home *** CD-ROM | disk | FTP | other *** search
- /* The <limits.h> header defines some basic sizes, both of the language types
- * (e.g., the number of bits in an integer), and of the operating system (e.g.
- * the number of characters in a file name.
- */
-
- #ifndef _LIMITS_H
- #define _LIMITS_H
-
- /* Definitions about chars (8 bits in MINIX, and signed). */
- #define CHAR_BIT 8 /* # bits in a char */
- #define CHAR_MIN -128 /* minimum value of a char */
- #define CHAR_MAX 127 /* maximum value of a char */
- #define SCHAR_MIN -128 /* minimum value of a signed char */
- #define SCHAR_MAX 127 /* maximum value of a signed char */
- #define UCHAR_MAX 255 /* maximum value of an unsigned char */
- #define MB_LEN_MAX 1 /* maximum length of a multibyte char */
-
- /* Definitions about shorts (16 bits in MINIX). */
- #define SHRT_MIN -32768 /* minimum value of a short */
- #define SHRT_MAX 32767 /* maximum value of a short */
- #define USHRT_MAX 65535 /* maximum value of unsigned short */
-
- /* Definitions about ints (16 bits in MINIX for 8088, 80286, Atari etc) */
- #define INT_MIN -32768 /* minimum value of an int */
- #define INT_MAX 32767 /* maximum value of an int */
- #define UINT_MAX 65535 /* maximum value of an unsigned int */
-
- /*Definitions about longs (32 bits in MINIX). */
- #define LONG_MIN -2147483648 /* minimum value of a long */
- #define LONG_MAX 2147483647 /* maximum value of a long */
- #define ULONG_MAX 4294967295 /* maximum value of an unsigned long */
-
- /* Minimum sizes required by the POSIX P1003.1 standard (Table 2-2). */
- #ifdef _POSIX_SOURCE /* these are only visible for POSIX */
- #define _POSIX_ARG_MAX 4096 /* exec() may have 4K worth of args */
- #define _POSIX_CHILD_MAX 6 /* a process may have 6 children */
- #define _POSIX_LINK_MAX 8 /* a file may have 8 links */
- #define _POSIX_MAX_CANON 255 /* size of the canonical input queue */
- #define _POSIX_MAX_INPUT 255 /* you can type 255 chars ahead */
- #define _POSIX_NAME_MAX 14 /* a file name may have 14 chars */
- #define _POSIX_NGROUPS_MAX 0 /* supplementary group IDs are optional */
- #define _POSIX_OPEN_MAX 16 /* a process may have 16 files open */
- #define _POSIX_PATH_MAX 255 /* a pathname may contain 255 chars */
- #define _POSIX_PIPE_BUF 512 /* pipes writes of 512 bytes are atomic */
-
- #endif /* _POSIX_SOURCE */
-
- /* Values actually implemented by MINIX (Tables 2-3, 2-4, and 2-5). */
- /* Some of these old names had better be defined when not POSIX. */
- #define _NO_LIMIT 100 /* arbitrary number; limit not enforced */
-
- #define NGROUPS_MAX 0 /* supplemental group IDs not available */
- #define ARG_MAX 4096 /* # bytes of args + environ for exec() */
- #define CHILD_MAX _NO_LIMIT /* MINIX does not limit children */
- #define OPEN_MAX 20 /* # open files a process may have */
- #define LINK_MAX 127 /* # links a file may have */
- #define MAX_CANON 255 /* size of the canonical input queue */
- #define MAX_INPUT 255 /* size of the type-ahead buffer */
- #define NAME_MAX 14 /* # chars in a file name */
- #define PATH_MAX 255 /* # chars in a path name */
- #define PIPE_BUF 512 /* # bytes in atomic write to a pipe */
-
- #endif /* _LIMITS_H */
-