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