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

     /*
      * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. 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
     * $FreeBSD: src/sys/sys/unistd.h,v 1.8.2.3 1999/09/05 08:23:16 peter Exp $
     */
    
    #ifndef _SYS_UNISTD_H_
    #define _SYS_UNISTD_H_
    
    /* compile-time symbolic constants */
    #define _POSIX_JOB_CONTROL      /* implementation supports job control */
    
    /*
     * Although we have saved user/group IDs, we do not use them in setuid
     * as described in POSIX 1003.1, because the feature does not work for
     * root.  We use the saved IDs in seteuid/setegid, which are not currently
     * part of the POSIX 1003.1 specification.
     */
    #ifdef  _NOT_AVAILABLE
    #define _POSIX_SAVED_IDS        /* saved set-user-ID and set-group-ID */
    #endif
    
    #define _POSIX_VERSION          199009L
    #define _POSIX2_VERSION         199212L
    
    /* execution-time symbolic constants */
                                    /* chown requires appropriate privileges */
    #define _POSIX_CHOWN_RESTRICTED 1
                                    /* too-long path components generate errors */
    #define _POSIX_NO_TRUNC         1
                                    /* may disable terminal special characters */
    #define _POSIX_VDISABLE         0xff
    
    /* 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 */
    
    #ifndef _POSIX_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
    #endif
    
    /* configurable pathname variables */
    #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
    
    /* configurable system variables */
    #define _SC_ARG_MAX              1
    #define _SC_CHILD_MAX            2
    #define _SC_CLK_TCK              3
    #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
   
   /* configurable system strings */
   #define _CS_PATH                 1
   
   #ifndef _POSIX_SOURCE
   /*
    * rfork() options.
    *
    * XXX currently, operations without RFPROC set are not supported.
    */
   #define RFNAMEG         (1<<0)  /* UNIMPL new plan9 `name space' */
   #define RFENVG          (1<<1)  /* UNIMPL copy plan9 `env space' */
   #define RFFDG           (1<<2)  /* copy fd table */
   #define RFNOTEG         (1<<3)  /* UNIMPL create new plan9 `note group' */
   #define RFPROC          (1<<4)  /* change child (else changes curproc) */
   #define RFMEM           (1<<5)  /* share `address space' */
   #define RFNOWAIT        (1<<6)  /* parent need not wait() on child */ 
   #define RFCNAMEG        (1<<10) /* UNIMPL zero plan9 `name space' */
   #define RFCENVG         (1<<11) /* UNIMPL zero plan9 `env space' */
   #define RFCFDG          (1<<12) /* zero fd table */
   #define RFPPWAIT        (1<<31) /* parent sleeps until child exits (vfork) */
   #endif /* !_POSIX_SOURCE */
   
   #endif /* !_SYS_UNISTD_H_ */

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