include/limits.h

   1 /* limits.h
   2
   3    Copyright 1999, 2000, 2001 Red Hat, Inc.
   4
   5 This file is part of Cygwin.
   6
   7 This software is a copyrighted work licensed under the terms of the
   8 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
   9 details. */
  10
  11 #ifndef _LIMITS_H___
  12 #ifndef _MACH_MACHLIMITS_H_
  13
  14 /* _MACH_MACHLIMITS_H_ is used on OSF/1.  */
  15 #define _LIMITS_H___
  16 #define _MACH_MACHLIMITS_H_
  17
  18 /* Number of bits in a `char'.  */
  19 #undef CHAR_BIT
  20 #define CHAR_BIT 8
  21
  22 /* Maximum length of a multibyte character.  */
  23 #ifndef MB_LEN_MAX
  24 #define MB_LEN_MAX 8
  25 #endif
  26
  27 /* Minimum and maximum values a `signed char' can hold.  */
  28 #undef SCHAR_MIN
  29 #define SCHAR_MIN (-128)
  30 #undef SCHAR_MAX
  31 #define SCHAR_MAX 127
  32
  33 /* Maximum value an `unsigned char' can hold.  (Minimum is 0).  */
  34 #undef UCHAR_MAX
  35 #define UCHAR_MAX 255
  36
  37 /* Minimum and maximum values a `char' can hold.  */
  38 #ifdef __CHAR_UNSIGNED__
  39 #undef CHAR_MIN
  40 #define CHAR_MIN 0
  41 #undef CHAR_MAX
  42 #define CHAR_MAX 255
  43 #else
  44 #undef CHAR_MIN
  45 #define CHAR_MIN (-128)
  46 #undef CHAR_MAX
  47 #define CHAR_MAX 127
  48 #endif
  49
  50 /* Minimum and maximum values a `signed short int' can hold.  */
  51 #undef SHRT_MIN
  52 #define SHRT_MIN (-32768)
  53 #undef SHRT_MAX
  54 #define SHRT_MAX 32767
  55
  56 /* Maximum value an `unsigned short int' can hold.  (Minimum is 0).  */
  57 #undef USHRT_MAX
  58 #define USHRT_MAX 65535
  59
  60 /* Minimum and maximum values a `signed int' can hold.  */
  61 #ifndef __INT_MAX__
  62 #define __INT_MAX__ 2147483647
  63 #endif
  64 #undef INT_MIN
  65 #define INT_MIN (-INT_MAX-1)
  66 #undef INT_MAX
  67 #define INT_MAX __INT_MAX__
  68
  69 /* Maximum value an `unsigned int' can hold.  (Minimum is 0).  */
  70 #undef UINT_MAX
  71 #define UINT_MAX (INT_MAX * 2U + 1)
  72
  73 /* Minimum and maximum values a `signed long int' can hold.
  74    (Same as `int').  */
  75 #ifndef __LONG_MAX__
  76 #ifndef __alpha__
  77 #define __LONG_MAX__ 2147483647L
  78 #else
  79 #define __LONG_MAX__ 9223372036854775807L
  80 # endif /* __alpha__ */
  81 #endif
  82 #undef LONG_MIN
  83 #define LONG_MIN (-LONG_MAX-1)
  84 #undef LONG_MAX
  85 #define LONG_MAX __LONG_MAX__
  86
  87 /* Maximum value an `unsigned long int' can hold.  (Minimum is 0).  */
  88 #undef ULONG_MAX
  89 #define ULONG_MAX (LONG_MAX * 2UL + 1)
  90
  91 #if defined (__GNU_LIBRARY__) ? defined (__USE_GNU) : !defined (__STRICT_ANSI__)
  92 /* Minimum and maximum values a `signed long long int' can hold.  */
  93 #ifndef __LONG_LONG_MAX__
  94 #define __LONG_LONG_MAX__ 9223372036854775807LL
  95 #endif
  96 #undef LONG_LONG_MIN
  97 #define LONG_LONG_MIN (-LONG_LONG_MAX-1)
  98 #undef LONG_LONG_MAX
  99 #define LONG_LONG_MAX __LONG_LONG_MAX__
 100
 101 /* Maximum value an `unsigned long long int' can hold.  (Minimum is 0).  */
 102 #undef ULONG_LONG_MAX
 103 #define ULONG_LONG_MAX (LONG_LONG_MAX * 2ULL + 1)
 104 #endif
 105
 106 /* Maximum number of iovcnt in a writev */
 107 #undef IOV_MAX
 108 #define IOV_MAX (__INT_MAX__-1)
 109
 110 /* Maximum size of ssize_t */
 111 #undef SSIZE_MAX
 112 #define SSIZE_MAX (__LONG_MAX__)
 113
 114 /* Maximum length of a path */
 115 #define PATH_MAX (260 - 1 /*NUL*/)
 116
 117 /* Max num groups for a user, value taken from NT documentation */
 118 /* Must match <sys/param.h> NGROUPS */
 119 #define NGROUPS_MAX 16
 120
 121 /* WaitForMultipleObjects can't handle waiting for more than 64 objects.
 122    This limits how many children we can fork/spawn off. */
 123 #define CHILD_MAX 63
 124
 125 /* # of open files per process. Actually it can be more since Cygwin
 126    grows the dtable as necessary. We define a reasonable limit here
 127    which is returned by getdtablesize(), sysconf(_SC_OPEN_MAX) and
 128    getrlimit(RLIMIT_NOFILE). */
 129 #undef OPEN_MAX
 130 #define OPEN_MAX 256
 131
 132 /* # of bytes in a pipe buf. This is the max # of bytes which can be
 133    written to a pipe in one atomic operation. */
 134 #undef PIPE_BUF
 135 #define PIPE_BUF 4096
 136
 137 /* POSIX values */
 138 /* These should never vary from one system type to another */
 139 /* They represent the minimum values that POSIX systems must support.
 140    POSIX-conforming apps must not require larger values. */
 141 #define _POSIX_ARG_MAX          4096
 142 #define _POSIX_CHILD_MAX        6
 143 #define _POSIX_LINK_MAX         8
 144 #define _POSIX_MAX_CANON        255
 145 #define _POSIX_MAX_INPUT        255
 146 #define _POSIX_NAME_MAX         14
 147 #define _POSIX_NGROUPS_MAX      0
 148 #define _POSIX_OPEN_MAX         16
 149 #define _POSIX_PATH_MAX         255
 150 #define _POSIX_PIPE_BUF         512
 151 #define _POSIX_SSIZE_MAX        32767
 152 #define _POSIX_STREAM_MAX       8
 153 #define _POSIX_TZNAME_MAX       3
 154
 155 #endif /* _MACH_MACHLIMITS_H_ */
 156 #endif /* _LIMITS_H___ */