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