The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)unistd.h    8.2 (Berkeley) 1/7/94
   30  * $FreeBSD: releng/11.1/sys/sys/unistd.h 312170 2017-01-14 11:16:10Z kib $
   31  */
   32 
   33 #ifndef _SYS_UNISTD_H_
   34 #define _SYS_UNISTD_H_
   35 
   36 #include <sys/cdefs.h>
   37 
   38 /*
   39  * POSIX options and option groups we unconditionally do or don't
   40  * implement.  Those options which are implemented (or not) entirely
   41  * in user mode are defined in <unistd.h>.  Please keep this list in
   42  * alphabetical order.
   43  *
   44  * Anything which is defined as zero below **must** have an
   45  * implementation for the corresponding sysconf() which is able to
   46  * determine conclusively whether or not the feature is supported.
   47  * Anything which is defined as other than -1 below **must** have
   48  * complete headers, types, and function declarations as specified by
   49  * the POSIX standard; however, if the relevant sysconf() function
   50  * returns -1, the functions may be stubbed out.
   51  */
   52 #define _POSIX_ADVISORY_INFO            200112L
   53 #define _POSIX_ASYNCHRONOUS_IO          200112L
   54 #define _POSIX_CHOWN_RESTRICTED         1
   55 #define _POSIX_CLOCK_SELECTION          (-1)
   56 #define _POSIX_CPUTIME                  200112L
   57 #define _POSIX_FSYNC                    200112L
   58 #define _POSIX_IPV6                     0
   59 #define _POSIX_JOB_CONTROL              1
   60 #define _POSIX_MAPPED_FILES             200112L
   61 #define _POSIX_MEMLOCK                  (-1)
   62 #define _POSIX_MEMLOCK_RANGE            200112L
   63 #define _POSIX_MEMORY_PROTECTION        200112L
   64 #define _POSIX_MESSAGE_PASSING          200112L
   65 #define _POSIX_MONOTONIC_CLOCK          200112L
   66 #define _POSIX_NO_TRUNC                 1
   67 #define _POSIX_PRIORITIZED_IO           (-1)
   68 #define _POSIX_PRIORITY_SCHEDULING      0
   69 #define _POSIX_RAW_SOCKETS              200112L
   70 #define _POSIX_REALTIME_SIGNALS         200112L
   71 #define _POSIX_SEMAPHORES               200112L
   72 #define _POSIX_SHARED_MEMORY_OBJECTS    200112L
   73 #define _POSIX_SPORADIC_SERVER          (-1)
   74 #define _POSIX_SYNCHRONIZED_IO          (-1)
   75 #define _POSIX_TIMEOUTS                 200112L
   76 #define _POSIX_TIMERS                   200112L
   77 #define _POSIX_TYPED_MEMORY_OBJECTS     (-1)
   78 #define _POSIX_VDISABLE                 0xff
   79 
   80 #if __XSI_VISIBLE
   81 #define _XOPEN_SHM                      1
   82 #define _XOPEN_STREAMS                  (-1)
   83 #endif
   84 
   85 /*
   86  * Although we have saved user/group IDs, we do not use them in setuid
   87  * as described in POSIX 1003.1, because the feature does not work for
   88  * root.  We use the saved IDs in seteuid/setegid, which are not currently
   89  * part of the POSIX 1003.1 specification.  XXX revisit for 1003.1-2001
   90  * as this is now mandatory.
