  86 #define _POSIX_BARRIERS                 200112L
  87                                         /* chown requires correct privileges */
  88 #define _POSIX_CHOWN_RESTRICTED         1
  89                                         /* clock selection */
  90 #define _POSIX_CLOCK_SELECTION          -1
  91                                         /* CPU type */
  92 #undef  _POSIX_CPUTYPE
  93                                         /* file synchronization is available */
  94 #define _POSIX_FSYNC                    1
  95                                         /* support IPv6 */
  96 #define _POSIX_IPV6                     0
  97                                         /* job control is available */
  98 #define _POSIX_JOB_CONTROL              1
  99                                         /* memory mapped files */
 100 #define _POSIX_MAPPED_FILES             1
 101                                         /* memory locking whole address space */
 102 #define _POSIX_MEMLOCK                  1
 103                                         /* memory locking address ranges */
 104 #define _POSIX_MEMLOCK_RANGE            1
 105                                         /* memory access protections */
 106 #define _POSIX_MEMORY_PROTECTION        1
 107                                         /* message passing is available */
 108 #define _POSIX_MESSAGE_PASSING          200112L
 109                                         /* monotonic clock */
 110 #define _POSIX_MONOTONIC_CLOCK          200112L
 111                                         /* too-long path comp generate errors */
 112 #define _POSIX_NO_TRUNC                 1
 113                                         /* prioritized I/O */
 114 #define _POSIX_PRIORITIZED_IO           -1
 115                                         /* priority scheduling */
 116 #define _POSIX_PRIORITY_SCHEDULING      200112L
 117                                         /* raw sockets */
 118 #define _POSIX_RAW_SOCKETS              200112L
 119                                         /* read/write locks */
 120 #define _POSIX_READER_WRITER_LOCKS      200112L
 121                                         /* realtime signals */
 122 #undef  _POSIX_REALTIME_SIGNALS
 123                                         /* regular expressions */
 124 #define _POSIX_REGEXP                   1
 125                                         /* semaphores */
 126 #define _POSIX_SEMAPHORES               0
 127                                         /* shared memory */
 128 #undef  _POSIX_SHARED_MEMORY_OBJECTS
 129                                         /* shell */
 130 #define _POSIX_SHELL                    1
 131                                         /* spin locks */
 132 #define _POSIX_SPIN_LOCKS               200112L
 133                                         /* sporadic server */
 134 #undef  _POSIX_SPORADIC_SERVER
 135                                         /* synchronized I/O is available */
 136 #define _POSIX_SYNCHRONIZED_IO          1
 137                                         /* threads */
 138 #define _POSIX_THREADS                  200112L
 139                                         /* pthread_attr for stack size */
 140 #define _POSIX_THREAD_ATTR_STACKSIZE    200112L
 141                                         /* pthread_attr for stack address */
 142 #define _POSIX_THREAD_ATTR_STACKADDR    200112L
 143                                         /* _r functions */
 144 #define _POSIX_THREAD_SAFE_FUNCTIONS    200112L
 145                                         /* timeouts */
 146 #undef  _POSIX_TIMEOUTS
 147                                         /* timers */
 148 #undef  _POSIX_TIMERS
 149                                         /* typed memory objects */
 150 #undef  _POSIX_TYPED_MEMORY_OBJECTS
 151                                         /* may disable terminal spec chars */
 152 #define _POSIX_VDISABLE                 __CAST(unsigned char, '\377')
 153
 154                                         /* C binding */
 155 #define _POSIX2_C_BIND                  200112L
 156
 157                                         /* XPG4.2 shared memory */
 158 #define _XOPEN_SHM                      0
 159
 160 /* access function */
 161 #define F_OK            0       /* test for existence of file */
 162 #define X_OK            0x01    /* test for execute or search permission */
 163 #define W_OK            0x02    /* test for write permission */
 164 #define R_OK            0x04    /* test for read permission */
 165
 166 /* whence values for lseek(2) */
 167 #define SEEK_SET        0       /* set file offset to offset */
 168 #define SEEK_CUR        1       /* set file offset to current plus offset */
 169 #define SEEK_END        2       /* set file offset to EOF plus offset */
 170
 171 #if defined(_NETBSD_SOURCE)
 172 /* whence values for lseek(2); renamed by POSIX 1003.1 */
 173 #define L_SET           SEEK_SET
 174 #define L_INCR          SEEK_CUR
 175 #define L_XTND          SEEK_END
 176 #endif
 177
 178 /* configurable pathname variables; use as argument to pathconf(3) */
 179 #define _PC_LINK_MAX       1    /* link count */
 180 #define _PC_MAX_CANON      2    /* size of the canonical input queue */
 181 #define _PC_MAX_INPUT      3    /* type-ahead buffer size */
 182 #define _PC_NAME_MAX       4    /* file name size */
 183 #define _PC_PATH_MAX       5    /* pathname size */
 184 #define _PC_PIPE_BUF       6    /* pipe size */
 185 #define _PC_NO_TRUNC       7    /* treatment of long name components */
 186 #define _PC_VDISABLE       8    /* tty disable */
 187 #define _PC_CHOWN_RESTRICTED 9  /* chown restricted or not */
 188
 189 /* configurable system variables; use as argument to sysconf(3) */
 190 /*
 191  * XXX The value of _SC_CLK_TCK is embedded in <time.h>.
 192  * XXX The value of _SC_PAGESIZE is embedded in <sys/shm.h>.
 193  */
 194 #define _SC_ARG_MAX        1
 195 #define _SC_CHILD_MAX      2
 196 #define _SC_CLOCKS_PER_SEC 3
 197 #define _SC_CLK_TCK        3
 198 #define _SC_NGROUPS_MAX    4
 199 #define _SC_OPEN_MAX       5
 200 #define _SC_JOB_CONTROL    6
 201 #define _SC_SAVED_IDS      7
 202 #define _SC_VERSION        8
 203 #define _SC_STREAM_MAX     9
 204 #define _SC_TZNAME_MAX    10
 205 #define _SC_PAGESIZE      11
 206 #define _SC_PAGE_SIZE     _SC_PAGESIZE
 207
 208 #endif /* !_SYS_UNISTD_H_ */