FreeBSD/Linux Kernel Cross Reference
sys/sys/unistd.h

     /*      $NetBSD: unistd.h,v 1.47 2008/08/27 08:58:16 christos Exp $     */
     
     /*
      * Copyright (c) 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)unistd.h    8.2 (Berkeley) 1/7/94
     */
    
    #ifndef _SYS_UNISTD_H_
    #define _SYS_UNISTD_H_
    
    #include <sys/featuretest.h>
    
    /* compile-time symbolic constants */
    #define _POSIX_JOB_CONTROL      1
                                    /* implementation supports job control */
    
    /*
     * According to POSIX 1003.1:
     * "The saved set-user-ID capability allows a program to regain the
     * effective user ID established at the last exec call."
     * However, the setuid/setgid function as specified by POSIX 1003.1 does
     * not allow changing the effective ID from the super-user without also
     * changed the saved ID, so it is impossible to get super-user privileges
     * back later.  Instead we provide this feature independent of the current
     * effective ID through the seteuid/setegid function.  In addition, we do
     * not use the saved ID as specified by POSIX 1003.1 in setuid/setgid,
     * because this would make it impossible for a set-user-ID executable
     * owned by a user other than the super-user to permanently revoke its
     * extra privileges.
     */
    #ifdef  _NOT_AVAILABLE
    #define _POSIX_SAVED_IDS        1
                                    /* saved set-user-ID and set-group-ID */
    #endif
    
    #define _POSIX_VERSION          199009L
    #define _POSIX2_VERSION         199212L
    
    /* execution-time symbolic constants */
                                    /* asynchronous I/O is available */
    #define _POSIX_ASYNCHRONOUS_IO  200112L
                                    /* chown requires appropriate privileges */
    #define _POSIX_CHOWN_RESTRICTED 1
                                    /* clock selection */
    #define _POSIX_CLOCK_SELECTION  -1
                                    /* too-long path components generate errors */
    #define _POSIX_NO_TRUNC         1
                                    /* may disable terminal special characters */
    #define _POSIX_VDISABLE         ((unsigned char)'\377')
                                    /* file synchronization is available */
    #define _POSIX_FSYNC            1
                                    /* synchronized I/O is available */
    #define _POSIX_SYNCHRONIZED_IO  1
                                    /* memory mapped files */
    #define _POSIX_MAPPED_FILES     1
                                    /* memory locking of whole address space */
    #define _POSIX_MEMLOCK          1
                                    /* memory locking address ranges */
    #define _POSIX_MEMLOCK_RANGE    1
                                    /* memory access protections */
    #define _POSIX_MEMORY_PROTECTION 1
                                    /* message passing is available */
    #define _POSIX_MESSAGE_PASSING  200112L
                                    /* monotonic clock */
    #define _POSIX_MONOTONIC_CLOCK  200112L
                                    /* priority scheduling */
    #define _POSIX_PRIORITY_SCHEDULING      200112L
                                    /* threads */
    #define _POSIX_THREADS          200112L
                                    /* _r functions */
    #define _POSIX_THREAD_SAFE_FUNCTIONS    200112L
                                    /* pthread_attr functions for stack size */
    #define _POSIX_THREAD_ATTR_STACKSIZE    200112L
                                   /* pthread_attr functions for stack address */
   #define _POSIX_THREAD_ATTR_STACKADDR    200112L
                                   /* semaphores */
   #define _POSIX_SEMAPHORES       0
                                   /* barriers */
   #define _POSIX_BARRIERS         200112L
                                   /* timers */
   #define _POSIX_TIMERS           200112L
                                   /* spin locks */
   #define _POSIX_SPIN_LOCKS       200112L
                                   /* read/write locks */
   #define _POSIX_READER_WRITER_LOCKS      200112L
                                   /* XPG4.2 shared memory */
   #define _XOPEN_SHM              0
                                   /* shell */
   #define _POSIX_SHELL            1
                                   /* regular expressions */
   #define _POSIX_REGEXP           1
                                   /* C binding */
   #define _POSIX2_C_BIND          200112L
   
   /* access function */
   #define F_OK            0       /* test for existence of file */
   #define X_OK            0x01    /* test for execute or search permission */
   #define W_OK            0x02    /* test for write permission */
   #define R_OK            0x04    /* test for read permission */
   
   /* whence values for lseek(2) */
   #define SEEK_SET        0       /* set file offset to offset */
   #define SEEK_CUR        1       /* set file offset to current plus offset */
   #define SEEK_END        2       /* set file offset to EOF plus offset */
   
   #if defined(_NETBSD_SOURCE)
   /* whence values for lseek(2); renamed by POSIX 1003.1 */
   #define L_SET           SEEK_SET
   #define L_INCR          SEEK_CUR
   #define L_XTND          SEEK_END
   
   /*
    * fsync_range values.
    *
    * Note the following flag values were chosen to not overlap
    * values for SEEK_XXX flags.  While not currently implemented,
    * it is possible to extend this call to respect SEEK_CUR and
    * SEEK_END offset addressing modes.
    */
   #define FDATASYNC       0x0010  /* sync data and minimal metadata */
   #define FFILESYNC       0x0020  /* sync data and metadata */
   #define FDISKSYNC       0x0040  /* flush disk caches after sync */
   #endif
   
   /* configurable pathname variables; use as argument to pathconf(3) */
   #define _PC_LINK_MAX             1
   #define _PC_MAX_CANON            2
   #define _PC_MAX_INPUT            3
   #define _PC_NAME_MAX             4
   #define _PC_PATH_MAX             5
   #define _PC_PIPE_BUF             6
   #define _PC_CHOWN_RESTRICTED     7
   #define _PC_NO_TRUNC             8
   #define _PC_VDISABLE             9
   #define _PC_SYNC_IO             10
   #define _PC_FILESIZEBITS        11
   #define _PC_SYMLINK_MAX         12
   #define _PC_2_SYMLINKS          13
   