   91  */
   92 #ifdef  _NOT_AVAILABLE
   93 #define _POSIX_SAVED_IDS        1 /* saved set-user-ID and set-group-ID */
   94 #endif
   95 
   96 /* Define the POSIX.1 version we target for compliance. */
   97 #define _POSIX_VERSION          200112L
   98 
   99 /* access function */
  100 #define F_OK            0       /* test for existence of file */
  101 #define X_OK            0x01    /* test for execute or search permission */
  102 #define W_OK            0x02    /* test for write permission */
  103 #define R_OK            0x04    /* test for read permission */
  104 
  105 /* whence values for lseek(2) */
  106 #ifndef SEEK_SET
  107 #define SEEK_SET        0       /* set file offset to offset */
  108 #define SEEK_CUR        1       /* set file offset to current plus offset */
  109 #define SEEK_END        2       /* set file offset to EOF plus offset */
  110 #endif
  111 #if __BSD_VISIBLE
  112 #define SEEK_DATA       3       /* set file offset to next data past offset */
  113 #define SEEK_HOLE       4       /* set file offset to next hole past offset */
  114 #endif
  115 
  116 #ifndef _POSIX_SOURCE
  117 /* whence values for lseek(2); renamed by POSIX 1003.1 */
  118 #define L_SET           SEEK_SET
  119 #define L_INCR          SEEK_CUR
  120 #define L_XTND          SEEK_END
  121 #endif
  122 
  123 /* configurable pathname variables */
  124 #define _PC_LINK_MAX             1
  125 #define _PC_MAX_CANON            2
  126 #define _PC_MAX_INPUT            3
  127 #define _PC_NAME_MAX             4
  128 #define _PC_PATH_MAX             5
  129 #define _PC_PIPE_BUF             6
  130 #define _PC_CHOWN_RESTRICTED     7
  131 #define _PC_NO_TRUNC             8
  132 #define _PC_VDISABLE             9
  133 
  134 #if __POSIX_VISIBLE >= 199309
  135 #define _PC_ASYNC_IO            53
  136 #define _PC_PRIO_IO             54
  137 #define _PC_SYNC_IO             55
  138 #endif
  139 
  140 #if __POSIX_VISIBLE >= 200112
  141 #define _PC_ALLOC_SIZE_MIN      10
  142 #define _PC_FILESIZEBITS        12
  143 #define _PC_REC_INCR_XFER_SIZE  14
  144 #define _PC_REC_MAX_XFER_SIZE   15
  145 #define _PC_REC_MIN_XFER_SIZE   16
  146 #define _PC_REC_XFER_ALIGN      17
  147 #define _PC_SYMLINK_MAX         18
  148 #endif
  149 
  150 #if __BSD_VISIBLE
  151 #define _PC_ACL_EXTENDED        59
  152 #define _PC_ACL_PATH_MAX        60
  153 #define _PC_CAP_PRESENT         61
  154 #define _PC_INF_PRESENT         62
  155 #define _PC_MAC_PRESENT         63
  156 #define _PC_ACL_NFS4            64
  157 #endif
  158 
  159 /* From OpenSolaris, used by SEEK_DATA/SEEK_HOLE. */
  160 #define _PC_MIN_HOLE_SIZE       21
  161 
  162 #if __BSD_VISIBLE
  163 /*
  164  * rfork() options.
  165  *
  166  * XXX currently, some operations without RFPROC set are not supported.
  167  */
  168 #define RFNAMEG         (1<<0)  /* UNIMPL new plan9 `name space' */
  169 #define RFENVG          (1<<1)  /* UNIMPL copy plan9 `env space' */
  170 #define RFFDG           (1<<2)  /* copy fd table */
  171 #define RFNOTEG         (1<<3)  /* UNIMPL create new plan9 `note group' */
  172 #define RFPROC          (1<<4)  /* change child (else changes curproc) */
  173 #define RFMEM           (1<<5)  /* share `address space' */
  174 #define RFNOWAIT        (1<<6)  /* give child to init */
  175 #define RFCNAMEG        (1<<10) /* UNIMPL zero plan9 `name space' */
  176 #define RFCENVG         (1<<11) /* UNIMPL zero plan9 `env space' */
  177 #define RFCFDG          (1<<12) /* close all fds, zero fd table */
  178 #define RFTHREAD        (1<<13) /* enable kernel thread support */
  179 #define RFSIGSHARE      (1<<14) /* share signal handlers */
  180 #define RFLINUXTHPN     (1<<16) /* do linux clone exit parent notification */
  181 #define RFSTOPPED       (1<<17) /* leave child in a stopped state */
  182 #define RFHIGHPID       (1<<18) /* use a pid higher than 10 (idleproc) */
  183 #define RFTSIGZMB       (1<<19) /* select signal for exit parent notification */
  184 #define RFTSIGSHIFT     20      /* selected signal number is in bits 20-27  */
  185 #define RFTSIGMASK      0xFF
  186 #define RFTSIGNUM(flags)        (((flags) >> RFTSIGSHIFT) & RFTSIGMASK)
  187 #define RFTSIGFLAGS(signum)     ((signum) << RFTSIGSHIFT)
  188 #define RFPROCDESC      (1<<28) /* return a process descriptor */
  189 #define RFPPWAIT        (1<<31) /* parent sleeps until child exits (vfork) */
  190 #define RFFLAGS         (RFFDG | RFPROC | RFMEM | RFNOWAIT | RFCFDG | \
  191     RFTHREAD | RFSIGSHARE | RFLINUXTHPN | RFSTOPPED | RFHIGHPID | RFTSIGZMB | \
  192     RFPROCDESC | RFPPWAIT)
  193 #define RFKERNELONLY    (RFSTOPPED | RFHIGHPID | RFPPWAIT | RFPROCDESC)
  194 
  195 #endif /* __BSD_VISIBLE */
  196 
  197 #endif /* !_SYS_UNISTD_H_ */

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