dio_seek(3) [php man page]

DIO_SEEK(3)								 1							       DIO_SEEK(3)

dio_seek - Seeks to pos on fd from whence

SYNOPSIS

       int dio_seek (resource  $fd, int  $pos, [int  $whence = SEEK_SET])

DESCRIPTION

	The function dio_seek(3) is used to change the file position of the given file descriptor.

PARAMETERS

	      o $fd
		- The file descriptor returned by dio_open(3).

	      o $pos
		- The new position.

	      o $whence
		- Specifies how the position $pos should be interpreted:

		     o SEEK_SET (default) - specifies that $pos is specified from the beginning of the file.

		     o SEEK_CUR - Specifies that $pos is a count of characters from the current file position. This count may be positive or nega-
		       tive.

		     o SEEK_END - Specifies that $pos is a count of characters from the end of the file. A negative  count  specifies  a  position
		       within  the current extent of the file; a positive count specifies a position past the current end. If you set the position
		       past the current end, and actually write data, you will extend the file with zeros up to that position.

RETURN VALUES

EXAMPLES

       Example #1

	      Positioning in a file

	      <?php

	      $fd = dio_open('/dev/ttyS0', O_RDWR);

	      dio_seek($fd, 10, SEEK_SET);
	      // position is now at 10 characters from the start of the file

	      dio_seek($fd, -2, SEEK_CUR);
	      // position is now at 8 characters from the start of the file

	      dio_seek($fd, -5, SEEK_END);
	      // position is now at 5 characters from the end of the file

	      dio_seek($fd, 10, SEEK_END);
	      // position is now at 10 characters past the end of the file.
	      // The 10 characters between the end of the file and the current
	      // position are filled with zeros.

	      dio_close($fd);
	      ?>

PHP Documentation Group 													       DIO_SEEK(3)

FSEEK(3)						     Linux Programmer's Manual							  FSEEK(3)

NAME

       fgetpos, fseek, fsetpos, ftell, rewind - reposition a stream

SYNOPSIS

       #include <stdio.h>

       int fseek(FILE *stream, long offset, int whence);
       long ftell(FILE *stream);
       void rewind(FILE *stream);
       int fgetpos(FILE *stream, fpos_t *pos);
       int fsetpos(FILE *stream, fpos_t *pos);

DESCRIPTION

       The  fseek function sets the file position indicator for the stream pointed to by stream.  The new position, measured in bytes, is obtained
       by adding offset bytes to the position specified by whence.  If whence is set to SEEK_SET, SEEK_CUR, or SEEK_END, the offset is relative to
       the  start  of  the file, the current position indicator, or end-of-file, respectively.	A successful call to the fseek function clears the
       end-of-file indicator for the stream and undoes any effects of the ungetc(3) function on the same stream.

       The ftell function obtains the current value of the file position indicator for the stream pointed to by stream.

       The rewind function sets the file position indicator for the stream pointed to by stream to the beginning of the file.	It  is	equivalent
       to:

	      (void)fseek(stream, 0L, SEEK_SET)

       except that the error indicator for the stream is also cleared (see clearerr(3)).

       The fgetpos and fsetpos functions are alternate interfaces equivalent to ftell and fseek (with whence set to SEEK_SET), setting and storing
       the current value of the file offset into or from the object referenced by pos.	On some non-UNIX systems an fpos_t object may be a complex
       object and these routines may be the only way to portably reposition a text stream.

RETURN VALUE

       The  rewind function returns no value.  Upon successful completion, fgetpos, fseek, fsetpos return 0, and ftell returns the current offset.
       Otherwise, -1 is returned and the global variable errno is set to indicate the error.

ERRORS

       EBADF  The stream specified is not a seekable stream.

       EINVAL The whence argument to fseek was not SEEK_SET, SEEK_END, or SEEK_CUR.

       The function fgetpos, fseek, fsetpos, and ftell may also fail and set errno for any of the errors specified  for  the  routines	fflush(3),
       fstat(2), lseek(2), and malloc(3).

CONFORMING TO

       The fgetpos, fsetpos, fseek, ftell, and rewind functions conform to ANSI X3.159-1989 (``ANSI C'').

SEE ALSO

       lseek(2), fseeko(3)

BSD MANPAGE
							    1993-11-29								  FSEEK(3)