limits.h

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/* limits.h */
/* Produced by enquire version 4.3, CWI, Amsterdam */

   /* Number of bits in a storage unit */
#define CHAR_BIT 8
   /* Maximum char */
#define CHAR_MAX 127
   /* Minimum char */
#define CHAR_MIN (-128)
   /* Maximum signed char */
#define SCHAR_MAX 127
   /* Minimum signed char */
#define SCHAR_MIN (-128)
   /* Maximum unsigned char (minimum is always 0) */
#define UCHAR_MAX 255
   /* Maximum short */
#define SHRT_MAX 32767
   /* Minimum short */
#define SHRT_MIN (-32768)
   /* Maximum int */
#define INT_MAX 2147483647
   /* Minimum int */
#define INT_MIN (-2147483647-1)
   /* Maximum long */
#define LONG_MAX 2147483647L
   /* Minimum long */
#define LONG_MIN (-2147483647L-1L)
   /* Maximum unsigned short (minimum is always 0) */
#define USHRT_MAX 65535
   /* Maximum unsigned int (minimum is always 0) */
#define UINT_MAX 4294967295U
   /* Maximum unsigned long (minimum is always 0) */
#define ULONG_MAX 4294967295UL

/* All of these constants can be obtained from sysconf() instead */
#define ARG_MAX         127 /* Max length of arg to exec() */
#define CHILD_MAX       1   /* Max processes per user */
#define CLK_TCK         100 /* Number of clock ticks per second */
#define NGROUPS_MAX     0   /* Max group IDs per process */
#define OPEN_MAX        50  /* Max open files per process */
#define PASS_MAX        8   /* Max bytes in password */
#define _POSIX_STREAM_MAX   8   /* Max open stdio FILEs */
#define TZNAME_MAX      50  /* Max length of timezone name */
/* Not sure why the following should be here, but I guess they are... */
#define BC_BASE_MAX     99  /* Largest ibase and obase for bc */
#define BC_DIM_MAX      2048    /* Max array elements for bc */
#define BC_SCALE_MAX        99  /* Max scale value for bc */
#define COLL_ELEM_MAX       4   /* Max bytes in collation element */
#define EXPR_NEST_MAX       32  /* Max nesting of (...) for expr */
#define LINE_MAX        2048    /* Max length in bytes of input line */
#define PASTE_FILES_MAX     12  /* Max file operands for paste */
#define RE_DUP_MAX      255 /* Max regular expressions permitted */
#define SED_PATTERN_MAX     20480   /* Max size in bytes of sed pattern */
#define SENDTO_MAX      90000   /* Max bytes of message for sendto */
#define SORT_LINE_MAX       20480   /* Max bytes of input line for sort */
/* We use a linked list, so no limit to atexit() funcs */
#define ATEXIT_MAX      INT_MAX /* Max atexit() funcs */

/* All of these constants can be obtained from pathconf() instead */
#define LINK_MAX        1   /* Max links to a single file */
#define MAX_CANON       127 /* Max bytes in TTY canonical input */
#define MAX_INPUT       127 /* Max bytes in TTY input queue */
#define NAME_MAX        12  /* Max bytes in a filename */
#define PATH_MAX        80  /* Max bytes in a pathname */
#define PIPE_BUF        0   /* Max bytes for atomic pipe writes */