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  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)unistd.h    8.2 (Berkeley) 1/7/94
   34  * $FreeBSD$
   35  */
   36 
   37 #ifndef _SYS_UNISTD_H_
   38 #define _SYS_UNISTD_H_
   39 
   40 #include <sys/_posix.h>
   41 
   42 /* compile-time symbolic constants */
   43 #define _POSIX_JOB_CONTROL      /* implementation supports job control */
   44 
   45 /*
   46  * Although we have saved user/group IDs, we do not use them in setuid
   47  * as described in POSIX 1003.1, because the feature does not work for
   48  * root.  We use the saved IDs in seteuid/setegid, which are not currently
   49  * part of the POSIX 1003.1 specification.
   50  */
   51 #ifdef  _NOT_AVAILABLE
   52 #define _POSIX_SAVED_IDS        /* saved set-user-ID and set-group-ID */
   53 #endif
   54 
   55 #define _POSIX2_VERSION         199212L
   56 
   57 /* execution-time symbolic constants */
   58                                 /* chown requires appropriate privileges */
   59 #define _POSIX_CHOWN_RESTRICTED 1
   60                                 /* too-long path components generate errors */
   61 #define _POSIX_NO_TRUNC         1
   62                                 /* may disable terminal special characters */
   63 #define _POSIX_VDISABLE         0xff
   64 
   65 /* access function */
   66 #define F_OK            0       /* test for existence of file */
   67 #define X_OK            0x01    /* test for execute or search permission */
   68 #define W_OK            0x02    /* test for write permission */
   69 #define R_OK            0x04    /* test for read permission */
   70 
   71 /* whence values for lseek(2) */
   72 #define SEEK_SET        0       /* set file offset to offset */
   73 #define SEEK_CUR        1       /* set file offset to current plus offset */
   74 #define SEEK_END        2       /* set file offset to EOF plus offset */
   75 
   76 #ifndef _POSIX_SOURCE
   77 /* whence values for lseek(2); renamed by POSIX 1003.1 */
   78 #define L_SET           SEEK_SET
   79 #define L_INCR          SEEK_CUR
   80 #define L_XTND          SEEK_END
   81 #endif
   82 
   83 /* configurable pathname variables */
   84 #define _PC_LINK_MAX             1
   85 #define _PC_MAX_CANON            2
   86 #define _PC_MAX_INPUT            3
   87 #define _PC_NAME_MAX             4
   88 #define _PC_PATH_MAX             5
   89 #define _PC_PIPE_BUF             6
   90 #define _PC_CHOWN_RESTRICTED     7
   91 #define _PC_NO_TRUNC             8
   92 #define _PC_VDISABLE             9
   93 
   94 /* configurable system variables */
   95 #define _SC_ARG_MAX              1
   96 #define _SC_CHILD_MAX            2
   97 #define _SC_CLK_TCK              3
   98 #define _SC_NGROUPS_MAX          4
   99 #define _SC_OPEN_MAX             5
  100 #define _SC_JOB_CONTROL          6
  101 #define _SC_SAVED_IDS            7
  102 #define _SC_VERSION              8
  103 #define _SC_BC_BASE_MAX          9
  104 #define _SC_BC_DIM_MAX          10
  105 #define _SC_BC_SCALE_MAX        11
  106 #define _SC_BC_STRING_MAX       12
  107 #define _SC_COLL_WEIGHTS_MAX    13
  108 #define _SC_EXPR_NEST_MAX       14
  109 #define _SC_LINE_MAX            15
  110 #define _SC_RE_DUP_MAX          16
  111 #define _SC_2_VERSION           17
  112 #define _SC_2_C_BIND            18
