70 lines
3.3 KiB
C
70 lines
3.3 KiB
C
|
/* 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 (-32767-1) /* minimum value of a short */
|
||
|
|
#define SHRT_MAX 32767 /* maximum value of a short */
|
||
|
|
#define USHRT_MAX 0xFFFF /* maximum value of unsigned short */
|
||
|
|
|
||
|
|
#if _EM_WSIZE == 4
|
||
|
|
#define INT_MIN (-2147483647-1)
|
||
|
|
#define INT_MAX 2147483647
|
||
|
|
#define UINT_MAX 0xFFFFFFFF
|
||
|
|
#else /* _EM_WSIZE == 2 */
|
||
|
|
/* Definitions about ints (16 bits in MINIX for 8088, 80286, Atari etc) */
|
||
|
|
#define INT_MIN (-32767-1) /* minimum value of an int */
|
||
|
|
#define INT_MAX 32767 /* maximum value of an int */
|
||
|
|
#define UINT_MAX 0xFFFF /* maximum value of an unsigned int */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*Definitions about longs (32 bits in MINIX). */
|
||
|
|
#define LONG_MIN (-2147483647L-1)/* minimum value of a long */
|
||
|
|
#define LONG_MAX 2147483647L /* maximum value of a long */
|
||
|
|
#define ULONG_MAX 0xFFFFFFFFL /* 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 must be atomic */
|
||
|
|
|
||
|
|
/* 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 7168 /* # bytes in atomic write to a pipe */
|
||
|
|
|
||
|
|
#endif /* _POSIX_SOURCE */
|
||
|
|
|
||
|
|
#endif /* _LIMITS_H */
|