xopen_lim.h
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上传日期:2009-04-28
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- /* Copyright (C) 1996, 1997, 1999, 2001 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, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- /*
- * Never include this file directly; use <limits.h> instead.
- */
- /* Additional definitions from X/Open Portability Guide, Issue 4, Version 2
- System Interfaces and Headers, 4.16 <limits.h>
- Please note only the values which are not greater than the minimum
- stated in the standard document are listed. The `sysconf' functions
- should be used to obtain the actual value. */
- #ifndef _XOPEN_LIM_H
- #define _XOPEN_LIM_H 1
- #define __need_IOV_MAX
- #include <bits/stdio_lim.h>
- /* We do not provide fixed values for
- ARG_MAX Maximum length of argument to the `exec' function
- including environment data.
- ATEXIT_MAX Maximum number of functions that may be registered
- with `atexit'.
- CHILD_MAX Maximum number of simultaneous processes per real
- user ID.
- OPEN_MAX Maximum number of files that one process can have open
- at anyone time.
- PAGESIZE
- PAGE_SIZE Size of bytes of a page.
- PASS_MAX Maximum number of significant bytes in a password.
- We only provide a fixed limit for
- IOV_MAX Maximum number of `iovec' structures that one process has
- available for use with `readv' or writev'.
- if this is indeed fixed by the underlying system.
- */
- /* Maximum number of `iovec' structures that one process has available
- for use with `readv' or writev'. */
- #define _XOPEN_IOV_MAX _POSIX_UIO_MAXIOV
- /* Maximum value of `digit' in calls to the `printf' and `scanf'
- functions. We have no limit, so return a reasonable value. */
- #define NL_ARGMAX _POSIX_ARG_MAX
- /* Maximum number of bytes in a `LANG' name. We have no limit. */
- #define NL_LANGMAX _POSIX2_LINE_MAX
- /* Maximum message number. We have no limit. */
- #define NL_MSGMAX INT_MAX
- /* Maximum number of bytes in N-to-1 collation mapping. We have no
- limit. */
- #define NL_NMAX INT_MAX
- /* Maximum set number. We have no limit. */
- #define NL_SETMAX INT_MAX
- /* Maximum number of bytes in a message. We have no limit. */
- #define NL_TEXTMAX INT_MAX
- /* Default process priority. */
- #define NZERO 20
- /* Number of bits in a word of type `int'. */
- #ifdef INT_MAX
- # if INT_MAX == 32767
- # define WORD_BIT 16
- # else
- # if INT_MAX == 2147483647
- # define WORD_BIT 32
- # else
- /* Safe assumption. */
- # define WORD_BIT 64
- # endif
- # endif
- #elif defined __INT_MAX__
- # if __INT_MAX__ == 32767
- # define WORD_BIT 16
- # else
- # if __INT_MAX__ == 2147483647
- # define WORD_BIT 32
- # else
- /* Safe assumption. */
- # define WORD_BIT 64
- # endif
- # endif
- #else
- # define WORD_BIT 32
- #endif
- /* Number of bits in a word of type `long int'. */
- #ifdef LONG_MAX
- # if LONG_MAX == 2147483647
- # define LONG_BIT 32
- # else
- /* Safe assumption. */
- # define LONG_BIT 64
- # endif
- #elif defined __LONG_MAX__
- # if __LONG_MAX__ == 2147483647
- # define LONG_BIT 32
- # else
- /* Safe assumption. */
- # define LONG_BIT 64
- # endif
- #else
- # include <bits/wordsize.h>
- # if __WORDSIZE == 64
- # define LONG_BIT 64
- # else
- # define LONG_BIT 32
- # endif
- #endif
- #endif /* bits/xopen_lim.h */