(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5, PHP 7)
dio_open — Opens a file (creating it if necessary) at a lower level than the C library input/ouput stream functions allow.
$filename
, int $flags
[, int $mode = 0
] )dio_open() opens a file and returns a new file descriptor for it.
filenameThe 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);
?>