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posix1_lim.h
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/* Copyright (C) 1991-2021 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ /* * POSIX Standard: 2.9.2 Minimum Values Added to <limits.h> * * Never include this file directly; use <limits.h> instead. */ #ifndef _BITS_POSIX1_LIM_H #define _BITS_POSIX1_LIM_H 1 #include <bits/wordsize.h> /* These are the standard-mandated minimum values. */ /* Minimum number of operations in one list I/O call. */ #define _POSIX_AIO_LISTIO_MAX 2 /* Minimal number of outstanding asynchronous I/O operations. */ #define _POSIX_AIO_MAX 1 /* Maximum length of arguments to `execve', including environment. */ #define _POSIX_ARG_MAX 4096 /* Maximum simultaneous processes per real user ID. */ #ifdef __USE_XOPEN2K # define _POSIX_CHILD_MAX 25 #else # define _POSIX_CHILD_MAX 6 #endif /* Minimal number of timer expiration overruns. */ #define _POSIX_DELAYTIMER_MAX 32 /* Maximum length of a host name (not including the terminating null) as returned from the GETHOSTNAME function. */ #define _POSIX_HOST_NAME_MAX 255 /* Maximum link count of a file. */ #define _POSIX_LINK_MAX 8 /* Maximum length of login name. */ #define _POSIX_LOGIN_NAME_MAX 9 /* Number of bytes in a terminal canonical input queue. */ #define _POSIX_MAX_CANON 255 /* Number of bytes for which space will be available in a terminal input queue. */ #define _POSIX_MAX_INPUT 255 /* Maximum number of message queues open for a process. */ #define _POSIX_MQ_OPEN_MAX 8 /* Maximum number of supported message priorities. */ #define _POSIX_MQ_PRIO_MAX 32 /* Number of bytes in a filename. */ #define _POSIX_NAME_MAX 14 /* Number of simultaneous supplementary group IDs per process. */ #ifdef __USE_XOPEN2K # define _POSIX_NGROUPS_MAX 8 #else # define _POSIX_NGROUPS_MAX 0 #endif /* Number of files one process can have open at once. */ #ifdef __USE_XOPEN2K # define _POSIX_OPEN_MAX 20 #else # define _POSIX_OPEN_MAX 16 #endif #if !defined __USE_XOPEN2K || defined __USE_GNU /* Number of descriptors that a process may examine with `pselect' or `select'. */ # define _POSIX_FD_SETSIZE _POSIX_OPEN_MAX #endif /* Number of bytes in a pathname. */ #define _POSIX_PATH_MAX 256 /* Number of bytes than can be written atomically to a pipe. */ #define _POSIX_PIPE_BUF 512 /* The number of repeated occurrences of a BRE permitted by the REGEXEC and REGCOMP functions when using the interval notation. */ #define _POSIX_RE_DUP_MAX 255 /* Minimal number of realtime signals reserved for the application. */ #define _POSIX_RTSIG_MAX 8 /* Number of semaphores a process can have. */ #define _POSIX_SEM_NSEMS_MAX 256 /* Maximal value of a semaphore. */ #define _POSIX_SEM_VALUE_MAX 32767 /* Number of pending realtime signals. */ #define _POSIX_SIGQUEUE_MAX 32 /* Largest value of a `ssize_t'. */ #define _POSIX_SSIZE_MAX 32767 /* Number of streams a process can have open at once. */ #define _POSIX_STREAM_MAX 8 /* The number of bytes in a symbolic link. */ #define _POSIX_SYMLINK_MAX 255 /* The number of symbolic links that can be traversed in the resolution of a pathname in the absence of a loop. */ #define _POSIX_SYMLOOP_MAX 8 /* Number of timer for a process. */ #define _POSIX_TIMER_MAX 32 /* Maximum number of characters in a tty name. */ #define _POSIX_TTY_NAME_MAX 9 /* Maximum length of a time zone abbreviation (element of 'tzname'). */ #ifdef __USE_XOPEN2K # define _POSIX_TZNAME_MAX 6 #else # define _POSIX_TZNAME_MAX 3 #endif #if !defined __USE_XOPEN2K || defined __USE_GNU /* Maximum number of connections that can be queued on a socket. */ # define _POSIX_QLIMIT 1 /* Maximum number of bytes that can be buffered on a socket for send or receive. */ # define _POSIX_HIWAT _POSIX_PIPE_BUF /* Maximum number of elements in an `iovec' array. */ # define _POSIX_UIO_MAXIOV 16 #endif /* Maximum clock resolution in nanoseconds. */ #define _POSIX_CLOCKRES_MIN 20000000 /* Get the implementation-specific values for the above. */ #include <bits/local_lim.h> #ifndef SSIZE_MAX /* ssize_t is not formally required to be the signed type corresponding to size_t, but it is for all configurations supported by glibc. */ # if __WORDSIZE == 64 || __WORDSIZE32_SIZE_ULONG # define SSIZE_MAX LONG_MAX # else # define SSIZE_MAX INT_MAX # endif #endif /* This value is a guaranteed minimum maximum. The current maximum can be got from `sysconf'. */ #ifndef NGROUPS_MAX # define NGROUPS_MAX 8 #endif #endif /* bits/posix1_lim.h */