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File: libc.info,  Node: Utility Limits,  Next: Utility Minimums,  Prev: Pathconf,  Up: System Configuration

32.10 Utility Program Capacity Limits
=====================================

The POSIX.2 standard specifies certain system limits that you can access
through 'sysconf' that apply to utility behavior rather than the
behavior of the library or the operating system.

   The GNU C Library defines macros for these limits, and 'sysconf'
returns values for them if you ask; but these values convey no
meaningful information.  They are simply the smallest values that
POSIX.2 permits.

 -- Macro: int BC_BASE_MAX
     The largest value of 'obase' that the 'bc' utility is guaranteed to
     support.

 -- Macro: int BC_DIM_MAX
     The largest number of elements in one array that the 'bc' utility
     is guaranteed to support.

 -- Macro: int BC_SCALE_MAX
     The largest value of 'scale' that the 'bc' utility is guaranteed to
     support.

 -- Macro: int BC_STRING_MAX
     The largest number of characters in one string constant that the
     'bc' utility is guaranteed to support.

 -- Macro: int COLL_WEIGHTS_MAX
     The largest number of weights that can necessarily be used in
     defining the collating sequence for a locale.

 -- Macro: int EXPR_NEST_MAX
     The maximum number of expressions that can be nested within
     parenthesis by the 'expr' utility.

 -- Macro: int LINE_MAX
     The largest text line that the text-oriented POSIX.2 utilities can
     support.  (If you are using the GNU versions of these utilities,
     then there is no actual limit except that imposed by the available
     virtual memory, but there is no way that the library can tell you
     this.)

 -- Macro: int EQUIV_CLASS_MAX
     The maximum number of weights that can be assigned to an entry of
     the 'LC_COLLATE' category 'order' keyword in a locale definition.
     The GNU C Library does not presently support locale definitions.


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