dio_read	dio_stat

	Last updated: Mon, 16 Jul 2012

dio_seek

(PHP 4 >= 4.2.0, PECL)

dio_seek -- Seeks to pos on fd from whence

说明

int dio_seek ( resource fd, int pos [, int whence] )

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

参数

fd

The file descriptor returned by dio_open().

pos

The new position.

whence

Specifies how the position pos should be interpreted:

SEEK_SET (default) - specifies that pos is specified from the beginning of the file.
SEEK_CUR - Specifies that pos is a count of characters from the current file position. This count may be positive or negative.
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.

返回值

例

例子 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); ?>

dio_read	dio_stat

	Last updated: Mon, 16 Jul 2012


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