ACE/ace/os_include/os_limits.h

   1 // -*- C++ -*-
   2
   3 //=============================================================================
   4 /**
   5  *  @file    os_limits.h
   6  *
   7  *  implementation-defined constants
   8  *
   9  *  @author Don Hinton <dhinton@dresystems.com>
  10  *  @author This code was originally in various places including ace/OS.h.
  11  */
  12 //=============================================================================
  13
  14 #ifndef ACE_OS_INCLUDE_OS_LIMITS_H
  15 #define ACE_OS_INCLUDE_OS_LIMITS_H
  16
  17 #include /**/ "ace/pre.h"
  18
  19 #include /**/ "ace/config-lite.h"
  20
  21 #if !defined (ACE_LACKS_PRAGMA_ONCE)
  22 # pragma once
  23 #endif /* ACE_LACKS_PRAGMA_ONCE */
  24
  25 #include "ace/os_include/os_unistd.h"
  26 #include "ace/os_include/os_stdio.h" // for FILENAME_MAX on Windows
  27
  28 #if !defined (ACE_LACKS_LIMITS_H)
  29 # include /**/ <limits.h>
  30 #endif /* !ACE_LACKS_LIMITS_H */
  31
  32 #if !defined (ACE_LACKS_SYS_PARAM_H)
  33 #  include /**/ <sys/param.h>
  34 #endif /* ACE_LACKS_SYS_PARAM_H */
  35
  36 // Place all additions (especially function declarations) within extern "C" {}
  37 #ifdef __cplusplus
  38 extern "C"
  39 {
  40 #endif /* __cplusplus */
  41
  42 #if ! defined (howmany)
  43 #  define howmany(x, y)   (((x)+((y)-1))/(y))
  44 #endif /* howmany */
  45
  46 #if !defined (NAME_MAX)
  47 #  if defined (MAXNAMLEN)
  48 #    define NAME_MAX MAXNAMLEN
  49 #  elif defined (MAXNAMELEN)
  50 #    define NAME_MAX MAXNAMELEN
  51 #  elif defined (FILENAME_MAX)
  52 #    define NAME_MAX FILENAME_MAX
  53 #  elif defined (_MAX_FNAME)
  54 #    define NAME_MAX _MAX_FNAME
  55 #  else /* _MAX_FNAME */
  56 #    define NAME_MAX 256
  57 #  endif /* MAXNAMLEN */
  58 #endif /* !NAME_MAX */
  59
  60 #if !defined (MAXNAMELEN)
  61 #  define MAXNAMELEN NAME_MAX
  62 #endif /* MAXNAMELEN */
  63
  64 #if !defined (HOST_NAME_MAX)
  65 #  define HOST_NAME_MAX 256
  66 #endif /* !HOST_NAME_MAX */
  67
  68 // Note that we are using PATH_MAX instead of _POSIX_PATH_MAX, since
  69 // _POSIX_PATH_MAX is the *minimum* maximum value for PATH_MAX and is
  70 // defined by POSIX as 256.
  71 #if !defined (PATH_MAX)
  72 #  if defined (_MAX_PATH)
  73 #    define PATH_MAX _MAX_PATH
  74 #  elif defined (MAX_PATH)
  75 #    define PATH_MAX MAX_PATH
  76 #  else /* !_MAX_PATH */
  77 #    define PATH_MAX 1024
  78 #  endif /* _MAX_PATH */
  79 #endif /* !PATH_MAX */
  80
  81 // Leaving this for backward compatibility, but PATH_MAX should always be
  82 // used directly.
  83 #if !defined (MAXPATHLEN)
  84 #  define MAXPATHLEN  PATH_MAX
  85 #endif /* !MAXPATHLEN */
  86
  87 // This is defined by XOPEN to be a minimum of 16.  POSIX.1g
  88 // also defines this value.  platform-specific config.h can
  89 // override this if need be.
  90 #if !defined (IOV_MAX)
  91 #  define IOV_MAX 16
  92 #endif /* IOV_MAX */
  93
  94 #if !defined (ACE_IOV_MAX)
  95 #  define ACE_IOV_MAX IOV_MAX
  96 #endif /* ACE_IOV_MAX */
  97
  98 #if defined (ACE_VXWORKS) && (ACE_VXWORKS <= 0x670) && !defined (__RTP__)
  99 #  if defined (PIPE_BUF) && (PIPE_BUF == -1)
 100 #    undef PIPE_BUF
 101 #  endif
 102 #endif /* ACE_VXWORKS */
 103
 104 #if !defined (PIPE_BUF)
 105 #  define PIPE_BUF 5120
 106 #endif /* PIPE_BUF */
 107
 108 #if defined (ACE_HAS_POSIX_REALTIME_SIGNALS)
 109   // = Giving unique ACE scoped names for some important
 110   // RTSignal-Related constants. Because sometimes, different
 111   // platforms use different names for these constants.
 112
 113   // Number of realtime signals provided in the system.
 114   // _POSIX_RTSIG_MAX is the upper limit on the number of real time
 115   // signals supported in a posix-4 compliant system.
 116 #  if defined (_POSIX_RTSIG_MAX)
 117 #    define ACE_RTSIG_MAX _POSIX_RTSIG_MAX
 118 #  else /* not _POSIX_RTSIG_MAX */
 119   // POSIX-4 compliant system has to provide at least 8 RT signals.
 120   // @@ Make sure the platform does *not* define this constant with
 121   // some other name. If yes, use that instead of 8.
 122 #     define ACE_RTSIG_MAX 8
 123 #  endif /* _POSIX_RTSIG_MAX */
 124 #endif /* ACE_HAS_POSIX_REALTIME_SIGNALS */
 125
 126   // The maximum number of concurrent timers per process.
 127 # if !defined (_POSIX_TIMER_MAX)
 128 #   define _POSIX_TIMER_MAX 44
 129 # endif /* _POSIX_TIMER_MAX */
 130
 131 #ifdef __cplusplus
 132 }
 133 #endif /* __cplusplus */
 134
 135 #include /**/ "ace/post.h"
 136 #endif /* ACE_OS_INCLUDE_OS_LIMITS_H */