69 lines
3.3 KiB
C
69 lines
3.3 KiB
C
/* The <limits.h> header defines some basic sizes, both of the language types
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* (e.g., the number of bits in an integer), and of the operating system (e.g.
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* the number of characters in a file name.
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*/
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#ifndef _LIMITS_H
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#define _LIMITS_H
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/* Definitions about chars (8 bits in MINIX, and signed). */
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#define CHAR_BIT 8 /* # bits in a char */
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#define CHAR_MIN -128 /* minimum value of a char */
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#define CHAR_MAX 127 /* maximum value of a char */
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#define SCHAR_MIN -128 /* minimum value of a signed char */
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#define SCHAR_MAX 127 /* maximum value of a signed char */
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#define UCHAR_MAX 255 /* maximum value of an unsigned char */
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#define MB_LEN_MAX 1 /* maximum length of a multibyte char */
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/* Definitions about shorts (16 bits in MINIX). */
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#define SHRT_MIN (-32767-1) /* minimum value of a short */
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#define SHRT_MAX 32767 /* maximum value of a short */
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#define USHRT_MAX 0xFFFF /* maximum value of unsigned short */
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#if _EM_WSIZE == 4
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#define INT_MIN (-2147483647-1)
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#define INT_MAX 2147483647
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#define UINT_MAX 0xFFFFFFFF
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#else /* _EM_WSIZE == 2 */
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/* Definitions about ints (16 bits in MINIX for 8088, 80286, Atari etc) */
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#define INT_MIN (-32767-1) /* minimum value of an int */
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#define INT_MAX 32767 /* maximum value of an int */
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#define UINT_MAX 0xFFFF /* maximum value of an unsigned int */
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#endif
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/*Definitions about longs (32 bits in MINIX). */
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#define LONG_MIN (-2147483647L-1)/* minimum value of a long */
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#define LONG_MAX 2147483647L /* maximum value of a long */
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#define ULONG_MAX 0xFFFFFFFFL /* maximum value of an unsigned long */
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/* Minimum sizes required by the POSIX P1003.1 standard (Table 2-2). */
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#ifdef _POSIX_SOURCE /* these are only visible for POSIX */
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#define _POSIX_ARG_MAX 4096 /* exec() may have 4K worth of args */
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#define _POSIX_CHILD_MAX 6 /* a process may have 6 children */
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#define _POSIX_LINK_MAX 8 /* a file may have 8 links */
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#define _POSIX_MAX_CANON 255 /* size of the canonical input queue */
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#define _POSIX_MAX_INPUT 255 /* you can type 255 chars ahead */
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#define _POSIX_NAME_MAX 14 /* a file name may have 14 chars */
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#define _POSIX_NGROUPS_MAX 0 /* supplementary group IDs are optional */
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#define _POSIX_OPEN_MAX 16 /* a process may have 16 files open */
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#define _POSIX_PATH_MAX 255 /* a pathname may contain 255 chars */
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#define _POSIX_PIPE_BUF 512 /* pipes writes of 512 bytes must be atomic */
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/* Values actually implemented by MINIX (Tables 2-3, 2-4, and 2-5). */
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/* Some of these old names had better be defined when not POSIX. */
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#define _NO_LIMIT 100 /* arbitrary number; limit not enforced */
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#define NGROUPS_MAX 0 /* supplemental group IDs not available */
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#define ARG_MAX 4096 /* # bytes of args + environ for exec() */
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#define CHILD_MAX _NO_LIMIT /* MINIX does not limit children */
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#define OPEN_MAX 20 /* # open files a process may have */
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#define LINK_MAX 127 /* # links a file may have */
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#define MAX_CANON 255 /* size of the canonical input queue */
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#define MAX_INPUT 255 /* size of the type-ahead buffer */
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#define NAME_MAX 14 /* # chars in a file name */
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#define PATH_MAX 255 /* # chars in a path name */
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#define PIPE_BUF 7168 /* # bytes in atomic write to a pipe */
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#endif /* _POSIX_SOURCE */
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#endif /* _LIMITS_H */
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