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#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#define _POSIX_TZNAME_MAX 6 139 140#if !defined __USE_XOPEN2K || defined __USE_GNU 141/* Maximum number of connections that can be queued on a socket. */ 142# define _POSIX_QLIMIT 1 143 144/* Maximum number of bytes that can be buffered on a socket for send 145 or receive. */ 146# define _POSIX_HIWAT _POSIX_PIPE_BUF 147 148/* Maximum number of elements in an `iovec' array. */ 149# define _POSIX_UIO_MAXIOV 16 150#endif 151 152/* Maximum clock resolution in nanoseconds. */ 153#define _POSIX_CLOCKRES_MIN 20000000 154 155 156/* Get the implementation-specific values for the above. */ 157#include <bits/local_lim.h> 158 159 160#ifndef SSIZE_MAX 161# define SSIZE_MAX LONG_MAX 162#endif 163 164 165/* This value is a guaranteed minimum maximum. 166 The current maximum can be got from `sysconf'. */ 167 168#ifndef NGROUPS_MAX 169# define NGROUPS_MAX 8 170#endif 171 172#endif /* bits/posix1_lim.h */ 173