| [4] | 1 | /* The <limits.h> header defines some basic sizes, both of the language types
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| 2 | * (e.g., the number of bits in an integer), and of the operating system (e.g.
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| 3 | * the number of characters in a file name.
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| 4 | */
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| 5 |
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| 6 | #ifndef _LIMITS_H
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| 7 | #define _LIMITS_H
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| 8 |
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| 9 | /* Definitions about chars (8 bits in MINIX, and signed). */
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| 10 | #define CHAR_BIT 8 /* # bits in a char */
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| 11 | #define CHAR_MIN -128 /* minimum value of a char */
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| 12 | #define CHAR_MAX 127 /* maximum value of a char */
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| 13 | #define SCHAR_MIN -128 /* minimum value of a signed char */
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| 14 | #define SCHAR_MAX 127 /* maximum value of a signed char */
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| 15 | #define UCHAR_MAX 255 /* maximum value of an unsigned char */
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| 16 | #define MB_LEN_MAX 1 /* maximum length of a multibyte char */
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| 17 |
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| 18 | /* Definitions about shorts (16 bits in MINIX). */
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| 19 | #define SHRT_MIN (-32767-1) /* minimum value of a short */
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| 20 | #define SHRT_MAX 32767 /* maximum value of a short */
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| 21 | #define USHRT_MAX 0xFFFF /* maximum value of unsigned short */
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| 22 |
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| 23 | /* _EM_WSIZE is a compiler-generated symbol giving the word size in bytes. */
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| 24 | #define INT_MIN (-2147483647-1) /* minimum value of a 32-bit int */
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| 25 | #define INT_MAX 2147483647 /* maximum value of a 32-bit int */
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| 26 | #define UINT_MAX 0xFFFFFFFF /* maximum value of an unsigned 32-bit int */
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| 27 |
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| 28 | /*Definitions about longs (32 bits in MINIX). */
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| 29 | #define LONG_MIN (-2147483647L-1)/* minimum value of a long */
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| 30 | #define LONG_MAX 2147483647L /* maximum value of a long */
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| 31 | #define ULONG_MAX 0xFFFFFFFFL /* maximum value of an unsigned long */
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| 32 |
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| 33 | #include <sys/dir.h>
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| 34 |
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| 35 | /* Minimum sizes required by the POSIX P1003.1 standard (Table 2-3). */
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| 36 | #ifdef _POSIX_SOURCE /* these are only visible for POSIX */
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| 37 | #define _POSIX_ARG_MAX 4096 /* exec() may have 4K worth of args */
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| 38 | #define _POSIX_CHILD_MAX 6 /* a process may have 6 children */
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| 39 | #define _POSIX_LINK_MAX 8 /* a file may have 8 links */
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| 40 | #define _POSIX_MAX_CANON 255 /* size of the canonical input queue */
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| 41 | #define _POSIX_MAX_INPUT 255 /* you can type 255 chars ahead */
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| 42 | #define _POSIX_NAME_MAX DIRSIZ /* a file name may have 14 chars */
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| 43 | #define _POSIX_NGROUPS_MAX 0 /* supplementary group IDs are optional */
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| 44 | #define _POSIX_OPEN_MAX 16 /* a process may have 16 files open */
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| 45 | #define _POSIX_PATH_MAX 255 /* a pathname may contain 255 chars */
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| 46 | #define _POSIX_PIPE_BUF 512 /* pipes writes of 512 bytes must be atomic */
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| 47 | #define _POSIX_STREAM_MAX 8 /* at least 8 FILEs can be open at once */
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| 48 | #define _POSIX_TZNAME_MAX 3 /* time zone names can be at least 3 chars */
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| 49 | #define _POSIX_SSIZE_MAX 32767 /* read() must support 32767 byte reads */
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| 50 |
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| 51 | /* Values actually implemented by MINIX (Tables 2-4, 2-5, 2-6, and 2-7). */
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| 52 | /* Some of these old names had better be defined when not POSIX. */
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| 53 | #define _NO_LIMIT 100 /* arbitrary number; limit not enforced */
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| 54 |
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| 55 | #define NGROUPS_MAX 0 /* supplemental group IDs not available */
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| 56 | #define ARG_MAX 16384 /* # bytes of args + environ for exec() */
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| 57 | #define CHILD_MAX _NO_LIMIT /* MINIX does not limit children */
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| 58 | #define OPEN_MAX 20 /* # open files a process may have */
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| 59 | #define LINK_MAX SHRT_MAX /* # links a file may have */
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| 60 | #define MAX_CANON 255 /* size of the canonical input queue */
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| 61 | #define MAX_INPUT 255 /* size of the type-ahead buffer */
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| 62 | #define NAME_MAX DIRSIZ /* # chars in a file name */
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| 63 | #define PATH_MAX 255 /* # chars in a path name */
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| 64 | #define PIPE_BUF 7168 /* # bytes in atomic write to a pipe */
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| 65 | #define STREAM_MAX 20 /* must be the same as FOPEN_MAX in stdio.h */
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| 66 | #define TZNAME_MAX 3 /* maximum bytes in a time zone name is 3 */
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| 67 | #define SSIZE_MAX 32767 /* max defined byte count for read() */
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| 68 |
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| 69 | #endif /* _POSIX_SOURCE */
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| 70 |
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| 71 | #endif /* _LIMITS_H */
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