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      1 /* Copyright (C) 1991-1993,96,98,2000-2003,2004 Free Software Foundation, Inc.
      2    This file is part of the GNU C Library.
      3 
      4    The GNU C Library is free software; you can redistribute it and/or
      5    modify it under the terms of the GNU Lesser General Public
      6    License as published by the Free Software Foundation; either
      7    version 2.1 of the License, or (at your option) any later version.
      8 
      9    The GNU C Library is distributed in the hope that it will be useful,
     10    but WITHOUT ANY WARRANTY; without even the implied warranty of
     11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12    Lesser General Public License for more details.
     13 
     14    You should have received a copy of the GNU Lesser General Public
     15    License along with the GNU C Library; if not, write to the Free
     16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     17    02111-1307 USA.  */
     18 
     19 /*
     20  *	POSIX Standard: 2.9.2 Minimum Values	Added to <limits.h>
     21  *
     22  *	Never include this file directly; use <limits.h> instead.
     23  */
     24 
     25 #ifndef	_BITS_POSIX1_LIM_H
     26 #define	_BITS_POSIX1_LIM_H	1
     27 
     28 
     29 /* These are the standard-mandated minimum values.  */
     30 
     31 /* Minimum number of operations in one list I/O call.  */
     32 #define _POSIX_AIO_LISTIO_MAX	2
     33 
     34 /* Minimal number of outstanding asynchronous I/O operations.  */
     35 #define _POSIX_AIO_MAX		1
     36 
     37 /* Maximum length of arguments to `execve', including environment.  */
     38 #define	_POSIX_ARG_MAX		4096
     39 
     40 /* Maximum simultaneous processes per real user ID.  */
     41 #ifdef __USE_XOPEN2K
     42 # define _POSIX_CHILD_MAX	25
     43 #else
     44 # define _POSIX_CHILD_MAX	6
     45 #endif
     46 
     47 /* Minimal number of timer expiration overruns.  */
     48 #define _POSIX_DELAYTIMER_MAX	32
     49 
     50 /* Maximum length of a host name (not including the terminating null)
     51    as returned from the GETHOSTNAME function.  */
     52 #define _POSIX_HOST_NAME_MAX	255
     53 
     54 /* Maximum link count of a file.  */
     55 #define	_POSIX_LINK_MAX		8
     56 
     57 /* Maximum length of login name.  */
     58 #define	_POSIX_LOGIN_NAME_MAX	9
     59 
     60 /* Number of bytes in a terminal canonical input queue.  */
     61 #define	_POSIX_MAX_CANON	255
     62 
     63 /* Number of bytes for which space will be
     64    available in a terminal input queue.  */
     65 #define	_POSIX_MAX_INPUT	255
     66 
     67 /* Maximum number of message queues open for a process.  */
     68 #define _POSIX_MQ_OPEN_MAX	8
     69 
     70 /* Maximum number of supported message priorities.  */
     71 #define _POSIX_MQ_PRIO_MAX	32
     72 
     73 /* Number of bytes in a filename.  */
     74 #define	_POSIX_NAME_MAX		14
     75 
     76 /* Number of simultaneous supplementary group IDs per process.  */
     77 #ifdef __USE_XOPEN2K
     78 # define _POSIX_NGROUPS_MAX	8
     79 #else
     80 # define _POSIX_NGROUPS_MAX	0
     81 #endif
     82 
     83 /* Number of files one process can have open at once.  */
     84 #ifdef __USE_XOPEN2K
     85 # define _POSIX_OPEN_MAX	20
     86 #else
     87 # define _POSIX_OPEN_MAX	16
     88 #endif
     89 
     90 /* Number of descriptors that a process may examine with `pselect' or
     91    `select'.  */
     92 #define	_POSIX_FD_SETSIZE	_POSIX_OPEN_MAX
     93 
     94 /* Number of bytes in a pathname.  */
     95 #define	_POSIX_PATH_MAX		256
     96 
     97 /* Number of bytes than can be written atomically to a pipe.  */
     98 #define	_POSIX_PIPE_BUF		512
     99 
    100 /* The number of repeated occurrences of a BRE permitted by the
    101    REGEXEC and REGCOMP functions when using the interval notation.  */
    102 #define _POSIX_RE_DUP_MAX	255
    103 
    104 /* Minimal number of realtime signals reserved for the application.  */
    105 #define _POSIX_RTSIG_MAX	8
    106 
    107 /* Number of semaphores a process can have.  */
    108 #define _POSIX_SEM_NSEMS_MAX	256
    109 
    110 /* Maximal value of a semaphore.  */
    111 #define _POSIX_SEM_VALUE_MAX	32767
    112 
    113 /* Number of pending realtime signals.  */
    114 #define _POSIX_SIGQUEUE_MAX	32
    115 
    116 /* Largest value of a `ssize_t'.  */
    117 #define	_POSIX_SSIZE_MAX	32767
    118 
    119 /* Number of streams a process can have open at once.  */
    120 #define	_POSIX_STREAM_MAX	8
    121 
    122 /* The number of bytes in a symbolic link.  */
    123 #define _POSIX_SYMLINK_MAX	255
    124 
    125 /* The number of symbolic links that can be traversed in the
    126    resolution of a pathname in the absence of a loop.  */
    127 #define _POSIX_SYMLOOP_MAX	8
    128 
    129 /* Number of timer for a process.  */
    130 #define _POSIX_TIMER_MAX	32
    131 
    132 /* Maximum number of characters in a tty name.  */
    133 #define	_POSIX_TTY_NAME_MAX	9
    134 
    135 /* Maximum length of a timezone name (element of `tzname').  */
    136 #define	_POSIX_TZNAME_MAX	6
    137 
    138 /* Maximum number of connections that can be queued on a socket.  */
    139 #define	_POSIX_QLIMIT		1
    140 
    141 /* Maximum number of bytes that can be buffered on a socket for send
    142    or receive.  */
    143 #define	_POSIX_HIWAT		_POSIX_PIPE_BUF
    144 
    145 /* Maximum number of elements in an `iovec' array.  */
    146 #define	_POSIX_UIO_MAXIOV	16
    147 
    148 /* Maximum clock resolution in nanoseconds.  */
    149 #define _POSIX_CLOCKRES_MIN	20000000
    150 
    151 
    152 /* Get the implementation-specific values for the above.  */
    153 #include <bits/local_lim.h>
    154 
    155 
    156 #ifndef	SSIZE_MAX
    157 # define SSIZE_MAX	LONG_MAX
    158 #endif
    159 
    160 
    161 /* This value is a guaranteed minimum maximum.
    162    The current maximum can be got from `sysconf'.  */
    163 
    164 #ifndef	NGROUPS_MAX
    165 # define NGROUPS_MAX	8
    166 #endif
    167 
    168 #endif	/* bits/posix1_lim.h  */
    169