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PHP : Function Reference : Direct IO Functions : dio_fcntl

dio_fcntl

Performs a c library fcntl on fd (PHP 4 >= 4.2.0, PHP 5 <= 5.0.5)
mixed dio_fcntl ( resource fd, int cmd [, mixed args] )

Example 499. Setting and clearing a lock

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<?php


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


if (dio_fcntl($fd, F_SETLK, Array("type"=>F_WRLCK)) == -1) {

   // the file descriptor appears locked

   echo "The lock can not be cleared. It is held by someone else.";

} else {

   echo "Lock succesfully set/cleared";

}

dio_close($fd);
?>

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dio_close
dio_fcntl
dio_open
dio_read
dio_seek
dio_stat
dio_tcsetattr
dio_truncate
dio_write

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