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The following will set the LC_COLLATE behaviour to Argentinian
Spanish. B<NOTE>: The naming and availability of locales depends on
your operating system. Please consult L<perllocale> for how to find
out which locales are available in your system.

	$loc = setlocale( LC_ALL, "es_AR.ISO8859-1" );

=item setpgid

This is similar to the C function C<setpgid()> for
setting the process group identifier of the current process.

Returns C<undef> on failure.

=item setsid

This is identical to the C function C<setsid()> for
setting the session identifier of the current process.

=item setuid

Sets the real user identifier and the effective user identifier for
this process.  Similar to assigning a value to the Perl's builtin
C<$E<lt>> variable, see L<perlvar/$UID>, except that the latter
will change only the real user identifier.

=item sigaction

Detailed signal management.  This uses C<POSIX::SigAction> objects for the
C<action> and C<oldaction> arguments.  Consult your system's C<sigaction>
manpage for details.

Synopsis:

	sigaction(signal, action, oldaction = 0)

Returns C<undef> on failure.  The C<signal> must be a number (like
SIGHUP), not a string (like "SIGHUP"), though Perl does try hard
to understand you.

=item siglongjmp

siglongjmp() is C-specific: use L<perlfunc/die> instead.

=item sigpending

Examine signals that are blocked and pending.  This uses C<POSIX::SigSet>
objects for the C<sigset> argument.  Consult your system's C<sigpending>
manpage for details.

Synopsis:

	sigpending(sigset)

Returns C<undef> on failure.

=item sigprocmask

Change and/or examine calling process's signal mask.  This uses
C<POSIX::SigSet> objects for the C<sigset> and C<oldsigset> arguments.
Consult your system's C<sigprocmask> manpage for details.

Synopsis:

	sigprocmask(how, sigset, oldsigset = 0)

Returns C<undef> on failure.

=item sigsetjmp

C<sigsetjmp()> is C-specific: use C<eval {}> instead,
see L<perlfunc/eval>.

=item sigsuspend

Install a signal mask and suspend process until signal arrives.  This uses
C<POSIX::SigSet> objects for the C<signal_mask> argument.  Consult your
system's C<sigsuspend> manpage for details.

Synopsis:

	sigsuspend(signal_mask)

Returns C<undef> on failure.

=item sin

This is identical to Perl's builtin C<sin()> function
for returning the sine of the numerical argument,
see L<perlfunc/sin>.  See also L<Math::Trig>.

=item sinh

This is identical to the C function C<sinh()>
for returning the hyperbolic sine of the numerical argument.
See also L<Math::Trig>.

=item sleep

This is functionally identical to Perl's builtin C<sleep()> function
for suspending the execution of the current for process for certain
number of seconds, see L<perlfunc/sleep>.  There is one signifanct 
difference, however: C<POSIX::sleep()> returns the number of
B<unslept> seconds, while the C<CORE::sleep()> returns the
number of slept seconds.

=item sprintf

This is similar to Perl's builtin C<sprintf()> function
for returning a string that has the arguments formatted as requested,
see L<perlfunc/sprintf>.

=item sqrt

This is identical to Perl's builtin C<sqrt()> function.
for returning the square root of the numerical argument,
see L<perlfunc/sqrt>.

=item srand

Give a seed the pseudorandom number generator, see L<perlfunc/srand>.

=item sscanf

sscanf() is C-specific, use regular expressions instead,