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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * 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
     * $FreeBSD$
     */
    
    #ifndef _SYS_UNISTD_H_
    #define _SYS_UNISTD_H_
    
    #include <sys/cdefs.h>
    
    /*
     * POSIX options and option groups we unconditionally do or don't
     * implement.  Those options which are implemented (or not) entirely
     * in user mode are defined in <unistd.h>.  Please keep this list in
     * alphabetical order.
     *
     * Anything which is defined as zero below **must** have an
     * implementation for the corresponding sysconf() which is able to
     * determine conclusively whether or not the feature is supported.
     * Anything which is defined as other than -1 below **must** have
     * complete headers, types, and function declarations as specified by
     * the POSIX standard; however, if the relevant sysconf() function
     * returns -1, the functions may be stubbed out.
     */
    #define _POSIX_ADVISORY_INFO            200112L
    #define _POSIX_ASYNCHRONOUS_IO          200112L
    #define _POSIX_CHOWN_RESTRICTED         1
    #define _POSIX_CLOCK_SELECTION          (-1)
    #define _POSIX_CPUTIME                  200112L
    #define _POSIX_FSYNC                    200112L
    #define _POSIX_IPV6                     0
    #define _POSIX_JOB_CONTROL              1
    #define _POSIX_MAPPED_FILES             200112L
    #define _POSIX_MEMLOCK                  (-1)
    #define _POSIX_MEMLOCK_RANGE            200112L
    #define _POSIX_MEMORY_PROTECTION        200112L
    #define _POSIX_MESSAGE_PASSING          200112L
    #define _POSIX_MONOTONIC_CLOCK          200112L
    #define _POSIX_NO_TRUNC                 1
    #define _POSIX_PRIORITIZED_IO           (-1)
    #define _POSIX_PRIORITY_SCHEDULING      0
    #define _POSIX_RAW_SOCKETS              200112L
    #define _POSIX_REALTIME_SIGNALS         200112L
    #define _POSIX_SEMAPHORES               200112L
    #define _POSIX_SHARED_MEMORY_OBJECTS    200112L
    #define _POSIX_SPORADIC_SERVER          (-1)
    #define _POSIX_SYNCHRONIZED_IO          (-1)
    #define _POSIX_TIMEOUTS                 200112L
    #define _POSIX_TIMERS                   200112L
    #define _POSIX_TYPED_MEMORY_OBJECTS     (-1)
    #define _POSIX_VDISABLE                 0xff
    
    #if __XSI_VISIBLE
    #define _XOPEN_SHM                      1
    #define _XOPEN_STREAMS                  (-1)
    #endif
    
    /*
     * 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.  XXX revisit for 1003.1-2001
     * as this is now mandatory.
     */
    #ifdef  _NOT_AVAILABLE
    #define _POSIX_SAVED_IDS        1 /* saved set-user-ID and set-group-ID */
    #endif
    
    /* Define the POSIX.1 version we target for compliance. */
    #define _POSIX_VERSION          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) */
   #ifndef SEEK_SET
   #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 */
   #endif
   #if __BSD_VISIBLE
   #define SEEK_DATA       3       /* set file offset to next data past offset */
   #define SEEK_HOLE       4       /* set file offset to next hole past offset */
   #endif
   
   #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
   
   #if __POSIX_VISIBLE >= 199309
   #define _PC_ASYNC_IO            53
   #define _PC_PRIO_IO             54
   #define _PC_SYNC_IO             55
   #endif
   
   #if __POSIX_VISIBLE >= 200112
   #define _PC_ALLOC_SIZE_MIN      10
   #define _PC_FILESIZEBITS        12
   #define _PC_REC_INCR_XFER_SIZE  14
   #define _PC_REC_MAX_XFER_SIZE   15
   #define _PC_REC_MIN_XFER_SIZE   16
   #define _PC_REC_XFER_ALIGN      17
   #define _PC_SYMLINK_MAX         18
   #endif
   
   #if __BSD_VISIBLE
   #define _PC_ACL_EXTENDED        59
   #define _PC_ACL_PATH_MAX        60
   #define _PC_CAP_PRESENT         61
   #define _PC_INF_PRESENT         62
   #define _PC_MAC_PRESENT         63
   #define _PC_ACL_NFS4            64
   #endif
   
   /* From OpenSolaris, used by SEEK_DATA/SEEK_HOLE. */
   #define _PC_MIN_HOLE_SIZE       21
   
   #if __BSD_VISIBLE
   /*
    * rfork() options.
    *
    * XXX currently, some 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)  /* give child to init */
   #define RFCNAMEG        (1<<10) /* UNIMPL zero plan9 `name space' */
   #define RFCENVG         (1<<11) /* UNIMPL zero plan9 `env space' */
   #define RFCFDG          (1<<12) /* close all fds, zero fd table */
   #define RFTHREAD        (1<<13) /* enable kernel thread support */
   #define RFSIGSHARE      (1<<14) /* share signal handlers */
   #define RFLINUXTHPN     (1<<16) /* do linux clone exit parent notification */
   #define RFSTOPPED       (1<<17) /* leave child in a stopped state */
   #define RFHIGHPID       (1<<18) /* use a pid higher than 10 (idleproc) */
   #define RFTSIGZMB       (1<<19) /* select signal for exit parent notification */
   #define RFTSIGSHIFT     20      /* selected signal number is in bits 20-27  */
   #define RFTSIGMASK      0xFF
   #define RFTSIGNUM(flags)        (((flags) >> RFTSIGSHIFT) & RFTSIGMASK)
   #define RFTSIGFLAGS(signum)     ((signum) << RFTSIGSHIFT)
   #define RFPROCDESC      (1<<28) /* return a process descriptor */
   /* kernel: parent sleeps until child exits (vfork) */
   #define RFPPWAIT        (1<<31)
   /* user: vfork(2) semantics, clear signals */
   #define RFSPAWN         (1U<<31)
   #define RFFLAGS         (RFFDG | RFPROC | RFMEM | RFNOWAIT | RFCFDG | \
       RFTHREAD | RFSIGSHARE | RFLINUXTHPN | RFSTOPPED | RFHIGHPID | RFTSIGZMB | \
       RFPROCDESC | RFSPAWN | RFPPWAIT)
   #define RFKERNELONLY    (RFSTOPPED | RFHIGHPID | RFPROCDESC)
   
   #endif /* __BSD_VISIBLE */
   
   #endif /* !_SYS_UNISTD_H_ */

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