   /* configurable system variables; use as argument to sysconf(3) */
   /*
    * XXX The value of _SC_CLK_TCK is embedded in <time.h>.
    * XXX The value of _SC_PAGESIZE is embedded in <sys/shm.h>.
    */
   #define _SC_ARG_MAX              1
   #define _SC_CHILD_MAX            2
   #define _O_SC_CLK_TCK            3 /* Old version, always 100 */
   #define _SC_NGROUPS_MAX          4
   #define _SC_OPEN_MAX             5
   #define _SC_JOB_CONTROL          6
   #define _SC_SAVED_IDS            7
   #define _SC_VERSION              8
   #define _SC_BC_BASE_MAX          9
   #define _SC_BC_DIM_MAX          10
   #define _SC_BC_SCALE_MAX        11
   #define _SC_BC_STRING_MAX       12
   #define _SC_COLL_WEIGHTS_MAX    13
   #define _SC_EXPR_NEST_MAX       14
   #define _SC_LINE_MAX            15
   #define _SC_RE_DUP_MAX          16
   #define _SC_2_VERSION           17
   #define _SC_2_C_BIND            18
   #define _SC_2_C_DEV             19
   #define _SC_2_CHAR_TERM         20
   #define _SC_2_FORT_DEV          21
   #define _SC_2_FORT_RUN          22
   #define _SC_2_LOCALEDEF         23
   #define _SC_2_SW_DEV            24
   #define _SC_2_UPE               25
   #define _SC_STREAM_MAX          26
   #define _SC_TZNAME_MAX          27
   #define _SC_PAGESIZE            28
   #define _SC_PAGE_SIZE           _SC_PAGESIZE    /* 1170 compatibility */
   #define _SC_FSYNC               29
   #define _SC_XOPEN_SHM           30
   #define _SC_SYNCHRONIZED_IO     31
   #define _SC_IOV_MAX             32
   #define _SC_MAPPED_FILES        33
   #define _SC_MEMLOCK             34
   #define _SC_MEMLOCK_RANGE       35
   #define _SC_MEMORY_PROTECTION   36
   #define _SC_LOGIN_NAME_MAX      37
   #define _SC_MONOTONIC_CLOCK     38
   #define _SC_CLK_TCK             39 /* New, variable version */
   #define _SC_ATEXIT_MAX          40
   #define _SC_THREADS             41
   #define _SC_SEMAPHORES          42
   #define _SC_BARRIERS            43
   #define _SC_TIMERS              44
   #define _SC_SPIN_LOCKS          45
   #define _SC_READER_WRITER_LOCKS 46
   #define _SC_GETGR_R_SIZE_MAX    47
   #define _SC_GETPW_R_SIZE_MAX    48
   #define _SC_CLOCK_SELECTION     49
   #define _SC_ASYNCHRONOUS_IO     50
   #define _SC_AIO_LISTIO_MAX      51
   #define _SC_AIO_MAX             52
   #define _SC_MESSAGE_PASSING     53
   #define _SC_MQ_OPEN_MAX         54
   #define _SC_MQ_PRIO_MAX         55
   #define _SC_PRIORITY_SCHEDULING 56
   #define _SC_THREAD_DESTRUCTOR_ITERATIONS 57
   #define _SC_THREAD_KEYS_MAX             58
   #define _SC_THREAD_STACK_MIN            59
   #define _SC_THREAD_THREADS_MAX          60
   #define _SC_THREAD_ATTR_STACKADDR       61
   #define _SC_THREAD_ATTR_STACKSIZE       62
   #define _SC_THREAD_PRIORITY_SCHEDULING  63
   #define _SC_THREAD_PRIO_INHERIT         64
   #define _SC_THREAD_PRIO_PROTECT         65
   #define _SC_THREAD_PROCESS_SHARED       66
   #define _SC_THREAD_SAFE_FUNCTIONS       67
   #define _SC_TTY_NAME_MAX                68
   #define _SC_HOST_NAME_MAX               69
   #define _SC_PASS_MAX                    70
   #define _SC_REGEXP                      71
   #define _SC_SHELL                       72
   #define _SC_SYMLOOP_MAX                 73
   
   /* Actually, they are not supported or implemented yet */
   #define _SC_V6_ILP32_OFF32              74
   #define _SC_V6_ILP32_OFFBIG             75
   #define _SC_V6_LP64_OFF64               76
   #define _SC_V6_LPBIG_OFFBIG             77
   #define _SC_2_PBS                       80
   #define _SC_2_PBS_ACCOUNTING            81
   #define _SC_2_PBS_CHECKPOINT            82
   #define _SC_2_PBS_LOCATE                83
   #define _SC_2_PBS_MESSAGE               84
   #define _SC_2_PBS_TRACK                 85
   
   #ifdef _NETBSD_SOURCE
   /* Commonly provided sysconf() extensions */
   #define _SC_NPROCESSORS_CONF    1001
   #define _SC_NPROCESSORS_ONLN    1002
   /* Native variables */
   #define _SC_SCHED_RT_TS         2001
   #define _SC_SCHED_PRI_MIN       2002
   #define _SC_SCHED_PRI_MAX       2003
   #endif  /* _NETBSD_SOURCE */
   
   /* configurable system strings */
   #define _CS_PATH                 1
   
   #endif /* !_SYS_UNISTD_H_ */

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