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Causes the script to sleep for EXPR seconds, or forever if no EXPR.
May be interrupted if the process receives a signal such as C<SIGALRM>.
Returns the number of seconds actually slept.  You probably cannot
mix C<alarm> and C<sleep> calls, because C<sleep> is often implemented
using C<alarm>.
 
On some older systems, it may sleep up to a full second less than what
you requested, depending on how it counts seconds.  Most modern systems
always sleep the full amount.  They may appear to sleep longer than that,
however, because your process might not be scheduled right away in a
busy multitasking system.
 
For delays of finer granularity than one second, you may use Perl's
C<syscall> interface to access setitimer(2) if your system supports
it, or else see L</select> above.  The Time::HiRes module (from CPAN,
and starting from Perl 5.8 part of the standard distribution) may also
help.
 
See also the POSIX module's C<pause> function.
 
=item socket SOCKET,DOMAIN,TYPE,PROTOCOL