(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.
$mode= 0 ] )
dio_open() opens a file and returns a new file descriptor for it.
The pathname of the file to open.
flags parameter is a bitwise-ORed
value comprising flags from the following list. This value
must include one of
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
O_CREAT - creates the file, if it doesn't
O_EXCL - if both
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.
set the permissions of the file (creation
mode is required for
correct operation when
flags and is ignored
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
$fd = dio_open('/dev/ttyS0', O_RDWR | O_NOCTTY | O_NONBLOCK);