dio_open
Opens a file (creating it if necessary) at a lower level than the
C library input/ouput stream functions allow.
Description
resource dio_open
( string $filename
, int $flags
[, int $mode = 0
] )
Parameters
-
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, causes dio_open to 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 mode and is ignored
otherwise.
The actual permissions assigned to the created file will be
affected by the process's umask setting as
per usual.
Return Values
A file descriptor or FALSE on error.
Examples
Example #1 Opening a file descriptor
<?php
$fd = dio_open('/dev/ttyS0', O_RDWR | O_NOCTTY | O_NONBLOCK);
dio_close($fd);
?>