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limits(4)
NAME
  limits - Header files for implementation-specific constants

SYNOPSIS
  #include <limits.h>
  #include <float.h>
  #include <sys/limits.h>

DESCRIPTION
  The header file limits.h specifies the sizes of integral types as required
  by the proposed ANSI C standard.  The header file float.h specifies the
  characteristics of floating types as required by the proposed ANSI C
  standard.  The constants that refer to long doubles that should appear in
  float.h are not specified because long doubles are not implemented.  The
  header file sys/limits.h is a list of magnitude limitations imposed by a
  specific implementation of the operating system.  All values in the files
  are specified in decimal.

FILES
  /usr/include/limits.h

  /usr/include/float.h

  /usr/include/sys/syslimits.h