  113 #define _SC_2_C_DEV             19
  114 #define _SC_2_CHAR_TERM         20
  115 #define _SC_2_FORT_DEV          21
  116 #define _SC_2_FORT_RUN          22
  117 #define _SC_2_LOCALEDEF         23
  118 #define _SC_2_SW_DEV            24
  119 #define _SC_2_UPE               25
  120 #define _SC_STREAM_MAX          26
  121 #define _SC_TZNAME_MAX          27
  122 
  123 /* configurable system strings */
  124 #define _CS_PATH                 1
  125 
  126 #ifdef _P1003_1B_VISIBLE
  127 
  128 #define _POSIX_PRIORITY_SCHEDULING
  129 
  130 #if 0
  131 /* Not until the dust settles after the header commit
  132  */
  133 #define _POSIX_ASYNCHRONOUS_IO
  134 #define _POSIX_MEMLOCK
  135 #define _POSIX_MEMLOCK_RANGE
  136 #endif
  137 
  138 /* POSIX.1B sysconf options */
  139 #define _SC_ASYNCHRONOUS_IO     28
  140 #define _SC_MAPPED_FILES        29
  141 #define _SC_MEMLOCK             30
  142 #define _SC_MEMLOCK_RANGE       31
  143 #define _SC_MEMORY_PROTECTION   32
  144 #define _SC_MESSAGE_PASSING     33
  145 #define _SC_PRIORITIZED_IO      34
  146 #define _SC_PRIORITY_SCHEDULING 35
  147 #define _SC_REALTIME_SIGNALS    36
  148 #define _SC_SEMAPHORES          37
  149 #define _SC_FSYNC               38
  150 #define _SC_SHARED_MEMORY_OBJECTS 39
  151 #define _SC_SYNCHRONIZED_IO     40
  152 #define _SC_TIMERS              41
  153 #define _SC_AIO_LISTIO_MAX      42
  154 #define _SC_AIO_MAX             43
  155 #define _SC_AIO_PRIO_DELTA_MAX  44
  156 #define _SC_DELAYTIMER_MAX      45
  157 #define _SC_MQ_OPEN_MAX         46
  158 #define _SC_PAGESIZE            47
  159 #define _SC_RTSIG_MAX           48
  160 #define _SC_SEM_NSEMS_MAX       49
  161 #define _SC_SEM_VALUE_MAX       50
  162 #define _SC_SIGQUEUE_MAX        51
  163 #define _SC_TIMER_MAX           52
  164 
  165 /* POSIX.1B pathconf and fpathconf options */
  166 #define _PC_ASYNC_IO            53
  167 #define _PC_PRIO_IO             54
  168 #define _PC_SYNC_IO             55
  169 
  170 #endif /* _P1003_1B_VISIBLE */
  171 
  172 #ifndef _POSIX_SOURCE
  173 /*
  174  * rfork() options.
  175  *
  176  * XXX currently, operations without RFPROC set are not supported.
  177  */
  178 #define RFNAMEG         (1<<0)  /* UNIMPL new plan9 `name space' */
  179 #define RFENVG          (1<<1)  /* UNIMPL copy plan9 `env space' */
  180 #define RFFDG           (1<<2)  /* copy fd table */
  181 #define RFNOTEG         (1<<3)  /* UNIMPL create new plan9 `note group' */
  182 #define RFPROC          (1<<4)  /* change child (else changes curproc) */
  183 #define RFMEM           (1<<5)  /* share `address space' */
  184 #define RFNOWAIT        (1<<6)  /* parent need not wait() on child */ 
  185 #define RFCNAMEG        (1<<10) /* UNIMPL zero plan9 `name space' */
  186 #define RFCENVG         (1<<11) /* UNIMPL zero plan9 `env space' */
  187 #define RFCFDG          (1<<12) /* zero fd table */
  188 #define RFTHREAD        (1<<13) /* enable kernel thread support */
  189 #define RFSIGSHARE      (1<<14) /* share signal handlers */
  190 #define RFLINUXTHPN     (1<<16) /* do linux clone exit parent notification */
  191 #define RFPPWAIT        (1<<31) /* parent sleeps until child exits (vfork) */
  192 
  193 #endif /* !_POSIX_SOURCE */
  194 
  195 #endif /* !_SYS_UNISTD_H_ */

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