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.
9 /* Definitions about chars (8 bits in MINIX, and signed). */
10 #define CHAR_BIT 8 /* # bits in a char */
11 #define CHAR_MIN -128 /* minimum value of a char */
12 #define CHAR_MAX 127 /* maximum value of a char */
13 #define SCHAR_MIN -128 /* minimum value of a signed char */
14 #define SCHAR_MAX 127 /* maximum value of a signed char */
15 #define UCHAR_MAX 255 /* maximum value of an unsigned char */
16 #define MB_LEN_MAX 1 /* maximum length of a multibyte char */
18 /* Definitions about shorts (16 bits in MINIX). */
19 #define SHRT_MIN (-32767-1) /* minimum value of a short */
20 #define SHRT_MAX 32767 /* maximum value of a short */
21 #define USHRT_MAX 0xFFFF /* maximum value of unsigned short */
24 #define INT_MIN (-2147483647-1)
25 #define INT_MAX 2147483647
26 #define UINT_MAX 0xFFFFFFFF
27 #else /* _EM_WSIZE == 2 */
28 /* Definitions about ints (16 bits in MINIX for 8088, 80286, Atari etc) */
29 #define INT_MIN (-32767-1) /* minimum value of an int */
30 #define INT_MAX 32767 /* maximum value of an int */
31 #define UINT_MAX 0xFFFF /* maximum value of an unsigned int */
34 /*Definitions about longs (32 bits in MINIX). */
35 #define LONG_MIN (-2147483647L-1)/* minimum value of a long */
36 #define LONG_MAX 2147483647L /* maximum value of a long */
37 #define ULONG_MAX 0xFFFFFFFFL /* maximum value of an unsigned long */
39 /* Minimum sizes required by the POSIX P1003.1 standard (Table 2-2). */
40 #ifdef _POSIX_SOURCE /* these are only visible for POSIX */
41 #define _POSIX_ARG_MAX 4096 /* exec() may have 4K worth of args */
42 #define _POSIX_CHILD_MAX 6 /* a process may have 6 children */
43 #define _POSIX_LINK_MAX 8 /* a file may have 8 links */
44 #define _POSIX_MAX_CANON 255 /* size of the canonical input queue */
45 #define _POSIX_MAX_INPUT 255 /* you can type 255 chars ahead */
46 #define _POSIX_NAME_MAX 14 /* a file name may have 14 chars */
47 #define _POSIX_NGROUPS_MAX 0 /* supplementary group IDs are optional */
48 #define _POSIX_OPEN_MAX 16 /* a process may have 16 files open */
49 #define _POSIX_PATH_MAX 255 /* a pathname may contain 255 chars */
50 #define _POSIX_PIPE_BUF 512 /* pipes writes of 512 bytes must be atomic */
52 /* Values actually implemented by MINIX (Tables 2-3, 2-4, and 2-5). */
53 /* Some of these old names had better be defined when not POSIX. */
54 #define _NO_LIMIT 100 /* arbitrary number; limit not enforced */
56 #define NGROUPS_MAX 0 /* supplemental group IDs not available */
57 #define ARG_MAX 4096 /* # bytes of args + environ for exec() */
58 #define CHILD_MAX _NO_LIMIT /* MINIX does not limit children */
59 #define OPEN_MAX 20 /* # open files a process may have */
60 #define LINK_MAX 127 /* # links a file may have */
61 #define MAX_CANON 255 /* size of the canonical input queue */
62 #define MAX_INPUT 255 /* size of the type-ahead buffer */
63 #define NAME_MAX 14 /* # chars in a file name */
64 #define PATH_MAX 255 /* # chars in a path name */
65 #define PIPE_BUF 7168 /* # bytes in atomic write to a pipe */
67 #endif /* _POSIX_SOURCE */
69 #endif /* _LIMITS_H */