1 /* Copyright (C) 1991-2022 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 <https://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 #include <bits/wordsize.h> 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 #if !defined __USE_XOPEN2K || defined __USE_GNU 91 /* Number of descriptors that a process may examine with `pselect' or 92 `select'. */ 93 # define _POSIX_FD_SETSIZE _POSIX_OPEN_MAX 94 #endif 95 96 /* Number of bytes in a pathname. */ 97 #define _POSIX_PATH_MAX 256 98 99 /* Number of bytes than can be written atomically to a pipe. */ 100 #define _POSIX_PIPE_BUF 512 101 102 /* The number of repeated occurrences of a BRE permitted by the 103 REGEXEC and REGCOMP functions when using the interval notation. */ 104 #define _POSIX_RE_DUP_MAX 255 105 106 /* Minimal number of realtime signals reserved for the application. */ 107 #define _POSIX_RTSIG_MAX 8 108 109 /* Number of semaphores a process can have. */ 110 #define _POSIX_SEM_NSEMS_MAX 256 111 112 /* Maximal value of a semaphore. */ 113 #define _POSIX_SEM_VALUE_MAX 32767 114 115 /* Number of pending realtime signals. */ 116 #define _POSIX_SIGQUEUE_MAX 32 117 118 /* Largest value of a `ssize_t'. */ 119 #define _POSIX_SSIZE_MAX 32767 120 121 /* Number of streams a process can have open at once. */ 122 #define _POSIX_STREAM_MAX 8 123 124 /* The number of bytes in a symbolic link. */ 125 #define _POSIX_SYMLINK_MAX 255 126 127 /* The number of symbolic links that can be traversed in the 128 resolution of a pathname in the absence of a loop. */ 129 #define _POSIX_SYMLOOP_MAX 8 130 131 /* Number of timer for a process. */ 132 #define _POSIX_TIMER_MAX 32 133 134 /* Maximum number of characters in a tty name. */ 135 #define _POSIX_TTY_NAME_MAX 9 136 137 /* Maximum length of a timezone name (element of `tzname'). */ 138 #ifdef __USE_XOPEN2K 139 # define _POSIX_TZNAME_MAX 6 140 #else 141 # define _POSIX_TZNAME_MAX 3 142 #endif 143 144 #if !defined __USE_XOPEN2K || defined __USE_GNU 145 /* Maximum number of connections that can be queued on a socket. */ 146 # define _POSIX_QLIMIT 1 147 148 /* Maximum number of bytes that can be buffered on a socket for send 149 or receive. */ 150 # define _POSIX_HIWAT _POSIX_PIPE_BUF 151 152 /* Maximum number of elements in an `iovec' array. */ 153 # define _POSIX_UIO_MAXIOV 16 154 #endif 155 156 /* Maximum clock resolution in nanoseconds. */ 157 #define _POSIX_CLOCKRES_MIN 20000000 158 159 160 /* Get the implementation-specific values for the above. */ 161 #include <bits/local_lim.h> 162 163 164 #ifndef SSIZE_MAX 165 /* ssize_t is not formally required to be the signed type 166 corresponding to size_t, but it is for all configurations supported 167 by glibc. */ 168 # if __WORDSIZE == 64 || __WORDSIZE32_SIZE_ULONG 169 # define SSIZE_MAX LONG_MAX 170 # else 171 # define SSIZE_MAX INT_MAX 172 # endif 173 #endif 174 175 176 /* This value is a guaranteed minimum maximum. 177 The current maximum can be got from `sysconf'. */ 178 179 #ifndef NGROUPS_MAX 180 # define NGROUPS_MAX 8 181 #endif 182 183 #endif /* bits/posix1_lim.h */ 184