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=item sysseek FILEHANDLE,POSITION,WHENCE

Sets FILEHANDLE's system position using the system call lseek(2).  It
bypasses stdio, so mixing this with reads (other than C<sysread()>),
C<print()>, C<write()>, C<seek()>, C<tell()>, or C<eof()> may cause
confusion.  FILEHANDLE may be an expression whose value gives the name
of the filehandle.  The values for WHENCE are C<0> to set the new
position to POSITION, C<1> to set the it to the current position plus
POSITION, and C<2> to set it to EOF plus POSITION (typically negative).
For WHENCE, you may use the constants C<SEEK_SET>, C<SEEK_CUR>, and
C<SEEK_END> from either the C<IO::Seekable> or the POSIX module.

Returns the new position, or the undefined value on failure.  A position
of zero is returned as the string "C<0> but true"; thus C<sysseek()> returns
TRUE on success and FALSE on failure, yet you can still easily determine
the new position.

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