GNU.WIKI: The GNU/Linux Knowledge Base

  [HOME] [PHP Manual] [HowTo] [ABS] [MAN1] [MAN2] [MAN3] [MAN4] [MAN5] [MAN6] [MAN7] [MAN8] [MAN9]

  [0-9] [Aa] [Bb] [Cc] [Dd] [Ee] [Ff] [Gg] [Hh] [Ii] [Jj] [Kk] [Ll] [Mm] [Nn] [Oo] [Pp] [Qq] [Rr] [Ss] [Tt] [Uu] [Vv] [Ww] [Xx] [Yy] [Zz]


       IO::Seekable - supply seek based methods for I/O objects


           use IO::Seekable;
           package IO::Something;
           @ISA = qw(IO::Seekable);


       "IO::Seekable" does not have a constructor of its own as it is intended
       to be inherited by other "IO::Handle" based objects. It provides
       methods which allow seeking of the file descriptors.

           Returns an opaque value that represents the current position of the
           IO::File, or "undef" if this is not possible (eg an unseekable
           stream such as a terminal, pipe or socket). If the fgetpos()
           function is available in your C library it is used to implements
           getpos, else perl emulates getpos using C's ftell() function.

           Uses the value of a previous getpos call to return to a previously
           visited position. Returns "0 but true" on success, "undef" on

       See perlfunc for complete descriptions of each of the following
       supported "IO::Seekable" methods, which are just front ends for the
       corresponding built-in functions:

       $io->seek ( POS, WHENCE )
           Seek the IO::File to position POS, relative to WHENCE:

           WHENCE=0 (SEEK_SET)
                   POS is absolute position. (Seek relative to the start of
                   the file)

           WHENCE=1 (SEEK_CUR)
                   POS is an offset from the current position. (Seek relative
                   to current)

           WHENCE=2 (SEEK_END)
                   POS is an offset from the end of the file. (Seek relative
                   to end)

           The SEEK_* constants can be imported from the "Fcntl" module if you
           don't wish to use the numbers 0 1 or 2 in your code.

           Returns 1 upon success, 0 otherwise.

       $io->sysseek( POS, WHENCE )
           Similar to $io->seek, but sets the IO::File's position using the
           system call lseek(2) directly, so will confuse most perl IO
           operators except sysread and syswrite (see perlfunc for full

           Returns the new position, or "undef" on failure.  A position of
           zero is returned as the string "0 but true"

           Returns the IO::File's current position, or -1 on error.


       perlfunc, "I/O Operators" in perlop, IO::Handle IO::File


       Derived from by Graham Barr <>

  All copyrights belong to their respective owners. Other content (c) 2014-2018, GNU.WIKI. Please report site errors to
Page load time: 0.086 seconds. Last modified: November 04 2018 12:49:43.