1 /* The <limits.h> header defines some basic sizes, both of the language types 2 * (e.g., the number of bits in an integer), and of the operating system (e.g. 3 * the number of characters in a file name. 4 */ 5 6 #ifndef _LIMITS_H 7 #define _LIMITS_H 8 9 #include <minix/limits.h> 10 11 /* Definitions about chars (8 bits in MINIX, and signed). */ 12 #define CHAR_BIT 8 /* # bits in a char */ 13 #define CHAR_MIN -128 /* minimum value of a char */ 14 #define CHAR_MAX 127 /* maximum value of a char */ 15 #define SCHAR_MIN -128 /* minimum value of a signed char */ 16 #define SCHAR_MAX 127 /* maximum value of a signed char */ 17 #define UCHAR_MAX 255 /* maximum value of an unsigned char */ 18 #define MB_LEN_MAX 1 /* maximum length of a multibyte char */ 19 20 /* Definitions about shorts (16 bits in MINIX). */ 21 #define SHRT_MIN (-32767-1) /* minimum value of a short */ 22 #define SHRT_MAX 32767 /* maximum value of a short */ 23 #define USHRT_MAX 0xFFFF /* maximum value of unsigned short */ 24 25 /* _EM_WSIZE is a compiler-generated symbol giving the word size in bytes. */ 26 #if _EM_WSIZE == 2 27 #define INT_MIN (-32767-1) /* minimum value of a 16-bit int */ 28 #define INT_MAX 32767 /* maximum value of a 16-bit int */ 29 #define UINT_MAX 0xFFFF /* maximum value of an unsigned 16-bit int */ 30 #endif 31 32 #if _EM_WSIZE == 4 33 #define INT_MIN (-2147483647-1) /* minimum value of a 32-bit int */ 34 #define INT_MAX 2147483647 /* maximum value of a 32-bit int */ 35 #define UINT_MAX 0xFFFFFFFF /* maximum value of an unsigned 32-bit int */ 36 #endif 37 38 /*Definitions about longs (32 bits in MINIX). */ 39 #define LONG_MIN (-2147483647L-1)/* minimum value of a long */ 40 #define LONG_MAX 2147483647L /* maximum value of a long */ 41 #define ULONG_MAX 0xFFFFFFFFL /* maximum value of an unsigned long */ 42 43 /*Definitions about long longs (64 bits, may not be supported). */ 44 #ifdef __LONG_LONG_SUPPORTED 45 #define LLONG_MIN (-0x7FFFFFFFFFFFFFFFLL-1) /* minimum value of a 46 * long long 47 */ 48 #define LLONG_MAX 0x7FFFFFFFFFFFFFFFLL /* maximum value of a 49 * long long 50 */ 51 #define ULLONG_MAX 0xFFFFFFFFFFFFFFFFULL /* maximum value of an 52 * unsigned long long 53 */ 54 #endif 55 56 #include <minix/dir.h> 57 58 /* Minimum sizes required by the POSIX P1003.1 standard (Table 2-3). */ 59 #ifdef _POSIX_SOURCE /* these are only visible for POSIX */ 60 #define _POSIX_ARG_MAX 4096 /* exec() may have 4K worth of args */ 61 #define _POSIX_CHILD_MAX 6 /* a process may have 6 children */ 62 #define _POSIX_LINK_MAX 8 /* a file may have 8 links */ 63 #define _POSIX_MAX_CANON 255 /* size of the canonical input queue */ 64 #define _POSIX_MAX_INPUT 255 /* you can type 255 chars ahead */ 65 #define _POSIX_NAME_MAX DIRSIZ /* max. file name length */ 66 #define _POSIX_NGROUPS_MAX 8 /* max. number of supplemental groups */ 67 68 /* a process may have this many files open */ 69 #define _POSIX_OPEN_MAX __MINIX_OPEN_MAX 70 71 /* a pathname may contain at most this many chars */ 72 #define _POSIX_PATH_MAX __MINIX_PATH_MAX 73 74 #define _POSIX_PIPE_BUF 512 /* pipes writes of 512 bytes must be atomic */ 75 #define _POSIX_STREAM_MAX 8 /* at least 8 FILEs can be open at once */ 76 #define _POSIX_TZNAME_MAX 3 /* time zone names can be at least 3 chars */ 77 #define _POSIX_SSIZE_MAX 32767 /* read() must support 32767 byte reads */ 78 #define _POSIX_SYMLOOP_MAX 8 /* The number of symbolic links that can be 79 * traversed in the resolution of a pathname 80 * in the absence of a loop. 81 */ 82 #define _POSIX_SYMLINK_MAX 255 /* The number of bytes in a symbolic link */ 83 84 /* Values actually implemented by MINIX (Tables 2-4, 2-5, 2-6, and 2-7). */ 85 /* Some of these old names had better be defined when not POSIX. */ 86 #define _NO_LIMIT 100 /* arbitrary number; limit not enforced */ 87 88 #define NGROUPS_MAX 8 /* max. number of supplemental groups */ 89 #if _EM_WSIZE > 2 90 #define ARG_MAX 262144 /* # bytes of args + environ for exec() */ 91 #else 92 #define ARG_MAX 4096 /* args + environ on small machines */ 93 #endif 94 #define CHILD_MAX _NO_LIMIT /* MINIX does not limit children */ 95 #define OPEN_MAX __MINIX_OPEN_MAX /* # open files a process may have */ 96 #if 0 /* V1 file system */ 97 #define LINK_MAX CHAR_MAX /* # links a file may have */ 98 #else /* V2 or better file system */ 99 #define LINK_MAX SHRT_MAX /* # links a file may have */ 100 #endif 101 #define MAX_CANON 255 /* size of the canonical input queue */ 102 #define MAX_INPUT 255 /* size of the type-ahead buffer */ 103 #define NAME_MAX DIRSIZ /* # chars in a file name */ 104 #define PATH_MAX __MINIX_PATH_MAX /* # chars in a path name */ 105 #define PIPE_BUF 7168 /* # bytes in atomic write to a pipe */ 106 #define STREAM_MAX 20 /* must be the same as FOPEN_MAX in stdio.h */ 107 #define TZNAME_MAX 3 /* maximum bytes in a time zone name is 3 */ 108 #define SSIZE_MAX 32767 /* max defined byte count for read() */ 109 #define SIZE_MAX UINT_MAX 110 #define SYMLINK_MAX 1024 /* # bytes in a symbolic link */ 111 #define SYMLOOP_MAX 16 /* maximum number of symbolic links that can 112 * be reliably traversed in the resolution of 113 * a pathname in the absence of a loop. 114 */ 115 #define IOV_MAX INT_MAX /* maximum number of buffers for readv/writev */ 116 #endif /* _POSIX_SOURCE */ 117 118 #endif /* _LIMITS_H */ 119