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Integers which overflow will automatically upgrade into floats, so all
C<abs>, C<labs>, C<llabs>, C<imaxabs> are implemented by L<perfunc/abs>.
Division via C<div>, C<ldiv>, C<lldiv>, and C<imaxdiv> are also
equivalent.

The following functions where first defined by C99, and describe
the handling of floating-point rounding and exceptions.  They are
not supported:

  feclearexcept, fegetenv, fegetexceptflag, fegetround, feholdexcept,
  feraiseexcept, fesetenv, fesetexceptflag, fesetround, fetestexcept,
  feupdateenv

=head3 Time

The L<POSIX::1003::Time> code provides access to all time functions.
The result depends on the locale setting of the timezone.  See also
L</Timer Interfaces>.

L<Date::Format> contains pure Perl implementations for the other functions
of this section.  Those are fully portable, which cannot always be said

lib/POSIX/Overview.pod  view on Meta::CPAN

  CORE::kill($signal, $pid);
  ::Signals::kill($signal, $pid);
  POSIX::kill($pid, $signal);

=head2 Single Process Interfaces

  confstr                         ::Confstr
  environ     perlvar/%ENV
  errno       perlvar/$ERRNO      $!+0
  getenv      perlvar/%ENV        $ENV{PATH}
  setenv      perlvar/%ENV        $ENV{HOME} = '/tmp'
  sysconf                         ::Sysconf
  uname                           ::OS
  unsetenv    perlvar/%ENV        delete $ENV{PS1}

The error constants are provided by L<Errno|Errno>.

=head2 Symbolic Link Interfaces

  lchown                          ::FS
  lstat       perlfunc
  readlinkat  not supported
  readlink    perlfunc
  symlinkat   not supported