(PHP 4 >= 4.2.0, PHP 5 < 5.1.0)
dio_open — Opens a file (creating it if necessary) at a lower level than the C library input/ouput stream functions allow
dio_open ( string $filename , int $flags [, int $mode = 0 ] ) : resource
dio_open() opens a file and returns a new file descriptor for it.
filename
The pathname of the file to open.
flags
The flags
parameter is a bitwise-ORed value comprising flags from the following list. This value must include one of O_RDONLY
, O_WRONLY
, or O_RDWR
. Additionally, it may include any combination of the other flags from this list.
O_RDONLY
- opens the file for read access.
O_WRONLY
- opens the file for write access.
O_RDWR
- opens the file for both reading and writing.
O_CREAT
- creates the file, if it doesn't already exist.
O_EXCL
- if both O_CREAT
and O_EXCL
are set and the file already exists, dio_open() will fail.
O_TRUNC
- if the file exists and is opened for write access, the file will be truncated to zero length.
O_APPEND
- write operations write data at the end of the file.
O_NONBLOCK
- sets non blocking mode.
O_NOCTTY
- prevent the OS from assigning the opened file as the process's controlling terminal when opening a TTY device file.
mode
If flags
contains O_CREAT
, mode
will set the permissions of the file (creation permissions). mode
is required for correct operation when O_CREAT
is specified in flags
and is ignored otherwise.
The actual permissions assigned to the created file will be affected by the process's umask setting as per usual.
A file descriptor or false
on error.
Example #1 Opening a file descriptor
<?php $fd = dio_open('/dev/ttyS0', O_RDWR | O_NOCTTY | O_NONBLOCK); dio_close($fd); ?>
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https://www.php.net/manual/en/function.dio-open.php