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ARG_MAX    1048320    (** max length of arguments */
        /* to exec */
CHAR_BIT    8    /* max # of bits in a */
        /* "char" */
CHAR_MAX    255    /* max value of a "char" */
CHAR_MIN    0    /* min value of a "char" */
CHILD_MAX    25    /* max # of processes per */
        /* user id */
CLK_TCK    _sysconf(3)    /* clock ticks per second */
DBL_DIG    15    /* digits of precision of */
        /* a "double" */
DBL_MAX    1.7976931348623157E+308    /* max decimal value of */
        /* a "double"*/
DBL_MIN    2.2250738585072014E-308    /* min decimal value of */
        /* a "double"*/
FCHR_MAX    1048576    /* historical default file */
        /* size limit in bytes */
FLT_DIG    6    /* digits of precision of */
        /* a "float" */
FLT_MAX    3.40282347e+38F    /* max decimal value of */
        /* a "float" */
FLT_MIN    1.17549435E-38F    /* min decimal value of */
        /* a "float" */
INT_MAX    2147483647    /* max value of an "int" */
INT_MIN    (-2147483647-1)    /* min value of an "int" */
LINK_MAX    1000    /* max # of links to a */
        /* single file */
LOGNAME_MAX    8    /* max # of characters in */
        /* a login name */
LONG_BIT    32    /* # of bits in */
        /* a "long" */
LONG_MAX    2147483647    /* max value of */
        /* a "long" */
LONG_MIN    (-2147483647-1)    /* min value of */
        /* a "long" */
MAX_CANON    256    /* max bytes in a line for */
        /* canonical processing */
MAX_INPUT    512    /* max size of a char */
        /* input buffer */
MB_LEN_MAX    5    /* max # of bytes in a */
        /* character */
NAME_MAX    14    /* max # of characters in */
        /* a file name */
NGROUPS_MAX    16    /* max # of groups for */
        /* a user */
NL_ARGMAX    9    /* max value of "digit" */
        /* in calls to the NLS */
        /* printf() and scanf() */
NL_LANGMAX    14    /* max # of bytes in a */
        /* LANG name */
NL_MSGMAX    32767    /* max message number */
NL_NMAX    1    /* max # of bytes in */
        /* N-to-1 mapping */
        /* characters */
NL_SETMAX    255    /* max set number */
NL_TEXTMAX    255    /* max # of bytes in a */
        /* message string */
NZERO    20    /* default process */
        /* priority */
OPEN_MAX    20    /* max # of files a */
        /* process can have open */
PASS_MAX    8    /* max # of characters */
        /* in a password */
PATH_MAX    1024    /* max # of characters */
        /* in a path name */
PID_MAX    30000    /* max value for a */
        /* process ID */
PIPE_BUF    5120    /* max # bytes atomic */
        /* in write to a pipe */
PIPE_MAX    5120    /* max # bytes written to */
        /* a pipe in a write */
SCHAR_MAX    127    /* max value of a */
        /* "signed char" */
SCHAR_MIN    (-128)    /* min value of a */
        /* "signed char" */
SHRT_MAX    32767    /* max value of a */
        /* "short int" */
SHRT_MIN    (-32768)    /* min value of a */
        /* "short int" */
STD_BLK    1024    /* # bytes in a physical */
        /* I/O block */
SYS_NMLN    257    /* 4.0 size of utsname */
        /* elements also defined */
        /* in sys/utsname.h */
SYSPID_MAX    1    /* max pid of system */
        /* processes */
TMP_MAX    17576    /* max # of unique names */
        /* generated by tmpnam */
UCHAR_MAX    255    /* max value of an */
        /* "unsigned char" */
UID_MAX    2147483647    /* max value for a user */
        /* or group ID */
UINT_MAX    4294967295    /* max value of an */
        /* "unsigned int" */
ULONG_MAX    4294967295    /* max value of an */
        /* "unsigned long int" */
USHRT_MAX    65535    /* max value of an */
        /* "unsigned short int" */
USI_MAX    4294967295    /* max decimal value of an */
        /* "unsigned" */
WORD_BIT    32    /* # of bits in a */
        /* "word" or "int" */
 

The following POSIX definitions are the most restrictive values to be used by a POSIX conformance application. Conforming implementations shall provide values at least this large.

_POSIX_ARG_MAX    4096    /* max length of arguments to exec */
_POSIX_CHILD_MAX    6    /* max # of processes per user ID */
_POSIX_LINK_MAX    8    /* max # of links to a single file */
_POSIX_MAX_CANON    255    /* max # of bytes in a line of input */
_POSIX_MAX_INPUT    255    /* max # of bytes in terminal */
        /* input queue */
_POSIX_NAME_MAX    14    /* # of bytes in a filename */
_POSIX_NGROUPS_MAX     0    /* max # of groups in a process */
_POSIX_OPEN_MAX    16    /* max # of files a process can */
        /* have open */
_POSIX_PATH_MAX    255    /* max # of characters in a pathname */
_POSIX_PIPE_BUF    512    /* max # of bytes atomic in write */
        /* to a pipe */
 

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