1 /* Copyright (C) 1991-2012 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, see
16    <http://www.gnu.org/licenses/>.  */
17 
18 /*
19  *	POSIX Standard: 2.9.2 Minimum Values	Added to <limits.h>
20  *
21  *	Never include this file directly; use <limits.h> instead.
22  */
23 
24 #ifndef	_BITS_POSIX1_LIM_H
25 #define	_BITS_POSIX1_LIM_H	1
26 
27 
28 /* These are the standard-mandated minimum values.  */
29 
30 /* Minimum number of operations in one list I/O call.  */
31 #define _POSIX_AIO_LISTIO_MAX	2
32 
33 /* Minimal number of outstanding asynchronous I/O operations.  */
34 #define _POSIX_AIO_MAX		1
35 
36 /* Maximum length of arguments to `execve', including environment.  */
37 #define	_POSIX_ARG_MAX		4096
38 
39 /* Maximum simultaneous processes per real user ID.  */
40 #ifdef __USE_XOPEN2K
41 # define _POSIX_CHILD_MAX	25
42 #else
43 # define _POSIX_CHILD_MAX	6
44 #endif
45 
46 /* Minimal number of timer expiration overruns.  */
47 #define _POSIX_DELAYTIMER_MAX	32
48 
49 /* Maximum length of a host name (not including the terminating null)
50    as returned from the GETHOSTNAME function.  */
51 #define _POSIX_HOST_NAME_MAX	255
52 
53 /* Maximum link count of a file.  */
54 #define	_POSIX_LINK_MAX		8
55 
56 /* Maximum length of login name.  */
57 #define	_POSIX_LOGIN_NAME_MAX	9
58 
59 /* Number of bytes in a terminal canonical input queue.  */
60 #define	_POSIX_MAX_CANON	255
61 
62 /* Number of bytes for which space will be
63    available in a terminal input queue.  */
64 #define	_POSIX_MAX_INPUT	255
65 
66 /* Maximum number of message queues open for a process.  */
67 #define _POSIX_MQ_OPEN_MAX	8
68 
69 /* Maximum number of supported message priorities.  */
70 #define _POSIX_MQ_PRIO_MAX	32
71 
72 /* Number of bytes in a filename.  */
73 #define	_POSIX_NAME_MAX		14
74 
75 /* Number of simultaneous supplementary group IDs per process.  */
76 #ifdef __USE_XOPEN2K
77 # define _POSIX_NGROUPS_MAX	8
78 #else
79 # define _POSIX_NGROUPS_MAX	0
80 #endif
81 
82 /* Number of files one process can have open at once.  */
83 #ifdef __USE_XOPEN2K
84 # define _POSIX_OPEN_MAX	20
85 #else
86 # define _POSIX_OPEN_MAX	16
87 #endif
88 
89 #if !defined __USE_XOPEN2K || defined __USE_GNU
90 /* Number of descriptors that a process may examine with `pselect' or
91    `select'.  */
92 # define _POSIX_FD_SETSIZE	_POSIX_OPEN_MAX
93 #endif
94 
95 /* Number of bytes in a pathname.  */
96 #define	_POSIX_PATH_MAX		256
97 
98 /* Number of bytes than can be written atomically to a pipe.  */
99 #define	_POSIX_PIPE_BUF		512
100 
101 /* The number of repeated occurrences of a BRE permitted by the
102    REGEXEC and REGCOMP functions when using the interval notation.  */
103 #define _POSIX_RE_DUP_MAX	255
104 
105 /* Minimal number of realtime signals reserved for the application.  */
106 #define _POSIX_RTSIG_MAX	8
107 
108 /* Number of semaphores a process can have.  */
109 #define _POSIX_SEM_NSEMS_MAX	256
110 
111 /* Maximal value of a semaphore.  */
112 #define _POSIX_SEM_VALUE_MAX	32767
113 
114 /* Number of pending realtime signals.  */
115 #define _POSIX_SIGQUEUE_MAX	32
116 
117 /* Largest value of a `ssize_t'.  */
118 #define	_POSIX_SSIZE_MAX	32767
119 
120 /* Number of streams a process can have open at once.  */
121 #define	_POSIX_STREAM_MAX	8
122 
123 /* The number of bytes in a symbolic link.  */
124 #define _POSIX_SYMLINK_MAX	255
125 
126 /* The number of symbolic links that can be traversed in the
127    resolution of a pathname in the absence of a loop.  */
128 #define _POSIX_SYMLOOP_MAX	8
129 
130 /* Number of timer for a process.  */
131 #define _POSIX_TIMER_MAX	32
132 
133 /* Maximum number of characters in a tty name.  */
134 #define	_POSIX_TTY_NAME_MAX	9
135 
136 /* Maximum length of a timezone name (element of `tzname').  */
137 #ifdef __USE_XOPEN2K
138 # define _POSIX_TZNAME_MAX	6
139 #else
140 # define _POSIX_TZNAME_MAX	3
141 #endif
142 
143 #if !defined __USE_XOPEN2K || defined __USE_GNU
144 /* Maximum number of connections that can be queued on a socket.  */
145 # define _POSIX_QLIMIT		1
146 
147 /* Maximum number of bytes that can be buffered on a socket for send
148    or receive.  */
149 # define _POSIX_HIWAT		_POSIX_PIPE_BUF
150 
151 /* Maximum number of elements in an `iovec' array.  */
152 # define _POSIX_UIO_MAXIOV	16
153 #endif
154 
155 /* Maximum clock resolution in nanoseconds.  */
156 #define _POSIX_CLOCKRES_MIN	20000000
157 
158 
159 /* Get the implementation-specific values for the above.  */
160 #include <bits/local_lim.h>
161 
162 
163 #ifndef	SSIZE_MAX
164 # define SSIZE_MAX	LONG_MAX
165 #endif
166 
167 
168 /* This value is a guaranteed minimum maximum.
169    The current maximum can be got from `sysconf'.  */
170 
171 #ifndef	NGROUPS_MAX
172 # define NGROUPS_MAX	8
173 #endif
174 
175 #endif	/* bits/posix1_lim.h  */
176